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Source at commit 1078 created 13 years 1 month ago. By azimutz, Put back message removed by mistake on r1061. | |
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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␊ |
4 | */␊ |
5 | ␊ |
6 | /* @(#) $Id$ */␊ |
7 | ␊ |
8 | #include "zutil.h"␊ |
9 | ␊ |
10 | extern void *calloc(size_t nmemb, size_t size);␊ |
11 | ␊ |
12 | #ifndef NO_DUMMY_DECL␊ |
13 | struct internal_state {int dummy;}; /* for buggy compilers */␊ |
14 | #endif␊ |
15 | ␊ |
16 | const char * const z_errmsg[10] = {␊ |
17 | "need dictionary", /* Z_NEED_DICT 2 */␊ |
18 | "stream end", /* Z_STREAM_END 1 */␊ |
19 | "", /* Z_OK 0 */␊ |
20 | "file error", /* Z_ERRNO (-1) */␊ |
21 | "stream error", /* Z_STREAM_ERROR (-2) */␊ |
22 | "data error", /* Z_DATA_ERROR (-3) */␊ |
23 | "insufficient memory", /* Z_MEM_ERROR (-4) */␊ |
24 | "buffer error", /* Z_BUF_ERROR (-5) */␊ |
25 | "incompatible version",/* Z_VERSION_ERROR (-6) */␊ |
26 | ""};␊ |
27 | ␊ |
28 | ␊ |
29 | const char * ZEXPORT zlibVersion()␊ |
30 | {␊ |
31 | return ZLIB_VERSION;␊ |
32 | }␊ |
33 | ␊ |
34 | uLong ZEXPORT zlibCompileFlags()␊ |
35 | {␊ |
36 | uLong flags;␊ |
37 | ␊ |
38 | flags = 0;␊ |
39 | switch ((int)(sizeof(uInt))) {␊ |
40 | case 2: break;␊ |
41 | case 4: flags += 1; break;␊ |
42 | case 8: flags += 2; break;␊ |
43 | default: flags += 3;␊ |
44 | }␊ |
45 | switch ((int)(sizeof(uLong))) {␊ |
46 | case 2: break;␊ |
47 | case 4: flags += 1 << 2; break;␊ |
48 | case 8: flags += 2 << 2; break;␊ |
49 | default: flags += 3 << 2;␊ |
50 | }␊ |
51 | switch ((int)(sizeof(voidpf))) {␊ |
52 | case 2: break;␊ |
53 | case 4: flags += 1 << 4; break;␊ |
54 | case 8: flags += 2 << 4; break;␊ |
55 | default: flags += 3 << 4;␊ |
56 | }␊ |
57 | switch ((int)(sizeof(z_off_t))) {␊ |
58 | case 2: break;␊ |
59 | case 4: flags += 1 << 6; break;␊ |
60 | case 8: flags += 2 << 6; break;␊ |
61 | default: flags += 3 << 6;␊ |
62 | }␊ |
63 | #ifdef DEBUG␊ |
64 | flags += 1 << 8;␊ |
65 | #endif␊ |
66 | #if defined(ASMV) || defined(ASMINF)␊ |
67 | flags += 1 << 9;␊ |
68 | #endif␊ |
69 | #ifdef ZLIB_WINAPI␊ |
70 | flags += 1 << 10;␊ |
71 | #endif␊ |
72 | #ifdef BUILDFIXED␊ |
73 | flags += 1 << 12;␊ |
74 | #endif␊ |
75 | #ifdef DYNAMIC_CRC_TABLE␊ |
76 | flags += 1 << 13;␊ |
77 | #endif␊ |
78 | #ifdef NO_GZCOMPRESS␊ |
79 | flags += 1L << 16;␊ |
80 | #endif␊ |
81 | #ifdef NO_GZIP␊ |
82 | flags += 1L << 17;␊ |
83 | #endif␊ |
84 | #ifdef PKZIP_BUG_WORKAROUND␊ |
85 | flags += 1L << 20;␊ |
86 | #endif␊ |
87 | #ifdef FASTEST␊ |
88 | flags += 1L << 21;␊ |
89 | #endif␊ |
90 | #ifdef STDC␊ |
91 | # ifdef NO_vsnprintf␊ |
92 | flags += 1L << 25;␊ |
93 | # ifdef HAS_vsprintf_void␊ |
94 | flags += 1L << 26;␊ |
95 | # endif␊ |
96 | # else␊ |
97 | # ifdef HAS_vsnprintf_void␊ |
98 | flags += 1L << 26;␊ |
99 | # endif␊ |
100 | # endif␊ |
101 | #else␊ |
102 | flags += 1L << 24;␊ |
103 | # ifdef NO_snprintf␊ |
104 | flags += 1L << 25;␊ |
105 | # ifdef HAS_sprintf_void␊ |
106 | flags += 1L << 26;␊ |
107 | # endif␊ |
108 | # else␊ |
109 | # ifdef HAS_snprintf_void␊ |
110 | flags += 1L << 26;␊ |
111 | # endif␊ |
112 | # endif␊ |
113 | #endif␊ |
114 | return flags;␊ |
115 | }␊ |
116 | ␊ |
117 | #ifdef DEBUG␊ |
118 | ␊ |
119 | # ifndef verbose␊ |
120 | # define verbose 0␊ |
121 | # endif␊ |
122 | int ZLIB_INTERNAL z_verbose = verbose;␊ |
123 | ␊ |
124 | void ZLIB_INTERNAL z_error (m)␊ |
125 | char *m;␊ |
126 | {␊ |
127 | fprintf(stderr, "%s\n", m);␊ |
128 | exit(1);␊ |
129 | }␊ |
130 | #endif␊ |
131 | ␊ |
132 | /* exported to allow conversion of error code to string for compress() and␊ |
133 | * uncompress()␊ |
134 | */␊ |
135 | const char * ZEXPORT zError(err)␊ |
136 | int err;␊ |
137 | {␊ |
138 | return ERR_MSG(err);␊ |
139 | }␊ |
140 | ␊ |
141 | #if defined(_WIN32_WCE)␊ |
142 | /* The 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.␊ |
145 | */␊ |
146 | int errno = 0;␊ |
147 | #endif␊ |
148 | ␊ |
149 | #ifndef HAVE_MEMCPY␊ |
150 | ␊ |
151 | void ZLIB_INTERNAL zmemcpy(dest, source, len)␊ |
152 | Bytef* dest;␊ |
153 | const Bytef* source;␊ |
154 | uInt len;␊ |
155 | {␊ |
156 | if (len == 0) return;␊ |
157 | do {␊ |
158 | *dest++ = *source++; /* ??? to be unrolled */␊ |
159 | } while (--len != 0);␊ |
160 | }␊ |
161 | ␊ |
162 | int ZLIB_INTERNAL zmemcmp(s1, s2, len)␊ |
163 | const Bytef* s1;␊ |
164 | const Bytef* s2;␊ |
165 | uInt len;␊ |
166 | {␊ |
167 | uInt j;␊ |
168 | ␊ |
169 | for (j = 0; j < len; j++) {␊ |
170 | if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;␊ |
171 | }␊ |
172 | return 0;␊ |
173 | }␊ |
174 | ␊ |
175 | void ZLIB_INTERNAL zmemzero(dest, len)␊ |
176 | Bytef* dest;␊ |
177 | uInt len;␊ |
178 | {␊ |
179 | if (len == 0) return;␊ |
180 | do {␊ |
181 | *dest++ = 0; /* ??? to be unrolled */␊ |
182 | } while (--len != 0);␊ |
183 | }␊ |
184 | #endif␊ |
185 | ␊ |
186 | ␊ |
187 | #ifdef SYS16BIT␊ |
188 | ␊ |
189 | #ifdef __TURBOC__␊ |
190 | /* Turbo C in 16-bit mode */␊ |
191 | ␊ |
192 | # define MY_ZCALLOC␊ |
193 | ␊ |
194 | /* Turbo C malloc() does not allow dynamic allocation of 64K bytes␊ |
195 | * and farmalloc(64K) returns a pointer with an offset of 8, so we␊ |
196 | * must fix the pointer. Warning: the pointer must be put back to its␊ |
197 | * original form in order to free it, use zcfree().␊ |
198 | */␊ |
199 | ␊ |
200 | #define MAX_PTR 10␊ |
201 | /* 10*64K = 640K */␊ |
202 | ␊ |
203 | local int next_ptr = 0;␊ |
204 | ␊ |
205 | typedef struct ptr_table_s {␊ |
206 | voidpf org_ptr;␊ |
207 | voidpf new_ptr;␊ |
208 | } ptr_table;␊ |
209 | ␊ |
210 | local ptr_table table[MAX_PTR];␊ |
211 | /* This table is used to remember the original form of pointers␊ |
212 | * to large buffers (64K). Such pointers are normalized with a zero offset.␊ |
213 | * Since MSDOS is not a preemptive multitasking OS, this table is not␊ |
214 | * protected from concurrent access. This hack doesn't work anyway on␊ |
215 | * a protected system like OS/2. Use Microsoft C instead.␊ |
216 | */␊ |
217 | ␊ |
218 | voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)␊ |
219 | {␊ |
220 | voidpf buf = opaque; /* just to make some compilers happy */␊ |
221 | ulg bsize = (ulg)items*size;␊ |
222 | ␊ |
223 | /* If we allocate less than 65520 bytes, we assume that farmalloc␊ |
224 | * will return a usable pointer which doesn't have to be normalized.␊ |
225 | */␊ |
226 | if (bsize < 65520L) {␊ |
227 | buf = farmalloc(bsize);␊ |
228 | if (*(ush*)&buf != 0) return buf;␊ |
229 | } else {␊ |
230 | buf = farmalloc(bsize + 16L);␊ |
231 | }␊ |
232 | if (buf == NULL || next_ptr >= MAX_PTR) return NULL;␊ |
233 | table[next_ptr].org_ptr = buf;␊ |
234 | ␊ |
235 | /* Normalize the pointer to seg:0 */␊ |
236 | *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;␊ |
237 | *(ush*)&buf = 0;␊ |
238 | table[next_ptr++].new_ptr = buf;␊ |
239 | return buf;␊ |
240 | }␊ |
241 | ␊ |
242 | void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)␊ |
243 | {␊ |
244 | int n;␊ |
245 | if (*(ush*)&ptr != 0) { /* object < 64K */␊ |
246 | farfree(ptr);␊ |
247 | return;␊ |
248 | }␊ |
249 | /* Find the original pointer */␊ |
250 | for (n = 0; n < next_ptr; n++) {␊ |
251 | if (ptr != table[n].new_ptr) continue;␊ |
252 | ␊ |
253 | farfree(table[n].org_ptr);␊ |
254 | while (++n < next_ptr) {␊ |
255 | table[n-1] = table[n];␊ |
256 | }␊ |
257 | next_ptr--;␊ |
258 | return;␊ |
259 | }␊ |
260 | ptr = opaque; /* just to make some compilers happy */␊ |
261 | Assert(0, "zcfree: ptr not found");␊ |
262 | }␊ |
263 | ␊ |
264 | #endif /* __TURBOC__ */␊ |
265 | ␊ |
266 | ␊ |
267 | #ifdef M_I86␊ |
268 | /* Microsoft C in 16-bit mode */␊ |
269 | ␊ |
270 | # define MY_ZCALLOC␊ |
271 | ␊ |
272 | #if (!defined(_MSC_VER) || (_MSC_VER <= 600))␊ |
273 | # define _halloc halloc␊ |
274 | # define _hfree hfree␊ |
275 | #endif␊ |
276 | ␊ |
277 | voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)␊ |
278 | {␊ |
279 | if (opaque) opaque = 0; /* to make compiler happy */␊ |
280 | return _halloc((long)items, size);␊ |
281 | }␊ |
282 | ␊ |
283 | void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)␊ |
284 | {␊ |
285 | if (opaque) opaque = 0; /* to make compiler happy */␊ |
286 | _hfree(ptr);␊ |
287 | }␊ |
288 | ␊ |
289 | #endif /* M_I86 */␊ |
290 | ␊ |
291 | #endif /* SYS16BIT */␊ |
292 | ␊ |
293 | ␊ |
294 | #ifndef MY_ZCALLOC /* Any system without a special alloc function */␊ |
295 | ␊ |
296 | #ifndef STDC␊ |
297 | //extern voidp malloc OF((uInt size));␊ |
298 | //extern voidp calloc OF((uInt items, uInt size));␊ |
299 | //extern void free OF((voidpf ptr));␊ |
300 | #endif␊ |
301 | ␊ |
302 | voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)␊ |
303 | voidpf opaque;␊ |
304 | unsigned items;␊ |
305 | unsigned size;␊ |
306 | {␊ |
307 | if (opaque) items += size - size; /* make compiler happy */␊ |
308 | return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :␊ |
309 | (voidpf)calloc(items, size);␊ |
310 | }␊ |
311 | ␊ |
312 | void ZLIB_INTERNAL zcfree (opaque, ptr)␊ |
313 | voidpf opaque;␊ |
314 | voidpf ptr;␊ |
315 | {␊ |
316 | free(ptr);␊ |
317 | if (opaque) return; /* make compiler happy */␊ |
318 | }␊ |
319 | ␊ |
320 | #endif /* MY_ZCALLOC */␊ |
321 |