1 /* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2003 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 */
15 extern void exit OF((int));
18 const char * const z_errmsg[10] = {
19 "need dictionary", /* Z_NEED_DICT 2 */
20 "stream end", /* Z_STREAM_END 1 */
22 "file error", /* Z_ERRNO (-1) */
23 "stream error", /* Z_STREAM_ERROR (-2) */
24 "data error", /* Z_DATA_ERROR (-3) */
25 "insufficient memory", /* Z_MEM_ERROR (-4) */
26 "buffer error", /* Z_BUF_ERROR (-5) */
27 "incompatible version",/* Z_VERSION_ERROR (-6) */
31 const char * ZEXPORT zlibVersion()
36 uLong ZEXPORT zlibCompileFlags()
41 switch (sizeof(uInt)) {
43 case 4: flags += 1; break;
44 case 8: flags += 2; break;
47 switch (sizeof(uLong)) {
49 case 4: flags += 1 << 2; break;
50 case 8: flags += 2 << 2; break;
51 default: flags += 3 << 2;
53 switch (sizeof(voidpf)) {
55 case 4: flags += 1 << 4; break;
56 case 8: flags += 2 << 4; break;
57 default: flags += 3 << 4;
59 switch (sizeof(z_off_t)) {
61 case 4: flags += 1 << 6; break;
62 case 8: flags += 2 << 6; break;
63 default: flags += 3 << 6;
68 #if defined(ASMV) || defined(ASMINF)
77 #ifdef DYNAMIC_CRC_TABLE
86 #ifdef PKZIP_BUG_WORKAROUND
95 # ifdef HAS_vsprintf_void
99 # ifdef HAS_vsnprintf_void
107 # ifdef HAS_sprintf_void
111 # ifdef HAS_snprintf_void
124 int z_verbose = verbose;
129 fprintf(stderr, "%s\n", m);
134 /* exported to allow conversion of error code to string for compress() and
137 const char * ZEXPORT zError(err)
143 #if defined(_WIN32_WCE)
144 /* does not exist on WCE */
150 void zmemcpy(dest, source, len)
155 if (len == 0) return;
157 *dest++ = *source++; /* ??? to be unrolled */
158 } while (--len != 0);
161 int zmemcmp(s1, s2, len)
168 for (j = 0; j < len; j++) {
169 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
174 void zmemzero(dest, len)
178 if (len == 0) return;
180 *dest++ = 0; /* ??? to be unrolled */
181 } while (--len != 0);
189 /* Turbo C in 16-bit mode */
193 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
194 * and farmalloc(64K) returns a pointer with an offset of 8, so we
195 * must fix the pointer. Warning: the pointer must be put back to its
196 * original form in order to free it, use zcfree().
202 local int next_ptr = 0;
204 typedef struct ptr_table_s {
209 local ptr_table table[MAX_PTR];
210 /* This table is used to remember the original form of pointers
211 * to large buffers (64K). Such pointers are normalized with a zero offset.
212 * Since MSDOS is not a preemptive multitasking OS, this table is not
213 * protected from concurrent access. This hack doesn't work anyway on
214 * a protected system like OS/2. Use Microsoft C instead.
217 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
219 voidpf buf = opaque; /* just to make some compilers happy */
220 ulg bsize = (ulg)items*size;
222 /* If we allocate less than 65520 bytes, we assume that farmalloc
223 * will return a usable pointer which doesn't have to be normalized.
225 if (bsize < 65520L) {
226 buf = farmalloc(bsize);
227 if (*(ush*)&buf != 0) return buf;
229 buf = farmalloc(bsize + 16L);
231 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
232 table[next_ptr].org_ptr = buf;
234 /* Normalize the pointer to seg:0 */
235 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
237 table[next_ptr++].new_ptr = buf;
241 void zcfree (voidpf opaque, voidpf ptr)
244 if (*(ush*)&ptr != 0) { /* object < 64K */
248 /* Find the original pointer */
249 for (n = 0; n < next_ptr; n++) {
250 if (ptr != table[n].new_ptr) continue;
252 farfree(table[n].org_ptr);
253 while (++n < next_ptr) {
254 table[n-1] = table[n];
259 ptr = opaque; /* just to make some compilers happy */
260 Assert(0, "zcfree: ptr not found");
263 #endif /* __TURBOC__ */
267 /* Microsoft C in 16-bit mode */
271 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
272 # define _halloc halloc
273 # define _hfree hfree
276 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
278 if (opaque) opaque = 0; /* to make compiler happy */
279 return _halloc((long)items, size);
282 void zcfree (voidpf opaque, voidpf ptr)
284 if (opaque) opaque = 0; /* to make compiler happy */
290 #endif /* SYS16BIT */
293 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
296 extern voidp malloc OF((uInt size));
297 extern voidp calloc OF((uInt items, uInt size));
298 extern void free OF((voidpf ptr));
301 voidpf zcalloc (opaque, items, size)
306 if (opaque) items += size - size; /* make compiler happy */
307 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
308 (voidpf)calloc(items, size);
311 void zcfree (opaque, ptr)
316 if (opaque) return; /* make compiler happy */
319 #endif /* MY_ZCALLOC */