1 /* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2005, 2010 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h
11 struct internal_state {int dummy;}; /* for buggy compilers */
14 const char * const z_errmsg[10] = {
15 "need dictionary", /* Z_NEED_DICT 2 */
16 "stream end", /* Z_STREAM_END 1 */
18 "file error", /* Z_ERRNO (-1) */
19 "stream error", /* Z_STREAM_ERROR (-2) */
20 "data error", /* Z_DATA_ERROR (-3) */
21 "insufficient memory", /* Z_MEM_ERROR (-4) */
22 "buffer error", /* Z_BUF_ERROR (-5) */
23 "incompatible version",/* Z_VERSION_ERROR (-6) */
27 const char * ZEXPORT zlibVersion()
32 uLong ZEXPORT zlibCompileFlags()
37 switch ((int)(sizeof(uInt))) {
39 case 4: flags += 1; break;
40 case 8: flags += 2; break;
43 switch ((int)(sizeof(uLong))) {
45 case 4: flags += 1 << 2; break;
46 case 8: flags += 2 << 2; break;
47 default: flags += 3 << 2;
49 switch ((int)(sizeof(voidpf))) {
51 case 4: flags += 1 << 4; break;
52 case 8: flags += 2 << 4; break;
53 default: flags += 3 << 4;
55 switch ((int)(sizeof(z_off_t))) {
57 case 4: flags += 1 << 6; break;
58 case 8: flags += 2 << 6; break;
59 default: flags += 3 << 6;
64 #if defined(ASMV) || defined(ASMINF)
73 #ifdef DYNAMIC_CRC_TABLE
82 #ifdef PKZIP_BUG_WORKAROUND
91 # ifdef HAS_vsprintf_void
95 # ifdef HAS_vsnprintf_void
103 # ifdef HAS_sprintf_void
107 # ifdef HAS_snprintf_void
120 int ZLIB_INTERNAL z_verbose = verbose;
122 void ZLIB_INTERNAL z_error (m)
125 fprintf(stderr, "%s\n", m);
130 /* exported to allow conversion of error code to string for compress() and
133 const char * ZEXPORT zError(err)
139 #if defined(_WIN32_WCE)
140 /* The Microsoft C Run-Time Library for Windows CE doesn't have
141 * errno. We define it as a global variable to simplify porting.
142 * Its value is always 0 and should not be used.
149 Bytef* ZLIB_INTERNAL zmemchr OF((const Bytef* source, int c, uInt len)) {
150 while (len-- != 0UL) {
151 if (*source == (unsigned char)c) return (Bytef*)source;
158 void ZLIB_INTERNAL zmemcpy(dest, source, len)
163 if (len == 0) return;
165 *dest++ = *source++; /* ??? to be unrolled */
166 } while (--len != 0);
169 int ZLIB_INTERNAL zmemcmp(s1, s2, len)
176 for (j = 0; j < len; j++) {
177 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
182 void ZLIB_INTERNAL zmemzero(dest, len)
186 if (len == 0) return;
188 *dest++ = 0; /* ??? to be unrolled */
189 } while (--len != 0);
197 /* Turbo C in 16-bit mode */
201 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
202 * and farmalloc(64K) returns a pointer with an offset of 8, so we
203 * must fix the pointer. Warning: the pointer must be put back to its
204 * original form in order to free it, use zcfree().
210 local int next_ptr = 0;
212 typedef struct ptr_table_s {
217 local ptr_table table[MAX_PTR];
218 /* This table is used to remember the original form of pointers
219 * to large buffers (64K). Such pointers are normalized with a zero offset.
220 * Since MSDOS is not a preemptive multitasking OS, this table is not
221 * protected from concurrent access. This hack doesn't work anyway on
222 * a protected system like OS/2. Use Microsoft C instead.
225 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
227 voidpf buf = opaque; /* just to make some compilers happy */
228 ulg bsize = (ulg)items*size;
230 /* If we allocate less than 65520 bytes, we assume that farmalloc
231 * will return a usable pointer which doesn't have to be normalized.
233 if (bsize < 65520L) {
234 buf = farmalloc(bsize);
235 if (*(ush*)&buf != 0) return buf;
237 buf = farmalloc(bsize + 16L);
239 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
240 table[next_ptr].org_ptr = buf;
242 /* Normalize the pointer to seg:0 */
243 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
245 table[next_ptr++].new_ptr = buf;
249 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
252 if (*(ush*)&ptr != 0) { /* object < 64K */
256 /* Find the original pointer */
257 for (n = 0; n < next_ptr; n++) {
258 if (ptr != table[n].new_ptr) continue;
260 farfree(table[n].org_ptr);
261 while (++n < next_ptr) {
262 table[n-1] = table[n];
267 ptr = opaque; /* just to make some compilers happy */
268 Assert(0, "zcfree: ptr not found");
271 #endif /* __TURBOC__ */
275 /* Microsoft C in 16-bit mode */
279 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
280 # define _halloc halloc
281 # define _hfree hfree
284 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
286 if (opaque) opaque = 0; /* to make compiler happy */
287 return _halloc((long)items, size);
290 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
292 if (opaque) opaque = 0; /* to make compiler happy */
298 #endif /* SYS16BIT */
301 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
304 extern voidp malloc OF((uInt size));
305 extern voidp calloc OF((uInt items, uInt size));
306 extern void free OF((voidpf ptr));
309 voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
314 if (opaque) items += size - size; /* make compiler happy */
315 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
316 (voidpf)calloc(items, size);
319 void ZLIB_INTERNAL zcfree (opaque, ptr)
324 if (opaque) return; /* make compiler happy */
327 #endif /* MY_ZCALLOC */