2 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
6 /* zutil.c -- target dependent utility functions for the compression library
7 * Copyright (C) 1995-2005 Jean-loup Gailly.
8 * For conditions of distribution and use, see copyright notice in zlib.h
11 #pragma ident "%Z%%M% %I% %E% SMI"
16 struct internal_state {int dummy;}; /* for buggy compilers */
19 const char * const z_errmsg[10] = {
20 "need dictionary", /* Z_NEED_DICT 2 */
21 "stream end", /* Z_STREAM_END 1 */
23 "file error", /* Z_ERRNO (-1) */
24 "stream error", /* Z_STREAM_ERROR (-2) */
25 "data error", /* Z_DATA_ERROR (-3) */
26 "insufficient memory", /* Z_MEM_ERROR (-4) */
27 "buffer error", /* Z_BUF_ERROR (-5) */
28 "incompatible version",/* Z_VERSION_ERROR (-6) */
32 const char * ZEXPORT zlibVersion()
37 uLong ZEXPORT zlibCompileFlags()
42 switch (sizeof(uInt)) {
44 case 4: flags += 1; break;
45 case 8: flags += 2; break;
48 switch (sizeof(uLong)) {
50 case 4: flags += 1 << 2; break;
51 case 8: flags += 2 << 2; break;
52 default: flags += 3 << 2;
54 switch (sizeof(voidpf)) {
56 case 4: flags += 1 << 4; break;
57 case 8: flags += 2 << 4; break;
58 default: flags += 3 << 4;
60 switch (sizeof(z_off_t)) {
62 case 4: flags += 1 << 6; break;
63 case 8: flags += 2 << 6; break;
64 default: flags += 3 << 6;
69 #if defined(ASMV) || defined(ASMINF)
78 #ifdef DYNAMIC_CRC_TABLE
87 #ifdef PKZIP_BUG_WORKAROUND
96 # ifdef HAS_vsprintf_void
100 # ifdef HAS_vsnprintf_void
108 # ifdef HAS_sprintf_void
112 # ifdef HAS_snprintf_void
125 int z_verbose = verbose;
130 fprintf(stderr, "%s\n", m);
135 /* exported to allow conversion of error code to string for compress() and
138 const char * ZEXPORT zError(err)
144 #if defined(_WIN32_WCE)
145 /* The Microsoft C Run-Time Library for Windows CE doesn't have
146 * errno. We define it as a global variable to simplify porting.
147 * Its value is always 0 and should not be used.
155 void zmemcpy(dest, source, len)
160 if (len == 0) return;
162 *dest++ = *source++; /* ??? to be unrolled */
163 } while (--len != 0);
166 int zmemcmp(s1, s2, len)
173 for (j = 0; j < len; j++) {
174 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
179 void zmemzero(dest, len)
183 if (len == 0) return;
185 *dest++ = 0; /* ??? to be unrolled */
186 } while (--len != 0);
194 /* Turbo C in 16-bit mode */
198 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
199 * and farmalloc(64K) returns a pointer with an offset of 8, so we
200 * must fix the pointer. Warning: the pointer must be put back to its
201 * original form in order to free it, use zcfree().
207 local int next_ptr = 0;
209 typedef struct ptr_table_s {
214 local ptr_table table[MAX_PTR];
215 /* This table is used to remember the original form of pointers
216 * to large buffers (64K). Such pointers are normalized with a zero offset.
217 * Since MSDOS is not a preemptive multitasking OS, this table is not
218 * protected from concurrent access. This hack doesn't work anyway on
219 * a protected system like OS/2. Use Microsoft C instead.
222 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
224 voidpf buf = opaque; /* just to make some compilers happy */
225 ulg bsize = (ulg)items*size;
227 /* If we allocate less than 65520 bytes, we assume that farmalloc
228 * will return a usable pointer which doesn't have to be normalized.
230 if (bsize < 65520L) {
231 buf = farmalloc(bsize);
232 if (*(ush*)&buf != 0) return buf;
234 buf = farmalloc(bsize + 16L);
236 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
237 table[next_ptr].org_ptr = buf;
239 /* Normalize the pointer to seg:0 */
240 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
242 table[next_ptr++].new_ptr = buf;
246 void zcfree (voidpf opaque, voidpf ptr)
249 if (*(ush*)&ptr != 0) { /* object < 64K */
253 /* Find the original pointer */
254 for (n = 0; n < next_ptr; n++) {
255 if (ptr != table[n].new_ptr) continue;
257 farfree(table[n].org_ptr);
258 while (++n < next_ptr) {
259 table[n-1] = table[n];
264 ptr = opaque; /* just to make some compilers happy */
265 Assert(0, "zcfree: ptr not found");
268 #endif /* __TURBOC__ */
272 /* Microsoft C in 16-bit mode */
276 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
277 # define _halloc halloc
278 # define _hfree hfree
281 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
283 if (opaque) opaque = 0; /* to make compiler happy */
284 return _halloc((long)items, size);
287 void zcfree (voidpf opaque, voidpf ptr)
289 if (opaque) opaque = 0; /* to make compiler happy */
295 #endif /* SYS16BIT */
298 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
301 extern voidp malloc OF((uInt size));
302 extern voidp calloc OF((uInt items, uInt size));
303 extern void free OF((voidpf ptr));
306 voidpf zcalloc (opaque, items, size)
311 if (opaque) items += size - size; /* make compiler happy */
312 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
313 (voidpf)calloc(items, size);
316 void zcfree (opaque, ptr)
321 if (opaque) return; /* make compiler happy */
324 #endif /* MY_ZCALLOC */