1 /* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2017 Jean-loup Gailly
3 * For conditions of distribution and use, see copyright notice in zlib.h
13 z_const char * const z_errmsg[10] = {
14 (z_const char *)"need dictionary", /* Z_NEED_DICT 2 */
15 (z_const char *)"stream end", /* Z_STREAM_END 1 */
16 (z_const char *)"", /* Z_OK 0 */
17 (z_const char *)"file error", /* Z_ERRNO (-1) */
18 (z_const char *)"stream error", /* Z_STREAM_ERROR (-2) */
19 (z_const char *)"data error", /* Z_DATA_ERROR (-3) */
20 (z_const char *)"insufficient memory", /* Z_MEM_ERROR (-4) */
21 (z_const char *)"buffer error", /* Z_BUF_ERROR (-5) */
22 (z_const char *)"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;
65 #if defined(ASMV) || defined(ASMINF)
75 #ifdef DYNAMIC_CRC_TABLE
84 #ifdef PKZIP_BUG_WORKAROUND
90 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
93 # ifdef HAS_vsprintf_void
97 # ifdef HAS_vsnprintf_void
105 # ifdef HAS_sprintf_void
109 # ifdef HAS_snprintf_void
122 int ZLIB_INTERNAL z_verbose = verbose;
124 void ZLIB_INTERNAL z_error(m)
127 fprintf(stderr, "%s\n", m);
132 /* exported to allow conversion of error code to string for compress() and
135 const char * ZEXPORT zError(err)
141 #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800
142 /* The older Microsoft C Run-Time Library for Windows CE doesn't have
143 * errno. We define it as a global variable to simplify porting.
144 * Its value is always 0 and should not be used.
151 void ZLIB_INTERNAL zmemcpy(dest, source, len)
156 if (len == 0) return;
158 *dest++ = *source++; /* ??? to be unrolled */
159 } while (--len != 0);
162 int ZLIB_INTERNAL zmemcmp(s1, s2, len)
169 for (j = 0; j < len; j++) {
170 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
175 void ZLIB_INTERNAL zmemzero(dest, len)
179 if (len == 0) return;
181 *dest++ = 0; /* ??? to be unrolled */
182 } while (--len != 0);
191 /* Turbo C in 16-bit mode */
195 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
196 * and farmalloc(64K) returns a pointer with an offset of 8, so we
197 * must fix the pointer. Warning: the pointer must be put back to its
198 * original form in order to free it, use zcfree().
204 local int next_ptr = 0;
206 typedef struct ptr_table_s {
211 local ptr_table table[MAX_PTR];
212 /* This table is used to remember the original form of pointers
213 * to large buffers (64K). Such pointers are normalized with a zero offset.
214 * Since MSDOS is not a preemptive multitasking OS, this table is not
215 * protected from concurrent access. This hack doesn't work anyway on
216 * a protected system like OS/2. Use Microsoft C instead.
219 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size)
222 ulg bsize = (ulg)items*size;
226 /* If we allocate less than 65520 bytes, we assume that farmalloc
227 * will return a usable pointer which doesn't have to be normalized.
229 if (bsize < 65520L) {
230 buf = farmalloc(bsize);
231 if (*(ush*)&buf != 0) return buf;
233 buf = farmalloc(bsize + 16L);
235 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
236 table[next_ptr].org_ptr = buf;
238 /* Normalize the pointer to seg:0 */
239 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
241 table[next_ptr++].new_ptr = buf;
245 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr)
251 if (*(ush*)&ptr != 0) { /* object < 64K */
255 /* Find the original pointer */
256 for (n = 0; n < next_ptr; n++) {
257 if (ptr != table[n].new_ptr) continue;
259 farfree(table[n].org_ptr);
260 while (++n < next_ptr) {
261 table[n-1] = table[n];
266 Assert(0, "zcfree: ptr not found");
269 #endif /* __TURBOC__ */
273 /* Microsoft C in 16-bit mode */
277 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
278 # define _halloc halloc
279 # define _hfree hfree
282 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size)
285 return _halloc((long)items, size);
288 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr)
296 #endif /* SYS16BIT */
299 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
302 extern voidp malloc OF((uInt size));
303 extern voidp calloc OF((uInt items, uInt size));
304 extern void free OF((voidpf ptr));
307 voidpf ZLIB_INTERNAL zcalloc(opaque, items, size)
313 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
314 (voidpf)calloc(items, size);
317 void ZLIB_INTERNAL zcfree(opaque, ptr)
325 #endif /* MY_ZCALLOC */