/*- * Copyright (c) 2011 Michihiro NAKAJIMA * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "archive_platform.h" __FBSDID("$FreeBSD$"); #ifdef HAVE_ERRNO_H #include #endif #ifdef HAVE_STDLIB_H #include #endif #ifdef HAVE_BZLIB_H #include #endif #ifdef HAVE_LZMA_H #include #endif #ifdef HAVE_ZLIB_H #include #endif #include "archive.h" #include "archive_entry.h" #include "archive_entry_locale.h" #include "archive_ppmd7_private.h" #include "archive_private.h" #include "archive_read_private.h" #include "archive_endian.h" #ifndef HAVE_ZLIB_H #include "archive_crc32.h" #endif #define _7ZIP_SIGNATURE "7z\xBC\xAF\x27\x1C" #define SFX_MIN_ADDR 0x27000 #define SFX_MAX_ADDR 0x60000 /* * Codec ID */ #define _7Z_COPY 0 #define _7Z_LZMA 0x030101 #define _7Z_LZMA2 0x21 #define _7Z_DEFLATE 0x040108 #define _7Z_BZ2 0x040202 #define _7Z_PPMD 0x030401 #define _7Z_DELTA 0x03 #define _7Z_CRYPTO_MAIN_ZIP 0x06F10101 /* Main Zip crypto algo */ #define _7Z_CRYPTO_RAR_29 0x06F10303 /* Rar29 AES-128 + (modified SHA-1) */ #define _7Z_CRYPTO_AES_256_SHA_256 0x06F10701 /* AES-256 + SHA-256 */ #define _7Z_X86 0x03030103 #define _7Z_X86_BCJ2 0x0303011B #define _7Z_POWERPC 0x03030205 #define _7Z_IA64 0x03030401 #define _7Z_ARM 0x03030501 #define _7Z_ARMTHUMB 0x03030701 #define _7Z_SPARC 0x03030805 /* * 7-Zip header property IDs. */ #define kEnd 0x00 #define kHeader 0x01 #define kArchiveProperties 0x02 #define kAdditionalStreamsInfo 0x03 #define kMainStreamsInfo 0x04 #define kFilesInfo 0x05 #define kPackInfo 0x06 #define kUnPackInfo 0x07 #define kSubStreamsInfo 0x08 #define kSize 0x09 #define kCRC 0x0A #define kFolder 0x0B #define kCodersUnPackSize 0x0C #define kNumUnPackStream 0x0D #define kEmptyStream 0x0E #define kEmptyFile 0x0F #define kAnti 0x10 #define kName 0x11 #define kCTime 0x12 #define kATime 0x13 #define kMTime 0x14 #define kAttributes 0x15 #define kEncodedHeader 0x17 #define kDummy 0x19 struct _7z_digests { unsigned char *defineds; uint32_t *digests; }; struct _7z_folder { uint64_t numCoders; struct _7z_coder { unsigned long codec; uint64_t numInStreams; uint64_t numOutStreams; uint64_t propertiesSize; unsigned char *properties; } *coders; uint64_t numBindPairs; struct { uint64_t inIndex; uint64_t outIndex; } *bindPairs; uint64_t numPackedStreams; uint64_t *packedStreams; uint64_t numInStreams; uint64_t numOutStreams; uint64_t *unPackSize; unsigned char digest_defined; uint32_t digest; uint64_t numUnpackStreams; uint32_t packIndex; /* Unoperated bytes. */ uint64_t skipped_bytes; }; struct _7z_coders_info { uint64_t numFolders; struct _7z_folder *folders; uint64_t dataStreamIndex; }; struct _7z_pack_info { uint64_t pos; uint64_t numPackStreams; uint64_t *sizes; struct _7z_digests digest; /* Calculated from pos and numPackStreams. */ uint64_t *positions; }; struct _7z_substream_info { size_t unpack_streams; uint64_t *unpackSizes; unsigned char *digestsDefined; uint32_t *digests; }; struct _7z_stream_info { struct _7z_pack_info pi; struct _7z_coders_info ci; struct _7z_substream_info ss; }; struct _7z_header_info { uint64_t dataIndex; unsigned char *emptyStreamBools; unsigned char *emptyFileBools; unsigned char *antiBools; unsigned char *attrBools; }; struct _7zip_entry { size_t name_len; unsigned char *utf16name; #if defined(_WIN32) && !defined(__CYGWIN__) && defined(_DEBUG) const wchar_t *wname; #endif uint32_t folderIndex; uint32_t ssIndex; unsigned flg; #define MTIME_IS_SET (1<<0) #define ATIME_IS_SET (1<<1) #define CTIME_IS_SET (1<<2) #define CRC32_IS_SET (1<<3) #define HAS_STREAM (1<<4) time_t mtime; time_t atime; time_t ctime; long mtime_ns; long atime_ns; long ctime_ns; uint32_t mode; uint32_t attr; }; struct _7zip { /* Structural information about the archive. */ struct _7z_stream_info si; int header_is_being_read; int header_is_encoded; uint64_t header_bytes_remaining; unsigned long header_crc32; /* Header offset to check that reading points of the file contents * will not exceed the header. */ uint64_t header_offset; /* Base offset of the archive file for a seek in case reading SFX. */ uint64_t seek_base; /* List of entries */ size_t entries_remaining; uint64_t numFiles; struct _7zip_entry *entries; struct _7zip_entry *entry; unsigned char *entry_names; /* entry_bytes_remaining is the number of bytes we expect. */ int64_t entry_offset; uint64_t entry_bytes_remaining; /* Running CRC32 of the decompressed data */ unsigned long entry_crc32; /* Flags to mark progress of decompression. */ char end_of_entry; /* Uncompressed buffer control. */ #define UBUFF_SIZE (64 * 1024) unsigned char *uncompressed_buffer; unsigned char *uncompressed_buffer_pointer; size_t uncompressed_buffer_size; size_t uncompressed_buffer_bytes_remaining; /* Offset of the compressed data. */ int64_t stream_offset; /* * Decompressing control data. */ unsigned folder_index; uint64_t folder_outbytes_remaining; unsigned pack_stream_index; unsigned pack_stream_remaining; uint64_t pack_stream_inbytes_remaining; size_t pack_stream_bytes_unconsumed; /* The codec information of a folder. */ unsigned long codec; unsigned long codec2; /* * Decompressor controllers. */ /* Decoding LZMA1 and LZMA2 data. */ #ifdef HAVE_LZMA_H lzma_stream lzstream; int lzstream_valid; #endif /* Decoding bzip2 data. */ #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR) bz_stream bzstream; int bzstream_valid; #endif /* Decoding deflate data. */ #ifdef HAVE_ZLIB_H z_stream stream; int stream_valid; #endif /* Decoding PPMd data. */ int ppmd7_stat; CPpmd7 ppmd7_context; CPpmd7z_RangeDec range_dec; IByteIn bytein; struct { const unsigned char *next_in; int64_t avail_in; int64_t total_in; unsigned char *next_out; int64_t avail_out; int64_t total_out; int overconsumed; } ppstream; int ppmd7_valid; /* Decoding BCJ and BCJ2 data. */ uint32_t bcj_state; size_t odd_bcj_size; unsigned char odd_bcj[4]; /* Decoding BCJ data. */ size_t bcj_prevPosT; uint32_t bcj_prevMask; uint32_t bcj_ip; /* Decoding BCJ2 data. */ size_t main_stream_bytes_remaining; unsigned char *sub_stream_buff[3]; size_t sub_stream_size[3]; size_t sub_stream_bytes_remaining[3]; unsigned char *tmp_stream_buff; size_t tmp_stream_buff_size; size_t tmp_stream_bytes_avail; size_t tmp_stream_bytes_remaining; #ifdef _LZMA_PROB32 #define CProb uint32_t #else #define CProb uint16_t #endif CProb bcj2_p[256 + 2]; uint8_t bcj2_prevByte; uint32_t bcj2_range; uint32_t bcj2_code; uint64_t bcj2_outPos; /* Filename character-set conversion data. */ struct archive_string_conv *sconv; char format_name[64]; /* Custom value that is non-zero if this archive contains encrypted entries. */ int has_encrypted_entries; }; /* Maximum entry size. This limitation prevents reading intentional * corrupted 7-zip files on assuming there are not so many entries in * the files. */ #define UMAX_ENTRY ARCHIVE_LITERAL_ULL(100000000) static int archive_read_format_7zip_has_encrypted_entries(struct archive_read *); static int archive_read_support_format_7zip_capabilities(struct archive_read *a); static int archive_read_format_7zip_bid(struct archive_read *, int); static int archive_read_format_7zip_cleanup(struct archive_read *); static int archive_read_format_7zip_read_data(struct archive_read *, const void **, size_t *, int64_t *); static int archive_read_format_7zip_read_data_skip(struct archive_read *); static int archive_read_format_7zip_read_header(struct archive_read *, struct archive_entry *); static int check_7zip_header_in_sfx(const char *); static unsigned long decode_codec_id(const unsigned char *, size_t); static int decode_encoded_header_info(struct archive_read *, struct _7z_stream_info *); static int decompress(struct archive_read *, struct _7zip *, void *, size_t *, const void *, size_t *); static ssize_t extract_pack_stream(struct archive_read *, size_t); static void fileTimeToUtc(uint64_t, time_t *, long *); static uint64_t folder_uncompressed_size(struct _7z_folder *); static void free_CodersInfo(struct _7z_coders_info *); static void free_Digest(struct _7z_digests *); static void free_Folder(struct _7z_folder *); static void free_Header(struct _7z_header_info *); static void free_PackInfo(struct _7z_pack_info *); static void free_StreamsInfo(struct _7z_stream_info *); static void free_SubStreamsInfo(struct _7z_substream_info *); static int free_decompression(struct archive_read *, struct _7zip *); static ssize_t get_uncompressed_data(struct archive_read *, const void **, size_t, size_t); static const unsigned char * header_bytes(struct archive_read *, size_t); static int init_decompression(struct archive_read *, struct _7zip *, const struct _7z_coder *, const struct _7z_coder *); static int parse_7zip_uint64(struct archive_read *, uint64_t *); static int read_Bools(struct archive_read *, unsigned char *, size_t); static int read_CodersInfo(struct archive_read *, struct _7z_coders_info *); static int read_Digests(struct archive_read *, struct _7z_digests *, size_t); static int read_Folder(struct archive_read *, struct _7z_folder *); static int read_Header(struct archive_read *, struct _7z_header_info *, int); static int read_PackInfo(struct archive_read *, struct _7z_pack_info *); static int read_StreamsInfo(struct archive_read *, struct _7z_stream_info *); static int read_SubStreamsInfo(struct archive_read *, struct _7z_substream_info *, struct _7z_folder *, size_t); static int read_Times(struct archive_read *, struct _7z_header_info *, int); static void read_consume(struct archive_read *); static ssize_t read_stream(struct archive_read *, const void **, size_t, size_t); static int seek_pack(struct archive_read *); static int64_t skip_stream(struct archive_read *, size_t); static int skip_sfx(struct archive_read *, ssize_t); static int slurp_central_directory(struct archive_read *, struct _7zip *, struct _7z_header_info *); static int setup_decode_folder(struct archive_read *, struct _7z_folder *, int); static void x86_Init(struct _7zip *); static size_t x86_Convert(struct _7zip *, uint8_t *, size_t); static ssize_t Bcj2_Decode(struct _7zip *, uint8_t *, size_t); int archive_read_support_format_7zip(struct archive *_a) { struct archive_read *a = (struct archive_read *)_a; struct _7zip *zip; int r; archive_check_magic(_a, ARCHIVE_READ_MAGIC, ARCHIVE_STATE_NEW, "archive_read_support_format_7zip"); zip = calloc(1, sizeof(*zip)); if (zip == NULL) { archive_set_error(&a->archive, ENOMEM, "Can't allocate 7zip data"); return (ARCHIVE_FATAL); } /* * Until enough data has been read, we cannot tell about * any encrypted entries yet. */ zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; r = __archive_read_register_format(a, zip, "7zip", archive_read_format_7zip_bid, NULL, archive_read_format_7zip_read_header, archive_read_format_7zip_read_data, archive_read_format_7zip_read_data_skip, NULL, archive_read_format_7zip_cleanup, archive_read_support_format_7zip_capabilities, archive_read_format_7zip_has_encrypted_entries); if (r != ARCHIVE_OK) free(zip); return (ARCHIVE_OK); } static int archive_read_support_format_7zip_capabilities(struct archive_read * a) { (void)a; /* UNUSED */ return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA | ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA); } static int archive_read_format_7zip_has_encrypted_entries(struct archive_read *_a) { if (_a && _a->format) { struct _7zip * zip = (struct _7zip *)_a->format->data; if (zip) { return zip->has_encrypted_entries; } } return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW; } static int archive_read_format_7zip_bid(struct archive_read *a, int best_bid) { const char *p; /* If someone has already bid more than 32, then avoid trashing the look-ahead buffers with a seek. */ if (best_bid > 32) return (-1); if ((p = __archive_read_ahead(a, 6, NULL)) == NULL) return (0); /* If first six bytes are the 7-Zip signature, * return the bid right now. */ if (memcmp(p, _7ZIP_SIGNATURE, 6) == 0) return (48); /* * It may a 7-Zip SFX archive file. If first two bytes are * 'M' and 'Z' available on Windows or first four bytes are * "\x7F\x45LF" available on posix like system, seek the 7-Zip * signature. Although we will perform a seek when reading * a header, what we do not use __archive_read_seek() here is * due to a bidding performance. */ if ((p[0] == 'M' && p[1] == 'Z') || memcmp(p, "\x7F\x45LF", 4) == 0) { ssize_t offset = SFX_MIN_ADDR; ssize_t window = 4096; ssize_t bytes_avail; while (offset + window <= (SFX_MAX_ADDR)) { const char *buff = __archive_read_ahead(a, offset + window, &bytes_avail); if (buff == NULL) { /* Remaining bytes are less than window. */ window >>= 1; if (window < 0x40) return (0); continue; } p = buff + offset; while (p + 32 < buff + bytes_avail) { int step = check_7zip_header_in_sfx(p); if (step == 0) return (48); p += step; } offset = p - buff; } } return (0); } static int check_7zip_header_in_sfx(const char *p) { switch ((unsigned char)p[5]) { case 0x1C: if (memcmp(p, _7ZIP_SIGNATURE, 6) != 0) return (6); /* * Test the CRC because its extraction code has 7-Zip * Magic Code, so we should do this in order not to * make a mis-detection. */ if (crc32(0, (const unsigned char *)p + 12, 20) != archive_le32dec(p + 8)) return (6); /* Hit the header! */ return (0); case 0x37: return (5); case 0x7A: return (4); case 0xBC: return (3); case 0xAF: return (2); case 0x27: return (1); default: return (6); } } static int skip_sfx(struct archive_read *a, ssize_t bytes_avail) { const void *h; const char *p, *q; size_t skip, offset; ssize_t bytes, window; /* * If bytes_avail > SFX_MIN_ADDR we do not have to call * __archive_read_seek() at this time since we have * already had enough data. */ if (bytes_avail > SFX_MIN_ADDR) __archive_read_consume(a, SFX_MIN_ADDR); else if (__archive_read_seek(a, SFX_MIN_ADDR, SEEK_SET) < 0) return (ARCHIVE_FATAL); offset = 0; window = 1; while (offset + window <= SFX_MAX_ADDR - SFX_MIN_ADDR) { h = __archive_read_ahead(a, window, &bytes); if (h == NULL) { /* Remaining bytes are less than window. */ window >>= 1; if (window < 0x40) goto fatal; continue; } if (bytes < 6) { /* This case might happen when window == 1. */ window = 4096; continue; } p = (const char *)h; q = p + bytes; /* * Scan ahead until we find something that looks * like the 7-Zip header. */ while (p + 32 < q) { int step = check_7zip_header_in_sfx(p); if (step == 0) { struct _7zip *zip = (struct _7zip *)a->format->data; skip = p - (const char *)h; __archive_read_consume(a, skip); zip->seek_base = SFX_MIN_ADDR + offset + skip; return (ARCHIVE_OK); } p += step; } skip = p - (const char *)h; __archive_read_consume(a, skip); offset += skip; if (window == 1) window = 4096; } fatal: archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Couldn't find out 7-Zip header"); return (ARCHIVE_FATAL); } static int archive_read_format_7zip_read_header(struct archive_read *a, struct archive_entry *entry) { struct _7zip *zip = (struct _7zip *)a->format->data; struct _7zip_entry *zip_entry; int r, ret = ARCHIVE_OK; struct _7z_folder *folder = 0; uint64_t fidx = 0; /* * It should be sufficient to call archive_read_next_header() for * a reader to determine if an entry is encrypted or not. If the * encryption of an entry is only detectable when calling * archive_read_data(), so be it. We'll do the same check there * as well. */ if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { zip->has_encrypted_entries = 0; } a->archive.archive_format = ARCHIVE_FORMAT_7ZIP; if (a->archive.archive_format_name == NULL) a->archive.archive_format_name = "7-Zip"; if (zip->entries == NULL) { struct _7z_header_info header; memset(&header, 0, sizeof(header)); r = slurp_central_directory(a, zip, &header); free_Header(&header); if (r != ARCHIVE_OK) return (r); zip->entries_remaining = (size_t)zip->numFiles; zip->entry = zip->entries; } else { ++zip->entry; } zip_entry = zip->entry; if (zip->entries_remaining <= 0 || zip_entry == NULL) return ARCHIVE_EOF; --zip->entries_remaining; zip->entry_offset = 0; zip->end_of_entry = 0; zip->entry_crc32 = crc32(0, NULL, 0); /* Setup a string conversion for a filename. */ if (zip->sconv == NULL) { zip->sconv = archive_string_conversion_from_charset( &a->archive, "UTF-16LE", 1); if (zip->sconv == NULL) return (ARCHIVE_FATAL); } /* Figure out if the entry is encrypted by looking at the folder that is associated to the current 7zip entry. If the folder has a coder with a _7Z_CRYPTO codec then the folder is encrypted. Hence the entry must also be encrypted. */ if (zip_entry && zip_entry->folderIndex < zip->si.ci.numFolders) { folder = &(zip->si.ci.folders[zip_entry->folderIndex]); for (fidx=0; folder && fidxnumCoders; fidx++) { switch(folder->coders[fidx].codec) { case _7Z_CRYPTO_MAIN_ZIP: case _7Z_CRYPTO_RAR_29: case _7Z_CRYPTO_AES_256_SHA_256: { archive_entry_set_is_data_encrypted(entry, 1); zip->has_encrypted_entries = 1; break; } } } } /* Now that we've checked for encryption, if there were still no * encrypted entries found we can say for sure that there are none. */ if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { zip->has_encrypted_entries = 0; } if (archive_entry_copy_pathname_l(entry, (const char *)zip_entry->utf16name, zip_entry->name_len, zip->sconv) != 0) { if (errno == ENOMEM) { archive_set_error(&a->archive, ENOMEM, "Can't allocate memory for Pathname"); return (ARCHIVE_FATAL); } archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Pathname cannot be converted " "from %s to current locale.", archive_string_conversion_charset_name(zip->sconv)); ret = ARCHIVE_WARN; } /* Populate some additional entry fields: */ archive_entry_set_mode(entry, zip_entry->mode); if (zip_entry->flg & MTIME_IS_SET) archive_entry_set_mtime(entry, zip_entry->mtime, zip_entry->mtime_ns); if (zip_entry->flg & CTIME_IS_SET) archive_entry_set_ctime(entry, zip_entry->ctime, zip_entry->ctime_ns); if (zip_entry->flg & ATIME_IS_SET) archive_entry_set_atime(entry, zip_entry->atime, zip_entry->atime_ns); if (zip_entry->ssIndex != (uint32_t)-1) { zip->entry_bytes_remaining = zip->si.ss.unpackSizes[zip_entry->ssIndex]; archive_entry_set_size(entry, zip->entry_bytes_remaining); } else { zip->entry_bytes_remaining = 0; archive_entry_set_size(entry, 0); } /* If there's no body, force read_data() to return EOF immediately. */ if (zip->entry_bytes_remaining < 1) zip->end_of_entry = 1; if ((zip_entry->mode & AE_IFMT) == AE_IFLNK) { unsigned char *symname = NULL; size_t symsize = 0; /* * Symbolic-name is recorded as its contents. We have to * read the contents at this time. */ while (zip->entry_bytes_remaining > 0) { const void *buff; unsigned char *mem; size_t size; int64_t offset; r = archive_read_format_7zip_read_data(a, &buff, &size, &offset); if (r < ARCHIVE_WARN) { free(symname); return (r); } mem = realloc(symname, symsize + size + 1); if (mem == NULL) { free(symname); archive_set_error(&a->archive, ENOMEM, "Can't allocate memory for Symname"); return (ARCHIVE_FATAL); } symname = mem; memcpy(symname+symsize, buff, size); symsize += size; } if (symsize == 0) { /* If there is no symname, handle it as a regular * file. */ zip_entry->mode &= ~AE_IFMT; zip_entry->mode |= AE_IFREG; archive_entry_set_mode(entry, zip_entry->mode); } else { symname[symsize] = '\0'; archive_entry_copy_symlink(entry, (const char *)symname); } free(symname); archive_entry_set_size(entry, 0); } /* Set up a more descriptive format name. */ sprintf(zip->format_name, "7-Zip"); a->archive.archive_format_name = zip->format_name; return (ret); } static int archive_read_format_7zip_read_data(struct archive_read *a, const void **buff, size_t *size, int64_t *offset) { struct _7zip *zip; ssize_t bytes; int ret = ARCHIVE_OK; zip = (struct _7zip *)(a->format->data); if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { zip->has_encrypted_entries = 0; } if (zip->pack_stream_bytes_unconsumed) read_consume(a); *offset = zip->entry_offset; *size = 0; *buff = NULL; /* * If we hit end-of-entry last time, clean up and return * ARCHIVE_EOF this time. */ if (zip->end_of_entry) return (ARCHIVE_EOF); bytes = read_stream(a, buff, (size_t)zip->entry_bytes_remaining, 0); if (bytes < 0) return ((int)bytes); if (bytes == 0) { archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Truncated 7-Zip file body"); return (ARCHIVE_FATAL); } zip->entry_bytes_remaining -= bytes; if (zip->entry_bytes_remaining == 0) zip->end_of_entry = 1; /* Update checksum */ if ((zip->entry->flg & CRC32_IS_SET) && bytes) zip->entry_crc32 = crc32(zip->entry_crc32, *buff, (unsigned)bytes); /* If we hit the end, swallow any end-of-data marker. */ if (zip->end_of_entry) { /* Check computed CRC against file contents. */ if ((zip->entry->flg & CRC32_IS_SET) && zip->si.ss.digests[zip->entry->ssIndex] != zip->entry_crc32) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "7-Zip bad CRC: 0x%lx should be 0x%lx", (unsigned long)zip->entry_crc32, (unsigned long)zip->si.ss.digests[ zip->entry->ssIndex]); ret = ARCHIVE_WARN; } } *size = bytes; *offset = zip->entry_offset; zip->entry_offset += bytes; return (ret); } static int archive_read_format_7zip_read_data_skip(struct archive_read *a) { struct _7zip *zip; int64_t bytes_skipped; zip = (struct _7zip *)(a->format->data); if (zip->pack_stream_bytes_unconsumed) read_consume(a); /* If we've already read to end of data, we're done. */ if (zip->end_of_entry) return (ARCHIVE_OK); /* * If the length is at the beginning, we can skip the * compressed data much more quickly. */ bytes_skipped = skip_stream(a, (size_t)zip->entry_bytes_remaining); if (bytes_skipped < 0) return (ARCHIVE_FATAL); zip->entry_bytes_remaining = 0; /* This entry is finished and done. */ zip->end_of_entry = 1; return (ARCHIVE_OK); } static int archive_read_format_7zip_cleanup(struct archive_read *a) { struct _7zip *zip; zip = (struct _7zip *)(a->format->data); free_StreamsInfo(&(zip->si)); free(zip->entries); free(zip->entry_names); free_decompression(a, zip); free(zip->uncompressed_buffer); free(zip->sub_stream_buff[0]); free(zip->sub_stream_buff[1]); free(zip->sub_stream_buff[2]); free(zip->tmp_stream_buff); free(zip); (a->format->data) = NULL; return (ARCHIVE_OK); } static void read_consume(struct archive_read *a) { struct _7zip *zip = (struct _7zip *)a->format->data; if (zip->pack_stream_bytes_unconsumed) { __archive_read_consume(a, zip->pack_stream_bytes_unconsumed); zip->stream_offset += zip->pack_stream_bytes_unconsumed; zip->pack_stream_bytes_unconsumed = 0; } } #ifdef HAVE_LZMA_H /* * Set an error code and choose an error message for liblzma. */ static void set_error(struct archive_read *a, int ret) { switch (ret) { case LZMA_STREAM_END: /* Found end of stream. */ case LZMA_OK: /* Decompressor made some progress. */ break; case LZMA_MEM_ERROR: archive_set_error(&a->archive, ENOMEM, "Lzma library error: Cannot allocate memory"); break; case LZMA_MEMLIMIT_ERROR: archive_set_error(&a->archive, ENOMEM, "Lzma library error: Out of memory"); break; case LZMA_FORMAT_ERROR: archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Lzma library error: format not recognized"); break; case LZMA_OPTIONS_ERROR: archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Lzma library error: Invalid options"); break; case LZMA_DATA_ERROR: archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Lzma library error: Corrupted input data"); break; case LZMA_BUF_ERROR: archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Lzma library error: No progress is possible"); break; default: /* Return an error. */ archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Lzma decompression failed: Unknown error"); break; } } #endif static unsigned long decode_codec_id(const unsigned char *codecId, size_t id_size) { unsigned i; unsigned long id = 0; for (i = 0; i < id_size; i++) { id <<= 8; id += codecId[i]; } return (id); } static Byte ppmd_read(void *p) { struct archive_read *a = ((IByteIn*)p)->a; struct _7zip *zip = (struct _7zip *)(a->format->data); Byte b; if (zip->ppstream.avail_in == 0) { archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Truncated RAR file data"); zip->ppstream.overconsumed = 1; return (0); } b = *zip->ppstream.next_in++; zip->ppstream.avail_in--; zip->ppstream.total_in++; return (b); } static int init_decompression(struct archive_read *a, struct _7zip *zip, const struct _7z_coder *coder1, const struct _7z_coder *coder2) { int r; zip->codec = coder1->codec; zip->codec2 = -1; switch (zip->codec) { case _7Z_COPY: case _7Z_BZ2: case _7Z_DEFLATE: case _7Z_PPMD: if (coder2 != NULL) { if (coder2->codec != _7Z_X86 && coder2->codec != _7Z_X86_BCJ2) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Unsupported filter %lx for %lx", coder2->codec, coder1->codec); return (ARCHIVE_FAILED); } zip->codec2 = coder2->codec; zip->bcj_state = 0; if (coder2->codec == _7Z_X86) x86_Init(zip); } break; default: break; } switch (zip->codec) { case _7Z_COPY: break; case _7Z_LZMA: case _7Z_LZMA2: #ifdef HAVE_LZMA_H #if LZMA_VERSION_MAJOR >= 5 /* Effectively disable the limiter. */ #define LZMA_MEMLIMIT UINT64_MAX #else /* NOTE: This needs to check memory size which running system has. */ #define LZMA_MEMLIMIT (1U << 30) #endif { lzma_options_delta delta_opt; lzma_filter filters[LZMA_FILTERS_MAX], *ff; int fi = 0; if (zip->lzstream_valid) { lzma_end(&(zip->lzstream)); zip->lzstream_valid = 0; } /* * NOTE: liblzma incompletely handle the BCJ+LZMA compressed * data made by 7-Zip because 7-Zip does not add End-Of- * Payload Marker(EOPM) at the end of LZMA compressed data, * and so liblzma cannot know the end of the compressed data * without EOPM. So consequently liblzma will not return last * three or four bytes of uncompressed data because * LZMA_FILTER_X86 filter does not handle input data if its * data size is less than five bytes. If liblzma detect EOPM * or know the uncompressed data size, liblzma will flush out * the remaining that three or four bytes of uncompressed * data. That is why we have to use our converting program * for BCJ+LZMA. If we were able to tell the uncompressed * size to liblzma when using lzma_raw_decoder() liblzma * could correctly deal with BCJ+LZMA. But unfortunately * there is no way to do that. * Discussion about this can be found at XZ Utils forum. */ if (coder2 != NULL) { zip->codec2 = coder2->codec; filters[fi].options = NULL; switch (zip->codec2) { case _7Z_X86: if (zip->codec == _7Z_LZMA2) { filters[fi].id = LZMA_FILTER_X86; fi++; } else /* Use our filter. */ x86_Init(zip); break; case _7Z_X86_BCJ2: /* Use our filter. */ zip->bcj_state = 0; break; case _7Z_DELTA: if (coder2->propertiesSize != 1) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Invalid Delta parameter"); return (ARCHIVE_FAILED); } filters[fi].id = LZMA_FILTER_DELTA; memset(&delta_opt, 0, sizeof(delta_opt)); delta_opt.type = LZMA_DELTA_TYPE_BYTE; delta_opt.dist = (uint32_t)coder2->properties[0] + 1; filters[fi].options = &delta_opt; fi++; break; /* Following filters have not been tested yet. */ case _7Z_POWERPC: filters[fi].id = LZMA_FILTER_POWERPC; fi++; break; case _7Z_IA64: filters[fi].id = LZMA_FILTER_IA64; fi++; break; case _7Z_ARM: filters[fi].id = LZMA_FILTER_ARM; fi++; break; case _7Z_ARMTHUMB: filters[fi].id = LZMA_FILTER_ARMTHUMB; fi++; break; case _7Z_SPARC: filters[fi].id = LZMA_FILTER_SPARC; fi++; break; default: archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Unexpected codec ID: %lX", zip->codec2); return (ARCHIVE_FAILED); } } if (zip->codec == _7Z_LZMA2) filters[fi].id = LZMA_FILTER_LZMA2; else filters[fi].id = LZMA_FILTER_LZMA1; filters[fi].options = NULL; ff = &filters[fi]; r = lzma_properties_decode(&filters[fi], NULL, coder1->properties, (size_t)coder1->propertiesSize); if (r != LZMA_OK) { set_error(a, r); return (ARCHIVE_FAILED); } fi++; filters[fi].id = LZMA_VLI_UNKNOWN; filters[fi].options = NULL; r = lzma_raw_decoder(&(zip->lzstream), filters); free(ff->options); if (r != LZMA_OK) { set_error(a, r); return (ARCHIVE_FAILED); } zip->lzstream_valid = 1; zip->lzstream.total_in = 0; zip->lzstream.total_out = 0; break; } #else archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "LZMA codec is unsupported"); return (ARCHIVE_FAILED); #endif case _7Z_BZ2: #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR) if (zip->bzstream_valid) { BZ2_bzDecompressEnd(&(zip->bzstream)); zip->bzstream_valid = 0; } r = BZ2_bzDecompressInit(&(zip->bzstream), 0, 0); if (r == BZ_MEM_ERROR) r = BZ2_bzDecompressInit(&(zip->bzstream), 0, 1); if (r != BZ_OK) { int err = ARCHIVE_ERRNO_MISC; const char *detail = NULL; switch (r) { case BZ_PARAM_ERROR: detail = "invalid setup parameter"; break; case BZ_MEM_ERROR: err = ENOMEM; detail = "out of memory"; break; case BZ_CONFIG_ERROR: detail = "mis-compiled library"; break; } archive_set_error(&a->archive, err, "Internal error initializing decompressor: %s", detail != NULL ? detail : "??"); zip->bzstream_valid = 0; return (ARCHIVE_FAILED); } zip->bzstream_valid = 1; zip->bzstream.total_in_lo32 = 0; zip->bzstream.total_in_hi32 = 0; zip->bzstream.total_out_lo32 = 0; zip->bzstream.total_out_hi32 = 0; break; #else archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "BZ2 codec is unsupported"); return (ARCHIVE_FAILED); #endif case _7Z_DEFLATE: #ifdef HAVE_ZLIB_H if (zip->stream_valid) r = inflateReset(&(zip->stream)); else r = inflateInit2(&(zip->stream), -15 /* Don't check for zlib header */); if (r != Z_OK) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Couldn't initialize zlib stream."); return (ARCHIVE_FAILED); } zip->stream_valid = 1; zip->stream.total_in = 0; zip->stream.total_out = 0; break; #else archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "DEFLATE codec is unsupported"); return (ARCHIVE_FAILED); #endif case _7Z_PPMD: { unsigned order; uint32_t msize; if (zip->ppmd7_valid) { __archive_ppmd7_functions.Ppmd7_Free( &zip->ppmd7_context); zip->ppmd7_valid = 0; } if (coder1->propertiesSize < 5) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Malformed PPMd parameter"); return (ARCHIVE_FAILED); } order = coder1->properties[0]; msize = archive_le32dec(&(coder1->properties[1])); if (order < PPMD7_MIN_ORDER || order > PPMD7_MAX_ORDER || msize < PPMD7_MIN_MEM_SIZE || msize > PPMD7_MAX_MEM_SIZE) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Malformed PPMd parameter"); return (ARCHIVE_FAILED); } __archive_ppmd7_functions.Ppmd7_Construct(&zip->ppmd7_context); r = __archive_ppmd7_functions.Ppmd7_Alloc( &zip->ppmd7_context, msize); if (r == 0) { archive_set_error(&a->archive, ENOMEM, "Coludn't allocate memory for PPMd"); return (ARCHIVE_FATAL); } __archive_ppmd7_functions.Ppmd7_Init( &zip->ppmd7_context, order); __archive_ppmd7_functions.Ppmd7z_RangeDec_CreateVTable( &zip->range_dec); zip->ppmd7_valid = 1; zip->ppmd7_stat = 0; zip->ppstream.overconsumed = 0; zip->ppstream.total_in = 0; zip->ppstream.total_out = 0; break; } case _7Z_X86: case _7Z_X86_BCJ2: case _7Z_POWERPC: case _7Z_IA64: case _7Z_ARM: case _7Z_ARMTHUMB: case _7Z_SPARC: case _7Z_DELTA: archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Unexpected codec ID: %lX", zip->codec); return (ARCHIVE_FAILED); case _7Z_CRYPTO_MAIN_ZIP: case _7Z_CRYPTO_RAR_29: case _7Z_CRYPTO_AES_256_SHA_256: if (a->entry) { archive_entry_set_is_metadata_encrypted(a->entry, 1); archive_entry_set_is_data_encrypted(a->entry, 1); zip->has_encrypted_entries = 1; } archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Crypto codec not supported yet (ID: 0x%lX)", zip->codec); return (ARCHIVE_FAILED); default: archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Unknown codec ID: %lX", zip->codec); return (ARCHIVE_FAILED); } return (ARCHIVE_OK); } static int decompress(struct archive_read *a, struct _7zip *zip, void *buff, size_t *outbytes, const void *b, size_t *used) { const uint8_t *t_next_in; uint8_t *t_next_out; size_t o_avail_in, o_avail_out; size_t t_avail_in, t_avail_out; uint8_t *bcj2_next_out; size_t bcj2_avail_out; int r, ret = ARCHIVE_OK; t_avail_in = o_avail_in = *used; t_avail_out = o_avail_out = *outbytes; t_next_in = b; t_next_out = buff; if (zip->codec != _7Z_LZMA2 && zip->codec2 == _7Z_X86) { int i; /* Do not copy out the BCJ remaining bytes when the output * buffer size is less than five bytes. */ if (o_avail_in != 0 && t_avail_out < 5 && zip->odd_bcj_size) { *used = 0; *outbytes = 0; return (ret); } for (i = 0; zip->odd_bcj_size > 0 && t_avail_out; i++) { *t_next_out++ = zip->odd_bcj[i]; t_avail_out--; zip->odd_bcj_size--; } if (o_avail_in == 0 || t_avail_out == 0) { *used = o_avail_in - t_avail_in; *outbytes = o_avail_out - t_avail_out; if (o_avail_in == 0) ret = ARCHIVE_EOF; return (ret); } } bcj2_next_out = t_next_out; bcj2_avail_out = t_avail_out; if (zip->codec2 == _7Z_X86_BCJ2) { /* * Decord a remaining decompressed main stream for BCJ2. */ if (zip->tmp_stream_bytes_remaining) { ssize_t bytes; size_t remaining = zip->tmp_stream_bytes_remaining; bytes = Bcj2_Decode(zip, t_next_out, t_avail_out); if (bytes < 0) { archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "BCJ2 conversion Failed"); return (ARCHIVE_FAILED); } zip->main_stream_bytes_remaining -= remaining - zip->tmp_stream_bytes_remaining; t_avail_out -= bytes; if (o_avail_in == 0 || t_avail_out == 0) { *used = 0; *outbytes = o_avail_out - t_avail_out; if (o_avail_in == 0 && zip->tmp_stream_bytes_remaining) ret = ARCHIVE_EOF; return (ret); } t_next_out += bytes; bcj2_next_out = t_next_out; bcj2_avail_out = t_avail_out; } t_next_out = zip->tmp_stream_buff; t_avail_out = zip->tmp_stream_buff_size; } switch (zip->codec) { case _7Z_COPY: { size_t bytes = (t_avail_in > t_avail_out)?t_avail_out:t_avail_in; memcpy(t_next_out, t_next_in, bytes); t_avail_in -= bytes; t_avail_out -= bytes; if (o_avail_in == 0) ret = ARCHIVE_EOF; break; } #ifdef HAVE_LZMA_H case _7Z_LZMA: case _7Z_LZMA2: zip->lzstream.next_in = t_next_in; zip->lzstream.avail_in = t_avail_in; zip->lzstream.next_out = t_next_out; zip->lzstream.avail_out = t_avail_out; r = lzma_code(&(zip->lzstream), LZMA_RUN); switch (r) { case LZMA_STREAM_END: /* Found end of stream. */ lzma_end(&(zip->lzstream)); zip->lzstream_valid = 0; ret = ARCHIVE_EOF; break; case LZMA_OK: /* Decompressor made some progress. */ break; default: archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "Decompression failed(%d)", r); return (ARCHIVE_FAILED); } t_avail_in = zip->lzstream.avail_in; t_avail_out = zip->lzstream.avail_out; break; #endif #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR) case _7Z_BZ2: zip->bzstream.next_in = (char *)(uintptr_t)t_next_in; zip->bzstream.avail_in = t_avail_in; zip->bzstream.next_out = (char *)(uintptr_t)t_next_out; zip->bzstream.avail_out = t_avail_out; r = BZ2_bzDecompress(&(zip->bzstream)); switch (r) { case BZ_STREAM_END: /* Found end of stream. */ switch (BZ2_bzDecompressEnd(&(zip->bzstream))) { case BZ_OK: break; default: archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "Failed to clean up decompressor"); return (ARCHIVE_FAILED); } zip->bzstream_valid = 0; ret = ARCHIVE_EOF; break; case BZ_OK: /* Decompressor made some progress. */ break; default: archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "bzip decompression failed"); return (ARCHIVE_FAILED); } t_avail_in = zip->bzstream.avail_in; t_avail_out = zip->bzstream.avail_out; break; #endif #ifdef HAVE_ZLIB_H case _7Z_DEFLATE: zip->stream.next_in = (Bytef *)(uintptr_t)t_next_in; zip->stream.avail_in = (uInt)t_avail_in; zip->stream.next_out = t_next_out; zip->stream.avail_out = (uInt)t_avail_out; r = inflate(&(zip->stream), 0); switch (r) { case Z_STREAM_END: /* Found end of stream. */ ret = ARCHIVE_EOF; break; case Z_OK: /* Decompressor made some progress.*/ break; default: archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "File decompression failed (%d)", r); return (ARCHIVE_FAILED); } t_avail_in = zip->stream.avail_in; t_avail_out = zip->stream.avail_out; break; #endif case _7Z_PPMD: { uint64_t flush_bytes; if (!zip->ppmd7_valid || zip->ppmd7_stat < 0 || t_avail_out <= 0) { archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "Decompression internal error"); return (ARCHIVE_FAILED); } zip->ppstream.next_in = t_next_in; zip->ppstream.avail_in = t_avail_in; zip->ppstream.next_out = t_next_out; zip->ppstream.avail_out = t_avail_out; if (zip->ppmd7_stat == 0) { zip->bytein.a = a; zip->bytein.Read = &ppmd_read; zip->range_dec.Stream = &zip->bytein; r = __archive_ppmd7_functions.Ppmd7z_RangeDec_Init( &(zip->range_dec)); if (r == 0) { zip->ppmd7_stat = -1; archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Failed to initialize PPMd range decorder"); return (ARCHIVE_FAILED); } if (zip->ppstream.overconsumed) { zip->ppmd7_stat = -1; return (ARCHIVE_FAILED); } zip->ppmd7_stat = 1; } if (t_avail_in == 0) /* XXX Flush out remaining decoded data XXX */ flush_bytes = zip->folder_outbytes_remaining; else flush_bytes = 0; do { int sym; sym = __archive_ppmd7_functions.Ppmd7_DecodeSymbol( &(zip->ppmd7_context), &(zip->range_dec.p)); if (sym < 0) { zip->ppmd7_stat = -1; archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Failed to decode PPMd"); return (ARCHIVE_FAILED); } if (zip->ppstream.overconsumed) { zip->ppmd7_stat = -1; return (ARCHIVE_FAILED); } *zip->ppstream.next_out++ = (unsigned char)sym; zip->ppstream.avail_out--; zip->ppstream.total_out++; if (flush_bytes) flush_bytes--; } while (zip->ppstream.avail_out && (zip->ppstream.avail_in || flush_bytes)); t_avail_in = (size_t)zip->ppstream.avail_in; t_avail_out = (size_t)zip->ppstream.avail_out; break; } default: archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "Decompression internal error"); return (ARCHIVE_FAILED); } if (ret != ARCHIVE_OK && ret != ARCHIVE_EOF) return (ret); *used = o_avail_in - t_avail_in; *outbytes = o_avail_out - t_avail_out; /* * Decord BCJ. */ if (zip->codec != _7Z_LZMA2 && zip->codec2 == _7Z_X86) { size_t l = x86_Convert(zip, buff, *outbytes); zip->odd_bcj_size = *outbytes - l; if (zip->odd_bcj_size > 0 && zip->odd_bcj_size <= 4 && o_avail_in && ret != ARCHIVE_EOF) { memcpy(zip->odd_bcj, ((unsigned char *)buff) + l, zip->odd_bcj_size); *outbytes = l; } else zip->odd_bcj_size = 0; } /* * Decord BCJ2 with a decompressed main stream. */ if (zip->codec2 == _7Z_X86_BCJ2) { ssize_t bytes; zip->tmp_stream_bytes_avail = zip->tmp_stream_buff_size - t_avail_out; if (zip->tmp_stream_bytes_avail > zip->main_stream_bytes_remaining) zip->tmp_stream_bytes_avail = zip->main_stream_bytes_remaining; zip->tmp_stream_bytes_remaining = zip->tmp_stream_bytes_avail; bytes = Bcj2_Decode(zip, bcj2_next_out, bcj2_avail_out); if (bytes < 0) { archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "BCJ2 conversion Failed"); return (ARCHIVE_FAILED); } zip->main_stream_bytes_remaining -= zip->tmp_stream_bytes_avail - zip->tmp_stream_bytes_remaining; bcj2_avail_out -= bytes; *outbytes = o_avail_out - bcj2_avail_out; } return (ret); } static int free_decompression(struct archive_read *a, struct _7zip *zip) { int r = ARCHIVE_OK; #if !defined(HAVE_ZLIB_H) &&\ !(defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)) (void)a;/* UNUSED */ #endif #ifdef HAVE_LZMA_H if (zip->lzstream_valid) lzma_end(&(zip->lzstream)); #endif #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR) if (zip->bzstream_valid) { if (BZ2_bzDecompressEnd(&(zip->bzstream)) != BZ_OK) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Failed to clean up bzip2 decompressor"); r = ARCHIVE_FATAL; } zip->bzstream_valid = 0; } #endif #ifdef HAVE_ZLIB_H if (zip->stream_valid) { if (inflateEnd(&(zip->stream)) != Z_OK) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Failed to clean up zlib decompressor"); r = ARCHIVE_FATAL; } zip->stream_valid = 0; } #endif if (zip->ppmd7_valid) { __archive_ppmd7_functions.Ppmd7_Free( &zip->ppmd7_context); zip->ppmd7_valid = 0; } return (r); } static int parse_7zip_uint64(struct archive_read *a, uint64_t *val) { const unsigned char *p; unsigned char avail, mask; int i; if ((p = header_bytes(a, 1)) == NULL) return (-1); avail = *p; mask = 0x80; *val = 0; for (i = 0; i < 8; i++) { if (avail & mask) { if ((p = header_bytes(a, 1)) == NULL) return (-1); *val |= ((uint64_t)*p) << (8 * i); mask >>= 1; continue; } *val += ((uint64_t)(avail & (mask -1))) << (8 * i); break; } return (0); } static int read_Bools(struct archive_read *a, unsigned char *data, size_t num) { const unsigned char *p; unsigned i, mask = 0, avail = 0; for (i = 0; i < num; i++) { if (mask == 0) { if ((p = header_bytes(a, 1)) == NULL) return (-1); avail = *p; mask = 0x80; } data[i] = (avail & mask)?1:0; mask >>= 1; } return (0); } static void free_Digest(struct _7z_digests *d) { free(d->defineds); free(d->digests); } static int read_Digests(struct archive_read *a, struct _7z_digests *d, size_t num) { const unsigned char *p; unsigned i; if (num == 0) return (-1); memset(d, 0, sizeof(*d)); d->defineds = malloc(num); if (d->defineds == NULL) return (-1); /* * Read Bools. */ if ((p = header_bytes(a, 1)) == NULL) return (-1); if (*p == 0) { if (read_Bools(a, d->defineds, num) < 0) return (-1); } else /* All are defined */ memset(d->defineds, 1, num); d->digests = calloc(num, sizeof(*d->digests)); if (d->digests == NULL) return (-1); for (i = 0; i < num; i++) { if (d->defineds[i]) { if ((p = header_bytes(a, 4)) == NULL) return (-1); d->digests[i] = archive_le32dec(p); } } return (0); } static void free_PackInfo(struct _7z_pack_info *pi) { free(pi->sizes); free(pi->positions); free_Digest(&(pi->digest)); } static int read_PackInfo(struct archive_read *a, struct _7z_pack_info *pi) { const unsigned char *p; unsigned i; memset(pi, 0, sizeof(*pi)); /* * Read PackPos. */ if (parse_7zip_uint64(a, &(pi->pos)) < 0) return (-1); /* * Read NumPackStreams. */ if (parse_7zip_uint64(a, &(pi->numPackStreams)) < 0) return (-1); if (pi->numPackStreams == 0) return (-1); if (UMAX_ENTRY < pi->numPackStreams) return (-1); /* * Read PackSizes[num] */ if ((p = header_bytes(a, 1)) == NULL) return (-1); if (*p == kEnd) /* PackSizes[num] are not present. */ return (0); if (*p != kSize) return (-1); pi->sizes = calloc((size_t)pi->numPackStreams, sizeof(uint64_t)); pi->positions = calloc((size_t)pi->numPackStreams, sizeof(uint64_t)); if (pi->sizes == NULL || pi->positions == NULL) return (-1); for (i = 0; i < pi->numPackStreams; i++) { if (parse_7zip_uint64(a, &(pi->sizes[i])) < 0) return (-1); } /* * Read PackStreamDigests[num] */ if ((p = header_bytes(a, 1)) == NULL) return (-1); if (*p == kEnd) { /* PackStreamDigests[num] are not present. */ pi->digest.defineds = calloc((size_t)pi->numPackStreams, sizeof(*pi->digest.defineds)); pi->digest.digests = calloc((size_t)pi->numPackStreams, sizeof(*pi->digest.digests)); if (pi->digest.defineds == NULL || pi->digest.digests == NULL) return (-1); return (0); } if (*p != kCRC) return (-1); if (read_Digests(a, &(pi->digest), (size_t)pi->numPackStreams) < 0) return (-1); /* * Must be marked by kEnd. */ if ((p = header_bytes(a, 1)) == NULL) return (-1); if (*p != kEnd) return (-1); return (0); } static void free_Folder(struct _7z_folder *f) { unsigned i; if (f->coders) { for (i = 0; i< f->numCoders; i++) { free(f->coders[i].properties); } free(f->coders); } free(f->bindPairs); free(f->packedStreams); free(f->unPackSize); } static int read_Folder(struct archive_read *a, struct _7z_folder *f) { struct _7zip *zip = (struct _7zip *)a->format->data; const unsigned char *p; uint64_t numInStreamsTotal = 0; uint64_t numOutStreamsTotal = 0; unsigned i; memset(f, 0, sizeof(*f)); /* * Read NumCoders. */ if (parse_7zip_uint64(a, &(f->numCoders)) < 0) return (-1); if (f->numCoders > 4) /* Too many coders. */ return (-1); f->coders = calloc((size_t)f->numCoders, sizeof(*f->coders)); if (f->coders == NULL) return (-1); for (i = 0; i< f->numCoders; i++) { size_t codec_size; int simple, attr; if ((p = header_bytes(a, 1)) == NULL) return (-1); /* * 0:3 CodecIdSize * 4: 0 - IsSimple * 1 - Is not Simple * 5: 0 - No Attributes * 1 - There are Attributes; * 7: Must be zero. */ codec_size = *p & 0xf; simple = (*p & 0x10)?0:1; attr = *p & 0x20; if (*p & 0x80) return (-1);/* Not supported. */ /* * Read Decompression Method IDs. */ if ((p = header_bytes(a, codec_size)) == NULL) return (-1); f->coders[i].codec = decode_codec_id(p, codec_size); if (simple) { f->coders[i].numInStreams = 1; f->coders[i].numOutStreams = 1; } else { if (parse_7zip_uint64( a, &(f->coders[i].numInStreams)) < 0) return (-1); if (UMAX_ENTRY < f->coders[i].numInStreams) return (-1); if (parse_7zip_uint64( a, &(f->coders[i].numOutStreams)) < 0) return (-1); if (UMAX_ENTRY < f->coders[i].numOutStreams) return (-1); } if (attr) { if (parse_7zip_uint64( a, &(f->coders[i].propertiesSize)) < 0) return (-1); if ((p = header_bytes( a, (size_t)f->coders[i].propertiesSize)) == NULL) return (-1); f->coders[i].properties = malloc((size_t)f->coders[i].propertiesSize); if (f->coders[i].properties == NULL) return (-1); memcpy(f->coders[i].properties, p, (size_t)f->coders[i].propertiesSize); } numInStreamsTotal += f->coders[i].numInStreams; numOutStreamsTotal += f->coders[i].numOutStreams; } if (numOutStreamsTotal == 0 || numInStreamsTotal < numOutStreamsTotal-1) return (-1); f->numBindPairs = numOutStreamsTotal - 1; if (zip->header_bytes_remaining < f->numBindPairs) return (-1); if (f->numBindPairs > 0) { f->bindPairs = calloc((size_t)f->numBindPairs, sizeof(*f->bindPairs)); if (f->bindPairs == NULL) return (-1); } else f->bindPairs = NULL; for (i = 0; i < f->numBindPairs; i++) { if (parse_7zip_uint64(a, &(f->bindPairs[i].inIndex)) < 0) return (-1); if (UMAX_ENTRY < f->bindPairs[i].inIndex) return (-1); if (parse_7zip_uint64(a, &(f->bindPairs[i].outIndex)) < 0) return (-1); if (UMAX_ENTRY < f->bindPairs[i].outIndex) return (-1); } f->numPackedStreams = numInStreamsTotal - f->numBindPairs; f->packedStreams = calloc((size_t)f->numPackedStreams, sizeof(*f->packedStreams)); if (f->packedStreams == NULL) return (-1); if (f->numPackedStreams == 1) { for (i = 0; i < numInStreamsTotal; i++) { unsigned j; for (j = 0; j < f->numBindPairs; j++) { if (f->bindPairs[j].inIndex == i) break; } if (j == f->numBindPairs) break; } if (i == numInStreamsTotal) return (-1); f->packedStreams[0] = i; } else { for (i = 0; i < f->numPackedStreams; i++) { if (parse_7zip_uint64(a, &(f->packedStreams[i])) < 0) return (-1); if (UMAX_ENTRY < f->packedStreams[i]) return (-1); } } f->numInStreams = numInStreamsTotal; f->numOutStreams = numOutStreamsTotal; return (0); } static void free_CodersInfo(struct _7z_coders_info *ci) { unsigned i; if (ci->folders) { for (i = 0; i < ci->numFolders; i++) free_Folder(&(ci->folders[i])); free(ci->folders); } } static int read_CodersInfo(struct archive_read *a, struct _7z_coders_info *ci) { const unsigned char *p; struct _7z_digests digest; unsigned i; memset(ci, 0, sizeof(*ci)); memset(&digest, 0, sizeof(digest)); if ((p = header_bytes(a, 1)) == NULL) goto failed; if (*p != kFolder) goto failed; /* * Read NumFolders. */ if (parse_7zip_uint64(a, &(ci->numFolders)) < 0) goto failed; if (UMAX_ENTRY < ci->numFolders) return (-1); /* * Read External. */ if ((p = header_bytes(a, 1)) == NULL) goto failed; switch (*p) { case 0: ci->folders = calloc((size_t)ci->numFolders, sizeof(*ci->folders)); if (ci->folders == NULL) return (-1); for (i = 0; i < ci->numFolders; i++) { if (read_Folder(a, &(ci->folders[i])) < 0) goto failed; } break; case 1: if (parse_7zip_uint64(a, &(ci->dataStreamIndex)) < 0) return (-1); if (UMAX_ENTRY < ci->dataStreamIndex) return (-1); if (ci->numFolders > 0) { archive_set_error(&a->archive, -1, "Malformed 7-Zip archive"); goto failed; } break; default: archive_set_error(&a->archive, -1, "Malformed 7-Zip archive"); goto failed; } if ((p = header_bytes(a, 1)) == NULL) goto failed; if (*p != kCodersUnPackSize) goto failed; for (i = 0; i < ci->numFolders; i++) { struct _7z_folder *folder = &(ci->folders[i]); unsigned j; folder->unPackSize = calloc((size_t)folder->numOutStreams, sizeof(*folder->unPackSize)); if (folder->unPackSize == NULL) goto failed; for (j = 0; j < folder->numOutStreams; j++) { if (parse_7zip_uint64(a, &(folder->unPackSize[j])) < 0) goto failed; } } /* * Read CRCs. */ if ((p = header_bytes(a, 1)) == NULL) goto failed; if (*p == kEnd) return (0); if (*p != kCRC) goto failed; if (read_Digests(a, &digest, (size_t)ci->numFolders) < 0) goto failed; for (i = 0; i < ci->numFolders; i++) { ci->folders[i].digest_defined = digest.defineds[i]; ci->folders[i].digest = digest.digests[i]; } /* * Must be kEnd. */ if ((p = header_bytes(a, 1)) == NULL) goto failed; if (*p != kEnd) goto failed; free_Digest(&digest); return (0); failed: free_Digest(&digest); return (-1); } static uint64_t folder_uncompressed_size(struct _7z_folder *f) { int n = (int)f->numOutStreams; unsigned pairs = (unsigned)f->numBindPairs; while (--n >= 0) { unsigned i; for (i = 0; i < pairs; i++) { if (f->bindPairs[i].outIndex == (uint64_t)n) break; } if (i >= pairs) return (f->unPackSize[n]); } return (0); } static void free_SubStreamsInfo(struct _7z_substream_info *ss) { free(ss->unpackSizes); free(ss->digestsDefined); free(ss->digests); } static int read_SubStreamsInfo(struct archive_read *a, struct _7z_substream_info *ss, struct _7z_folder *f, size_t numFolders) { const unsigned char *p; uint64_t *usizes; size_t unpack_streams; int type; unsigned i; uint32_t numDigests; memset(ss, 0, sizeof(*ss)); for (i = 0; i < numFolders; i++) f[i].numUnpackStreams = 1; if ((p = header_bytes(a, 1)) == NULL) return (-1); type = *p; if (type == kNumUnPackStream) { unpack_streams = 0; for (i = 0; i < numFolders; i++) { if (parse_7zip_uint64(a, &(f[i].numUnpackStreams)) < 0) return (-1); if (UMAX_ENTRY < f[i].numUnpackStreams) return (-1); if (unpack_streams > SIZE_MAX - UMAX_ENTRY) { return (-1); } unpack_streams += (size_t)f[i].numUnpackStreams; } if ((p = header_bytes(a, 1)) == NULL) return (-1); type = *p; } else unpack_streams = numFolders; ss->unpack_streams = unpack_streams; if (unpack_streams) { ss->unpackSizes = calloc(unpack_streams, sizeof(*ss->unpackSizes)); ss->digestsDefined = calloc(unpack_streams, sizeof(*ss->digestsDefined)); ss->digests = calloc(unpack_streams, sizeof(*ss->digests)); if (ss->unpackSizes == NULL || ss->digestsDefined == NULL || ss->digests == NULL) return (-1); } usizes = ss->unpackSizes; for (i = 0; i < numFolders; i++) { unsigned pack; uint64_t sum; if (f[i].numUnpackStreams == 0) continue; sum = 0; if (type == kSize) { for (pack = 1; pack < f[i].numUnpackStreams; pack++) { if (parse_7zip_uint64(a, usizes) < 0) return (-1); sum += *usizes++; } } *usizes++ = folder_uncompressed_size(&f[i]) - sum; } if (type == kSize) { if ((p = header_bytes(a, 1)) == NULL) return (-1); type = *p; } for (i = 0; i < unpack_streams; i++) { ss->digestsDefined[i] = 0; ss->digests[i] = 0; } numDigests = 0; for (i = 0; i < numFolders; i++) { if (f[i].numUnpackStreams != 1 || !f[i].digest_defined) numDigests += (uint32_t)f[i].numUnpackStreams; } if (type == kCRC) { struct _7z_digests tmpDigests; unsigned char *digestsDefined = ss->digestsDefined; uint32_t * digests = ss->digests; int di = 0; memset(&tmpDigests, 0, sizeof(tmpDigests)); if (read_Digests(a, &(tmpDigests), numDigests) < 0) { free_Digest(&tmpDigests); return (-1); } for (i = 0; i < numFolders; i++) { if (f[i].numUnpackStreams == 1 && f[i].digest_defined) { *digestsDefined++ = 1; *digests++ = f[i].digest; } else { unsigned j; for (j = 0; j < f[i].numUnpackStreams; j++, di++) { *digestsDefined++ = tmpDigests.defineds[di]; *digests++ = tmpDigests.digests[di]; } } } free_Digest(&tmpDigests); if ((p = header_bytes(a, 1)) == NULL) return (-1); type = *p; } /* * Must be kEnd. */ if (type != kEnd) return (-1); return (0); } static void free_StreamsInfo(struct _7z_stream_info *si) { free_PackInfo(&(si->pi)); free_CodersInfo(&(si->ci)); free_SubStreamsInfo(&(si->ss)); } static int read_StreamsInfo(struct archive_read *a, struct _7z_stream_info *si) { struct _7zip *zip = (struct _7zip *)a->format->data; const unsigned char *p; unsigned i; memset(si, 0, sizeof(*si)); if ((p = header_bytes(a, 1)) == NULL) return (-1); if (*p == kPackInfo) { uint64_t packPos; if (read_PackInfo(a, &(si->pi)) < 0) return (-1); if (si->pi.positions == NULL || si->pi.sizes == NULL) return (-1); /* * Calculate packed stream positions. */ packPos = si->pi.pos; for (i = 0; i < si->pi.numPackStreams; i++) { si->pi.positions[i] = packPos; packPos += si->pi.sizes[i]; if (packPos > zip->header_offset) return (-1); } if ((p = header_bytes(a, 1)) == NULL) return (-1); } if (*p == kUnPackInfo) { uint32_t packIndex; struct _7z_folder *f; if (read_CodersInfo(a, &(si->ci)) < 0) return (-1); /* * Calculate packed stream indexes. */ packIndex = 0; f = si->ci.folders; for (i = 0; i < si->ci.numFolders; i++) { f[i].packIndex = packIndex; packIndex += (uint32_t)f[i].numPackedStreams; if (packIndex > si->pi.numPackStreams) return (-1); } if ((p = header_bytes(a, 1)) == NULL) return (-1); } if (*p == kSubStreamsInfo) { if (read_SubStreamsInfo(a, &(si->ss), si->ci.folders, (size_t)si->ci.numFolders) < 0) return (-1); if ((p = header_bytes(a, 1)) == NULL) return (-1); } /* * Must be kEnd. */ if (*p != kEnd) return (-1); return (0); } static void free_Header(struct _7z_header_info *h) { free(h->emptyStreamBools); free(h->emptyFileBools); free(h->antiBools); free(h->attrBools); } static int read_Header(struct archive_read *a, struct _7z_header_info *h, int check_header_id) { struct _7zip *zip = (struct _7zip *)a->format->data; const unsigned char *p; struct _7z_folder *folders; struct _7z_stream_info *si = &(zip->si); struct _7zip_entry *entries; uint32_t folderIndex, indexInFolder; unsigned i; int eindex, empty_streams, sindex; if (check_header_id) { /* * Read Header. */ if ((p = header_bytes(a, 1)) == NULL) return (-1); if (*p != kHeader) return (-1); } /* * Read ArchiveProperties. */ if ((p = header_bytes(a, 1)) == NULL) return (-1); if (*p == kArchiveProperties) { for (;;) { uint64_t size; if ((p = header_bytes(a, 1)) == NULL) return (-1); if (*p == 0) break; if (parse_7zip_uint64(a, &size) < 0) return (-1); } if ((p = header_bytes(a, 1)) == NULL) return (-1); } /* * Read MainStreamsInfo. */ if (*p == kMainStreamsInfo) { if (read_StreamsInfo(a, &(zip->si)) < 0) return (-1); if ((p = header_bytes(a, 1)) == NULL) return (-1); } if (*p == kEnd) return (0); /* * Read FilesInfo. */ if (*p != kFilesInfo) return (-1); if (parse_7zip_uint64(a, &(zip->numFiles)) < 0) return (-1); if (UMAX_ENTRY < zip->numFiles) return (-1); zip->entries = calloc((size_t)zip->numFiles, sizeof(*zip->entries)); if (zip->entries == NULL) return (-1); entries = zip->entries; empty_streams = 0; for (;;) { int type; uint64_t size; size_t ll; if ((p = header_bytes(a, 1)) == NULL) return (-1); type = *p; if (type == kEnd) break; if (parse_7zip_uint64(a, &size) < 0) return (-1); if (zip->header_bytes_remaining < size) return (-1); ll = (size_t)size; switch (type) { case kEmptyStream: if (h->emptyStreamBools != NULL) return (-1); h->emptyStreamBools = calloc((size_t)zip->numFiles, sizeof(*h->emptyStreamBools)); if (h->emptyStreamBools == NULL) return (-1); if (read_Bools( a, h->emptyStreamBools, (size_t)zip->numFiles) < 0) return (-1); empty_streams = 0; for (i = 0; i < zip->numFiles; i++) { if (h->emptyStreamBools[i]) empty_streams++; } break; case kEmptyFile: if (empty_streams <= 0) { /* Unexcepted sequence. Skip this. */ if (header_bytes(a, ll) == NULL) return (-1); break; } if (h->emptyFileBools != NULL) return (-1); h->emptyFileBools = calloc(empty_streams, sizeof(*h->emptyFileBools)); if (h->emptyFileBools == NULL) return (-1); if (read_Bools(a, h->emptyFileBools, empty_streams) < 0) return (-1); break; case kAnti: if (empty_streams <= 0) { /* Unexcepted sequence. Skip this. */ if (header_bytes(a, ll) == NULL) return (-1); break; } if (h->antiBools != NULL) return (-1); h->antiBools = calloc(empty_streams, sizeof(*h->antiBools)); if (h->antiBools == NULL) return (-1); if (read_Bools(a, h->antiBools, empty_streams) < 0) return (-1); break; case kCTime: case kATime: case kMTime: if (read_Times(a, h, type) < 0) return (-1); break; case kName: { unsigned char *np; size_t nl, nb; /* Skip one byte. */ if ((p = header_bytes(a, 1)) == NULL) return (-1); ll--; if ((ll & 1) || ll < zip->numFiles * 4) return (-1); if (zip->entry_names != NULL) return (-1); zip->entry_names = malloc(ll); if (zip->entry_names == NULL) return (-1); np = zip->entry_names; nb = ll; /* * Copy whole file names. * NOTE: This loop prevents from expanding * the uncompressed buffer in order not to * use extra memory resource. */ while (nb) { size_t b; if (nb > UBUFF_SIZE) b = UBUFF_SIZE; else b = nb; if ((p = header_bytes(a, b)) == NULL) return (-1); memcpy(np, p, b); np += b; nb -= b; } np = zip->entry_names; nl = ll; for (i = 0; i < zip->numFiles; i++) { entries[i].utf16name = np; #if defined(_WIN32) && !defined(__CYGWIN__) && defined(_DEBUG) entries[i].wname = (wchar_t *)np; #endif /* Find a terminator. */ while (nl >= 2 && (np[0] || np[1])) { np += 2; nl -= 2; } if (nl < 2) return (-1);/* Terminator not found */ entries[i].name_len = np - entries[i].utf16name; np += 2; nl -= 2; } break; } case kAttributes: { int allAreDefined; if ((p = header_bytes(a, 2)) == NULL) return (-1); allAreDefined = *p; if (h->attrBools != NULL) return (-1); h->attrBools = calloc((size_t)zip->numFiles, sizeof(*h->attrBools)); if (h->attrBools == NULL) return (-1); if (allAreDefined) memset(h->attrBools, 1, (size_t)zip->numFiles); else { if (read_Bools(a, h->attrBools, (size_t)zip->numFiles) < 0) return (-1); } for (i = 0; i < zip->numFiles; i++) { if (h->attrBools[i]) { if ((p = header_bytes(a, 4)) == NULL) return (-1); entries[i].attr = archive_le32dec(p); } } break; } case kDummy: if (ll == 0) break; __LA_FALLTHROUGH; default: if (header_bytes(a, ll) == NULL) return (-1); break; } } /* * Set up entry's attributes. */ folders = si->ci.folders; eindex = sindex = 0; folderIndex = indexInFolder = 0; for (i = 0; i < zip->numFiles; i++) { if (h->emptyStreamBools == NULL || h->emptyStreamBools[i] == 0) entries[i].flg |= HAS_STREAM; /* The high 16 bits of attributes is a posix file mode. */ entries[i].mode = entries[i].attr >> 16; if (entries[i].flg & HAS_STREAM) { if ((size_t)sindex >= si->ss.unpack_streams) return (-1); if (entries[i].mode == 0) entries[i].mode = AE_IFREG | 0666; if (si->ss.digestsDefined[sindex]) entries[i].flg |= CRC32_IS_SET; entries[i].ssIndex = sindex; sindex++; } else { int dir; if (h->emptyFileBools == NULL) dir = 1; else { if (h->emptyFileBools[eindex]) dir = 0; else dir = 1; eindex++; } if (entries[i].mode == 0) { if (dir) entries[i].mode = AE_IFDIR | 0777; else entries[i].mode = AE_IFREG | 0666; } else if (dir && (entries[i].mode & AE_IFMT) != AE_IFDIR) { entries[i].mode &= ~AE_IFMT; entries[i].mode |= AE_IFDIR; } if ((entries[i].mode & AE_IFMT) == AE_IFDIR && entries[i].name_len >= 2 && (entries[i].utf16name[entries[i].name_len-2] != '/' || entries[i].utf16name[entries[i].name_len-1] != 0)) { entries[i].utf16name[entries[i].name_len] = '/'; entries[i].utf16name[entries[i].name_len+1] = 0; entries[i].name_len += 2; } entries[i].ssIndex = -1; } if (entries[i].attr & 0x01) entries[i].mode &= ~0222;/* Read only. */ if ((entries[i].flg & HAS_STREAM) == 0 && indexInFolder == 0) { /* * The entry is an empty file or a directory file, * those both have no contents. */ entries[i].folderIndex = -1; continue; } if (indexInFolder == 0) { for (;;) { if (folderIndex >= si->ci.numFolders) return (-1); if (folders[folderIndex].numUnpackStreams) break; folderIndex++; } } entries[i].folderIndex = folderIndex; if ((entries[i].flg & HAS_STREAM) == 0) continue; indexInFolder++; if (indexInFolder >= folders[folderIndex].numUnpackStreams) { folderIndex++; indexInFolder = 0; } } return (0); } #define EPOC_TIME ARCHIVE_LITERAL_ULL(116444736000000000) static void fileTimeToUtc(uint64_t fileTime, time_t *timep, long *ns) { if (fileTime >= EPOC_TIME) { fileTime -= EPOC_TIME; /* milli seconds base */ *timep = (time_t)(fileTime / 10000000); /* nano seconds base */ *ns = (long)(fileTime % 10000000) * 100; } else { *timep = 0; *ns = 0; } } static int read_Times(struct archive_read *a, struct _7z_header_info *h, int type) { struct _7zip *zip = (struct _7zip *)a->format->data; const unsigned char *p; struct _7zip_entry *entries = zip->entries; unsigned char *timeBools; int allAreDefined; unsigned i; timeBools = calloc((size_t)zip->numFiles, sizeof(*timeBools)); if (timeBools == NULL) return (-1); /* Read allAreDefined. */ if ((p = header_bytes(a, 1)) == NULL) goto failed; allAreDefined = *p; if (allAreDefined) memset(timeBools, 1, (size_t)zip->numFiles); else { if (read_Bools(a, timeBools, (size_t)zip->numFiles) < 0) goto failed; } /* Read external. */ if ((p = header_bytes(a, 1)) == NULL) goto failed; if (*p) { if (parse_7zip_uint64(a, &(h->dataIndex)) < 0) goto failed; if (UMAX_ENTRY < h->dataIndex) goto failed; } for (i = 0; i < zip->numFiles; i++) { if (!timeBools[i]) continue; if ((p = header_bytes(a, 8)) == NULL) goto failed; switch (type) { case kCTime: fileTimeToUtc(archive_le64dec(p), &(entries[i].ctime), &(entries[i].ctime_ns)); entries[i].flg |= CTIME_IS_SET; break; case kATime: fileTimeToUtc(archive_le64dec(p), &(entries[i].atime), &(entries[i].atime_ns)); entries[i].flg |= ATIME_IS_SET; break; case kMTime: fileTimeToUtc(archive_le64dec(p), &(entries[i].mtime), &(entries[i].mtime_ns)); entries[i].flg |= MTIME_IS_SET; break; } } free(timeBools); return (0); failed: free(timeBools); return (-1); } static int decode_encoded_header_info(struct archive_read *a, struct _7z_stream_info *si) { struct _7zip *zip = (struct _7zip *)a->format->data; errno = 0; if (read_StreamsInfo(a, si) < 0) { if (errno == ENOMEM) archive_set_error(&a->archive, -1, "Couldn't allocate memory"); else archive_set_error(&a->archive, -1, "Malformed 7-Zip archive"); return (ARCHIVE_FATAL); } if (si->pi.numPackStreams == 0 || si->ci.numFolders == 0) { archive_set_error(&a->archive, -1, "Malformed 7-Zip archive"); return (ARCHIVE_FATAL); } if (zip->header_offset < si->pi.pos + si->pi.sizes[0] || (int64_t)(si->pi.pos + si->pi.sizes[0]) < 0 || si->pi.sizes[0] == 0 || (int64_t)si->pi.pos < 0) { archive_set_error(&a->archive, -1, "Malformed Header offset"); return (ARCHIVE_FATAL); } return (ARCHIVE_OK); } static const unsigned char * header_bytes(struct archive_read *a, size_t rbytes) { struct _7zip *zip = (struct _7zip *)a->format->data; const unsigned char *p; if (zip->header_bytes_remaining < rbytes) return (NULL); if (zip->pack_stream_bytes_unconsumed) read_consume(a); if (zip->header_is_encoded == 0) { p = __archive_read_ahead(a, rbytes, NULL); if (p == NULL) return (NULL); zip->header_bytes_remaining -= rbytes; zip->pack_stream_bytes_unconsumed = rbytes; } else { const void *buff; ssize_t bytes; bytes = read_stream(a, &buff, rbytes, rbytes); if (bytes <= 0) return (NULL); zip->header_bytes_remaining -= bytes; p = buff; } /* Update checksum */ zip->header_crc32 = crc32(zip->header_crc32, p, (unsigned)rbytes); return (p); } static int slurp_central_directory(struct archive_read *a, struct _7zip *zip, struct _7z_header_info *header) { const unsigned char *p; uint64_t next_header_offset; uint64_t next_header_size; uint32_t next_header_crc; ssize_t bytes_avail; int check_header_crc, r; if ((p = __archive_read_ahead(a, 32, &bytes_avail)) == NULL) return (ARCHIVE_FATAL); if ((p[0] == 'M' && p[1] == 'Z') || memcmp(p, "\x7F\x45LF", 4) == 0) { /* This is an executable ? Must be self-extracting... */ r = skip_sfx(a, bytes_avail); if (r < ARCHIVE_WARN) return (r); if ((p = __archive_read_ahead(a, 32, &bytes_avail)) == NULL) return (ARCHIVE_FATAL); } zip->seek_base += 32; if (memcmp(p, _7ZIP_SIGNATURE, 6) != 0) { archive_set_error(&a->archive, -1, "Not 7-Zip archive file"); return (ARCHIVE_FATAL); } /* CRC check. */ if (crc32(0, (const unsigned char *)p + 12, 20) != archive_le32dec(p + 8)) { archive_set_error(&a->archive, -1, "Header CRC error"); return (ARCHIVE_FATAL); } next_header_offset = archive_le64dec(p + 12); next_header_size = archive_le64dec(p + 20); next_header_crc = archive_le32dec(p + 28); if (next_header_size == 0) /* There is no entry in an archive file. */ return (ARCHIVE_EOF); if (((int64_t)next_header_offset) < 0) { archive_set_error(&a->archive, -1, "Malformed 7-Zip archive"); return (ARCHIVE_FATAL); } __archive_read_consume(a, 32); if (next_header_offset != 0) { if (bytes_avail >= (ssize_t)next_header_offset) __archive_read_consume(a, next_header_offset); else if (__archive_read_seek(a, next_header_offset + zip->seek_base, SEEK_SET) < 0) return (ARCHIVE_FATAL); } zip->stream_offset = next_header_offset; zip->header_offset = next_header_offset; zip->header_bytes_remaining = next_header_size; zip->header_crc32 = 0; zip->header_is_encoded = 0; zip->header_is_being_read = 1; zip->has_encrypted_entries = 0; check_header_crc = 1; if ((p = header_bytes(a, 1)) == NULL) { archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Truncated 7-Zip file body"); return (ARCHIVE_FATAL); } /* Parse ArchiveProperties. */ switch (p[0]) { case kEncodedHeader: /* * The archive has an encoded header and we have to decode it * in order to parse the header correctly. */ r = decode_encoded_header_info(a, &(zip->si)); /* Check the EncodedHeader CRC.*/ if (r == 0 && zip->header_crc32 != next_header_crc) { archive_set_error(&a->archive, -1, "Damaged 7-Zip archive"); r = -1; } if (r == 0) { if (zip->si.ci.folders[0].digest_defined) next_header_crc = zip->si.ci.folders[0].digest; else check_header_crc = 0; if (zip->pack_stream_bytes_unconsumed) read_consume(a); r = setup_decode_folder(a, zip->si.ci.folders, 1); if (r == 0) { zip->header_bytes_remaining = zip->folder_outbytes_remaining; r = seek_pack(a); } } /* Clean up StreamsInfo. */ free_StreamsInfo(&(zip->si)); memset(&(zip->si), 0, sizeof(zip->si)); if (r < 0) return (ARCHIVE_FATAL); zip->header_is_encoded = 1; zip->header_crc32 = 0; /* FALL THROUGH */ case kHeader: /* * Parse the header. */ errno = 0; r = read_Header(a, header, zip->header_is_encoded); if (r < 0) { if (errno == ENOMEM) archive_set_error(&a->archive, -1, "Couldn't allocate memory"); else archive_set_error(&a->archive, -1, "Damaged 7-Zip archive"); return (ARCHIVE_FATAL); } /* * Must be kEnd. */ if ((p = header_bytes(a, 1)) == NULL ||*p != kEnd) { archive_set_error(&a->archive, -1, "Malformed 7-Zip archive"); return (ARCHIVE_FATAL); } /* Check the Header CRC.*/ if (check_header_crc && zip->header_crc32 != next_header_crc) { archive_set_error(&a->archive, -1, "Malformed 7-Zip archive"); return (ARCHIVE_FATAL); } break; default: archive_set_error(&a->archive, -1, "Unexpected Property ID = %X", p[0]); return (ARCHIVE_FATAL); } /* Clean up variables be used for decoding the archive header */ zip->pack_stream_remaining = 0; zip->pack_stream_index = 0; zip->folder_outbytes_remaining = 0; zip->uncompressed_buffer_bytes_remaining = 0; zip->pack_stream_bytes_unconsumed = 0; zip->header_is_being_read = 0; return (ARCHIVE_OK); } static ssize_t get_uncompressed_data(struct archive_read *a, const void **buff, size_t size, size_t minimum) { struct _7zip *zip = (struct _7zip *)a->format->data; ssize_t bytes_avail; if (zip->codec == _7Z_COPY && zip->codec2 == (unsigned long)-1) { /* Copy mode. */ *buff = __archive_read_ahead(a, minimum, &bytes_avail); if (bytes_avail <= 0) { archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Truncated 7-Zip file data"); return (ARCHIVE_FATAL); } if ((size_t)bytes_avail > zip->uncompressed_buffer_bytes_remaining) bytes_avail = (ssize_t) zip->uncompressed_buffer_bytes_remaining; if ((size_t)bytes_avail > size) bytes_avail = (ssize_t)size; zip->pack_stream_bytes_unconsumed = bytes_avail; } else if (zip->uncompressed_buffer_pointer == NULL) { /* Decompression has failed. */ archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive"); return (ARCHIVE_FATAL); } else { /* Packed mode. */ if (minimum > zip->uncompressed_buffer_bytes_remaining) { /* * If remaining uncompressed data size is less than * the minimum size, fill the buffer up to the * minimum size. */ if (extract_pack_stream(a, minimum) < 0) return (ARCHIVE_FATAL); } if (size > zip->uncompressed_buffer_bytes_remaining) bytes_avail = (ssize_t) zip->uncompressed_buffer_bytes_remaining; else bytes_avail = (ssize_t)size; *buff = zip->uncompressed_buffer_pointer; zip->uncompressed_buffer_pointer += bytes_avail; } zip->uncompressed_buffer_bytes_remaining -= bytes_avail; return (bytes_avail); } static ssize_t extract_pack_stream(struct archive_read *a, size_t minimum) { struct _7zip *zip = (struct _7zip *)a->format->data; ssize_t bytes_avail; int r; if (zip->codec == _7Z_COPY && zip->codec2 == (unsigned long)-1) { if (minimum == 0) minimum = 1; if (__archive_read_ahead(a, minimum, &bytes_avail) == NULL || bytes_avail <= 0) { archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Truncated 7-Zip file body"); return (ARCHIVE_FATAL); } if (bytes_avail > (ssize_t)zip->pack_stream_inbytes_remaining) bytes_avail = (ssize_t)zip->pack_stream_inbytes_remaining; zip->pack_stream_inbytes_remaining -= bytes_avail; if (bytes_avail > (ssize_t)zip->folder_outbytes_remaining) bytes_avail = (ssize_t)zip->folder_outbytes_remaining; zip->folder_outbytes_remaining -= bytes_avail; zip->uncompressed_buffer_bytes_remaining = bytes_avail; return (ARCHIVE_OK); } /* If the buffer hasn't been allocated, allocate it now. */ if (zip->uncompressed_buffer == NULL) { zip->uncompressed_buffer_size = UBUFF_SIZE; if (zip->uncompressed_buffer_size < minimum) { zip->uncompressed_buffer_size = minimum + 1023; zip->uncompressed_buffer_size &= ~0x3ff; } zip->uncompressed_buffer = malloc(zip->uncompressed_buffer_size); if (zip->uncompressed_buffer == NULL) { archive_set_error(&a->archive, ENOMEM, "No memory for 7-Zip decompression"); return (ARCHIVE_FATAL); } zip->uncompressed_buffer_bytes_remaining = 0; } else if (zip->uncompressed_buffer_size < minimum || zip->uncompressed_buffer_bytes_remaining < minimum) { /* * Make sure the uncompressed buffer can have bytes * at least `minimum' bytes. * NOTE: This case happen when reading the header. */ size_t used; if (zip->uncompressed_buffer_pointer != 0) used = zip->uncompressed_buffer_pointer - zip->uncompressed_buffer; else used = 0; if (zip->uncompressed_buffer_size < minimum) { /* * Expand the uncompressed buffer up to * the minimum size. */ void *p; size_t new_size; new_size = minimum + 1023; new_size &= ~0x3ff; p = realloc(zip->uncompressed_buffer, new_size); if (p == NULL) { archive_set_error(&a->archive, ENOMEM, "No memory for 7-Zip decompression"); return (ARCHIVE_FATAL); } zip->uncompressed_buffer = (unsigned char *)p; zip->uncompressed_buffer_size = new_size; } /* * Move unconsumed bytes to the head. */ if (used) { memmove(zip->uncompressed_buffer, zip->uncompressed_buffer + used, zip->uncompressed_buffer_bytes_remaining); } } else zip->uncompressed_buffer_bytes_remaining = 0; zip->uncompressed_buffer_pointer = NULL; for (;;) { size_t bytes_in, bytes_out; const void *buff_in; unsigned char *buff_out; int end_of_data; /* * Note: '1' here is a performance optimization. * Recall that the decompression layer returns a count of * available bytes; asking for more than that forces the * decompressor to combine reads by copying data. */ buff_in = __archive_read_ahead(a, 1, &bytes_avail); if (bytes_avail <= 0) { archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Truncated 7-Zip file body"); return (ARCHIVE_FATAL); } buff_out = zip->uncompressed_buffer + zip->uncompressed_buffer_bytes_remaining; bytes_out = zip->uncompressed_buffer_size - zip->uncompressed_buffer_bytes_remaining; bytes_in = bytes_avail; if (bytes_in > zip->pack_stream_inbytes_remaining) bytes_in = (size_t)zip->pack_stream_inbytes_remaining; /* Drive decompression. */ r = decompress(a, zip, buff_out, &bytes_out, buff_in, &bytes_in); switch (r) { case ARCHIVE_OK: end_of_data = 0; break; case ARCHIVE_EOF: end_of_data = 1; break; default: return (ARCHIVE_FATAL); } zip->pack_stream_inbytes_remaining -= bytes_in; if (bytes_out > zip->folder_outbytes_remaining) bytes_out = (size_t)zip->folder_outbytes_remaining; zip->folder_outbytes_remaining -= bytes_out; zip->uncompressed_buffer_bytes_remaining += bytes_out; zip->pack_stream_bytes_unconsumed = bytes_in; /* * Continue decompression until uncompressed_buffer is full. */ if (zip->uncompressed_buffer_bytes_remaining == zip->uncompressed_buffer_size) break; if (zip->codec2 == _7Z_X86 && zip->odd_bcj_size && zip->uncompressed_buffer_bytes_remaining + 5 > zip->uncompressed_buffer_size) break; if (zip->pack_stream_inbytes_remaining == 0 && zip->folder_outbytes_remaining == 0) break; if (end_of_data || (bytes_in == 0 && bytes_out == 0)) { archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive"); return (ARCHIVE_FATAL); } read_consume(a); } if (zip->uncompressed_buffer_bytes_remaining < minimum) { archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive"); return (ARCHIVE_FATAL); } zip->uncompressed_buffer_pointer = zip->uncompressed_buffer; return (ARCHIVE_OK); } static int seek_pack(struct archive_read *a) { struct _7zip *zip = (struct _7zip *)a->format->data; int64_t pack_offset; if (zip->pack_stream_remaining <= 0) { archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "Damaged 7-Zip archive"); return (ARCHIVE_FATAL); } zip->pack_stream_inbytes_remaining = zip->si.pi.sizes[zip->pack_stream_index]; pack_offset = zip->si.pi.positions[zip->pack_stream_index]; if (zip->stream_offset != pack_offset) { if (0 > __archive_read_seek(a, pack_offset + zip->seek_base, SEEK_SET)) return (ARCHIVE_FATAL); zip->stream_offset = pack_offset; } zip->pack_stream_index++; zip->pack_stream_remaining--; return (ARCHIVE_OK); } static ssize_t read_stream(struct archive_read *a, const void **buff, size_t size, size_t minimum) { struct _7zip *zip = (struct _7zip *)a->format->data; uint64_t skip_bytes = 0; ssize_t r; if (zip->uncompressed_buffer_bytes_remaining == 0) { if (zip->pack_stream_inbytes_remaining > 0) { r = extract_pack_stream(a, 0); if (r < 0) return (r); return (get_uncompressed_data(a, buff, size, minimum)); } else if (zip->folder_outbytes_remaining > 0) { /* Extract a remaining pack stream. */ r = extract_pack_stream(a, 0); if (r < 0) return (r); return (get_uncompressed_data(a, buff, size, minimum)); } } else return (get_uncompressed_data(a, buff, size, minimum)); /* * Current pack stream has been consumed. */ if (zip->pack_stream_remaining == 0) { if (zip->header_is_being_read) { /* Invalid sequence. This might happen when * reading a malformed archive. */ archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "Malformed 7-Zip archive"); return (ARCHIVE_FATAL); } /* * All current folder's pack streams have been * consumed. Switch to next folder. */ if (zip->folder_index == 0 && (zip->si.ci.folders[zip->entry->folderIndex].skipped_bytes || zip->folder_index != zip->entry->folderIndex)) { zip->folder_index = zip->entry->folderIndex; skip_bytes = zip->si.ci.folders[zip->folder_index].skipped_bytes; } if (zip->folder_index >= zip->si.ci.numFolders) { /* * We have consumed all folders and its pack streams. */ *buff = NULL; return (0); } r = setup_decode_folder(a, &(zip->si.ci.folders[zip->folder_index]), 0); if (r != ARCHIVE_OK) return (ARCHIVE_FATAL); zip->folder_index++; } /* * Switch to next pack stream. */ r = seek_pack(a); if (r < 0) return (r); /* Extract a new pack stream. */ r = extract_pack_stream(a, 0); if (r < 0) return (r); /* * Skip the bytes we already has skipped in skip_stream(). */ while (skip_bytes) { ssize_t skipped; if (zip->uncompressed_buffer_bytes_remaining == 0) { if (zip->pack_stream_inbytes_remaining > 0) { r = extract_pack_stream(a, 0); if (r < 0) return (r); } else if (zip->folder_outbytes_remaining > 0) { /* Extract a remaining pack stream. */ r = extract_pack_stream(a, 0); if (r < 0) return (r); } else { archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Truncated 7-Zip file body"); return (ARCHIVE_FATAL); } } skipped = get_uncompressed_data( a, buff, (size_t)skip_bytes, 0); if (skipped < 0) return (skipped); skip_bytes -= skipped; if (zip->pack_stream_bytes_unconsumed) read_consume(a); } return (get_uncompressed_data(a, buff, size, minimum)); } static int setup_decode_folder(struct archive_read *a, struct _7z_folder *folder, int header) { struct _7zip *zip = (struct _7zip *)a->format->data; const struct _7z_coder *coder1, *coder2; const char *cname = (header)?"archive header":"file content"; unsigned i; int r, found_bcj2 = 0; /* * Release the memory which the previous folder used for BCJ2. */ for (i = 0; i < 3; i++) { free(zip->sub_stream_buff[i]); zip->sub_stream_buff[i] = NULL; } /* * Initialize a stream reader. */ zip->pack_stream_remaining = (unsigned)folder->numPackedStreams; zip->pack_stream_index = (unsigned)folder->packIndex; zip->folder_outbytes_remaining = folder_uncompressed_size(folder); zip->uncompressed_buffer_bytes_remaining = 0; /* * Check coder types. */ for (i = 0; i < folder->numCoders; i++) { switch(folder->coders[i].codec) { case _7Z_CRYPTO_MAIN_ZIP: case _7Z_CRYPTO_RAR_29: case _7Z_CRYPTO_AES_256_SHA_256: { /* For entry that is associated with this folder, mark it as encrypted (data+metadata). */ zip->has_encrypted_entries = 1; if (a->entry) { archive_entry_set_is_data_encrypted(a->entry, 1); archive_entry_set_is_metadata_encrypted(a->entry, 1); } archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "The %s is encrypted, " "but currently not supported", cname); return (ARCHIVE_FATAL); } case _7Z_X86_BCJ2: { found_bcj2++; break; } } } /* Now that we've checked for encryption, if there were still no * encrypted entries found we can say for sure that there are none. */ if (zip->has_encrypted_entries == ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) { zip->has_encrypted_entries = 0; } if ((folder->numCoders > 2 && !found_bcj2) || found_bcj2 > 1) { archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "The %s is encoded with many filters, " "but currently not supported", cname); return (ARCHIVE_FATAL); } coder1 = &(folder->coders[0]); if (folder->numCoders == 2) coder2 = &(folder->coders[1]); else coder2 = NULL; if (found_bcj2) { /* * Preparation to decode BCJ2. * Decoding BCJ2 requires four sources. Those are at least, * as far as I know, two types of the storage form. */ const struct _7z_coder *fc = folder->coders; static const struct _7z_coder coder_copy = {0, 1, 1, 0, NULL}; const struct _7z_coder *scoder[3] = {&coder_copy, &coder_copy, &coder_copy}; const void *buff; ssize_t bytes; unsigned char *b[3] = {NULL, NULL, NULL}; uint64_t sunpack[3] ={-1, -1, -1}; size_t s[3] = {0, 0, 0}; int idx[3] = {0, 1, 2}; if (folder->numCoders == 4 && fc[3].codec == _7Z_X86_BCJ2 && folder->numInStreams == 7 && folder->numOutStreams == 4 && zip->pack_stream_remaining == 4) { /* Source type 1 made by 7zr or 7z with -m options. */ if (folder->bindPairs[0].inIndex == 5) { /* The form made by 7zr */ idx[0] = 1; idx[1] = 2; idx[2] = 0; scoder[1] = &(fc[1]); scoder[2] = &(fc[0]); sunpack[1] = folder->unPackSize[1]; sunpack[2] = folder->unPackSize[0]; coder1 = &(fc[2]); } else { /* * NOTE: Some patterns do not work. * work: * 7z a -m0=BCJ2 -m1=COPY -m2=COPY * -m3=(any) * 7z a -m0=BCJ2 -m1=COPY -m2=(any) * -m3=COPY * 7z a -m0=BCJ2 -m1=(any) -m2=COPY * -m3=COPY * not work: * other patterns. * * We have to handle this like `pipe' or * our libarchive7s filter frame work, * decoding the BCJ2 main stream sequentially, * m3 -> m2 -> m1 -> BCJ2. * */ if (fc[0].codec == _7Z_COPY && fc[1].codec == _7Z_COPY) coder1 = &(folder->coders[2]); else if (fc[0].codec == _7Z_COPY && fc[2].codec == _7Z_COPY) coder1 = &(folder->coders[1]); else if (fc[1].codec == _7Z_COPY && fc[2].codec == _7Z_COPY) coder1 = &(folder->coders[0]); else { archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "Unsupported form of " "BCJ2 streams"); return (ARCHIVE_FATAL); } } coder2 = &(fc[3]); zip->main_stream_bytes_remaining = (size_t)folder->unPackSize[2]; } else if (coder2 != NULL && coder2->codec == _7Z_X86_BCJ2 && zip->pack_stream_remaining == 4 && folder->numInStreams == 5 && folder->numOutStreams == 2) { /* Source type 0 made by 7z */ zip->main_stream_bytes_remaining = (size_t)folder->unPackSize[0]; } else { /* We got an unexpected form. */ archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC, "Unsupported form of BCJ2 streams"); return (ARCHIVE_FATAL); } /* Skip the main stream at this time. */ if ((r = seek_pack(a)) < 0) return (r); zip->pack_stream_bytes_unconsumed = (size_t)zip->pack_stream_inbytes_remaining; read_consume(a); /* Read following three sub streams. */ for (i = 0; i < 3; i++) { const struct _7z_coder *coder = scoder[i]; if ((r = seek_pack(a)) < 0) { free(b[0]); free(b[1]); free(b[2]); return (r); } if (sunpack[i] == (uint64_t)-1) zip->folder_outbytes_remaining = zip->pack_stream_inbytes_remaining; else zip->folder_outbytes_remaining = sunpack[i]; r = init_decompression(a, zip, coder, NULL); if (r != ARCHIVE_OK) { free(b[0]); free(b[1]); free(b[2]); return (ARCHIVE_FATAL); } /* Allocate memory for the decoded data of a sub * stream. */ b[i] = malloc((size_t)zip->folder_outbytes_remaining); if (b[i] == NULL) { free(b[0]); free(b[1]); free(b[2]); archive_set_error(&a->archive, ENOMEM, "No memory for 7-Zip decompression"); return (ARCHIVE_FATAL); } /* Extract a sub stream. */ while (zip->pack_stream_inbytes_remaining > 0) { r = (int)extract_pack_stream(a, 0); if (r < 0) { free(b[0]); free(b[1]); free(b[2]); return (r); } bytes = get_uncompressed_data(a, &buff, zip->uncompressed_buffer_bytes_remaining, 0); if (bytes < 0) { free(b[0]); free(b[1]); free(b[2]); return ((int)bytes); } memcpy(b[i]+s[i], buff, bytes); s[i] += bytes; if (zip->pack_stream_bytes_unconsumed) read_consume(a); } } /* Set the sub streams to the right place. */ for (i = 0; i < 3; i++) { zip->sub_stream_buff[i] = b[idx[i]]; zip->sub_stream_size[i] = s[idx[i]]; zip->sub_stream_bytes_remaining[i] = s[idx[i]]; } /* Allocate memory used for decoded main stream bytes. */ if (zip->tmp_stream_buff == NULL) { zip->tmp_stream_buff_size = 32 * 1024; zip->tmp_stream_buff = malloc(zip->tmp_stream_buff_size); if (zip->tmp_stream_buff == NULL) { archive_set_error(&a->archive, ENOMEM, "No memory for 7-Zip decompression"); return (ARCHIVE_FATAL); } } zip->tmp_stream_bytes_avail = 0; zip->tmp_stream_bytes_remaining = 0; zip->odd_bcj_size = 0; zip->bcj2_outPos = 0; /* * Reset a stream reader in order to read the main stream * of BCJ2. */ zip->pack_stream_remaining = 1; zip->pack_stream_index = (unsigned)folder->packIndex; zip->folder_outbytes_remaining = folder_uncompressed_size(folder); zip->uncompressed_buffer_bytes_remaining = 0; } /* * Initialize the decompressor for the new folder's pack streams. */ r = init_decompression(a, zip, coder1, coder2); if (r != ARCHIVE_OK) return (ARCHIVE_FATAL); return (ARCHIVE_OK); } static int64_t skip_stream(struct archive_read *a, size_t skip_bytes) { struct _7zip *zip = (struct _7zip *)a->format->data; const void *p; int64_t skipped_bytes; size_t bytes = skip_bytes; if (zip->folder_index == 0) { /* * Optimization for a list mode. * Avoid unnecessary decoding operations. */ zip->si.ci.folders[zip->entry->folderIndex].skipped_bytes += skip_bytes; return (skip_bytes); } while (bytes) { skipped_bytes = read_stream(a, &p, bytes, 0); if (skipped_bytes < 0) return (skipped_bytes); if (skipped_bytes == 0) { archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Truncated 7-Zip file body"); return (ARCHIVE_FATAL); } bytes -= (size_t)skipped_bytes; if (zip->pack_stream_bytes_unconsumed) read_consume(a); } return (skip_bytes); } /* * Brought from LZMA SDK. * * Bra86.c -- Converter for x86 code (BCJ) * 2008-10-04 : Igor Pavlov : Public domain * */ #define Test86MSByte(b) ((b) == 0 || (b) == 0xFF) static void x86_Init(struct _7zip *zip) { zip->bcj_state = 0; zip->bcj_prevPosT = (size_t)0 - 1; zip->bcj_prevMask = 0; zip->bcj_ip = 5; } static size_t x86_Convert(struct _7zip *zip, uint8_t *data, size_t size) { static const uint8_t kMaskToAllowedStatus[8] = {1, 1, 1, 0, 1, 0, 0, 0}; static const uint8_t kMaskToBitNumber[8] = {0, 1, 2, 2, 3, 3, 3, 3}; size_t bufferPos, prevPosT; uint32_t ip, prevMask; if (size < 5) return 0; bufferPos = 0; prevPosT = zip->bcj_prevPosT; prevMask = zip->bcj_prevMask; ip = zip->bcj_ip; for (;;) { uint8_t *p = data + bufferPos; uint8_t *limit = data + size - 4; for (; p < limit; p++) if ((*p & 0xFE) == 0xE8) break; bufferPos = (size_t)(p - data); if (p >= limit) break; prevPosT = bufferPos - prevPosT; if (prevPosT > 3) prevMask = 0; else { prevMask = (prevMask << ((int)prevPosT - 1)) & 0x7; if (prevMask != 0) { unsigned char b = p[4 - kMaskToBitNumber[prevMask]]; if (!kMaskToAllowedStatus[prevMask] || Test86MSByte(b)) { prevPosT = bufferPos; prevMask = ((prevMask << 1) & 0x7) | 1; bufferPos++; continue; } } } prevPosT = bufferPos; if (Test86MSByte(p[4])) { uint32_t src = ((uint32_t)p[4] << 24) | ((uint32_t)p[3] << 16) | ((uint32_t)p[2] << 8) | ((uint32_t)p[1]); uint32_t dest; for (;;) { uint8_t b; int b_index; dest = src - (ip + (uint32_t)bufferPos); if (prevMask == 0) break; b_index = kMaskToBitNumber[prevMask] * 8; b = (uint8_t)(dest >> (24 - b_index)); if (!Test86MSByte(b)) break; src = dest ^ ((1 << (32 - b_index)) - 1); } p[4] = (uint8_t)(~(((dest >> 24) & 1) - 1)); p[3] = (uint8_t)(dest >> 16); p[2] = (uint8_t)(dest >> 8); p[1] = (uint8_t)dest; bufferPos += 5; } else { prevMask = ((prevMask << 1) & 0x7) | 1; bufferPos++; } } zip->bcj_prevPosT = prevPosT; zip->bcj_prevMask = prevMask; zip->bcj_ip += (uint32_t)bufferPos; return (bufferPos); } /* * Brought from LZMA SDK. * * Bcj2.c -- Converter for x86 code (BCJ2) * 2008-10-04 : Igor Pavlov : Public domain * */ #define SZ_ERROR_DATA ARCHIVE_FAILED #define IsJcc(b0, b1) ((b0) == 0x0F && ((b1) & 0xF0) == 0x80) #define IsJ(b0, b1) ((b1 & 0xFE) == 0xE8 || IsJcc(b0, b1)) #define kNumTopBits 24 #define kTopValue ((uint32_t)1 << kNumTopBits) #define kNumBitModelTotalBits 11 #define kBitModelTotal (1 << kNumBitModelTotalBits) #define kNumMoveBits 5 #define RC_READ_BYTE (*buffer++) #define RC_TEST { if (buffer == bufferLim) return SZ_ERROR_DATA; } #define RC_INIT2 zip->bcj2_code = 0; zip->bcj2_range = 0xFFFFFFFF; \ { int ii; for (ii = 0; ii < 5; ii++) { RC_TEST; zip->bcj2_code = (zip->bcj2_code << 8) | RC_READ_BYTE; }} #define NORMALIZE if (zip->bcj2_range < kTopValue) { RC_TEST; zip->bcj2_range <<= 8; zip->bcj2_code = (zip->bcj2_code << 8) | RC_READ_BYTE; } #define IF_BIT_0(p) ttt = *(p); bound = (zip->bcj2_range >> kNumBitModelTotalBits) * ttt; if (zip->bcj2_code < bound) #define UPDATE_0(p) zip->bcj2_range = bound; *(p) = (CProb)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits)); NORMALIZE; #define UPDATE_1(p) zip->bcj2_range -= bound; zip->bcj2_code -= bound; *(p) = (CProb)(ttt - (ttt >> kNumMoveBits)); NORMALIZE; static ssize_t Bcj2_Decode(struct _7zip *zip, uint8_t *outBuf, size_t outSize) { size_t inPos = 0, outPos = 0; const uint8_t *buf0, *buf1, *buf2, *buf3; size_t size0, size1, size2, size3; const uint8_t *buffer, *bufferLim; unsigned int i, j; size0 = zip->tmp_stream_bytes_remaining; buf0 = zip->tmp_stream_buff + zip->tmp_stream_bytes_avail - size0; size1 = zip->sub_stream_bytes_remaining[0]; buf1 = zip->sub_stream_buff[0] + zip->sub_stream_size[0] - size1; size2 = zip->sub_stream_bytes_remaining[1]; buf2 = zip->sub_stream_buff[1] + zip->sub_stream_size[1] - size2; size3 = zip->sub_stream_bytes_remaining[2]; buf3 = zip->sub_stream_buff[2] + zip->sub_stream_size[2] - size3; buffer = buf3; bufferLim = buffer + size3; if (zip->bcj_state == 0) { /* * Initialize. */ zip->bcj2_prevByte = 0; for (i = 0; i < sizeof(zip->bcj2_p) / sizeof(zip->bcj2_p[0]); i++) zip->bcj2_p[i] = kBitModelTotal >> 1; RC_INIT2; zip->bcj_state = 1; } /* * Gather the odd bytes of a previous call. */ for (i = 0; zip->odd_bcj_size > 0 && outPos < outSize; i++) { outBuf[outPos++] = zip->odd_bcj[i]; zip->odd_bcj_size--; } if (outSize == 0) { zip->bcj2_outPos += outPos; return (outPos); } for (;;) { uint8_t b; CProb *prob; uint32_t bound; uint32_t ttt; size_t limit = size0 - inPos; if (outSize - outPos < limit) limit = outSize - outPos; if (zip->bcj_state == 1) { while (limit != 0) { uint8_t bb = buf0[inPos]; outBuf[outPos++] = bb; if (IsJ(zip->bcj2_prevByte, bb)) { zip->bcj_state = 2; break; } inPos++; zip->bcj2_prevByte = bb; limit--; } } if (limit == 0 || outPos == outSize) break; zip->bcj_state = 1; b = buf0[inPos++]; if (b == 0xE8) prob = zip->bcj2_p + zip->bcj2_prevByte; else if (b == 0xE9) prob = zip->bcj2_p + 256; else prob = zip->bcj2_p + 257; IF_BIT_0(prob) { UPDATE_0(prob) zip->bcj2_prevByte = b; } else { uint32_t dest; const uint8_t *v; uint8_t out[4]; UPDATE_1(prob) if (b == 0xE8) { v = buf1; if (size1 < 4) return SZ_ERROR_DATA; buf1 += 4; size1 -= 4; } else { v = buf2; if (size2 < 4) return SZ_ERROR_DATA; buf2 += 4; size2 -= 4; } dest = (((uint32_t)v[0] << 24) | ((uint32_t)v[1] << 16) | ((uint32_t)v[2] << 8) | ((uint32_t)v[3])) - ((uint32_t)zip->bcj2_outPos + (uint32_t)outPos + 4); out[0] = (uint8_t)dest; out[1] = (uint8_t)(dest >> 8); out[2] = (uint8_t)(dest >> 16); out[3] = zip->bcj2_prevByte = (uint8_t)(dest >> 24); for (i = 0; i < 4 && outPos < outSize; i++) outBuf[outPos++] = out[i]; if (i < 4) { /* * Save odd bytes which we could not add into * the output buffer because of out of space. */ zip->odd_bcj_size = 4 -i; for (; i < 4; i++) { j = i - 4 + (unsigned)zip->odd_bcj_size; zip->odd_bcj[j] = out[i]; } break; } } } zip->tmp_stream_bytes_remaining -= inPos; zip->sub_stream_bytes_remaining[0] = size1; zip->sub_stream_bytes_remaining[1] = size2; zip->sub_stream_bytes_remaining[2] = bufferLim - buffer; zip->bcj2_outPos += outPos; return ((ssize_t)outPos); }