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1 | /* zutil.c -- target dependent utility functions for the compression library |
2 | * Copyright (C) 1995-2003 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 | #ifndef STDC |
15 | extern void exit OF((int)); |
16 | #endif |
17 | |
18 | const char * const z_errmsg[10] = { |
19 | "need dictionary", /* Z_NEED_DICT 2 */ |
20 | "stream end", /* Z_STREAM_END 1 */ |
21 | "", /* Z_OK 0 */ |
22 | "file error", /* Z_ERRNO (-1) */ |
23 | "stream error", /* Z_STREAM_ERROR (-2) */ |
24 | "data error", /* Z_DATA_ERROR (-3) */ |
25 | "insufficient memory", /* Z_MEM_ERROR (-4) */ |
26 | "buffer error", /* Z_BUF_ERROR (-5) */ |
27 | "incompatible version",/* Z_VERSION_ERROR (-6) */ |
28 | ""}; |
29 | |
30 | |
31 | const char * ZEXPORT zlibVersion() |
32 | { |
33 | return ZLIB_VERSION; |
34 | } |
35 | |
36 | uLong ZEXPORT zlibCompileFlags() |
37 | { |
38 | uLong flags; |
39 | |
40 | flags = 0; |
41 | switch (sizeof(uInt)) { |
42 | case 2: break; |
43 | case 4: flags += 1; break; |
44 | case 8: flags += 2; break; |
45 | default: flags += 3; |
46 | } |
47 | switch (sizeof(uLong)) { |
48 | case 2: break; |
49 | case 4: flags += 1 << 2; break; |
50 | case 8: flags += 2 << 2; break; |
51 | default: flags += 3 << 2; |
52 | } |
53 | switch (sizeof(voidpf)) { |
54 | case 2: break; |
55 | case 4: flags += 1 << 4; break; |
56 | case 8: flags += 2 << 4; break; |
57 | default: flags += 3 << 4; |
58 | } |
59 | switch (sizeof(z_off_t)) { |
60 | case 2: break; |
61 | case 4: flags += 1 << 6; break; |
62 | case 8: flags += 2 << 6; break; |
63 | default: flags += 3 << 6; |
64 | } |
65 | #ifdef DEBUG |
66 | flags += 1 << 8; |
67 | #endif |
68 | #if defined(ASMV) || defined(ASMINF) |
69 | flags += 1 << 9; |
70 | #endif |
71 | #ifdef ZLIB_WINAPI |
72 | flags += 1 << 10; |
73 | #endif |
74 | #ifdef BUILDFIXED |
75 | flags += 1 << 12; |
76 | #endif |
77 | #ifdef DYNAMIC_CRC_TABLE |
78 | flags += 1 << 13; |
79 | #endif |
80 | #ifdef NO_GZCOMPRESS |
81 | flags += 1 << 16; |
82 | #endif |
83 | #ifdef NO_GZIP |
84 | flags += 1 << 17; |
85 | #endif |
86 | #ifdef PKZIP_BUG_WORKAROUND |
87 | flags += 1 << 20; |
88 | #endif |
89 | #ifdef FASTEST |
90 | flags += 1 << 21; |
91 | #endif |
92 | #ifdef STDC |
93 | # ifdef NO_vsnprintf |
94 | flags += 1 << 25; |
95 | # ifdef HAS_vsprintf_void |
96 | flags += 1 << 26; |
97 | # endif |
98 | # else |
99 | # ifdef HAS_vsnprintf_void |
100 | flags += 1 << 26; |
101 | # endif |
102 | # endif |
103 | #else |
104 | flags += 1 << 24; |
105 | # ifdef NO_snprintf |
106 | flags += 1 << 25; |
107 | # ifdef HAS_sprintf_void |
108 | flags += 1 << 26; |
109 | # endif |
110 | # else |
111 | # ifdef HAS_snprintf_void |
112 | flags += 1 << 26; |
113 | # endif |
114 | # endif |
115 | #endif |
116 | return flags; |
117 | } |
118 | |
119 | #ifdef DEBUG |
120 | |
121 | # ifndef verbose |
122 | # define verbose 0 |
123 | # endif |
124 | int z_verbose = verbose; |
125 | |
126 | void z_error (m) |
127 | char *m; |
128 | { |
129 | fprintf(stderr, "%s\n", m); |
130 | exit(1); |
131 | } |
132 | #endif |
133 | |
134 | /* exported to allow conversion of error code to string for compress() and |
135 | * uncompress() |
136 | */ |
137 | const char * ZEXPORT zError(err) |
138 | int err; |
139 | { |
140 | return ERR_MSG(err); |
141 | } |
142 | |
143 | #if defined(_WIN32_WCE) |
144 | /* does not exist on WCE */ |
145 | int errno = 0; |
146 | #endif |
147 | |
148 | #ifndef HAVE_MEMCPY |
149 | |
150 | void zmemcpy(dest, source, len) |
151 | Bytef* dest; |
152 | const Bytef* source; |
153 | uInt len; |
154 | { |
155 | if (len == 0) return; |
156 | do { |
157 | *dest++ = *source++; /* ??? to be unrolled */ |
158 | } while (--len != 0); |
159 | } |
160 | |
161 | int zmemcmp(s1, s2, len) |
162 | const Bytef* s1; |
163 | const Bytef* s2; |
164 | uInt len; |
165 | { |
166 | uInt j; |
167 | |
168 | for (j = 0; j < len; j++) { |
169 | if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; |
170 | } |
171 | return 0; |
172 | } |
173 | |
174 | void zmemzero(dest, len) |
175 | Bytef* dest; |
176 | uInt len; |
177 | { |
178 | if (len == 0) return; |
179 | do { |
180 | *dest++ = 0; /* ??? to be unrolled */ |
181 | } while (--len != 0); |
182 | } |
183 | #endif |
184 | |
185 | |
186 | #ifdef SYS16BIT |
187 | |
188 | #ifdef __TURBOC__ |
189 | /* Turbo C in 16-bit mode */ |
190 | |
191 | # define MY_ZCALLOC |
192 | |
193 | /* Turbo C malloc() does not allow dynamic allocation of 64K bytes |
194 | * and farmalloc(64K) returns a pointer with an offset of 8, so we |
195 | * must fix the pointer. Warning: the pointer must be put back to its |
196 | * original form in order to free it, use zcfree(). |
197 | */ |
198 | |
199 | #define MAX_PTR 10 |
200 | /* 10*64K = 640K */ |
201 | |
202 | local int next_ptr = 0; |
203 | |
204 | typedef struct ptr_table_s { |
205 | voidpf org_ptr; |
206 | voidpf new_ptr; |
207 | } ptr_table; |
208 | |
209 | local ptr_table table[MAX_PTR]; |
210 | /* This table is used to remember the original form of pointers |
211 | * to large buffers (64K). Such pointers are normalized with a zero offset. |
212 | * Since MSDOS is not a preemptive multitasking OS, this table is not |
213 | * protected from concurrent access. This hack doesn't work anyway on |
214 | * a protected system like OS/2. Use Microsoft C instead. |
215 | */ |
216 | |
217 | voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) |
218 | { |
219 | voidpf buf = opaque; /* just to make some compilers happy */ |
220 | ulg bsize = (ulg)items*size; |
221 | |
222 | /* If we allocate less than 65520 bytes, we assume that farmalloc |
223 | * will return a usable pointer which doesn't have to be normalized. |
224 | */ |
225 | if (bsize < 65520L) { |
226 | buf = farmalloc(bsize); |
227 | if (*(ush*)&buf != 0) return buf; |
228 | } else { |
229 | buf = farmalloc(bsize + 16L); |
230 | } |
231 | if (buf == NULL || next_ptr >= MAX_PTR) return NULL; |
232 | table[next_ptr].org_ptr = buf; |
233 | |
234 | /* Normalize the pointer to seg:0 */ |
235 | *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; |
236 | *(ush*)&buf = 0; |
237 | table[next_ptr++].new_ptr = buf; |
238 | return buf; |
239 | } |
240 | |
241 | void zcfree (voidpf opaque, voidpf ptr) |
242 | { |
243 | int n; |
244 | if (*(ush*)&ptr != 0) { /* object < 64K */ |
245 | farfree(ptr); |
246 | return; |
247 | } |
248 | /* Find the original pointer */ |
249 | for (n = 0; n < next_ptr; n++) { |
250 | if (ptr != table[n].new_ptr) continue; |
251 | |
252 | farfree(table[n].org_ptr); |
253 | while (++n < next_ptr) { |
254 | table[n-1] = table[n]; |
255 | } |
256 | next_ptr--; |
257 | return; |
258 | } |
259 | ptr = opaque; /* just to make some compilers happy */ |
260 | Assert(0, "zcfree: ptr not found"); |
261 | } |
262 | |
263 | #endif /* __TURBOC__ */ |
264 | |
265 | |
266 | #ifdef M_I86 |
267 | /* Microsoft C in 16-bit mode */ |
268 | |
269 | # define MY_ZCALLOC |
270 | |
271 | #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) |
272 | # define _halloc halloc |
273 | # define _hfree hfree |
274 | #endif |
275 | |
276 | voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) |
277 | { |
278 | if (opaque) opaque = 0; /* to make compiler happy */ |
279 | return _halloc((long)items, size); |
280 | } |
281 | |
282 | void zcfree (voidpf opaque, voidpf ptr) |
283 | { |
284 | if (opaque) opaque = 0; /* to make compiler happy */ |
285 | _hfree(ptr); |
286 | } |
287 | |
288 | #endif /* M_I86 */ |
289 | |
290 | #endif /* SYS16BIT */ |
291 | |
292 | |
293 | #ifndef MY_ZCALLOC /* Any system without a special alloc function */ |
294 | |
295 | #ifndef STDC |
296 | extern voidp malloc OF((uInt size)); |
297 | extern voidp calloc OF((uInt items, uInt size)); |
298 | extern void free OF((voidpf ptr)); |
299 | #endif |
300 | |
301 | voidpf zcalloc (opaque, items, size) |
302 | voidpf opaque; |
303 | unsigned items; |
304 | unsigned size; |
305 | { |
306 | if (opaque) items += size - size; /* make compiler happy */ |
307 | return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : |
308 | (voidpf)calloc(items, size); |
309 | } |
310 | |
311 | void zcfree (opaque, ptr) |
312 | voidpf opaque; |
313 | voidpf ptr; |
314 | { |
315 | free(ptr); |
316 | if (opaque) return; /* make compiler happy */ |
317 | } |
318 | |
319 | #endif /* MY_ZCALLOC */ |