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 #include "zutil.h"
7 #if !defined(Z_SOLO) && !defined(_KERNEL)
8 # include "gzguts.h"
9 #endif
10
11 z_const char * const z_errmsg[10] = {
12 (z_const char *)"need dictionary", /* Z_NEED_DICT 2 */
13 (z_const char *)"stream end", /* Z_STREAM_END 1 */
14 (z_const char *)"", /* Z_OK 0 */
15 (z_const char *)"file error", /* Z_ERRNO (-1) */
16 (z_const char *)"stream error", /* Z_STREAM_ERROR (-2) */
17 (z_const char *)"data error", /* Z_DATA_ERROR (-3) */
18 (z_const char *)"insufficient memory", /* Z_MEM_ERROR (-4) */
19 (z_const char *)"buffer error", /* Z_BUF_ERROR (-5) */
20 (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */
21 (z_const char *)""
22 };
23
24
zlibVersion(void)25 const char * ZEXPORT zlibVersion(void)
26 {
27 return ZLIB_VERSION;
28 }
29
zlibCompileFlags(void)30 uLong ZEXPORT zlibCompileFlags(void)
31 {
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 #if defined(ASMV) || defined(ASMINF)
63 flags += 1 << 9;
64 #endif
65 #ifdef ZLIB_WINAPI
66 flags += 1 << 10;
67 #endif
68 #ifdef BUILDFIXED
69 flags += 1 << 12;
70 #endif
71 #ifdef DYNAMIC_CRC_TABLE
72 flags += 1 << 13;
73 #endif
74 #ifdef NO_GZCOMPRESS
75 flags += 1L << 16;
76 #endif
77 #ifdef NO_GZIP
78 flags += 1L << 17;
79 #endif
80 #ifdef PKZIP_BUG_WORKAROUND
81 flags += 1L << 20;
82 #endif
83 #ifdef FASTEST
84 flags += 1L << 21;
85 #endif
86 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
87 # ifdef NO_vsnprintf
88 flags += 1L << 25;
89 # ifdef HAS_vsprintf_void
90 flags += 1L << 26;
91 # endif
92 # else
93 # ifdef HAS_vsnprintf_void
94 flags += 1L << 26;
95 # endif
96 # endif
97 #else
98 flags += 1L << 24;
99 # ifdef NO_snprintf
100 flags += 1L << 25;
101 # ifdef HAS_sprintf_void
102 flags += 1L << 26;
103 # endif
104 # else
105 # ifdef HAS_snprintf_void
106 flags += 1L << 26;
107 # endif
108 # endif
109 #endif
110 return flags;
111 }
112
113 #ifdef ZLIB_DEBUG
114 #include <stdlib.h>
115 # ifndef verbose
116 # define verbose 0
117 # endif
118 int ZLIB_INTERNAL z_verbose = verbose;
119
z_error(m)120 void ZLIB_INTERNAL z_error (m)
121 char *m;
122 {
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 */
zError(int err)131 const char * ZEXPORT zError(int err)
132 {
133 return ERR_MSG(err);
134 }
135
136 #if defined(_WIN32_WCE) && _WIN32_WCE < 0x800
137 /* The older Microsoft C Run-Time Library for Windows CE doesn't have
138 * errno. We define it as a global variable to simplify porting.
139 * Its value is always 0 and should not be used.
140 */
141 int errno = 0;
142 #endif
143
144 #if !defined(HAVE_MEMCPY) && !defined(_KERNEL)
145
zmemcpy(dest,source,len)146 void ZLIB_INTERNAL zmemcpy(dest, source, len)
147 Bytef* dest;
148 const Bytef* source;
149 uInt len;
150 {
151 if (len == 0) return;
152 do {
153 *dest++ = *source++; /* ??? to be unrolled */
154 } while (--len != 0);
155 }
156
zmemcmp(s1,s2,len)157 int ZLIB_INTERNAL zmemcmp(s1, s2, len)
158 const Bytef* s1;
159 const Bytef* s2;
160 uInt len;
161 {
162 uInt j;
163
164 for (j = 0; j < len; j++) {
165 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
166 }
167 return 0;
168 }
169
zmemzero(dest,len)170 void ZLIB_INTERNAL zmemzero(dest, len)
171 Bytef* dest;
172 uInt len;
173 {
174 if (len == 0) return;
175 do {
176 *dest++ = 0; /* ??? to be unrolled */
177 } while (--len != 0);
178 }
179 #endif
180
181 #ifndef Z_SOLO
182
183 #ifdef SYS16BIT
184
185 #ifdef __TURBOC__
186 /* Turbo C in 16-bit mode */
187
188 # define MY_ZCALLOC
189
190 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
191 * and farmalloc(64K) returns a pointer with an offset of 8, so we
192 * must fix the pointer. Warning: the pointer must be put back to its
193 * original form in order to free it, use zcfree().
194 */
195
196 #define MAX_PTR 10
197 /* 10*64K = 640K */
198
199 local int next_ptr = 0;
200
201 typedef struct ptr_table_s {
202 voidpf org_ptr;
203 voidpf new_ptr;
204 } ptr_table;
205
206 local ptr_table table[MAX_PTR];
207 /* This table is used to remember the original form of pointers
208 * to large buffers (64K). Such pointers are normalized with a zero offset.
209 * Since MSDOS is not a preemptive multitasking OS, this table is not
210 * protected from concurrent access. This hack doesn't work anyway on
211 * a protected system like OS/2. Use Microsoft C instead.
212 */
213
zcalloc(voidpf opaque,unsigned items,unsigned size)214 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
215 {
216 voidpf buf;
217 ulg bsize = (ulg)items*size;
218
219 (void)opaque;
220
221 /* If we allocate less than 65520 bytes, we assume that farmalloc
222 * will return a usable pointer which doesn't have to be normalized.
223 */
224 if (bsize < 65520L) {
225 buf = farmalloc(bsize);
226 if (*(ush*)&buf != 0) return buf;
227 } else {
228 buf = farmalloc(bsize + 16L);
229 }
230 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
231 table[next_ptr].org_ptr = buf;
232
233 /* Normalize the pointer to seg:0 */
234 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
235 *(ush*)&buf = 0;
236 table[next_ptr++].new_ptr = buf;
237 return buf;
238 }
239
zcfree(voidpf opaque,voidpf ptr)240 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
241 {
242 int n;
243
244 (void)opaque;
245
246 if (*(ush*)&ptr != 0) { /* object < 64K */
247 farfree(ptr);
248 return;
249 }
250 /* Find the original pointer */
251 for (n = 0; n < next_ptr; n++) {
252 if (ptr != table[n].new_ptr) continue;
253
254 farfree(table[n].org_ptr);
255 while (++n < next_ptr) {
256 table[n-1] = table[n];
257 }
258 next_ptr--;
259 return;
260 }
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
zcalloc(voidpf opaque,uInt items,uInt size)277 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
278 {
279 (void)opaque;
280 return _halloc((long)items, size);
281 }
282
zcfree(voidpf opaque,voidpf ptr)283 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
284 {
285 (void)opaque;
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
zcalloc(voidpf opaque,unsigned items,unsigned size)302 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
303 {
304 (void)opaque;
305 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
306 (voidpf)calloc(items, size);
307 }
308
zcfree(voidpf opaque,voidpf ptr)309 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
310 {
311 (void)opaque;
312 free(ptr);
313 }
314
315 #endif /* MY_ZCALLOC */
316
317 #endif /* !Z_SOLO */
318