| Geant4 Cross Reference |
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()
28 {
29 return ZLIB_VERSION;
30 }
31
32 uLong ZEXPORT zlibCompileFlags()
33 {
34 uLong flags;
35
36 flags = 0;
37 switch ((int)(sizeof(uInt))) {
38 case 2: break;
39 case 4: flags += 1; break;
40 case 8: flags += 2; break;
41 default: flags += 3;
42 }
43 switch ((int)(sizeof(uLong))) {
44 case 2: break;
45 case 4: flags += 1 << 2; break;
46 case 8: flags += 2 << 2; break;
47 default: flags += 3 << 2;
48 }
49 switch ((int)(sizeof(voidpf))) {
50 case 2: break;
51 case 4: flags += 1 << 4; break;
52 case 8: flags += 2 << 4; break;
53 default: flags += 3 << 4;
54 }
55 switch ((int)(sizeof(z_off_t))) {
56 case 2: break;
57 case 4: flags += 1 << 6; break;
58 case 8: flags += 2 << 6; break;
59 default: flags += 3 << 6;
60 }
61 #ifdef ZLIB_DEBUG
62 flags += 1 << 8;
63 #endif
64 /*
65 #if defined(ASMV) || defined(ASMINF)
66 flags += 1 << 9;
67 #endif
68 */
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 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
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 ZLIB_DEBUG
118 #include <stdlib.h>
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) && _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.
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 #ifndef Z_SOLO
187
188 #ifdef SYS16BIT
189
190 #ifdef __TURBOC__
191 /* Turbo C in 16-bit mode */
192
193 # define MY_ZCALLOC
194
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().
199 */
200
201 #define MAX_PTR 10
202 /* 10*64K = 640K */
203
204 local int next_ptr = 0;
205
206 typedef struct ptr_table_s {
207 voidpf org_ptr;
208 voidpf new_ptr;
209 } ptr_table;
210
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.
217 */
218
219 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size)
220 {
221 voidpf buf;
222 ulg bsize = (ulg)items*size;
223
224 (void)opaque;
225
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.
228 */
229 if (bsize < 65520L) {
230 buf = farmalloc(bsize);
231 if (*(ush*)&buf != 0) return buf;
232 } else {
233 buf = farmalloc(bsize + 16L);
234 }
235 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
236 table[next_ptr].org_ptr = buf;
237
238 /* Normalize the pointer to seg:0 */
239 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
240 *(ush*)&buf = 0;
241 table[next_ptr++].new_ptr = buf;
242 return buf;
243 }
244
245 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr)
246 {
247 int n;
248
249 (void)opaque;
250
251 if (*(ush*)&ptr != 0) { /* object < 64K */
252 farfree(ptr);
253 return;
254 }
255 /* Find the original pointer */
256 for (n = 0; n < next_ptr; n++) {
257 if (ptr != table[n].new_ptr) continue;
258
259 farfree(table[n].org_ptr);
260 while (++n < next_ptr) {
261 table[n-1] = table[n];
262 }
263 next_ptr--;
264 return;
265 }
266 Assert(0, "zcfree: ptr not found");
267 }
268
269 #endif /* __TURBOC__ */
270
271
272 #ifdef M_I86
273 /* Microsoft C in 16-bit mode */
274
275 # define MY_ZCALLOC
276
277 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
278 # define _halloc halloc
279 # define _hfree hfree
280 #endif
281
282 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size)
283 {
284 (void)opaque;
285 return _halloc((long)items, size);
286 }
287
288 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr)
289 {
290 (void)opaque;
291 _hfree(ptr);
292 }
293
294 #endif /* M_I86 */
295
296 #endif /* SYS16BIT */
297
298
299 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
300
301 #ifndef STDC
302 extern voidp malloc OF((uInt size));
303 extern voidp calloc OF((uInt items, uInt size));
304 extern void free OF((voidpf ptr));
305 #endif
306
307 voidpf ZLIB_INTERNAL zcalloc(opaque, items, size)
308 voidpf opaque;
309 unsigned items;
310 unsigned size;
311 {
312 (void)opaque;
313 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
314 (voidpf)calloc(items, size);
315 }
316
317 void ZLIB_INTERNAL zcfree(opaque, ptr)
318 voidpf opaque;
319 voidpf ptr;
320 {
321 (void)opaque;
322 free(ptr);
323 }
324
325 #endif /* MY_ZCALLOC */
326
327 #endif /* !Z_SOLO */
328