Mercurial > hgrepos > Python2 > PyMuPDF

comparison mupdf-source/thirdparty/zlib/zutil.c @ 2:b50eed0cc0ef upstream

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
parents
children
comparison
equal deleted inserted replaced
1:1d09e1dec1d9 2:b50eed0cc0ef
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
4 */
5
6 /* @(#) $Id$ */
7
8 #include "zutil.h"
9 #ifndef Z_SOLO
10 # include "gzguts.h"
11 #endif
12
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) */
23 (z_const char *)""
24 };
25
26
27 const char * ZEXPORT zlibVersion(void) {
28 return ZLIB_VERSION;
29 }
30
31 uLong ZEXPORT zlibCompileFlags(void) {
32 uLong flags;
33
34 flags = 0;
35 switch ((int)(sizeof(uInt))) {
36 case 2: break;
37 case 4: flags += 1; break;
38 case 8: flags += 2; break;
39 default: flags += 3;
40 }
41 switch ((int)(sizeof(uLong))) {
42 case 2: break;
43 case 4: flags += 1 << 2; break;
44 case 8: flags += 2 << 2; break;
45 default: flags += 3 << 2;
46 }
47 switch ((int)(sizeof(voidpf))) {
48 case 2: break;
49 case 4: flags += 1 << 4; break;
50 case 8: flags += 2 << 4; break;
51 default: flags += 3 << 4;
52 }
53 switch ((int)(sizeof(z_off_t))) {
54 case 2: break;
55 case 4: flags += 1 << 6; break;
56 case 8: flags += 2 << 6; break;
57 default: flags += 3 << 6;
58 }
59 #ifdef ZLIB_DEBUG
60 flags += 1 << 8;
61 #endif
62 /*
63 #if defined(ASMV) || defined(ASMINF)
64 flags += 1 << 9;
65 #endif
66 */
67 #ifdef ZLIB_WINAPI
68 flags += 1 << 10;
69 #endif
70 #ifdef BUILDFIXED
71 flags += 1 << 12;
72 #endif
73 #ifdef DYNAMIC_CRC_TABLE
74 flags += 1 << 13;
75 #endif
76 #ifdef NO_GZCOMPRESS
77 flags += 1L << 16;
78 #endif
79 #ifdef NO_GZIP
80 flags += 1L << 17;
81 #endif
82 #ifdef PKZIP_BUG_WORKAROUND
83 flags += 1L << 20;
84 #endif
85 #ifdef FASTEST
86 flags += 1L << 21;
87 #endif
88 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
89 # ifdef NO_vsnprintf
90 flags += 1L << 25;
91 # ifdef HAS_vsprintf_void
92 flags += 1L << 26;
93 # endif
94 # else
95 # ifdef HAS_vsnprintf_void
96 flags += 1L << 26;
97 # endif
98 # endif
99 #else
100 flags += 1L << 24;
101 # ifdef NO_snprintf
102 flags += 1L << 25;
103 # ifdef HAS_sprintf_void
104 flags += 1L << 26;
105 # endif
106 # else
107 # ifdef HAS_snprintf_void
108 flags += 1L << 26;
109 # endif
110 # endif
111 #endif
112 return flags;
113 }
114
115 #ifdef ZLIB_DEBUG
116 #include <stdlib.h>
117 # ifndef verbose
118 # define verbose 0
119 # endif
120 int ZLIB_INTERNAL z_verbose = verbose;
121
122 void ZLIB_INTERNAL z_error(char *m) {
123 fprintf(stderr, "%s\n", m);
124 exit(1);
125 }
126 #endif
127
128 /* exported to allow conversion of error code to string for compress() and
129 * uncompress()
130 */
131 const char * ZEXPORT zError(int err) {
132 return ERR_MSG(err);
133 }
134
135 #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800
136 /* The older Microsoft C Run-Time Library for Windows CE doesn't have
137 * errno. We define it as a global variable to simplify porting.
138 * Its value is always 0 and should not be used.
139 */
140 int errno = 0;
141 #endif
142
143 #ifndef HAVE_MEMCPY
144
145 void ZLIB_INTERNAL zmemcpy(Bytef* dest, const Bytef* source, uInt len) {
146 if (len == 0) return;
147 do {
148 *dest++ = *source++; /* ??? to be unrolled */
149 } while (--len != 0);
150 }
151
152 int ZLIB_INTERNAL zmemcmp(const Bytef* s1, const Bytef* s2, uInt len) {
153 uInt j;
154
155 for (j = 0; j < len; j++) {
156 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
157 }
158 return 0;
159 }
160
161 void ZLIB_INTERNAL zmemzero(Bytef* dest, uInt len) {
162 if (len == 0) return;
163 do {
164 *dest++ = 0; /* ??? to be unrolled */
165 } while (--len != 0);
166 }
167 #endif
168
169 #ifndef Z_SOLO
170
171 #ifdef SYS16BIT
172
173 #ifdef __TURBOC__
174 /* Turbo C in 16-bit mode */
175
176 # define MY_ZCALLOC
177
178 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
179 * and farmalloc(64K) returns a pointer with an offset of 8, so we
180 * must fix the pointer. Warning: the pointer must be put back to its
181 * original form in order to free it, use zcfree().
182 */
183
184 #define MAX_PTR 10
185 /* 10*64K = 640K */
186
187 local int next_ptr = 0;
188
189 typedef struct ptr_table_s {
190 voidpf org_ptr;
191 voidpf new_ptr;
192 } ptr_table;
193
194 local ptr_table table[MAX_PTR];
195 /* This table is used to remember the original form of pointers
196 * to large buffers (64K). Such pointers are normalized with a zero offset.
197 * Since MSDOS is not a preemptive multitasking OS, this table is not
198 * protected from concurrent access. This hack doesn't work anyway on
199 * a protected system like OS/2. Use Microsoft C instead.
200 */
201
202 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) {
203 voidpf buf;
204 ulg bsize = (ulg)items*size;
205
206 (void)opaque;
207
208 /* If we allocate less than 65520 bytes, we assume that farmalloc
209 * will return a usable pointer which doesn't have to be normalized.
210 */
211 if (bsize < 65520L) {
212 buf = farmalloc(bsize);
213 if (*(ush*)&buf != 0) return buf;
214 } else {
215 buf = farmalloc(bsize + 16L);
216 }
217 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
218 table[next_ptr].org_ptr = buf;
219
220 /* Normalize the pointer to seg:0 */
221 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
222 *(ush*)&buf = 0;
223 table[next_ptr++].new_ptr = buf;
224 return buf;
225 }
226
227 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
228 int n;
229
230 (void)opaque;
231
232 if (*(ush*)&ptr != 0) { /* object < 64K */
233 farfree(ptr);
234 return;
235 }
236 /* Find the original pointer */
237 for (n = 0; n < next_ptr; n++) {
238 if (ptr != table[n].new_ptr) continue;
239
240 farfree(table[n].org_ptr);
241 while (++n < next_ptr) {
242 table[n-1] = table[n];
243 }
244 next_ptr--;
245 return;
246 }
247 Assert(0, "zcfree: ptr not found");
248 }
249
250 #endif /* __TURBOC__ */
251
252
253 #ifdef M_I86
254 /* Microsoft C in 16-bit mode */
255
256 # define MY_ZCALLOC
257
258 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
259 # define _halloc halloc
260 # define _hfree hfree
261 #endif
262
263 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size) {
264 (void)opaque;
265 return _halloc((long)items, size);
266 }
267
268 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
269 (void)opaque;
270 _hfree(ptr);
271 }
272
273 #endif /* M_I86 */
274
275 #endif /* SYS16BIT */
276
277
278 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
279
280 #ifndef STDC
281 extern voidp malloc(uInt size);
282 extern voidp calloc(uInt items, uInt size);
283 extern void free(voidpf ptr);
284 #endif
285
286 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) {
287 (void)opaque;
288 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
289 (voidpf)calloc(items, size);
290 }
291
292 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
293 (void)opaque;
294 free(ptr);
295 }
296
297 #endif /* MY_ZCALLOC */
298
299 #endif /* !Z_SOLO */