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
zlibVersion(void)27 const char * ZEXPORT zlibVersion(void)
28 {
29 return ZLIB_VERSION;
30 }
31
zlibCompileFlags(void)32 uLong ZEXPORT zlibCompileFlags(void)
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
z_error(char *m)124 void ZLIB_INTERNAL z_error(char *m)
125 {
126 fprintf(stderr, "%s\n", m);
127 exit(1);
128 }
129 #endif
130
131 /* exported to allow conversion of error code to string for compress() and
132 * uncompress()
133 */
zError(int err)134 const char * ZEXPORT zError(int err)
135 {
136 return ERR_MSG(err);
137 }
138
139 #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800
140 /* The older Microsoft C Run-Time Library for Windows CE doesn't have
141 * errno. We define it as a global variable to simplify porting.
142 * Its value is always 0 and should not be used.
143 */
144 int errno = 0;
145 #endif
146
147 #ifndef HAVE_MEMCPY
148
zmemcpy(Bytef* dest, const Bytef* source, uInt len)149 void ZLIB_INTERNAL zmemcpy(Bytef* dest, const Bytef* source, uInt len)
150 {
151 if (len == 0) return;
152 do {
153 *dest++ = *source++; /* ??? to be unrolled */
154 } while (--len != 0);
155 }
156
zmemcmp(const Bytef* s1, const Bytef* s2, uInt len)157 int ZLIB_INTERNAL zmemcmp(const Bytef* s1, const Bytef* s2, uInt len)
158 {
159 uInt j;
160
161 for (j = 0; j < len; j++) {
162 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
163 }
164 return 0;
165 }
166
zmemzero(Bytef* dest, uInt len)167 void ZLIB_INTERNAL zmemzero(Bytef* dest, uInt len)
168 {
169 if (len == 0) return;
170 do {
171 *dest++ = 0; /* ??? to be unrolled */
172 } while (--len != 0);
173 }
174 #endif
175
176 #ifndef Z_SOLO
177
178 #ifdef SYS16BIT
179
180 #ifdef __TURBOC__
181 /* Turbo C in 16-bit mode */
182
183 # define MY_ZCALLOC
184
185 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
186 * and farmalloc(64K) returns a pointer with an offset of 8, so we
187 * must fix the pointer. Warning: the pointer must be put back to its
188 * original form in order to free it, use zcfree().
189 */
190
191 #define MAX_PTR 10
192 /* 10*64K = 640K */
193
194 local int next_ptr = 0;
195
196 typedef struct ptr_table_s {
197 voidpf org_ptr;
198 voidpf new_ptr;
199 } ptr_table;
200
201 local ptr_table table[MAX_PTR];
202 /* This table is used to remember the original form of pointers
203 * to large buffers (64K). Such pointers are normalized with a zero offset.
204 * Since MSDOS is not a preemptive multitasking OS, this table is not
205 * protected from concurrent access. This hack doesn't work anyway on
206 * a protected system like OS/2. Use Microsoft C instead.
207 */
208
zcalloc(voidpf opaque, unsigned items, unsigned size)209 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size)
210 {
211 voidpf buf;
212 ulg bsize = (ulg)items*size;
213
214 (void)opaque;
215
216 /* If we allocate less than 65520 bytes, we assume that farmalloc
217 * will return a usable pointer which doesn't have to be normalized.
218 */
219 if (bsize < 65520L) {
220 buf = farmalloc(bsize);
221 if (*(ush*)&buf != 0) return buf;
222 } else {
223 buf = farmalloc(bsize + 16L);
224 }
225 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
226 table[next_ptr].org_ptr = buf;
227
228 /* Normalize the pointer to seg:0 */
229 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
230 *(ush*)&buf = 0;
231 table[next_ptr++].new_ptr = buf;
232 return buf;
233 }
234
zcfree(voidpf opaque, voidpf ptr)235 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr)
236 {
237 int n;
238
239 (void)opaque;
240
241 if (*(ush*)&ptr != 0) { /* object < 64K */
242 farfree(ptr);
243 return;
244 }
245 /* Find the original pointer */
246 for (n = 0; n < next_ptr; n++) {
247 if (ptr != table[n].new_ptr) continue;
248
249 farfree(table[n].org_ptr);
250 while (++n < next_ptr) {
251 table[n-1] = table[n];
252 }
253 next_ptr--;
254 return;
255 }
256 Assert(0, "zcfree: ptr not found");
257 }
258
259 #endif /* __TURBOC__ */
260
261
262 #ifdef M_I86
263 /* Microsoft C in 16-bit mode */
264
265 # define MY_ZCALLOC
266
267 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
268 # define _halloc halloc
269 # define _hfree hfree
270 #endif
271
zcalloc(voidpf opaque, uInt items, uInt size)272 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size)
273 {
274 (void)opaque;
275 return _halloc((long)items, size);
276 }
277
zcfree(voidpf opaque, voidpf ptr)278 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr)
279 {
280 (void)opaque;
281 _hfree(ptr);
282 }
283
284 #endif /* M_I86 */
285
286 #endif /* SYS16BIT */
287
288
289 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
290
291 #ifndef STDC
292 extern voidp malloc(uInt size);
293 extern voidp calloc(uInt items, uInt size);
294 extern void free(voidpf ptr);
295 #endif
296
zcalloc(voidpf opaque, unsigned items, unsigned size)297 voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size)
298 {
299 (void)opaque;
300 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
301 (voidpf)calloc(items, size);
302 }
303
zcfree(voidpf opaque, voidpf ptr)304 void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr)
305 {
306 (void)opaque;
307 free(ptr);
308 }
309
310 #endif /* MY_ZCALLOC */
311
312 #endif /* !Z_SOLO */
313