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comparison: modules/zlib/src/zutil.c

modules/zlib/src/zutil.c

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1 /* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2005, 2010, 2011, 2012 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 #ifndef NO_DUMMY_DECL
14 struct internal_state {int dummy;}; /* for buggy compilers */
15 #endif
16
17 z_const char * const z_errmsg[10] = {
18 "need dictionary", /* Z_NEED_DICT 2 */
19 "stream end", /* Z_STREAM_END 1 */
20 "", /* Z_OK 0 */
21 "file error", /* Z_ERRNO (-1) */
22 "stream error", /* Z_STREAM_ERROR (-2) */
23 "data error", /* Z_DATA_ERROR (-3) */
24 "insufficient memory", /* Z_MEM_ERROR (-4) */
25 "buffer error", /* Z_BUF_ERROR (-5) */
26 "incompatible version",/* Z_VERSION_ERROR (-6) */
27 ""};
28
29
30 const char * ZEXPORT zlibVersion()
31 {
32 return ZLIB_VERSION;
33 }
34
35 uLong ZEXPORT zlibCompileFlags()
36 {
37 uLong flags;
38
39 flags = 0;
40 switch ((int)(sizeof(uInt))) {
41 case 2: break;
42 case 4: flags += 1; break;
43 case 8: flags += 2; break;
44 default: flags += 3;
45 }
46 switch ((int)(sizeof(uLong))) {
47 case 2: break;
48 case 4: flags += 1 << 2; break;
49 case 8: flags += 2 << 2; break;
50 default: flags += 3 << 2;
51 }
52 switch ((int)(sizeof(voidpf))) {
53 case 2: break;
54 case 4: flags += 1 << 4; break;
55 case 8: flags += 2 << 4; break;
56 default: flags += 3 << 4;
57 }
58 switch ((int)(sizeof(z_off_t))) {
59 case 2: break;
60 case 4: flags += 1 << 6; break;
61 case 8: flags += 2 << 6; break;
62 default: flags += 3 << 6;
63 }
64 #ifdef DEBUG
65 flags += 1 << 8;
66 #endif
67 #if defined(ASMV) || defined(ASMINF)
68 flags += 1 << 9;
69 #endif
70 #ifdef ZLIB_WINAPI
71 flags += 1 << 10;
72 #endif
73 #ifdef BUILDFIXED
74 flags += 1 << 12;
75 #endif
76 #ifdef DYNAMIC_CRC_TABLE
77 flags += 1 << 13;
78 #endif
79 #ifdef NO_GZCOMPRESS
80 flags += 1L << 16;
81 #endif
82 #ifdef NO_GZIP
83 flags += 1L << 17;
84 #endif
85 #ifdef PKZIP_BUG_WORKAROUND
86 flags += 1L << 20;
87 #endif
88 #ifdef FASTEST
89 flags += 1L << 21;
90 #endif
91 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
92 # ifdef NO_vsnprintf
93 flags += 1L << 25;
94 # ifdef HAS_vsprintf_void
95 flags += 1L << 26;
96 # endif
97 # else
98 # ifdef HAS_vsnprintf_void
99 flags += 1L << 26;
100 # endif
101 # endif
102 #else
103 flags += 1L << 24;
104 # ifdef NO_snprintf
105 flags += 1L << 25;
106 # ifdef HAS_sprintf_void
107 flags += 1L << 26;
108 # endif
109 # else
110 # ifdef HAS_snprintf_void
111 flags += 1L << 26;
112 # endif
113 # endif
114 #endif
115 return flags;
116 }
117
118 #ifdef DEBUG
119
120 # ifndef verbose
121 # define verbose 0
122 # endif
123 int ZLIB_INTERNAL z_verbose = verbose;
124
125 void ZLIB_INTERNAL z_error (m)
126 char *m;
127 {
128 fprintf(stderr, "%s\n", m);
129 exit(1);
130 }
131 #endif
132
133 /* exported to allow conversion of error code to string for compress() and
134 * uncompress()
135 */
136 const char * ZEXPORT zError(err)
137 int err;
138 {
139 return ERR_MSG(err);
140 }
141
142 #if defined(_WIN32_WCE)
143 /* The Microsoft C Run-Time Library for Windows CE doesn't have
144 * errno. We define it as a global variable to simplify porting.
145 * Its value is always 0 and should not be used.
146 */
147 int errno = 0;
148 #endif
149
150 #ifndef HAVE_MEMCPY
151
152 void ZLIB_INTERNAL zmemcpy(dest, source, len)
153 Bytef* dest;
154 const Bytef* source;
155 uInt len;
156 {
157 if (len == 0) return;
158 do {
159 *dest++ = *source++; /* ??? to be unrolled */
160 } while (--len != 0);
161 }
162
163 int ZLIB_INTERNAL zmemcmp(s1, s2, len)
164 const Bytef* s1;
165 const Bytef* s2;
166 uInt len;
167 {
168 uInt j;
169
170 for (j = 0; j < len; j++) {
171 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
172 }
173 return 0;
174 }
175
176 void ZLIB_INTERNAL zmemzero(dest, len)
177 Bytef* dest;
178 uInt len;
179 {
180 if (len == 0) return;
181 do {
182 *dest++ = 0; /* ??? to be unrolled */
183 } while (--len != 0);
184 }
185 #endif
186
187 #ifndef Z_SOLO
188
189 #ifdef SYS16BIT
190
191 #ifdef __TURBOC__
192 /* Turbo C in 16-bit mode */
193
194 # define MY_ZCALLOC
195
196 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
197 * and farmalloc(64K) returns a pointer with an offset of 8, so we
198 * must fix the pointer. Warning: the pointer must be put back to its
199 * original form in order to free it, use zcfree().
200 */
201
202 #define MAX_PTR 10
203 /* 10*64K = 640K */
204
205 local int next_ptr = 0;
206
207 typedef struct ptr_table_s {
208 voidpf org_ptr;
209 voidpf new_ptr;
210 } ptr_table;
211
212 local ptr_table table[MAX_PTR];
213 /* This table is used to remember the original form of pointers
214 * to large buffers (64K). Such pointers are normalized with a zero offset.
215 * Since MSDOS is not a preemptive multitasking OS, this table is not
216 * protected from concurrent access. This hack doesn't work anyway on
217 * a protected system like OS/2. Use Microsoft C instead.
218 */
219
220 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
221 {
222 voidpf buf = opaque; /* just to make some compilers happy */
223 ulg bsize = (ulg)items*size;
224
225 /* If we allocate less than 65520 bytes, we assume that farmalloc
226 * will return a usable pointer which doesn't have to be normalized.
227 */
228 if (bsize < 65520L) {
229 buf = farmalloc(bsize);
230 if (*(ush*)&buf != 0) return buf;
231 } else {
232 buf = farmalloc(bsize + 16L);
233 }
234 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
235 table[next_ptr].org_ptr = buf;
236
237 /* Normalize the pointer to seg:0 */
238 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
239 *(ush*)&buf = 0;
240 table[next_ptr++].new_ptr = buf;
241 return buf;
242 }
243
244 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
245 {
246 int n;
247 if (*(ush*)&ptr != 0) { /* object < 64K */
248 farfree(ptr);
249 return;
250 }
251 /* Find the original pointer */
252 for (n = 0; n < next_ptr; n++) {
253 if (ptr != table[n].new_ptr) continue;
254
255 farfree(table[n].org_ptr);
256 while (++n < next_ptr) {
257 table[n-1] = table[n];
258 }
259 next_ptr--;
260 return;
261 }
262 ptr = opaque; /* just to make some compilers happy */
263 Assert(0, "zcfree: ptr not found");
264 }
265
266 #endif /* __TURBOC__ */
267
268
269 #ifdef M_I86
270 /* Microsoft C in 16-bit mode */
271
272 # define MY_ZCALLOC
273
274 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
275 # define _halloc halloc
276 # define _hfree hfree
277 #endif
278
279 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
280 {
281 if (opaque) opaque = 0; /* to make compiler happy */
282 return _halloc((long)items, size);
283 }
284
285 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
286 {
287 if (opaque) opaque = 0; /* to make compiler happy */
288 _hfree(ptr);
289 }
290
291 #endif /* M_I86 */
292
293 #endif /* SYS16BIT */
294
295
296 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
297
298 #ifndef STDC
299 extern voidp malloc OF((uInt size));
300 extern voidp calloc OF((uInt items, uInt size));
301 extern void free OF((voidpf ptr));
302 #endif
303
304 voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
305 voidpf opaque;
306 unsigned items;
307 unsigned size;
308 {
309 if (opaque) items += size - size; /* make compiler happy */
310 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
311 (voidpf)calloc(items, size);
312 }
313
314 void ZLIB_INTERNAL zcfree (opaque, ptr)
315 voidpf opaque;
316 voidpf ptr;
317 {
318 free(ptr);
319 if (opaque) return; /* make compiler happy */
320 }
321
322 #endif /* MY_ZCALLOC */
323
324 #endif /* !Z_SOLO */

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