1 /* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2005, 2010, 2011 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
zlibVersion()27 const char * ZEXPORT zlibVersion()
28 {
29 return ZLIB_VERSION;
30 }
31
zlibCompileFlags()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 Z_SOLO
89 return flags;
90 #else
91 return flags + gzflags();
92 #endif
93 }
94
95 #ifdef DEBUG
96
97 # ifndef verbose
98 # define verbose 0
99 # endif
100 int ZLIB_INTERNAL z_verbose = verbose;
101
z_error(m)102 void ZLIB_INTERNAL z_error (m)
103 char *m;
104 {
105 fprintf(stderr, "%s\n", m);
106 exit(1);
107 }
108 #endif
109
110 /* exported to allow conversion of error code to string for compress() and
111 * uncompress()
112 */
zError(err)113 const char * ZEXPORT zError(err)
114 int err;
115 {
116 return ERR_MSG(err);
117 }
118
119 #if defined(_WIN32_WCE)
120 /* The Microsoft C Run-Time Library for Windows CE doesn't have
121 * errno. We define it as a global variable to simplify porting.
122 * Its value is always 0 and should not be used.
123 */
124 int errno = 0;
125 #endif
126
127 #ifndef HAVE_MEMCPY
128
zmemcpy(dest,source,len)129 void ZLIB_INTERNAL zmemcpy(dest, source, len)
130 Bytef* dest;
131 const Bytef* source;
132 uInt len;
133 {
134 if (len == 0) return;
135 do {
136 *dest++ = *source++; /* ??? to be unrolled */
137 } while (--len != 0);
138 }
139
zmemcmp(s1,s2,len)140 int ZLIB_INTERNAL zmemcmp(s1, s2, len)
141 const Bytef* s1;
142 const Bytef* s2;
143 uInt len;
144 {
145 uInt j;
146
147 for (j = 0; j < len; j++) {
148 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
149 }
150 return 0;
151 }
152
zmemzero(dest,len)153 void ZLIB_INTERNAL zmemzero(dest, len)
154 Bytef* dest;
155 uInt len;
156 {
157 if (len == 0) return;
158 do {
159 *dest++ = 0; /* ??? to be unrolled */
160 } while (--len != 0);
161 }
162 #endif
163
164 #ifndef Z_SOLO
165
166 #ifdef SYS16BIT
167
168 #ifdef __TURBOC__
169 /* Turbo C in 16-bit mode */
170
171 # define MY_ZCALLOC
172
173 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
174 * and farmalloc(64K) returns a pointer with an offset of 8, so we
175 * must fix the pointer. Warning: the pointer must be put back to its
176 * original form in order to free it, use zcfree().
177 */
178
179 #define MAX_PTR 10
180 /* 10*64K = 640K */
181
182 local int next_ptr = 0;
183
184 typedef struct ptr_table_s {
185 voidpf org_ptr;
186 voidpf new_ptr;
187 } ptr_table;
188
189 local ptr_table table[MAX_PTR];
190 /* This table is used to remember the original form of pointers
191 * to large buffers (64K). Such pointers are normalized with a zero offset.
192 * Since MSDOS is not a preemptive multitasking OS, this table is not
193 * protected from concurrent access. This hack doesn't work anyway on
194 * a protected system like OS/2. Use Microsoft C instead.
195 */
196
zcalloc(voidpf opaque,unsigned items,unsigned size)197 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
198 {
199 voidpf buf = opaque; /* just to make some compilers happy */
200 ulg bsize = (ulg)items*size;
201
202 /* If we allocate less than 65520 bytes, we assume that farmalloc
203 * will return a usable pointer which doesn't have to be normalized.
204 */
205 if (bsize < 65520L) {
206 buf = farmalloc(bsize);
207 if (*(ush*)&buf != 0) return buf;
208 } else {
209 buf = farmalloc(bsize + 16L);
210 }
211 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
212 table[next_ptr].org_ptr = buf;
213
214 /* Normalize the pointer to seg:0 */
215 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
216 *(ush*)&buf = 0;
217 table[next_ptr++].new_ptr = buf;
218 return buf;
219 }
220
zcfree(voidpf opaque,voidpf ptr)221 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
222 {
223 int n;
224 if (*(ush*)&ptr != 0) { /* object < 64K */
225 farfree(ptr);
226 return;
227 }
228 /* Find the original pointer */
229 for (n = 0; n < next_ptr; n++) {
230 if (ptr != table[n].new_ptr) continue;
231
232 farfree(table[n].org_ptr);
233 while (++n < next_ptr) {
234 table[n-1] = table[n];
235 }
236 next_ptr--;
237 return;
238 }
239 ptr = opaque; /* just to make some compilers happy */
240 Assert(0, "zcfree: ptr not found");
241 }
242
243 #endif /* __TURBOC__ */
244
245
246 #ifdef M_I86
247 /* Microsoft C in 16-bit mode */
248
249 # define MY_ZCALLOC
250
251 #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
252 # define _halloc halloc
253 # define _hfree hfree
254 #endif
255
zcalloc(voidpf opaque,uInt items,uInt size)256 voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
257 {
258 if (opaque) opaque = 0; /* to make compiler happy */
259 return _halloc((long)items, size);
260 }
261
zcfree(voidpf opaque,voidpf ptr)262 void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
263 {
264 if (opaque) opaque = 0; /* to make compiler happy */
265 _hfree(ptr);
266 }
267
268 #endif /* M_I86 */
269
270 #endif /* SYS16BIT */
271
272
273 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
274
275 #ifndef STDC
276 extern voidp malloc OF((uInt size));
277 extern voidp calloc OF((uInt items, uInt size));
278 extern void free OF((voidpf ptr));
279 #endif
280
zcalloc(opaque,items,size)281 voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
282 voidpf opaque;
283 unsigned items;
284 unsigned size;
285 {
286 if (opaque) items += size - size; /* make compiler happy */
287 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
288 (voidpf)calloc(items, size);
289 }
290
zcfree(opaque,ptr)291 void ZLIB_INTERNAL zcfree (opaque, ptr)
292 voidpf opaque;
293 voidpf ptr;
294 {
295 free(ptr);
296 if (opaque) return; /* make compiler happy */
297 }
298
299 #endif /* MY_ZCALLOC */
300
301 #endif /* !Z_SOLO */
302