1 /* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2005 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6 /* @(#) $Id: zutil.c,v 1.1 2007/06/07 17:54:37 jules_rms Exp $ */
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 (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 (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 (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 (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 #if 0
116
117 # ifndef verbose
118 # define verbose 0
119 # endif
120 int z_verbose = verbose;
121
122 void z_error (const char *m)
123 {
124 fprintf(stderr, "%s\n", m);
125 exit(1);
126 }
127 #endif
128
129 /* exported to allow conversion of error code to string for compress() and
130 * uncompress()
131 */
zError(int err)132 const char * ZEXPORT zError(int err)
133 {
134 return ERR_MSG(err);
135 }
136
137 #if defined(_WIN32_WCE)
138 /* The Microsoft C Run-Time Library for Windows CE doesn't have
139 * errno. We define it as a global variable to simplify porting.
140 * Its value is always 0 and should not be used.
141 */
142 int errno = 0;
143 #endif
144
145 #ifndef HAVE_MEMCPY
146
zmemcpy(dest,source,len)147 void zmemcpy(dest, source, len)
148 Bytef* dest;
149 const Bytef* source;
150 uInt len;
151 {
152 if (len == 0) return;
153 do {
154 *dest++ = *source++; /* ??? to be unrolled */
155 } while (--len != 0);
156 }
157
zmemcmp(s1,s2,len)158 int zmemcmp(s1, s2, len)
159 const Bytef* s1;
160 const Bytef* s2;
161 uInt len;
162 {
163 uInt j;
164
165 for (j = 0; j < len; j++) {
166 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
167 }
168 return 0;
169 }
170
zmemzero(dest,len)171 void zmemzero(dest, len)
172 Bytef* dest;
173 uInt len;
174 {
175 if (len == 0) return;
176 do {
177 *dest++ = 0; /* ??? to be unrolled */
178 } while (--len != 0);
179 }
180 #endif
181
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 zcalloc (voidpf opaque, unsigned items, unsigned size)
215 {
216 voidpf buf = opaque; /* just to make some compilers happy */
217 ulg bsize = (ulg)items*size;
218
219 /* If we allocate less than 65520 bytes, we assume that farmalloc
220 * will return a usable pointer which doesn't have to be normalized.
221 */
222 if (bsize < 65520L) {
223 buf = farmalloc(bsize);
224 if (*(ush*)&buf != 0) return buf;
225 } else {
226 buf = farmalloc(bsize + 16L);
227 }
228 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
229 table[next_ptr].org_ptr = buf;
230
231 /* Normalize the pointer to seg:0 */
232 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
233 *(ush*)&buf = 0;
234 table[next_ptr++].new_ptr = buf;
235 return buf;
236 }
237
zcfree(voidpf opaque,voidpf ptr)238 void zcfree (voidpf opaque, voidpf ptr)
239 {
240 int n;
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 ptr = opaque; /* just to make some compilers happy */
257 Assert(0, "zcfree: ptr not found");
258 }
259
260 #endif /* __TURBOC__ */
261
262
263 #ifdef M_I86
264 /* Microsoft C in 16-bit mode */
265
266 # define MY_ZCALLOC
267
268 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
269 # define _halloc halloc
270 # define _hfree hfree
271 #endif
272
zcalloc(voidpf opaque,unsigned items,unsigned size)273 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
274 {
275 if (opaque) opaque = 0; /* to make compiler happy */
276 return _halloc((long)items, size);
277 }
278
zcfree(voidpf opaque,voidpf ptr)279 void zcfree (voidpf opaque, voidpf ptr)
280 {
281 if (opaque) opaque = 0; /* to make compiler happy */
282 _hfree(ptr);
283 }
284
285 #endif /* M_I86 */
286
287 #endif /* SYS16BIT */
288
289
290 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
291
292 #ifndef STDC
293 extern voidp malloc OF((uInt size));
294 extern voidp calloc OF((uInt items, uInt size));
295 extern void free OF((voidpf ptr));
296 #endif
297
zcalloc(voidpf opaque,unsigned items,unsigned size)298 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
299 {
300 if (opaque) items += size - size; /* make compiler happy */
301 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
302 (voidpf)calloc(items, size);
303 }
304
zcfree(voidpf opaque,voidpf ptr)305 void zcfree (voidpf opaque, voidpf ptr)
306 {
307 free(ptr);
308 if (opaque) return; /* make compiler happy */
309 }
310
311 #endif /* MY_ZCALLOC */
312