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