1/* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2017 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#ifndef Z_SOLO
10# include "gzguts.h"
11#endif
12
13z_const char * const z_errmsg[10] = {
14 (z_const char *)"need dictionary", /* Z_NEED_DICT 2 */
15 (z_const char *)"stream end", /* Z_STREAM_END 1 */
16 (z_const char *)"", /* Z_OK 0 */
17 (z_const char *)"file error", /* Z_ERRNO (-1) */
18 (z_const char *)"stream error", /* Z_STREAM_ERROR (-2) */
19 (z_const char *)"data error", /* Z_DATA_ERROR (-3) */
20 (z_const char *)"insufficient memory", /* Z_MEM_ERROR (-4) */
21 (z_const char *)"buffer error", /* Z_BUF_ERROR (-5) */
22 (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */
23 (z_const char *)""
24};
25
26
27const char * ZEXPORT zlibVersion(void) {
28 return ZLIB_VERSION;
29}
30
31uLong ZEXPORT zlibCompileFlags(void) {
32 uLong flags;
33
34 flags = 0;
35 switch ((int)(sizeof(uInt))) {
36 case 2: break;
37 case 4: flags += 1; break;
38 case 8: flags += 2; break;
39 default: flags += 3;
40 }
41 switch ((int)(sizeof(uLong))) {
42 case 2: break;
43 case 4: flags += 1 << 2; break;
44 case 8: flags += 2 << 2; break;
45 default: flags += 3 << 2;
46 }
47 switch ((int)(sizeof(voidpf))) {
48 case 2: break;
49 case 4: flags += 1 << 4; break;
50 case 8: flags += 2 << 4; break;
51 default: flags += 3 << 4;
52 }
53 switch ((int)(sizeof(z_off_t))) {
54 case 2: break;
55 case 4: flags += 1 << 6; break;
56 case 8: flags += 2 << 6; break;
57 default: flags += 3 << 6;
58 }
59#ifdef ZLIB_DEBUG
60 flags += 1 << 8;
61#endif
62 /*
63#if defined(ASMV) || defined(ASMINF)
64 flags += 1 << 9;
65#endif
66 */
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#if defined(STDC) || defined(Z_HAVE_STDARG_H)
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#include <stdlib.h>
117# ifndef verbose
118# define verbose 0
119# endif
120int ZLIB_INTERNAL z_verbose = verbose;
121
122void ZLIB_INTERNAL z_error(char *m) {
123 fprintf(stderr, "%s\n", m);
124 exit(1);
125}
126#endif
127
128/* exported to allow conversion of error code to string for compress() and
129 * uncompress()
130 */
131const char * ZEXPORT zError(int err) {
132 return ERR_MSG(err);
133}
134
135#if defined(_WIN32_WCE) && _WIN32_WCE < 0x800
136 /* The older Microsoft C Run-Time Library for Windows CE doesn't have
137 * errno. We define it as a global variable to simplify porting.
138 * Its value is always 0 and should not be used.
139 */
140 int errno = 0;
141#endif
142
143#ifndef HAVE_MEMCPY
144
145void ZLIB_INTERNAL zmemcpy(Bytef* dest, const Bytef* source, uInt len) {
146 if (len == 0) return;
147 do {
148 *dest++ = *source++; /* ??? to be unrolled */
149 } while (--len != 0);
150}
151
152int ZLIB_INTERNAL zmemcmp(const Bytef* s1, const Bytef* s2, uInt len) {
153 uInt j;
154
155 for (j = 0; j < len; j++) {
156 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
157 }
158 return 0;
159}
160
161void ZLIB_INTERNAL zmemzero(Bytef* dest, uInt len) {
162 if (len == 0) return;
163 do {
164 *dest++ = 0; /* ??? to be unrolled */
165 } while (--len != 0);
166}
167#endif
168
169#ifndef Z_SOLO
170
171#ifdef SYS16BIT
172
173#ifdef __TURBOC__
174/* Turbo C in 16-bit mode */
175
176# define MY_ZCALLOC
177
178/* Turbo C malloc() does not allow dynamic allocation of 64K bytes
179 * and farmalloc(64K) returns a pointer with an offset of 8, so we
180 * must fix the pointer. Warning: the pointer must be put back to its
181 * original form in order to free it, use zcfree().
182 */
183
184#define MAX_PTR 10
185/* 10*64K = 640K */
186
187local int next_ptr = 0;
188
189typedef struct ptr_table_s {
190 voidpf org_ptr;
191 voidpf new_ptr;
192} ptr_table;
193
194local ptr_table table[MAX_PTR];
195/* This table is used to remember the original form of pointers
196 * to large buffers (64K). Such pointers are normalized with a zero offset.
197 * Since MSDOS is not a preemptive multitasking OS, this table is not
198 * protected from concurrent access. This hack doesn't work anyway on
199 * a protected system like OS/2. Use Microsoft C instead.
200 */
201
202voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) {
203 voidpf buf;
204 ulg bsize = (ulg)items*size;
205
206 (void)opaque;
207
208 /* If we allocate less than 65520 bytes, we assume that farmalloc
209 * will return a usable pointer which doesn't have to be normalized.
210 */
211 if (bsize < 65520L) {
212 buf = farmalloc(bsize);
213 if (*(ush*)&buf != 0) return buf;
214 } else {
215 buf = farmalloc(bsize + 16L);
216 }
217 if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
218 table[next_ptr].org_ptr = buf;
219
220 /* Normalize the pointer to seg:0 */
221 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
222 *(ush*)&buf = 0;
223 table[next_ptr++].new_ptr = buf;
224 return buf;
225}
226
227void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
228 int n;
229
230 (void)opaque;
231
232 if (*(ush*)&ptr != 0) { /* object < 64K */
233 farfree(ptr);
234 return;
235 }
236 /* Find the original pointer */
237 for (n = 0; n < next_ptr; n++) {
238 if (ptr != table[n].new_ptr) continue;
239
240 farfree(table[n].org_ptr);
241 while (++n < next_ptr) {
242 table[n-1] = table[n];
243 }
244 next_ptr--;
245 return;
246 }
247 Assert(0, "zcfree: ptr not found");
248}
249
250#endif /* __TURBOC__ */
251
252
253#ifdef M_I86
254/* Microsoft C in 16-bit mode */
255
256# define MY_ZCALLOC
257
258#if (!defined(_MSC_VER) || (_MSC_VER <= 600))
259# define _halloc halloc
260# define _hfree hfree
261#endif
262
263voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, uInt items, uInt size) {
264 (void)opaque;
265 return _halloc((long)items, size);
266}
267
268void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
269 (void)opaque;
270 _hfree(ptr);
271}
272
273#endif /* M_I86 */
274
275#endif /* SYS16BIT */
276
277
278#ifndef MY_ZCALLOC /* Any system without a special alloc function */
279
280#ifndef STDC
281extern voidp malloc(uInt size);
282extern voidp calloc(uInt items, uInt size);
283extern void free(voidpf ptr);
284#endif
285
286voidpf ZLIB_INTERNAL zcalloc(voidpf opaque, unsigned items, unsigned size) {
287 (void)opaque;
288 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
289 (voidpf)calloc(items, size);
290}
291
292void ZLIB_INTERNAL zcfree(voidpf opaque, voidpf ptr) {
293 (void)opaque;
294 free(ptr);
295}
296
297#endif /* MY_ZCALLOC */
298
299#endif /* !Z_SOLO */
300