2 * Copyright (c) 2004-2013 Tim Kientzle
3 * Copyright (c) 2011-2012,2014 Michihiro NAKAJIMA
4 * Copyright (c) 2013 Konrad Kleine
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include "archive_platform.h"
29 __FBSDID("$FreeBSD$");
32 * The definitive documentation of the Zip file format is:
33 * http://www.pkware.com/documents/casestudies/APPNOTE.TXT
35 * The Info-Zip project has pioneered various extensions to better
36 * support Zip on Unix, including the 0x5455 "UT", 0x5855 "UX", 0x7855
37 * "Ux", and 0x7875 "ux" extensions for time and ownership
40 * History of this code: The streaming Zip reader was first added to
41 * libarchive in January 2005. Support for seekable input sources was
42 * added in Nov 2011. Zip64 support (including a significant code
43 * refactoring) was added in 2014.
57 #include "archive_digest_private.h"
58 #include "archive_cryptor_private.h"
59 #include "archive_endian.h"
60 #include "archive_entry.h"
61 #include "archive_entry_locale.h"
62 #include "archive_hmac_private.h"
63 #include "archive_private.h"
64 #include "archive_rb.h"
65 #include "archive_read_private.h"
68 #include "archive_crc32.h"
72 struct archive_rb_node node;
73 struct zip_entry *next;
74 int64_t local_header_offset;
75 int64_t compressed_size;
76 int64_t uncompressed_size;
79 struct archive_string rsrcname;
85 uint16_t zip_flags; /* From GP Flags Field */
86 unsigned char compression;
87 unsigned char system; /* From "version written by" */
88 unsigned char flags; /* Our extra markers. */
89 unsigned char decdat;/* Used for Decryption check */
91 /* WinZip AES encryption extra field should be available
92 * when compression is 99. */
94 /* Vendor version: AE-1 - 0x0001, AE-2 - 0x0002 */
96 #define AES_VENDOR_AE_1 0x0001
97 #define AES_VENDOR_AE_2 0x0002
98 /* AES encryption strength:
99 * 1 - 128 bits, 2 - 192 bits, 2 - 256 bits. */
101 /* Actual compression method. */
102 unsigned char compression;
106 struct trad_enc_ctx {
110 /* Bits used in zip_flags. */
111 #define ZIP_ENCRYPTED (1 << 0)
112 #define ZIP_LENGTH_AT_END (1 << 3)
113 #define ZIP_STRONG_ENCRYPTED (1 << 6)
114 #define ZIP_UTF8_NAME (1 << 11)
115 /* See "7.2 Single Password Symmetric Encryption Method"
116 in http://www.pkware.com/documents/casestudies/APPNOTE.TXT */
117 #define ZIP_CENTRAL_DIRECTORY_ENCRYPTED (1 << 13)
119 /* Bits used in flags. */
120 #define LA_USED_ZIP64 (1 << 0)
121 #define LA_FROM_CENTRAL_DIRECTORY (1 << 1)
124 * See "WinZip - AES Encryption Information"
125 * http://www.winzip.com/aes_info.htm
127 /* Value used in compression method. */
128 #define WINZIP_AES_ENCRYPTION 99
129 /* Authentication code size. */
130 #define AUTH_CODE_SIZE 10
132 #define MAX_DERIVED_KEY_BUF_SIZE (AES_MAX_KEY_SIZE * 2 + 2)
135 /* Structural information about the archive. */
136 struct archive_string format_name;
137 int64_t central_directory_offset;
138 size_t central_directory_entries_total;
139 size_t central_directory_entries_on_this_disk;
140 int has_encrypted_entries;
142 /* List of entries (seekable Zip only) */
143 struct zip_entry *zip_entries;
144 struct archive_rb_tree tree;
145 struct archive_rb_tree tree_rsrc;
147 /* Bytes read but not yet consumed via __archive_read_consume() */
150 /* Information about entry we're currently reading. */
151 struct zip_entry *entry;
152 int64_t entry_bytes_remaining;
154 /* These count the number of bytes actually read for the entry. */
155 int64_t entry_compressed_bytes_read;
156 int64_t entry_uncompressed_bytes_read;
158 /* Running CRC32 of the decompressed data */
159 unsigned long entry_crc32;
160 unsigned long (*crc32func)(unsigned long, const void *,
164 /* Flags to mark progress of decompression. */
165 char decompress_init;
169 unsigned char *uncompressed_buffer;
170 size_t uncompressed_buffer_size;
175 struct archive_string_conv *sconv;
176 struct archive_string_conv *sconv_default;
177 struct archive_string_conv *sconv_utf8;
178 int init_default_conversion;
179 int process_mac_extensions;
181 char init_decryption;
183 /* Decryption buffer. */
185 * The decrypted data starts at decrypted_ptr and
186 * extends for decrypted_bytes_remaining. Decryption
187 * adds new data to the end of this block, data is returned
188 * to clients from the beginning. When the block hits the
189 * end of decrypted_buffer, it has to be shuffled back to
190 * the beginning of the buffer.
192 unsigned char *decrypted_buffer;
193 unsigned char *decrypted_ptr;
194 size_t decrypted_buffer_size;
195 size_t decrypted_bytes_remaining;
196 size_t decrypted_unconsumed_bytes;
198 /* Traditional PKWARE decryption. */
199 struct trad_enc_ctx tctx;
202 /* WinZip AES decryption. */
203 /* Contexts used for AES decryption. */
204 archive_crypto_ctx cctx;
206 archive_hmac_sha1_ctx hctx;
209 /* Strong encryption's decryption header information. */
222 /* Many systems define min or MIN, but not all. */
223 #define zipmin(a,b) ((a) < (b) ? (a) : (b))
225 /* ------------------------------------------------------------------------ */
228 Traditional PKWARE Decryption functions.
232 trad_enc_update_keys(struct trad_enc_ctx *ctx, uint8_t c)
235 #define CRC32(c, b) (crc32(c ^ 0xffffffffUL, &b, 1) ^ 0xffffffffUL)
237 ctx->keys[0] = CRC32(ctx->keys[0], c);
238 ctx->keys[1] = (ctx->keys[1] + (ctx->keys[0] & 0xff)) * 134775813L + 1;
239 t = (ctx->keys[1] >> 24) & 0xff;
240 ctx->keys[2] = CRC32(ctx->keys[2], t);
245 trad_enc_decrypt_byte(struct trad_enc_ctx *ctx)
247 unsigned temp = ctx->keys[2] | 2;
248 return (uint8_t)((temp * (temp ^ 1)) >> 8) & 0xff;
252 trad_enc_decrypt_update(struct trad_enc_ctx *ctx, const uint8_t *in,
253 size_t in_len, uint8_t *out, size_t out_len)
257 max = (unsigned)((in_len < out_len)? in_len: out_len);
259 for (i = 0; i < max; i++) {
260 uint8_t t = in[i] ^ trad_enc_decrypt_byte(ctx);
262 trad_enc_update_keys(ctx, t);
267 trad_enc_init(struct trad_enc_ctx *ctx, const char *pw, size_t pw_len,
268 const uint8_t *key, size_t key_len, uint8_t *crcchk)
277 ctx->keys[0] = 305419896L;
278 ctx->keys[1] = 591751049L;
279 ctx->keys[2] = 878082192L;
281 for (;pw_len; --pw_len)
282 trad_enc_update_keys(ctx, *pw++);
284 trad_enc_decrypt_update(ctx, key, 12, header, 12);
285 /* Return the last byte for CRC check. */
286 *crcchk = header[11];
292 crypt_derive_key_sha1(const void *p, int size, unsigned char *key,
296 archive_sha1_ctx ctx;
297 unsigned char md1[MD_SIZE];
298 unsigned char md2[MD_SIZE * 2];
299 unsigned char mkb[64];
302 archive_sha1_init(&ctx);
303 archive_sha1_update(&ctx, p, size);
304 archive_sha1_final(&ctx, md1);
306 memset(mkb, 0x36, sizeof(mkb));
307 for (i = 0; i < MD_SIZE; i++)
309 archive_sha1_init(&ctx);
310 archive_sha1_update(&ctx, mkb, sizeof(mkb));
311 archive_sha1_final(&ctx, md2);
313 memset(mkb, 0x5C, sizeof(mkb));
314 for (i = 0; i < MD_SIZE; i++)
316 archive_sha1_init(&ctx);
317 archive_sha1_update(&ctx, mkb, sizeof(mkb));
318 archive_sha1_final(&ctx, md2 + MD_SIZE);
322 memcpy(key, md2, key_size);
328 * Common code for streaming or seeking modes.
330 * Includes code to read local file headers, decompress data
331 * from entry bodies, and common API.
335 real_crc32(unsigned long crc, const void *buff, size_t len)
337 return crc32(crc, buff, (unsigned int)len);
340 /* Used by "ignorecrc32" option to speed up tests. */
342 fake_crc32(unsigned long crc, const void *buff, size_t len)
344 (void)crc; /* UNUSED */
345 (void)buff; /* UNUSED */
346 (void)len; /* UNUSED */
350 static const struct {
353 } compression_methods[] = {
354 {0, "uncompressed"}, /* The file is stored (no compression) */
355 {1, "shrinking"}, /* The file is Shrunk */
356 {2, "reduced-1"}, /* The file is Reduced with compression factor 1 */
357 {3, "reduced-2"}, /* The file is Reduced with compression factor 2 */
358 {4, "reduced-3"}, /* The file is Reduced with compression factor 3 */
359 {5, "reduced-4"}, /* The file is Reduced with compression factor 4 */
360 {6, "imploded"}, /* The file is Imploded */
361 {7, "reserved"}, /* Reserved for Tokenizing compression algorithm */
362 {8, "deflation"}, /* The file is Deflated */
363 {9, "deflation-64-bit"}, /* Enhanced Deflating using Deflate64(tm) */
364 {10, "ibm-terse"},/* PKWARE Data Compression Library Imploding
366 {11, "reserved"}, /* Reserved by PKWARE */
367 {12, "bzip"}, /* File is compressed using BZIP2 algorithm */
368 {13, "reserved"}, /* Reserved by PKWARE */
369 {14, "lzma"}, /* LZMA (EFS) */
370 {15, "reserved"}, /* Reserved by PKWARE */
371 {16, "reserved"}, /* Reserved by PKWARE */
372 {17, "reserved"}, /* Reserved by PKWARE */
373 {18, "ibm-terse-new"}, /* File is compressed using IBM TERSE (new) */
374 {19, "ibm-lz777"},/* IBM LZ77 z Architecture (PFS) */
375 {97, "wav-pack"}, /* WavPack compressed data */
376 {98, "ppmd-1"}, /* PPMd version I, Rev 1 */
377 {99, "aes"} /* WinZip AES encryption */
381 compression_name(const int compression)
383 static const int num_compression_methods =
384 sizeof(compression_methods)/sizeof(compression_methods[0]);
387 while(compression >= 0 && i < num_compression_methods) {
388 if (compression_methods[i].id == compression)
389 return compression_methods[i].name;
395 /* Convert an MSDOS-style date/time into Unix-style time. */
397 zip_time(const char *p)
402 msTime = (0xff & (unsigned)p[0]) + 256 * (0xff & (unsigned)p[1]);
403 msDate = (0xff & (unsigned)p[2]) + 256 * (0xff & (unsigned)p[3]);
405 memset(&ts, 0, sizeof(ts));
406 ts.tm_year = ((msDate >> 9) & 0x7f) + 80; /* Years since 1900. */
407 ts.tm_mon = ((msDate >> 5) & 0x0f) - 1; /* Month number. */
408 ts.tm_mday = msDate & 0x1f; /* Day of month. */
409 ts.tm_hour = (msTime >> 11) & 0x1f;
410 ts.tm_min = (msTime >> 5) & 0x3f;
411 ts.tm_sec = (msTime << 1) & 0x3e;
417 * The extra data is stored as a list of
418 * id1+size1+data1 + id2+size2+data2 ...
419 * triplets. id and size are 2 bytes each.
422 process_extra(struct archive_read *a, const char *p, size_t extra_length, struct zip_entry* zip_entry)
426 if (extra_length == 0) {
430 if (extra_length < 4) {
431 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
432 "Too-small extra data: Need at least 4 bytes, but only found %d bytes", (int)extra_length);
433 return ARCHIVE_FAILED;
435 while (offset <= extra_length - 4) {
436 unsigned short headerid = archive_le16dec(p + offset);
437 unsigned short datasize = archive_le16dec(p + offset + 2);
440 if (offset + datasize > extra_length) {
441 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
442 "Extra data overflow: Need %d bytes but only found %d bytes",
443 (int)datasize, (int)(extra_length - offset));
444 return ARCHIVE_FAILED;
447 fprintf(stderr, "Header id 0x%04x, length %d\n",
452 /* Zip64 extended information extra field. */
453 zip_entry->flags |= LA_USED_ZIP64;
454 if (zip_entry->uncompressed_size == 0xffffffff) {
457 || (t = archive_le64dec(p + offset)) > INT64_MAX) {
458 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
459 "Malformed 64-bit uncompressed size");
460 return ARCHIVE_FAILED;
462 zip_entry->uncompressed_size = t;
466 if (zip_entry->compressed_size == 0xffffffff) {
469 || (t = archive_le64dec(p + offset)) > INT64_MAX) {
470 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
471 "Malformed 64-bit compressed size");
472 return ARCHIVE_FAILED;
474 zip_entry->compressed_size = t;
478 if (zip_entry->local_header_offset == 0xffffffff) {
481 || (t = archive_le64dec(p + offset)) > INT64_MAX) {
482 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
483 "Malformed 64-bit local header offset");
484 return ARCHIVE_FAILED;
486 zip_entry->local_header_offset = t;
490 /* archive_le32dec(p + offset) gives disk
491 * on which file starts, but we don't handle
492 * multi-volume Zip files. */
497 /* Strong encryption field. */
498 if (archive_le16dec(p + offset) == 2) {
500 archive_le16dec(p + offset + 2);
502 archive_le16dec(p + offset + 4);
504 archive_le16dec(p + offset + 6);
505 fprintf(stderr, "algId=0x%04x, bitLen=%u, "
506 "flgas=%d\n", algId, bitLen,flags);
513 /* Extended time field "UT". */
514 int flags = p[offset];
517 /* Flag bits indicate which dates are present. */
521 fprintf(stderr, "mtime: %lld -> %d\n",
522 (long long)zip_entry->mtime,
523 archive_le32dec(p + offset));
527 zip_entry->mtime = archive_le32dec(p + offset);
535 zip_entry->atime = archive_le32dec(p + offset);
543 zip_entry->ctime = archive_le32dec(p + offset);
551 /* Info-ZIP Unix Extra Field (old version) "UX". */
553 zip_entry->atime = archive_le32dec(p + offset);
555 archive_le32dec(p + offset + 4);
557 if (datasize >= 12) {
559 archive_le16dec(p + offset + 8);
561 archive_le16dec(p + offset + 10);
567 /* Experimental 'xl' field */
569 * Introduced Dec 2013 to provide a way to
570 * include external file attributes (and other
571 * fields that ordinarily appear only in
572 * central directory) in local file header.
573 * This provides file type and permission
574 * information necessary to support full
575 * streaming extraction. Currently being
576 * discussed with other Zip developers
577 * ... subject to change.
580 * The field starts with a bitmap that specifies
581 * which additional fields are included. The
582 * bitmap is variable length and can be extended in
585 * n bytes - feature bitmap: first byte has low-order
586 * 7 bits. If high-order bit is set, a subsequent
587 * byte holds the next 7 bits, etc.
589 * if bitmap & 1, 2 byte "version made by"
590 * if bitmap & 2, 2 byte "internal file attributes"
591 * if bitmap & 4, 4 byte "external file attributes"
592 * if bitmap & 8, 2 byte comment length + n byte comment
594 int bitmap, bitmap_last;
598 bitmap_last = bitmap = 0xff & p[offset];
602 /* We only support first 7 bits of bitmap; skip rest. */
603 while ((bitmap_last & 0x80) != 0
605 bitmap_last = p[offset];
611 /* 2 byte "version made by" */
615 = archive_le16dec(p + offset) >> 8;
620 /* 2 byte "internal file attributes" */
621 uint32_t internal_attributes;
625 = archive_le16dec(p + offset);
626 /* Not used by libarchive at present. */
627 (void)internal_attributes; /* UNUSED */
632 /* 4 byte "external file attributes" */
633 uint32_t external_attributes;
637 = archive_le32dec(p + offset);
638 if (zip_entry->system == 3) {
640 = external_attributes >> 16;
641 } else if (zip_entry->system == 0) {
642 // Interpret MSDOS directory bit
643 if (0x10 == (external_attributes & 0x10)) {
644 zip_entry->mode = AE_IFDIR | 0775;
646 zip_entry->mode = AE_IFREG | 0664;
648 if (0x01 == (external_attributes & 0x01)) {
649 // Read-only bit; strip write permissions
650 zip_entry->mode &= 0555;
659 /* 2 byte comment length + comment */
660 uint32_t comment_length;
664 = archive_le16dec(p + offset);
668 if (datasize < comment_length)
670 /* Comment is not supported by libarchive */
671 offset += comment_length;
672 datasize -= comment_length;
677 /* Info-ZIP Unix Extra Field (type 2) "Ux". */
679 fprintf(stderr, "uid %d gid %d\n",
680 archive_le16dec(p + offset),
681 archive_le16dec(p + offset + 2));
684 zip_entry->uid = archive_le16dec(p + offset);
687 archive_le16dec(p + offset + 2);
691 /* Info-Zip Unix Extra Field (type 3) "ux". */
692 int uidsize = 0, gidsize = 0;
694 /* TODO: support arbitrary uidsize/gidsize. */
695 if (datasize >= 1 && p[offset] == 1) {/* version=1 */
697 /* get a uid size. */
698 uidsize = 0xff & (int)p[offset+1];
703 else if (uidsize == 4 && datasize >= 6)
708 if (datasize >= (2 + uidsize + 3)) {
709 /* get a gid size. */
710 gidsize = 0xff & (int)p[offset+2+uidsize];
714 p+offset+2+uidsize+1);
715 else if (gidsize == 4 &&
716 datasize >= (2 + uidsize + 5))
719 p+offset+2+uidsize+1);
725 /* WinZip AES extra data field. */
726 if (p[offset + 2] == 'A' && p[offset + 3] == 'E') {
727 /* Vendor version. */
728 zip_entry->aes_extra.vendor =
729 archive_le16dec(p + offset);
730 /* AES encryption strength. */
731 zip_entry->aes_extra.strength = p[offset + 4];
732 /* Actual compression method. */
733 zip_entry->aes_extra.compression =
742 if (offset != extra_length) {
743 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
744 "Malformed extra data: Consumed %d bytes of %d bytes",
745 (int)offset, (int)extra_length);
746 return ARCHIVE_FAILED;
752 * Assumes file pointer is at beginning of local file header.
755 zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry,
762 size_t len, filename_length, extra_length;
763 struct archive_string_conv *sconv;
764 struct zip_entry *zip_entry = zip->entry;
765 struct zip_entry zip_entry_central_dir;
766 int ret = ARCHIVE_OK;
769 /* Save a copy of the original for consistency checks. */
770 zip_entry_central_dir = *zip_entry;
772 zip->decompress_init = 0;
773 zip->end_of_entry = 0;
774 zip->entry_uncompressed_bytes_read = 0;
775 zip->entry_compressed_bytes_read = 0;
776 zip->entry_crc32 = zip->crc32func(0, NULL, 0);
778 /* Setup default conversion. */
779 if (zip->sconv == NULL && !zip->init_default_conversion) {
781 archive_string_default_conversion_for_read(&(a->archive));
782 zip->init_default_conversion = 1;
785 if ((p = __archive_read_ahead(a, 30, NULL)) == NULL) {
786 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
787 "Truncated ZIP file header");
788 return (ARCHIVE_FATAL);
791 if (memcmp(p, "PK\003\004", 4) != 0) {
792 archive_set_error(&a->archive, -1, "Damaged Zip archive");
793 return ARCHIVE_FATAL;
796 zip_entry->system = p[5];
797 zip_entry->zip_flags = archive_le16dec(p + 6);
798 if (zip_entry->zip_flags & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)) {
799 zip->has_encrypted_entries = 1;
800 archive_entry_set_is_data_encrypted(entry, 1);
801 if (zip_entry->zip_flags & ZIP_CENTRAL_DIRECTORY_ENCRYPTED &&
802 zip_entry->zip_flags & ZIP_ENCRYPTED &&
803 zip_entry->zip_flags & ZIP_STRONG_ENCRYPTED) {
804 archive_entry_set_is_metadata_encrypted(entry, 1);
805 return ARCHIVE_FATAL;
808 zip->init_decryption = (zip_entry->zip_flags & ZIP_ENCRYPTED);
809 zip_entry->compression = (char)archive_le16dec(p + 8);
810 zip_entry->mtime = zip_time(p + 10);
811 zip_entry->crc32 = archive_le32dec(p + 14);
812 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
813 zip_entry->decdat = p[11];
815 zip_entry->decdat = p[17];
816 zip_entry->compressed_size = archive_le32dec(p + 18);
817 zip_entry->uncompressed_size = archive_le32dec(p + 22);
818 filename_length = archive_le16dec(p + 26);
819 extra_length = archive_le16dec(p + 28);
821 __archive_read_consume(a, 30);
823 /* Read the filename. */
824 if ((h = __archive_read_ahead(a, filename_length, NULL)) == NULL) {
825 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
826 "Truncated ZIP file header");
827 return (ARCHIVE_FATAL);
829 if (zip_entry->zip_flags & ZIP_UTF8_NAME) {
830 /* The filename is stored to be UTF-8. */
831 if (zip->sconv_utf8 == NULL) {
833 archive_string_conversion_from_charset(
834 &a->archive, "UTF-8", 1);
835 if (zip->sconv_utf8 == NULL)
836 return (ARCHIVE_FATAL);
838 sconv = zip->sconv_utf8;
839 } else if (zip->sconv != NULL)
842 sconv = zip->sconv_default;
844 if (archive_entry_copy_pathname_l(entry,
845 h, filename_length, sconv) != 0) {
846 if (errno == ENOMEM) {
847 archive_set_error(&a->archive, ENOMEM,
848 "Can't allocate memory for Pathname");
849 return (ARCHIVE_FATAL);
851 archive_set_error(&a->archive,
852 ARCHIVE_ERRNO_FILE_FORMAT,
853 "Pathname cannot be converted "
854 "from %s to current locale.",
855 archive_string_conversion_charset_name(sconv));
858 __archive_read_consume(a, filename_length);
860 /* Read the extra data. */
861 if ((h = __archive_read_ahead(a, extra_length, NULL)) == NULL) {
862 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
863 "Truncated ZIP file header");
864 return (ARCHIVE_FATAL);
867 if (ARCHIVE_OK != process_extra(a, h, extra_length, zip_entry)) {
868 return ARCHIVE_FATAL;
870 __archive_read_consume(a, extra_length);
872 /* Work around a bug in Info-Zip: When reading from a pipe, it
873 * stats the pipe instead of synthesizing a file entry. */
874 if ((zip_entry->mode & AE_IFMT) == AE_IFIFO) {
875 zip_entry->mode &= ~ AE_IFMT;
876 zip_entry->mode |= AE_IFREG;
879 /* If the mode is totally empty, set some sane default. */
880 if (zip_entry->mode == 0) {
881 zip_entry->mode |= 0664;
884 /* Make sure that entries with a trailing '/' are marked as directories
885 * even if the External File Attributes contains bogus values. If this
886 * is not a directory and there is no type, assume regularfile. */
887 if ((zip_entry->mode & AE_IFMT) != AE_IFDIR) {
890 wp = archive_entry_pathname_w(entry);
893 has_slash = len > 0 && wp[len - 1] == L'/';
895 cp = archive_entry_pathname(entry);
896 len = (cp != NULL)?strlen(cp):0;
897 has_slash = len > 0 && cp[len - 1] == '/';
899 /* Correct file type as needed. */
901 zip_entry->mode &= ~AE_IFMT;
902 zip_entry->mode |= AE_IFDIR;
903 zip_entry->mode |= 0111;
904 } else if ((zip_entry->mode & AE_IFMT) == 0) {
905 zip_entry->mode |= AE_IFREG;
909 /* Make sure directories end in '/' */
910 if ((zip_entry->mode & AE_IFMT) == AE_IFDIR) {
911 wp = archive_entry_pathname_w(entry);
914 if (len > 0 && wp[len - 1] != L'/') {
915 struct archive_wstring s;
916 archive_string_init(&s);
917 archive_wstrcat(&s, wp);
918 archive_wstrappend_wchar(&s, L'/');
919 archive_entry_copy_pathname_w(entry, s.s);
920 archive_wstring_free(&s);
923 cp = archive_entry_pathname(entry);
924 len = (cp != NULL)?strlen(cp):0;
925 if (len > 0 && cp[len - 1] != '/') {
926 struct archive_string s;
927 archive_string_init(&s);
928 archive_strcat(&s, cp);
929 archive_strappend_char(&s, '/');
930 archive_entry_set_pathname(entry, s.s);
931 archive_string_free(&s);
936 if (zip_entry->flags & LA_FROM_CENTRAL_DIRECTORY) {
937 /* If this came from the central dir, it's size info
938 * is definitive, so ignore the length-at-end flag. */
939 zip_entry->zip_flags &= ~ZIP_LENGTH_AT_END;
940 /* If local header is missing a value, use the one from
941 the central directory. If both have it, warn about
943 if (zip_entry->crc32 == 0) {
944 zip_entry->crc32 = zip_entry_central_dir.crc32;
945 } else if (!zip->ignore_crc32
946 && zip_entry->crc32 != zip_entry_central_dir.crc32) {
947 archive_set_error(&a->archive,
948 ARCHIVE_ERRNO_FILE_FORMAT,
949 "Inconsistent CRC32 values");
952 if (zip_entry->compressed_size == 0) {
953 zip_entry->compressed_size
954 = zip_entry_central_dir.compressed_size;
955 } else if (zip_entry->compressed_size
956 != zip_entry_central_dir.compressed_size) {
957 archive_set_error(&a->archive,
958 ARCHIVE_ERRNO_FILE_FORMAT,
959 "Inconsistent compressed size: "
960 "%jd in central directory, %jd in local header",
961 (intmax_t)zip_entry_central_dir.compressed_size,
962 (intmax_t)zip_entry->compressed_size);
965 if (zip_entry->uncompressed_size == 0) {
966 zip_entry->uncompressed_size
967 = zip_entry_central_dir.uncompressed_size;
968 } else if (zip_entry->uncompressed_size
969 != zip_entry_central_dir.uncompressed_size) {
970 archive_set_error(&a->archive,
971 ARCHIVE_ERRNO_FILE_FORMAT,
972 "Inconsistent uncompressed size: "
973 "%jd in central directory, %jd in local header",
974 (intmax_t)zip_entry_central_dir.uncompressed_size,
975 (intmax_t)zip_entry->uncompressed_size);
980 /* Populate some additional entry fields: */
981 archive_entry_set_mode(entry, zip_entry->mode);
982 archive_entry_set_uid(entry, zip_entry->uid);
983 archive_entry_set_gid(entry, zip_entry->gid);
984 archive_entry_set_mtime(entry, zip_entry->mtime, 0);
985 archive_entry_set_ctime(entry, zip_entry->ctime, 0);
986 archive_entry_set_atime(entry, zip_entry->atime, 0);
988 if ((zip->entry->mode & AE_IFMT) == AE_IFLNK) {
989 size_t linkname_length;
991 if (zip_entry->compressed_size > 64 * 1024) {
992 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
993 "Zip file with oversized link entry");
994 return ARCHIVE_FATAL;
997 linkname_length = (size_t)zip_entry->compressed_size;
999 archive_entry_set_size(entry, 0);
1000 p = __archive_read_ahead(a, linkname_length, NULL);
1002 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1003 "Truncated Zip file");
1004 return ARCHIVE_FATAL;
1008 if (sconv == NULL && (zip->entry->zip_flags & ZIP_UTF8_NAME))
1009 sconv = zip->sconv_utf8;
1011 sconv = zip->sconv_default;
1012 if (archive_entry_copy_symlink_l(entry, p, linkname_length,
1014 if (errno != ENOMEM && sconv == zip->sconv_utf8 &&
1015 (zip->entry->zip_flags & ZIP_UTF8_NAME))
1016 archive_entry_copy_symlink_l(entry, p,
1017 linkname_length, NULL);
1018 if (errno == ENOMEM) {
1019 archive_set_error(&a->archive, ENOMEM,
1020 "Can't allocate memory for Symlink");
1021 return (ARCHIVE_FATAL);
1024 * Since there is no character-set regulation for
1025 * symlink name, do not report the conversion error
1026 * in an automatic conversion.
1028 if (sconv != zip->sconv_utf8 ||
1029 (zip->entry->zip_flags & ZIP_UTF8_NAME) == 0) {
1030 archive_set_error(&a->archive,
1031 ARCHIVE_ERRNO_FILE_FORMAT,
1032 "Symlink cannot be converted "
1033 "from %s to current locale.",
1034 archive_string_conversion_charset_name(
1039 zip_entry->uncompressed_size = zip_entry->compressed_size = 0;
1041 if (__archive_read_consume(a, linkname_length) < 0) {
1042 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1043 "Read error skipping symlink target name");
1044 return ARCHIVE_FATAL;
1046 } else if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
1047 || zip_entry->uncompressed_size > 0) {
1048 /* Set the size only if it's meaningful. */
1049 archive_entry_set_size(entry, zip_entry->uncompressed_size);
1051 zip->entry_bytes_remaining = zip_entry->compressed_size;
1053 /* If there's no body, force read_data() to return EOF immediately. */
1054 if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
1055 && zip->entry_bytes_remaining < 1)
1056 zip->end_of_entry = 1;
1058 /* Set up a more descriptive format name. */
1059 archive_string_sprintf(&zip->format_name, "ZIP %d.%d (%s)",
1060 version / 10, version % 10,
1061 compression_name(zip->entry->compression));
1062 a->archive.archive_format_name = zip->format_name.s;
1068 check_authentication_code(struct archive_read *a, const void *_p)
1070 struct zip *zip = (struct zip *)(a->format->data);
1072 /* Check authentication code. */
1073 if (zip->hctx_valid) {
1076 size_t hmac_len = 20;
1079 archive_hmac_sha1_final(&zip->hctx, hmac, &hmac_len);
1081 /* Read authentication code. */
1082 p = __archive_read_ahead(a, AUTH_CODE_SIZE, NULL);
1084 archive_set_error(&a->archive,
1085 ARCHIVE_ERRNO_FILE_FORMAT,
1086 "Truncated ZIP file data");
1087 return (ARCHIVE_FATAL);
1092 cmp = memcmp(hmac, p, AUTH_CODE_SIZE);
1093 __archive_read_consume(a, AUTH_CODE_SIZE);
1095 archive_set_error(&a->archive,
1097 "ZIP bad Authentication code");
1098 return (ARCHIVE_WARN);
1101 return (ARCHIVE_OK);
1105 * Read "uncompressed" data. There are three cases:
1106 * 1) We know the size of the data. This is always true for the
1107 * seeking reader (we've examined the Central Directory already).
1108 * 2) ZIP_LENGTH_AT_END was set, but only the CRC was deferred.
1109 * Info-ZIP seems to do this; we know the size but have to grab
1110 * the CRC from the data descriptor afterwards.
1111 * 3) We're streaming and ZIP_LENGTH_AT_END was specified and
1112 * we have no size information. In this case, we can do pretty
1113 * well by watching for the data descriptor record. The data
1114 * descriptor is 16 bytes and includes a computed CRC that should
1115 * provide a strong check.
1117 * TODO: Technically, the PK\007\010 signature is optional.
1118 * In the original spec, the data descriptor contained CRC
1119 * and size fields but had no leading signature. In practice,
1120 * newer writers seem to provide the signature pretty consistently.
1122 * For uncompressed data, the PK\007\010 marker seems essential
1123 * to be sure we've actually seen the end of the entry.
1125 * Returns ARCHIVE_OK if successful, ARCHIVE_FATAL otherwise, sets
1126 * zip->end_of_entry if it consumes all of the data.
1129 zip_read_data_none(struct archive_read *a, const void **_buff,
1130 size_t *size, int64_t *offset)
1134 ssize_t bytes_avail;
1137 (void)offset; /* UNUSED */
1139 zip = (struct zip *)(a->format->data);
1141 if (zip->entry->zip_flags & ZIP_LENGTH_AT_END) {
1143 ssize_t grabbing_bytes = 24;
1145 if (zip->hctx_valid)
1146 grabbing_bytes += AUTH_CODE_SIZE;
1147 /* Grab at least 24 bytes. */
1148 buff = __archive_read_ahead(a, grabbing_bytes, &bytes_avail);
1149 if (bytes_avail < grabbing_bytes) {
1150 /* Zip archives have end-of-archive markers
1151 that are longer than this, so a failure to get at
1152 least 24 bytes really does indicate a truncated
1154 archive_set_error(&a->archive,
1155 ARCHIVE_ERRNO_FILE_FORMAT,
1156 "Truncated ZIP file data");
1157 return (ARCHIVE_FATAL);
1159 /* Check for a complete PK\007\010 signature, followed
1160 * by the correct 4-byte CRC. */
1162 if (zip->hctx_valid)
1163 p += AUTH_CODE_SIZE;
1164 if (p[0] == 'P' && p[1] == 'K'
1165 && p[2] == '\007' && p[3] == '\010'
1166 && (archive_le32dec(p + 4) == zip->entry_crc32
1167 || zip->ignore_crc32
1169 && zip->entry->aes_extra.vendor == AES_VENDOR_AE_2))) {
1170 if (zip->entry->flags & LA_USED_ZIP64) {
1171 uint64_t compressed, uncompressed;
1172 zip->entry->crc32 = archive_le32dec(p + 4);
1173 compressed = archive_le64dec(p + 8);
1174 uncompressed = archive_le64dec(p + 16);
1175 if (compressed > INT64_MAX || uncompressed > INT64_MAX) {
1176 archive_set_error(&a->archive,
1177 ARCHIVE_ERRNO_FILE_FORMAT,
1178 "Overflow of 64-bit file sizes");
1179 return ARCHIVE_FAILED;
1181 zip->entry->compressed_size = compressed;
1182 zip->entry->uncompressed_size = uncompressed;
1183 zip->unconsumed = 24;
1185 zip->entry->crc32 = archive_le32dec(p + 4);
1186 zip->entry->compressed_size =
1187 archive_le32dec(p + 8);
1188 zip->entry->uncompressed_size =
1189 archive_le32dec(p + 12);
1190 zip->unconsumed = 16;
1192 if (zip->hctx_valid) {
1193 r = check_authentication_code(a, buff);
1194 if (r != ARCHIVE_OK)
1197 zip->end_of_entry = 1;
1198 return (ARCHIVE_OK);
1200 /* If not at EOF, ensure we consume at least one byte. */
1203 /* Scan forward until we see where a PK\007\010 signature
1205 /* Return bytes up until that point. On the next call,
1206 * the code above will verify the data descriptor. */
1207 while (p < buff + bytes_avail - 4) {
1208 if (p[3] == 'P') { p += 3; }
1209 else if (p[3] == 'K') { p += 2; }
1210 else if (p[3] == '\007') { p += 1; }
1211 else if (p[3] == '\010' && p[2] == '\007'
1212 && p[1] == 'K' && p[0] == 'P') {
1213 if (zip->hctx_valid)
1214 p -= AUTH_CODE_SIZE;
1218 bytes_avail = p - buff;
1220 if (zip->entry_bytes_remaining == 0) {
1221 zip->end_of_entry = 1;
1222 if (zip->hctx_valid) {
1223 r = check_authentication_code(a, NULL);
1224 if (r != ARCHIVE_OK)
1227 return (ARCHIVE_OK);
1229 /* Grab a bunch of bytes. */
1230 buff = __archive_read_ahead(a, 1, &bytes_avail);
1231 if (bytes_avail <= 0) {
1232 archive_set_error(&a->archive,
1233 ARCHIVE_ERRNO_FILE_FORMAT,
1234 "Truncated ZIP file data");
1235 return (ARCHIVE_FATAL);
1237 if (bytes_avail > zip->entry_bytes_remaining)
1238 bytes_avail = (ssize_t)zip->entry_bytes_remaining;
1240 if (zip->tctx_valid || zip->cctx_valid) {
1241 size_t dec_size = bytes_avail;
1243 if (dec_size > zip->decrypted_buffer_size)
1244 dec_size = zip->decrypted_buffer_size;
1245 if (zip->tctx_valid) {
1246 trad_enc_decrypt_update(&zip->tctx,
1247 (const uint8_t *)buff, dec_size,
1248 zip->decrypted_buffer, dec_size);
1250 size_t dsize = dec_size;
1251 archive_hmac_sha1_update(&zip->hctx,
1252 (const uint8_t *)buff, dec_size);
1253 archive_decrypto_aes_ctr_update(&zip->cctx,
1254 (const uint8_t *)buff, dec_size,
1255 zip->decrypted_buffer, &dsize);
1257 bytes_avail = dec_size;
1258 buff = (const char *)zip->decrypted_buffer;
1260 *size = bytes_avail;
1261 zip->entry_bytes_remaining -= bytes_avail;
1262 zip->entry_uncompressed_bytes_read += bytes_avail;
1263 zip->entry_compressed_bytes_read += bytes_avail;
1264 zip->unconsumed += bytes_avail;
1266 return (ARCHIVE_OK);
1271 zip_deflate_init(struct archive_read *a, struct zip *zip)
1275 /* If we haven't yet read any data, initialize the decompressor. */
1276 if (!zip->decompress_init) {
1277 if (zip->stream_valid)
1278 r = inflateReset(&zip->stream);
1280 r = inflateInit2(&zip->stream,
1281 -15 /* Don't check for zlib header */);
1283 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1284 "Can't initialize ZIP decompression.");
1285 return (ARCHIVE_FATAL);
1287 /* Stream structure has been set up. */
1288 zip->stream_valid = 1;
1289 /* We've initialized decompression for this stream. */
1290 zip->decompress_init = 1;
1292 return (ARCHIVE_OK);
1296 zip_read_data_deflate(struct archive_read *a, const void **buff,
1297 size_t *size, int64_t *offset)
1300 ssize_t bytes_avail;
1301 const void *compressed_buff, *sp;
1304 (void)offset; /* UNUSED */
1306 zip = (struct zip *)(a->format->data);
1308 /* If the buffer hasn't been allocated, allocate it now. */
1309 if (zip->uncompressed_buffer == NULL) {
1310 zip->uncompressed_buffer_size = 256 * 1024;
1311 zip->uncompressed_buffer
1312 = (unsigned char *)malloc(zip->uncompressed_buffer_size);
1313 if (zip->uncompressed_buffer == NULL) {
1314 archive_set_error(&a->archive, ENOMEM,
1315 "No memory for ZIP decompression");
1316 return (ARCHIVE_FATAL);
1320 r = zip_deflate_init(a, zip);
1321 if (r != ARCHIVE_OK)
1325 * Note: '1' here is a performance optimization.
1326 * Recall that the decompression layer returns a count of
1327 * available bytes; asking for more than that forces the
1328 * decompressor to combine reads by copying data.
1330 compressed_buff = sp = __archive_read_ahead(a, 1, &bytes_avail);
1331 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
1332 && bytes_avail > zip->entry_bytes_remaining) {
1333 bytes_avail = (ssize_t)zip->entry_bytes_remaining;
1335 if (bytes_avail < 0) {
1336 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1337 "Truncated ZIP file body");
1338 return (ARCHIVE_FATAL);
1341 if (zip->tctx_valid || zip->cctx_valid) {
1342 if (zip->decrypted_bytes_remaining < (size_t)bytes_avail) {
1343 size_t buff_remaining =
1344 (zip->decrypted_buffer + zip->decrypted_buffer_size)
1345 - (zip->decrypted_ptr + zip->decrypted_bytes_remaining);
1347 if (buff_remaining > (size_t)bytes_avail)
1348 buff_remaining = (size_t)bytes_avail;
1350 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) &&
1351 zip->entry_bytes_remaining > 0) {
1352 if ((int64_t)(zip->decrypted_bytes_remaining
1354 > zip->entry_bytes_remaining) {
1355 if (zip->entry_bytes_remaining <
1356 (int64_t)zip->decrypted_bytes_remaining)
1360 (size_t)zip->entry_bytes_remaining
1361 - zip->decrypted_bytes_remaining;
1364 if (buff_remaining > 0) {
1365 if (zip->tctx_valid) {
1366 trad_enc_decrypt_update(&zip->tctx,
1367 compressed_buff, buff_remaining,
1369 + zip->decrypted_bytes_remaining,
1372 size_t dsize = buff_remaining;
1373 archive_decrypto_aes_ctr_update(
1375 compressed_buff, buff_remaining,
1377 + zip->decrypted_bytes_remaining,
1380 zip->decrypted_bytes_remaining += buff_remaining;
1383 bytes_avail = zip->decrypted_bytes_remaining;
1384 compressed_buff = (const char *)zip->decrypted_ptr;
1388 * A bug in zlib.h: stream.next_in should be marked 'const'
1389 * but isn't (the library never alters data through the
1390 * next_in pointer, only reads it). The result: this ugly
1391 * cast to remove 'const'.
1393 zip->stream.next_in = (Bytef *)(uintptr_t)(const void *)compressed_buff;
1394 zip->stream.avail_in = (uInt)bytes_avail;
1395 zip->stream.total_in = 0;
1396 zip->stream.next_out = zip->uncompressed_buffer;
1397 zip->stream.avail_out = (uInt)zip->uncompressed_buffer_size;
1398 zip->stream.total_out = 0;
1400 r = inflate(&zip->stream, 0);
1405 zip->end_of_entry = 1;
1408 archive_set_error(&a->archive, ENOMEM,
1409 "Out of memory for ZIP decompression");
1410 return (ARCHIVE_FATAL);
1412 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1413 "ZIP decompression failed (%d)", r);
1414 return (ARCHIVE_FATAL);
1417 /* Consume as much as the compressor actually used. */
1418 bytes_avail = zip->stream.total_in;
1419 if (zip->tctx_valid || zip->cctx_valid) {
1420 zip->decrypted_bytes_remaining -= bytes_avail;
1421 if (zip->decrypted_bytes_remaining == 0)
1422 zip->decrypted_ptr = zip->decrypted_buffer;
1424 zip->decrypted_ptr += bytes_avail;
1426 /* Calculate compressed data as much as we used.*/
1427 if (zip->hctx_valid)
1428 archive_hmac_sha1_update(&zip->hctx, sp, bytes_avail);
1429 __archive_read_consume(a, bytes_avail);
1430 zip->entry_bytes_remaining -= bytes_avail;
1431 zip->entry_compressed_bytes_read += bytes_avail;
1433 *size = zip->stream.total_out;
1434 zip->entry_uncompressed_bytes_read += zip->stream.total_out;
1435 *buff = zip->uncompressed_buffer;
1437 if (zip->end_of_entry && zip->hctx_valid) {
1438 r = check_authentication_code(a, NULL);
1439 if (r != ARCHIVE_OK)
1443 if (zip->end_of_entry && (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
1446 if (NULL == (p = __archive_read_ahead(a, 24, NULL))) {
1447 archive_set_error(&a->archive,
1448 ARCHIVE_ERRNO_FILE_FORMAT,
1449 "Truncated ZIP end-of-file record");
1450 return (ARCHIVE_FATAL);
1452 /* Consume the optional PK\007\010 marker. */
1453 if (p[0] == 'P' && p[1] == 'K' &&
1454 p[2] == '\007' && p[3] == '\010') {
1456 zip->unconsumed = 4;
1458 if (zip->entry->flags & LA_USED_ZIP64) {
1459 uint64_t compressed, uncompressed;
1460 zip->entry->crc32 = archive_le32dec(p);
1461 compressed = archive_le64dec(p + 4);
1462 uncompressed = archive_le64dec(p + 12);
1463 if (compressed > INT64_MAX || uncompressed > INT64_MAX) {
1464 archive_set_error(&a->archive,
1465 ARCHIVE_ERRNO_FILE_FORMAT,
1466 "Overflow of 64-bit file sizes");
1467 return ARCHIVE_FAILED;
1469 zip->entry->compressed_size = compressed;
1470 zip->entry->uncompressed_size = uncompressed;
1471 zip->unconsumed += 20;
1473 zip->entry->crc32 = archive_le32dec(p);
1474 zip->entry->compressed_size = archive_le32dec(p + 4);
1475 zip->entry->uncompressed_size = archive_le32dec(p + 8);
1476 zip->unconsumed += 12;
1480 return (ARCHIVE_OK);
1485 read_decryption_header(struct archive_read *a)
1487 struct zip *zip = (struct zip *)(a->format->data);
1489 unsigned int remaining_size;
1493 * Read an initialization vector data field.
1495 p = __archive_read_ahead(a, 2, NULL);
1499 zip->iv_size = archive_le16dec(p);
1500 __archive_read_consume(a, 2);
1501 if (ts < zip->iv_size) {
1505 p = __archive_read_ahead(a, zip->iv_size, NULL);
1508 if (zip->iv == NULL) {
1509 zip->iv = malloc(zip->iv_size);
1510 if (zip->iv == NULL)
1513 memcpy(zip->iv, p, zip->iv_size);
1514 __archive_read_consume(a, zip->iv_size);
1517 * Read a size of remaining decryption header field.
1519 p = __archive_read_ahead(a, 14, NULL);
1522 remaining_size = archive_le32dec(p);
1523 if (remaining_size < 16 || remaining_size > (1 << 18))
1526 /* Check if format version is supported. */
1527 if (archive_le16dec(p+4) != 3) {
1528 archive_set_error(&a->archive,
1529 ARCHIVE_ERRNO_FILE_FORMAT,
1530 "Unsupported encryption format version: %u",
1531 archive_le16dec(p+4));
1532 return (ARCHIVE_FAILED);
1536 * Read an encryption algorithm field.
1538 zip->alg_id = archive_le16dec(p+6);
1539 switch (zip->alg_id) {
1540 case 0x6601:/* DES */
1541 case 0x6602:/* RC2 */
1542 case 0x6603:/* 3DES 168 */
1543 case 0x6609:/* 3DES 112 */
1544 case 0x660E:/* AES 128 */
1545 case 0x660F:/* AES 192 */
1546 case 0x6610:/* AES 256 */
1547 case 0x6702:/* RC2 (version >= 5.2) */
1548 case 0x6720:/* Blowfish */
1549 case 0x6721:/* Twofish */
1550 case 0x6801:/* RC4 */
1551 /* Supported encryption algorithm. */
1554 archive_set_error(&a->archive,
1555 ARCHIVE_ERRNO_FILE_FORMAT,
1556 "Unknown encryption algorithm: %u", zip->alg_id);
1557 return (ARCHIVE_FAILED);
1561 * Read a bit length field.
1563 zip->bit_len = archive_le16dec(p+8);
1566 * Read a flags field.
1568 zip->flags = archive_le16dec(p+10);
1569 switch (zip->flags & 0xf000) {
1570 case 0x0001: /* Password is required to decrypt. */
1571 case 0x0002: /* Certificates only. */
1572 case 0x0003: /* Password or certificate required to decrypt. */
1575 archive_set_error(&a->archive,
1576 ARCHIVE_ERRNO_FILE_FORMAT,
1577 "Unknown encryption flag: %u", zip->flags);
1578 return (ARCHIVE_FAILED);
1580 if ((zip->flags & 0xf000) == 0 ||
1581 (zip->flags & 0xf000) == 0x4000) {
1582 archive_set_error(&a->archive,
1583 ARCHIVE_ERRNO_FILE_FORMAT,
1584 "Unknown encryption flag: %u", zip->flags);
1585 return (ARCHIVE_FAILED);
1589 * Read an encrypted random data field.
1592 zip->erd_size = archive_le16dec(p+12);
1593 __archive_read_consume(a, 14);
1594 if ((zip->erd_size & 0xf) != 0 ||
1595 (zip->erd_size + 16) > remaining_size ||
1596 (zip->erd_size + 16) < zip->erd_size)
1599 if (ts < zip->erd_size) {
1603 p = __archive_read_ahead(a, zip->erd_size, NULL);
1606 if (zip->erd == NULL) {
1607 zip->erd = malloc(zip->erd_size);
1608 if (zip->erd == NULL)
1611 memcpy(zip->erd, p, zip->erd_size);
1612 __archive_read_consume(a, zip->erd_size);
1615 * Read a reserved data field.
1617 p = __archive_read_ahead(a, 4, NULL);
1620 /* Reserved data size should be zero. */
1621 if (archive_le32dec(p) != 0)
1623 __archive_read_consume(a, 4);
1626 * Read a password validation data field.
1628 p = __archive_read_ahead(a, 2, NULL);
1632 zip->v_size = archive_le16dec(p);
1633 __archive_read_consume(a, 2);
1634 if ((zip->v_size & 0x0f) != 0 ||
1635 (zip->erd_size + zip->v_size + 16) > remaining_size ||
1636 (zip->erd_size + zip->v_size + 16) < (zip->erd_size + zip->v_size))
1638 if (ts < zip->v_size) {
1642 p = __archive_read_ahead(a, zip->v_size, NULL);
1645 if (zip->v_data == NULL) {
1646 zip->v_data = malloc(zip->v_size);
1647 if (zip->v_data == NULL)
1650 memcpy(zip->v_data, p, zip->v_size);
1651 __archive_read_consume(a, zip->v_size);
1653 p = __archive_read_ahead(a, 4, NULL);
1656 zip->v_crc32 = archive_le32dec(p);
1657 __archive_read_consume(a, 4);
1659 /*return (ARCHIVE_OK);
1660 * This is not fully implemented yet.*/
1661 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1662 "Encrypted file is unsupported");
1663 return (ARCHIVE_FAILED);
1665 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1666 "Truncated ZIP file data");
1667 return (ARCHIVE_FATAL);
1669 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1670 "Corrupted ZIP file data");
1671 return (ARCHIVE_FATAL);
1673 archive_set_error(&a->archive, ENOMEM,
1674 "No memory for ZIP decryption");
1675 return (ARCHIVE_FATAL);
1679 zip_alloc_decryption_buffer(struct archive_read *a)
1681 struct zip *zip = (struct zip *)(a->format->data);
1682 size_t bs = 256 * 1024;
1684 if (zip->decrypted_buffer == NULL) {
1685 zip->decrypted_buffer_size = bs;
1686 zip->decrypted_buffer = malloc(bs);
1687 if (zip->decrypted_buffer == NULL) {
1688 archive_set_error(&a->archive, ENOMEM,
1689 "No memory for ZIP decryption");
1690 return (ARCHIVE_FATAL);
1693 zip->decrypted_ptr = zip->decrypted_buffer;
1694 return (ARCHIVE_OK);
1698 init_traditional_PKWARE_decryption(struct archive_read *a)
1700 struct zip *zip = (struct zip *)(a->format->data);
1705 if (zip->tctx_valid)
1706 return (ARCHIVE_OK);
1709 Read the 12 bytes encryption header stored at
1710 the start of the data area.
1712 #define ENC_HEADER_SIZE 12
1713 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
1714 && zip->entry_bytes_remaining < ENC_HEADER_SIZE) {
1715 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1716 "Truncated Zip encrypted body: only %jd bytes available",
1717 (intmax_t)zip->entry_bytes_remaining);
1718 return (ARCHIVE_FATAL);
1721 p = __archive_read_ahead(a, ENC_HEADER_SIZE, NULL);
1723 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1724 "Truncated ZIP file data");
1725 return (ARCHIVE_FATAL);
1728 for (retry = 0;; retry++) {
1729 const char *passphrase;
1732 passphrase = __archive_read_next_passphrase(a);
1733 if (passphrase == NULL) {
1734 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1736 "Incorrect passphrase":
1737 "Passphrase required for this entry");
1738 return (ARCHIVE_FAILED);
1742 * Initialize ctx for Traditional PKWARE Decryption.
1744 r = trad_enc_init(&zip->tctx, passphrase, strlen(passphrase),
1745 p, ENC_HEADER_SIZE, &crcchk);
1746 if (r == 0 && crcchk == zip->entry->decdat)
1747 break;/* The passphrase is OK. */
1748 if (retry > 10000) {
1749 /* Avoid infinity loop. */
1750 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1751 "Too many incorrect passphrases");
1752 return (ARCHIVE_FAILED);
1756 __archive_read_consume(a, ENC_HEADER_SIZE);
1757 zip->tctx_valid = 1;
1758 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
1759 zip->entry_bytes_remaining -= ENC_HEADER_SIZE;
1761 /*zip->entry_uncompressed_bytes_read += ENC_HEADER_SIZE;*/
1762 zip->entry_compressed_bytes_read += ENC_HEADER_SIZE;
1763 zip->decrypted_bytes_remaining = 0;
1765 return (zip_alloc_decryption_buffer(a));
1766 #undef ENC_HEADER_SIZE
1770 init_WinZip_AES_decryption(struct archive_read *a)
1772 struct zip *zip = (struct zip *)(a->format->data);
1775 size_t key_len, salt_len;
1776 uint8_t derived_key[MAX_DERIVED_KEY_BUF_SIZE];
1780 if (zip->cctx_valid || zip->hctx_valid)
1781 return (ARCHIVE_OK);
1783 switch (zip->entry->aes_extra.strength) {
1784 case 1: salt_len = 8; key_len = 16; break;
1785 case 2: salt_len = 12; key_len = 24; break;
1786 case 3: salt_len = 16; key_len = 32; break;
1787 default: goto corrupted;
1789 p = __archive_read_ahead(a, salt_len + 2, NULL);
1793 for (retry = 0;; retry++) {
1794 const char *passphrase;
1796 passphrase = __archive_read_next_passphrase(a);
1797 if (passphrase == NULL) {
1798 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1800 "Incorrect passphrase":
1801 "Passphrase required for this entry");
1802 return (ARCHIVE_FAILED);
1804 memset(derived_key, 0, sizeof(derived_key));
1805 r = archive_pbkdf2_sha1(passphrase, strlen(passphrase),
1806 p, salt_len, 1000, derived_key, key_len * 2 + 2);
1808 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1809 "Decryption is unsupported due to lack of "
1811 return (ARCHIVE_FAILED);
1814 /* Check password verification value. */
1815 pv = ((const uint8_t *)p) + salt_len;
1816 if (derived_key[key_len * 2] == pv[0] &&
1817 derived_key[key_len * 2 + 1] == pv[1])
1818 break;/* The passphrase is OK. */
1819 if (retry > 10000) {
1820 /* Avoid infinity loop. */
1821 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1822 "Too many incorrect passphrases");
1823 return (ARCHIVE_FAILED);
1827 r = archive_decrypto_aes_ctr_init(&zip->cctx, derived_key, key_len);
1829 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1830 "Decryption is unsupported due to lack of crypto library");
1831 return (ARCHIVE_FAILED);
1833 r = archive_hmac_sha1_init(&zip->hctx, derived_key + key_len, key_len);
1835 archive_decrypto_aes_ctr_release(&zip->cctx);
1836 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1837 "Failed to initialize HMAC-SHA1");
1838 return (ARCHIVE_FAILED);
1840 zip->cctx_valid = zip->hctx_valid = 1;
1841 __archive_read_consume(a, salt_len + 2);
1842 zip->entry_bytes_remaining -= salt_len + 2 + AUTH_CODE_SIZE;
1843 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
1844 && zip->entry_bytes_remaining < 0)
1846 zip->entry_compressed_bytes_read += salt_len + 2 + AUTH_CODE_SIZE;
1847 zip->decrypted_bytes_remaining = 0;
1849 zip->entry->compression = zip->entry->aes_extra.compression;
1850 return (zip_alloc_decryption_buffer(a));
1853 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1854 "Truncated ZIP file data");
1855 return (ARCHIVE_FATAL);
1857 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1858 "Corrupted ZIP file data");
1859 return (ARCHIVE_FATAL);
1863 archive_read_format_zip_read_data(struct archive_read *a,
1864 const void **buff, size_t *size, int64_t *offset)
1867 struct zip *zip = (struct zip *)(a->format->data);
1869 if (zip->has_encrypted_entries ==
1870 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
1871 zip->has_encrypted_entries = 0;
1874 *offset = zip->entry_uncompressed_bytes_read;
1878 /* If we hit end-of-entry last time, return ARCHIVE_EOF. */
1879 if (zip->end_of_entry)
1880 return (ARCHIVE_EOF);
1882 /* Return EOF immediately if this is a non-regular file. */
1883 if (AE_IFREG != (zip->entry->mode & AE_IFMT))
1884 return (ARCHIVE_EOF);
1886 __archive_read_consume(a, zip->unconsumed);
1887 zip->unconsumed = 0;
1889 if (zip->init_decryption) {
1890 zip->has_encrypted_entries = 1;
1891 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
1892 r = read_decryption_header(a);
1893 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
1894 r = init_WinZip_AES_decryption(a);
1896 r = init_traditional_PKWARE_decryption(a);
1897 if (r != ARCHIVE_OK)
1899 zip->init_decryption = 0;
1902 switch(zip->entry->compression) {
1903 case 0: /* No compression. */
1904 r = zip_read_data_none(a, buff, size, offset);
1907 case 8: /* Deflate compression. */
1908 r = zip_read_data_deflate(a, buff, size, offset);
1911 default: /* Unsupported compression. */
1912 /* Return a warning. */
1913 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1914 "Unsupported ZIP compression method (%s)",
1915 compression_name(zip->entry->compression));
1916 /* We can't decompress this entry, but we will
1917 * be able to skip() it and try the next entry. */
1918 return (ARCHIVE_FAILED);
1921 if (r != ARCHIVE_OK)
1923 /* Update checksum */
1925 zip->entry_crc32 = zip->crc32func(zip->entry_crc32, *buff,
1927 /* If we hit the end, swallow any end-of-data marker. */
1928 if (zip->end_of_entry) {
1929 /* Check file size, CRC against these values. */
1930 if (zip->entry->compressed_size !=
1931 zip->entry_compressed_bytes_read) {
1932 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1933 "ZIP compressed data is wrong size "
1934 "(read %jd, expected %jd)",
1935 (intmax_t)zip->entry_compressed_bytes_read,
1936 (intmax_t)zip->entry->compressed_size);
1937 return (ARCHIVE_WARN);
1939 /* Size field only stores the lower 32 bits of the actual
1941 if ((zip->entry->uncompressed_size & UINT32_MAX)
1942 != (zip->entry_uncompressed_bytes_read & UINT32_MAX)) {
1943 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1944 "ZIP uncompressed data is wrong size "
1945 "(read %jd, expected %jd)\n",
1946 (intmax_t)zip->entry_uncompressed_bytes_read,
1947 (intmax_t)zip->entry->uncompressed_size);
1948 return (ARCHIVE_WARN);
1950 /* Check computed CRC against header */
1951 if ((!zip->hctx_valid ||
1952 zip->entry->aes_extra.vendor != AES_VENDOR_AE_2) &&
1953 zip->entry->crc32 != zip->entry_crc32
1954 && !zip->ignore_crc32) {
1955 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1956 "ZIP bad CRC: 0x%lx should be 0x%lx",
1957 (unsigned long)zip->entry_crc32,
1958 (unsigned long)zip->entry->crc32);
1959 return (ARCHIVE_WARN);
1963 return (ARCHIVE_OK);
1967 archive_read_format_zip_cleanup(struct archive_read *a)
1970 struct zip_entry *zip_entry, *next_zip_entry;
1972 zip = (struct zip *)(a->format->data);
1974 if (zip->stream_valid)
1975 inflateEnd(&zip->stream);
1976 free(zip->uncompressed_buffer);
1978 if (zip->zip_entries) {
1979 zip_entry = zip->zip_entries;
1980 while (zip_entry != NULL) {
1981 next_zip_entry = zip_entry->next;
1982 archive_string_free(&zip_entry->rsrcname);
1984 zip_entry = next_zip_entry;
1987 free(zip->decrypted_buffer);
1988 if (zip->cctx_valid)
1989 archive_decrypto_aes_ctr_release(&zip->cctx);
1990 if (zip->hctx_valid)
1991 archive_hmac_sha1_cleanup(&zip->hctx);
1995 archive_string_free(&zip->format_name);
1997 (a->format->data) = NULL;
1998 return (ARCHIVE_OK);
2002 archive_read_format_zip_has_encrypted_entries(struct archive_read *_a)
2004 if (_a && _a->format) {
2005 struct zip * zip = (struct zip *)_a->format->data;
2007 return zip->has_encrypted_entries;
2010 return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
2014 archive_read_format_zip_options(struct archive_read *a,
2015 const char *key, const char *val)
2018 int ret = ARCHIVE_FAILED;
2020 zip = (struct zip *)(a->format->data);
2021 if (strcmp(key, "compat-2x") == 0) {
2022 /* Handle filenames as libarchive 2.x */
2023 zip->init_default_conversion = (val != NULL) ? 1 : 0;
2024 return (ARCHIVE_OK);
2025 } else if (strcmp(key, "hdrcharset") == 0) {
2026 if (val == NULL || val[0] == 0)
2027 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2028 "zip: hdrcharset option needs a character-set name"
2031 zip->sconv = archive_string_conversion_from_charset(
2032 &a->archive, val, 0);
2033 if (zip->sconv != NULL) {
2034 if (strcmp(val, "UTF-8") == 0)
2035 zip->sconv_utf8 = zip->sconv;
2038 ret = ARCHIVE_FATAL;
2041 } else if (strcmp(key, "ignorecrc32") == 0) {
2042 /* Mostly useful for testing. */
2043 if (val == NULL || val[0] == 0) {
2044 zip->crc32func = real_crc32;
2045 zip->ignore_crc32 = 0;
2047 zip->crc32func = fake_crc32;
2048 zip->ignore_crc32 = 1;
2050 return (ARCHIVE_OK);
2051 } else if (strcmp(key, "mac-ext") == 0) {
2052 zip->process_mac_extensions = (val != NULL && val[0] != 0);
2053 return (ARCHIVE_OK);
2056 /* Note: The "warn" return is just to inform the options
2057 * supervisor that we didn't handle it. It will generate
2058 * a suitable error if no one used this option. */
2059 return (ARCHIVE_WARN);
2063 archive_read_support_format_zip(struct archive *a)
2066 r = archive_read_support_format_zip_streamable(a);
2067 if (r != ARCHIVE_OK)
2069 return (archive_read_support_format_zip_seekable(a));
2072 /* ------------------------------------------------------------------------ */
2075 * Streaming-mode support
2080 archive_read_support_format_zip_capabilities_streamable(struct archive_read * a)
2082 (void)a; /* UNUSED */
2083 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
2084 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
2088 archive_read_format_zip_streamable_bid(struct archive_read *a, int best_bid)
2092 (void)best_bid; /* UNUSED */
2094 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
2098 * Bid of 29 here comes from:
2099 * + 16 bits for "PK",
2100 * + next 16-bit field has 6 options so contributes
2101 * about 16 - log_2(6) ~= 16 - 2.6 ~= 13 bits
2103 * So we've effectively verified ~29 total bits of check data.
2105 if (p[0] == 'P' && p[1] == 'K') {
2106 if ((p[2] == '\001' && p[3] == '\002')
2107 || (p[2] == '\003' && p[3] == '\004')
2108 || (p[2] == '\005' && p[3] == '\006')
2109 || (p[2] == '\006' && p[3] == '\006')
2110 || (p[2] == '\007' && p[3] == '\010')
2111 || (p[2] == '0' && p[3] == '0'))
2115 /* TODO: It's worth looking ahead a little bit for a valid
2116 * PK signature. In particular, that would make it possible
2117 * to read some UUEncoded SFX files or SFX files coming from
2118 * a network socket. */
2124 archive_read_format_zip_streamable_read_header(struct archive_read *a,
2125 struct archive_entry *entry)
2129 a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
2130 if (a->archive.archive_format_name == NULL)
2131 a->archive.archive_format_name = "ZIP";
2133 zip = (struct zip *)(a->format->data);
2136 * It should be sufficient to call archive_read_next_header() for
2137 * a reader to determine if an entry is encrypted or not. If the
2138 * encryption of an entry is only detectable when calling
2139 * archive_read_data(), so be it. We'll do the same check there
2142 if (zip->has_encrypted_entries ==
2143 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
2144 zip->has_encrypted_entries = 0;
2146 /* Make sure we have a zip_entry structure to use. */
2147 if (zip->zip_entries == NULL) {
2148 zip->zip_entries = malloc(sizeof(struct zip_entry));
2149 if (zip->zip_entries == NULL) {
2150 archive_set_error(&a->archive, ENOMEM,
2152 return ARCHIVE_FATAL;
2155 zip->entry = zip->zip_entries;
2156 memset(zip->entry, 0, sizeof(struct zip_entry));
2158 if (zip->cctx_valid)
2159 archive_decrypto_aes_ctr_release(&zip->cctx);
2160 if (zip->hctx_valid)
2161 archive_hmac_sha1_cleanup(&zip->hctx);
2162 zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
2163 __archive_read_reset_passphrase(a);
2165 /* Search ahead for the next local file header. */
2166 __archive_read_consume(a, zip->unconsumed);
2167 zip->unconsumed = 0;
2169 int64_t skipped = 0;
2170 const char *p, *end;
2173 p = __archive_read_ahead(a, 4, &bytes);
2175 return (ARCHIVE_FATAL);
2178 while (p + 4 <= end) {
2179 if (p[0] == 'P' && p[1] == 'K') {
2180 if (p[2] == '\003' && p[3] == '\004') {
2181 /* Regular file entry. */
2182 __archive_read_consume(a, skipped);
2183 return zip_read_local_file_header(a,
2188 * TODO: We cannot restore permissions
2189 * based only on the local file headers.
2190 * Consider scanning the central
2191 * directory and returning additional
2192 * entries for at least directories.
2193 * This would allow us to properly set
2194 * directory permissions.
2196 * This won't help us fix symlinks
2197 * and may not help with regular file
2198 * permissions, either. <sigh>
2200 if (p[2] == '\001' && p[3] == '\002') {
2201 return (ARCHIVE_EOF);
2204 /* End of central directory? Must be an
2206 if ((p[2] == '\005' && p[3] == '\006')
2207 || (p[2] == '\006' && p[3] == '\006'))
2208 return (ARCHIVE_EOF);
2213 __archive_read_consume(a, skipped);
2218 archive_read_format_zip_read_data_skip_streamable(struct archive_read *a)
2221 int64_t bytes_skipped;
2223 zip = (struct zip *)(a->format->data);
2224 bytes_skipped = __archive_read_consume(a, zip->unconsumed);
2225 zip->unconsumed = 0;
2226 if (bytes_skipped < 0)
2227 return (ARCHIVE_FATAL);
2229 /* If we've already read to end of data, we're done. */
2230 if (zip->end_of_entry)
2231 return (ARCHIVE_OK);
2233 /* So we know we're streaming... */
2234 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
2235 || zip->entry->compressed_size > 0) {
2236 /* We know the compressed length, so we can just skip. */
2237 bytes_skipped = __archive_read_consume(a,
2238 zip->entry_bytes_remaining);
2239 if (bytes_skipped < 0)
2240 return (ARCHIVE_FATAL);
2241 return (ARCHIVE_OK);
2244 if (zip->init_decryption) {
2247 zip->has_encrypted_entries = 1;
2248 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
2249 r = read_decryption_header(a);
2250 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
2251 r = init_WinZip_AES_decryption(a);
2253 r = init_traditional_PKWARE_decryption(a);
2254 if (r != ARCHIVE_OK)
2256 zip->init_decryption = 0;
2259 /* We're streaming and we don't know the length. */
2260 /* If the body is compressed and we know the format, we can
2261 * find an exact end-of-entry by decompressing it. */
2262 switch (zip->entry->compression) {
2264 case 8: /* Deflate compression. */
2265 while (!zip->end_of_entry) {
2267 const void *buff = NULL;
2270 r = zip_read_data_deflate(a, &buff, &size, &offset);
2271 if (r != ARCHIVE_OK)
2276 default: /* Uncompressed or unknown. */
2277 /* Scan for a PK\007\010 signature. */
2279 const char *p, *buff;
2280 ssize_t bytes_avail;
2281 buff = __archive_read_ahead(a, 16, &bytes_avail);
2282 if (bytes_avail < 16) {
2283 archive_set_error(&a->archive,
2284 ARCHIVE_ERRNO_FILE_FORMAT,
2285 "Truncated ZIP file data");
2286 return (ARCHIVE_FATAL);
2289 while (p <= buff + bytes_avail - 16) {
2290 if (p[3] == 'P') { p += 3; }
2291 else if (p[3] == 'K') { p += 2; }
2292 else if (p[3] == '\007') { p += 1; }
2293 else if (p[3] == '\010' && p[2] == '\007'
2294 && p[1] == 'K' && p[0] == 'P') {
2295 if (zip->entry->flags & LA_USED_ZIP64)
2296 __archive_read_consume(a,
2299 __archive_read_consume(a,
2304 __archive_read_consume(a, p - buff);
2310 archive_read_support_format_zip_streamable(struct archive *_a)
2312 struct archive_read *a = (struct archive_read *)_a;
2316 archive_check_magic(_a, ARCHIVE_READ_MAGIC,
2317 ARCHIVE_STATE_NEW, "archive_read_support_format_zip");
2319 zip = (struct zip *)calloc(1, sizeof(*zip));
2321 archive_set_error(&a->archive, ENOMEM,
2322 "Can't allocate zip data");
2323 return (ARCHIVE_FATAL);
2326 /* Streamable reader doesn't support mac extensions. */
2327 zip->process_mac_extensions = 0;
2330 * Until enough data has been read, we cannot tell about
2331 * any encrypted entries yet.
2333 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
2334 zip->crc32func = real_crc32;
2336 r = __archive_read_register_format(a,
2339 archive_read_format_zip_streamable_bid,
2340 archive_read_format_zip_options,
2341 archive_read_format_zip_streamable_read_header,
2342 archive_read_format_zip_read_data,
2343 archive_read_format_zip_read_data_skip_streamable,
2345 archive_read_format_zip_cleanup,
2346 archive_read_support_format_zip_capabilities_streamable,
2347 archive_read_format_zip_has_encrypted_entries);
2349 if (r != ARCHIVE_OK)
2351 return (ARCHIVE_OK);
2354 /* ------------------------------------------------------------------------ */
2357 * Seeking-mode support
2361 archive_read_support_format_zip_capabilities_seekable(struct archive_read * a)
2363 (void)a; /* UNUSED */
2364 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
2365 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
2369 * TODO: This is a performance sink because it forces the read core to
2370 * drop buffered data from the start of file, which will then have to
2371 * be re-read again if this bidder loses.
2373 * We workaround this a little by passing in the best bid so far so
2374 * that later bidders can do nothing if they know they'll never
2375 * outbid. But we can certainly do better...
2378 read_eocd(struct zip *zip, const char *p, int64_t current_offset)
2380 /* Sanity-check the EOCD we've found. */
2382 /* This must be the first volume. */
2383 if (archive_le16dec(p + 4) != 0)
2385 /* Central directory must be on this volume. */
2386 if (archive_le16dec(p + 4) != archive_le16dec(p + 6))
2388 /* All central directory entries must be on this volume. */
2389 if (archive_le16dec(p + 10) != archive_le16dec(p + 8))
2391 /* Central directory can't extend beyond start of EOCD record. */
2392 if (archive_le32dec(p + 16) + archive_le32dec(p + 12)
2396 /* Save the central directory location for later use. */
2397 zip->central_directory_offset = archive_le32dec(p + 16);
2399 /* This is just a tiny bit higher than the maximum
2400 returned by the streaming Zip bidder. This ensures
2401 that the more accurate seeking Zip parser wins
2402 whenever seek is available. */
2407 * Examine Zip64 EOCD locator: If it's valid, store the information
2411 read_zip64_eocd(struct archive_read *a, struct zip *zip, const char *p)
2413 int64_t eocd64_offset;
2414 int64_t eocd64_size;
2416 /* Sanity-check the locator record. */
2418 /* Central dir must be on first volume. */
2419 if (archive_le32dec(p + 4) != 0)
2421 /* Must be only a single volume. */
2422 if (archive_le32dec(p + 16) != 1)
2425 /* Find the Zip64 EOCD record. */
2426 eocd64_offset = archive_le64dec(p + 8);
2427 if (__archive_read_seek(a, eocd64_offset, SEEK_SET) < 0)
2429 if ((p = __archive_read_ahead(a, 56, NULL)) == NULL)
2431 /* Make sure we can read all of it. */
2432 eocd64_size = archive_le64dec(p + 4) + 12;
2433 if (eocd64_size < 56 || eocd64_size > 16384)
2435 if ((p = __archive_read_ahead(a, (size_t)eocd64_size, NULL)) == NULL)
2438 /* Sanity-check the EOCD64 */
2439 if (archive_le32dec(p + 16) != 0) /* Must be disk #0 */
2441 if (archive_le32dec(p + 20) != 0) /* CD must be on disk #0 */
2443 /* CD can't be split. */
2444 if (archive_le64dec(p + 24) != archive_le64dec(p + 32))
2447 /* Save the central directory offset for later use. */
2448 zip->central_directory_offset = archive_le64dec(p + 48);
2454 archive_read_format_zip_seekable_bid(struct archive_read *a, int best_bid)
2456 struct zip *zip = (struct zip *)a->format->data;
2457 int64_t file_size, current_offset;
2461 /* If someone has already bid more than 32, then avoid
2462 trashing the look-ahead buffers with a seek. */
2466 file_size = __archive_read_seek(a, 0, SEEK_END);
2470 /* Search last 16k of file for end-of-central-directory
2471 * record (which starts with PK\005\006) */
2472 tail = (int)zipmin(1024 * 16, file_size);
2473 current_offset = __archive_read_seek(a, -tail, SEEK_END);
2474 if (current_offset < 0)
2476 if ((p = __archive_read_ahead(a, (size_t)tail, NULL)) == NULL)
2478 /* Boyer-Moore search backwards from the end, since we want
2479 * to match the last EOCD in the file (there can be more than
2480 * one if there is an uncompressed Zip archive as a member
2481 * within this Zip archive). */
2482 for (i = tail - 22; i > 0;) {
2485 if (memcmp(p + i, "PK\005\006", 4) == 0) {
2486 int ret = read_eocd(zip, p + i,
2487 current_offset + i);
2488 /* Zip64 EOCD locator precedes
2489 * regular EOCD if present. */
2490 if (i >= 20 && memcmp(p + i - 20, "PK\006\007", 4) == 0) {
2491 int ret_zip64 = read_zip64_eocd(a, zip, p + i - 20);
2492 if (ret_zip64 > ret)
2499 case 'K': i -= 1; break;
2500 case 005: i -= 2; break;
2501 case 006: i -= 3; break;
2502 default: i -= 4; break;
2508 /* The red-black trees are only used in seeking mode to manage
2509 * the in-memory copy of the central directory. */
2512 cmp_node(const struct archive_rb_node *n1, const struct archive_rb_node *n2)
2514 const struct zip_entry *e1 = (const struct zip_entry *)n1;
2515 const struct zip_entry *e2 = (const struct zip_entry *)n2;
2517 if (e1->local_header_offset > e2->local_header_offset)
2519 if (e1->local_header_offset < e2->local_header_offset)
2525 cmp_key(const struct archive_rb_node *n, const void *key)
2527 /* This function won't be called */
2528 (void)n; /* UNUSED */
2529 (void)key; /* UNUSED */
2533 static const struct archive_rb_tree_ops rb_ops = {
2538 rsrc_cmp_node(const struct archive_rb_node *n1,
2539 const struct archive_rb_node *n2)
2541 const struct zip_entry *e1 = (const struct zip_entry *)n1;
2542 const struct zip_entry *e2 = (const struct zip_entry *)n2;
2544 return (strcmp(e2->rsrcname.s, e1->rsrcname.s));
2548 rsrc_cmp_key(const struct archive_rb_node *n, const void *key)
2550 const struct zip_entry *e = (const struct zip_entry *)n;
2551 return (strcmp((const char *)key, e->rsrcname.s));
2554 static const struct archive_rb_tree_ops rb_rsrc_ops = {
2555 &rsrc_cmp_node, &rsrc_cmp_key
2559 rsrc_basename(const char *name, size_t name_length)
2565 s = memchr(s, '/', name_length - (s - name));
2574 expose_parent_dirs(struct zip *zip, const char *name, size_t name_length)
2576 struct archive_string str;
2577 struct zip_entry *dir;
2580 archive_string_init(&str);
2581 archive_strncpy(&str, name, name_length);
2583 s = strrchr(str.s, '/');
2587 /* Transfer the parent directory from zip->tree_rsrc RB
2588 * tree to zip->tree RB tree to expose. */
2589 dir = (struct zip_entry *)
2590 __archive_rb_tree_find_node(&zip->tree_rsrc, str.s);
2593 __archive_rb_tree_remove_node(&zip->tree_rsrc, &dir->node);
2594 archive_string_free(&dir->rsrcname);
2595 __archive_rb_tree_insert_node(&zip->tree, &dir->node);
2597 archive_string_free(&str);
2601 slurp_central_directory(struct archive_read *a, struct zip *zip)
2606 ssize_t bytes_avail;
2610 * Find the start of the central directory. The end-of-CD
2611 * record has our starting point, but there are lots of
2612 * Zip archives which have had other data prepended to the
2613 * file, which makes the recorded offsets all too small.
2614 * So we search forward from the specified offset until we
2615 * find the real start of the central directory. Then we
2616 * know the correction we need to apply to account for leading
2619 if (__archive_read_seek(a, zip->central_directory_offset, SEEK_SET) < 0)
2620 return ARCHIVE_FATAL;
2624 if ((p = __archive_read_ahead(a, 20, &bytes_avail)) == NULL)
2625 return ARCHIVE_FATAL;
2626 for (found = 0, i = 0; !found && i < bytes_avail - 4;) {
2628 case 'P': i += 3; break;
2629 case 'K': i += 2; break;
2630 case 001: i += 1; break;
2632 if (memcmp(p + i, "PK\001\002", 4) == 0) {
2638 case 005: i += 1; break;
2640 if (memcmp(p + i, "PK\005\006", 4) == 0) {
2643 } else if (memcmp(p + i, "PK\006\006", 4) == 0) {
2649 default: i += 4; break;
2652 __archive_read_consume(a, i);
2654 correction = archive_filter_bytes(&a->archive, 0)
2655 - zip->central_directory_offset;
2657 __archive_rb_tree_init(&zip->tree, &rb_ops);
2658 __archive_rb_tree_init(&zip->tree_rsrc, &rb_rsrc_ops);
2660 zip->central_directory_entries_total = 0;
2662 struct zip_entry *zip_entry;
2663 size_t filename_length, extra_length, comment_length;
2664 uint32_t external_attributes;
2665 const char *name, *r;
2667 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
2668 return ARCHIVE_FATAL;
2669 if (memcmp(p, "PK\006\006", 4) == 0
2670 || memcmp(p, "PK\005\006", 4) == 0) {
2672 } else if (memcmp(p, "PK\001\002", 4) != 0) {
2673 archive_set_error(&a->archive,
2674 -1, "Invalid central directory signature");
2675 return ARCHIVE_FATAL;
2677 if ((p = __archive_read_ahead(a, 46, NULL)) == NULL)
2678 return ARCHIVE_FATAL;
2680 zip_entry = calloc(1, sizeof(struct zip_entry));
2681 zip_entry->next = zip->zip_entries;
2682 zip_entry->flags |= LA_FROM_CENTRAL_DIRECTORY;
2683 zip->zip_entries = zip_entry;
2684 zip->central_directory_entries_total++;
2686 /* version = p[4]; */
2687 zip_entry->system = p[5];
2688 /* version_required = archive_le16dec(p + 6); */
2689 zip_entry->zip_flags = archive_le16dec(p + 8);
2690 if (zip_entry->zip_flags
2691 & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)){
2692 zip->has_encrypted_entries = 1;
2694 zip_entry->compression = (char)archive_le16dec(p + 10);
2695 zip_entry->mtime = zip_time(p + 12);
2696 zip_entry->crc32 = archive_le32dec(p + 16);
2697 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
2698 zip_entry->decdat = p[13];
2700 zip_entry->decdat = p[19];
2701 zip_entry->compressed_size = archive_le32dec(p + 20);
2702 zip_entry->uncompressed_size = archive_le32dec(p + 24);
2703 filename_length = archive_le16dec(p + 28);
2704 extra_length = archive_le16dec(p + 30);
2705 comment_length = archive_le16dec(p + 32);
2706 /* disk_start = archive_le16dec(p + 34); */ /* Better be zero. */
2707 /* internal_attributes = archive_le16dec(p + 36); */ /* text bit */
2708 external_attributes = archive_le32dec(p + 38);
2709 zip_entry->local_header_offset =
2710 archive_le32dec(p + 42) + correction;
2712 /* If we can't guess the mode, leave it zero here;
2713 when we read the local file header we might get
2714 more information. */
2715 if (zip_entry->system == 3) {
2716 zip_entry->mode = external_attributes >> 16;
2717 } else if (zip_entry->system == 0) {
2718 // Interpret MSDOS directory bit
2719 if (0x10 == (external_attributes & 0x10)) {
2720 zip_entry->mode = AE_IFDIR | 0775;
2722 zip_entry->mode = AE_IFREG | 0664;
2724 if (0x01 == (external_attributes & 0x01)) {
2725 // Read-only bit; strip write permissions
2726 zip_entry->mode &= 0555;
2729 zip_entry->mode = 0;
2732 /* We're done with the regular data; get the filename and
2734 __archive_read_consume(a, 46);
2735 p = __archive_read_ahead(a, filename_length + extra_length,
2738 archive_set_error(&a->archive,
2739 ARCHIVE_ERRNO_FILE_FORMAT,
2740 "Truncated ZIP file header");
2741 return ARCHIVE_FATAL;
2743 if (ARCHIVE_OK != process_extra(a, p + filename_length, extra_length, zip_entry)) {
2744 return ARCHIVE_FATAL;
2748 * Mac resource fork files are stored under the
2749 * "__MACOSX/" directory, so we should check if
2752 if (!zip->process_mac_extensions) {
2753 /* Treat every entry as a regular entry. */
2754 __archive_rb_tree_insert_node(&zip->tree,
2758 r = rsrc_basename(name, filename_length);
2759 if (filename_length >= 9 &&
2760 strncmp("__MACOSX/", name, 9) == 0) {
2761 /* If this file is not a resource fork nor
2762 * a directory. We should treat it as a non
2763 * resource fork file to expose it. */
2764 if (name[filename_length-1] != '/' &&
2765 (r - name < 3 || r[0] != '.' || r[1] != '_')) {
2766 __archive_rb_tree_insert_node(
2767 &zip->tree, &zip_entry->node);
2768 /* Expose its parent directories. */
2769 expose_parent_dirs(zip, name,
2772 /* This file is a resource fork file or
2774 archive_strncpy(&(zip_entry->rsrcname),
2775 name, filename_length);
2776 __archive_rb_tree_insert_node(
2777 &zip->tree_rsrc, &zip_entry->node);
2780 /* Generate resource fork name to find its
2781 * resource file at zip->tree_rsrc. */
2782 archive_strcpy(&(zip_entry->rsrcname),
2784 archive_strncat(&(zip_entry->rsrcname),
2786 archive_strcat(&(zip_entry->rsrcname), "._");
2787 archive_strncat(&(zip_entry->rsrcname),
2789 filename_length - (r - name));
2790 /* Register an entry to RB tree to sort it by
2792 __archive_rb_tree_insert_node(&zip->tree,
2797 /* Skip the comment too ... */
2798 __archive_read_consume(a,
2799 filename_length + extra_length + comment_length);
2806 zip_get_local_file_header_size(struct archive_read *a, size_t extra)
2809 ssize_t filename_length, extra_length;
2811 if ((p = __archive_read_ahead(a, extra + 30, NULL)) == NULL) {
2812 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2813 "Truncated ZIP file header");
2814 return (ARCHIVE_WARN);
2818 if (memcmp(p, "PK\003\004", 4) != 0) {
2819 archive_set_error(&a->archive, -1, "Damaged Zip archive");
2820 return ARCHIVE_WARN;
2822 filename_length = archive_le16dec(p + 26);
2823 extra_length = archive_le16dec(p + 28);
2825 return (30 + filename_length + extra_length);
2829 zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry,
2830 struct zip_entry *rsrc)
2832 struct zip *zip = (struct zip *)a->format->data;
2833 unsigned char *metadata, *mp;
2834 int64_t offset = archive_filter_bytes(&a->archive, 0);
2835 size_t remaining_bytes, metadata_bytes;
2837 int ret = ARCHIVE_OK, eof;
2839 switch(rsrc->compression) {
2840 case 0: /* No compression. */
2841 if (rsrc->uncompressed_size != rsrc->compressed_size) {
2842 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2843 "Malformed OS X metadata entry: inconsistent size");
2844 return (ARCHIVE_FATAL);
2847 case 8: /* Deflate compression. */
2850 default: /* Unsupported compression. */
2851 /* Return a warning. */
2852 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2853 "Unsupported ZIP compression method (%s)",
2854 compression_name(rsrc->compression));
2855 /* We can't decompress this entry, but we will
2856 * be able to skip() it and try the next entry. */
2857 return (ARCHIVE_WARN);
2860 if (rsrc->uncompressed_size > (4 * 1024 * 1024)) {
2861 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2862 "Mac metadata is too large: %jd > 4M bytes",
2863 (intmax_t)rsrc->uncompressed_size);
2864 return (ARCHIVE_WARN);
2866 if (rsrc->compressed_size > (4 * 1024 * 1024)) {
2867 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2868 "Mac metadata is too large: %jd > 4M bytes",
2869 (intmax_t)rsrc->compressed_size);
2870 return (ARCHIVE_WARN);
2873 metadata = malloc((size_t)rsrc->uncompressed_size);
2874 if (metadata == NULL) {
2875 archive_set_error(&a->archive, ENOMEM,
2876 "Can't allocate memory for Mac metadata");
2877 return (ARCHIVE_FATAL);
2880 if (offset < rsrc->local_header_offset)
2881 __archive_read_consume(a, rsrc->local_header_offset - offset);
2882 else if (offset != rsrc->local_header_offset) {
2883 __archive_read_seek(a, rsrc->local_header_offset, SEEK_SET);
2886 hsize = zip_get_local_file_header_size(a, 0);
2887 __archive_read_consume(a, hsize);
2889 remaining_bytes = (size_t)rsrc->compressed_size;
2890 metadata_bytes = (size_t)rsrc->uncompressed_size;
2893 while (!eof && remaining_bytes) {
2894 const unsigned char *p;
2895 ssize_t bytes_avail;
2898 p = __archive_read_ahead(a, 1, &bytes_avail);
2900 archive_set_error(&a->archive,
2901 ARCHIVE_ERRNO_FILE_FORMAT,
2902 "Truncated ZIP file header");
2904 goto exit_mac_metadata;
2906 if ((size_t)bytes_avail > remaining_bytes)
2907 bytes_avail = remaining_bytes;
2908 switch(rsrc->compression) {
2909 case 0: /* No compression. */
2910 if ((size_t)bytes_avail > metadata_bytes)
2911 bytes_avail = metadata_bytes;
2912 memcpy(mp, p, bytes_avail);
2913 bytes_used = (size_t)bytes_avail;
2914 metadata_bytes -= bytes_used;
2916 if (metadata_bytes == 0)
2920 case 8: /* Deflate compression. */
2924 ret = zip_deflate_init(a, zip);
2925 if (ret != ARCHIVE_OK)
2926 goto exit_mac_metadata;
2927 zip->stream.next_in =
2928 (Bytef *)(uintptr_t)(const void *)p;
2929 zip->stream.avail_in = (uInt)bytes_avail;
2930 zip->stream.total_in = 0;
2931 zip->stream.next_out = mp;
2932 zip->stream.avail_out = (uInt)metadata_bytes;
2933 zip->stream.total_out = 0;
2935 r = inflate(&zip->stream, 0);
2943 archive_set_error(&a->archive, ENOMEM,
2944 "Out of memory for ZIP decompression");
2945 ret = ARCHIVE_FATAL;
2946 goto exit_mac_metadata;
2948 archive_set_error(&a->archive,
2950 "ZIP decompression failed (%d)", r);
2951 ret = ARCHIVE_FATAL;
2952 goto exit_mac_metadata;
2954 bytes_used = zip->stream.total_in;
2955 metadata_bytes -= zip->stream.total_out;
2956 mp += zip->stream.total_out;
2964 __archive_read_consume(a, bytes_used);
2965 remaining_bytes -= bytes_used;
2967 archive_entry_copy_mac_metadata(entry, metadata,
2968 (size_t)rsrc->uncompressed_size - metadata_bytes);
2971 __archive_read_seek(a, offset, SEEK_SET);
2972 zip->decompress_init = 0;
2978 archive_read_format_zip_seekable_read_header(struct archive_read *a,
2979 struct archive_entry *entry)
2981 struct zip *zip = (struct zip *)a->format->data;
2982 struct zip_entry *rsrc;
2984 int r, ret = ARCHIVE_OK;
2987 * It should be sufficient to call archive_read_next_header() for
2988 * a reader to determine if an entry is encrypted or not. If the
2989 * encryption of an entry is only detectable when calling
2990 * archive_read_data(), so be it. We'll do the same check there
2993 if (zip->has_encrypted_entries ==
2994 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
2995 zip->has_encrypted_entries = 0;
2997 a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
2998 if (a->archive.archive_format_name == NULL)
2999 a->archive.archive_format_name = "ZIP";
3001 if (zip->zip_entries == NULL) {
3002 r = slurp_central_directory(a, zip);
3003 if (r != ARCHIVE_OK)
3005 /* Get first entry whose local header offset is lower than
3006 * other entries in the archive file. */
3008 (struct zip_entry *)ARCHIVE_RB_TREE_MIN(&zip->tree);
3009 } else if (zip->entry != NULL) {
3010 /* Get next entry in local header offset order. */
3011 zip->entry = (struct zip_entry *)__archive_rb_tree_iterate(
3012 &zip->tree, &zip->entry->node, ARCHIVE_RB_DIR_RIGHT);
3015 if (zip->entry == NULL)
3018 if (zip->entry->rsrcname.s)
3019 rsrc = (struct zip_entry *)__archive_rb_tree_find_node(
3020 &zip->tree_rsrc, zip->entry->rsrcname.s);
3024 if (zip->cctx_valid)
3025 archive_decrypto_aes_ctr_release(&zip->cctx);
3026 if (zip->hctx_valid)
3027 archive_hmac_sha1_cleanup(&zip->hctx);
3028 zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
3029 __archive_read_reset_passphrase(a);
3031 /* File entries are sorted by the header offset, we should mostly
3032 * use __archive_read_consume to advance a read point to avoid redundant
3034 offset = archive_filter_bytes(&a->archive, 0);
3035 if (offset < zip->entry->local_header_offset)
3036 __archive_read_consume(a,
3037 zip->entry->local_header_offset - offset);
3038 else if (offset != zip->entry->local_header_offset) {
3039 __archive_read_seek(a, zip->entry->local_header_offset,
3042 zip->unconsumed = 0;
3043 r = zip_read_local_file_header(a, entry, zip);
3044 if (r != ARCHIVE_OK)
3047 int ret2 = zip_read_mac_metadata(a, entry, rsrc);
3055 * We're going to seek for the next header anyway, so we don't
3056 * need to bother doing anything here.
3059 archive_read_format_zip_read_data_skip_seekable(struct archive_read *a)
3062 zip = (struct zip *)(a->format->data);
3064 zip->unconsumed = 0;
3065 return (ARCHIVE_OK);
3069 archive_read_support_format_zip_seekable(struct archive *_a)
3071 struct archive_read *a = (struct archive_read *)_a;
3075 archive_check_magic(_a, ARCHIVE_READ_MAGIC,
3076 ARCHIVE_STATE_NEW, "archive_read_support_format_zip_seekable");
3078 zip = (struct zip *)calloc(1, sizeof(*zip));
3080 archive_set_error(&a->archive, ENOMEM,
3081 "Can't allocate zip data");
3082 return (ARCHIVE_FATAL);
3085 #ifdef HAVE_COPYFILE_H
3086 /* Set this by default on Mac OS. */
3087 zip->process_mac_extensions = 1;
3091 * Until enough data has been read, we cannot tell about
3092 * any encrypted entries yet.
3094 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
3095 zip->crc32func = real_crc32;
3097 r = __archive_read_register_format(a,
3100 archive_read_format_zip_seekable_bid,
3101 archive_read_format_zip_options,
3102 archive_read_format_zip_seekable_read_header,
3103 archive_read_format_zip_read_data,
3104 archive_read_format_zip_read_data_skip_seekable,
3106 archive_read_format_zip_cleanup,
3107 archive_read_support_format_zip_capabilities_seekable,
3108 archive_read_format_zip_has_encrypted_entries);
3110 if (r != ARCHIVE_OK)
3112 return (ARCHIVE_OK);