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: //poco/Main/Foundation/src/zutil.c#8 $ */
7
8#include "zutil.h"
9
10#ifndef NO_DUMMY_DECL
11struct internal_state {int dummy;}; /* for buggy compilers */
12#endif
13
14const 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
27const char * ZEXPORT zlibVersion()
28{
29 return ZLIB_VERSION;
30}
31
32uLong 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 ZLIB_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 ZLIB_DEBUG
116
117# ifndef verbose
118# define verbose 0
119# endif
120int z_verbose = verbose;
121
122void 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 */
133const 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
149void 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
160int 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
173void 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
201local int next_ptr = 0;
202
203typedef struct ptr_table_s {
204 voidpf org_ptr;
205 voidpf new_ptr;
206} ptr_table;
207
208local 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
216voidpf 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
240void 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
275voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
276{
277 if (opaque) opaque = 0; /* to make compiler happy */
278 return _halloc((long)items, size);
279}
280
281void 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
295extern voidp malloc OF((uInt size));
296extern voidp calloc OF((uInt items, uInt size));
297extern void free OF((voidpf ptr));
298#endif
299
300voidpf 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
310void 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