zutil.c revision 4d3acf4ec42bf6e838f9060103aff98fbf170794 
1/* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2005, 2010, 2011, 2012 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
13#ifndef NO_DUMMY_DECL
14struct internal_state      {int dummy;}; /* for buggy compilers */
15#endif
16
17z_const char * const z_errmsg[10] = {
18"need dictionary",     /* Z_NEED_DICT       2  */
19"stream end",          /* Z_STREAM_END      1  */
20"",                    /* Z_OK              0  */
21"file error",          /* Z_ERRNO         (-1) */
22"stream error",        /* Z_STREAM_ERROR  (-2) */
23"data error",          /* Z_DATA_ERROR    (-3) */
24"insufficient memory", /* Z_MEM_ERROR     (-4) */
25"buffer error",        /* Z_BUF_ERROR     (-5) */
26"incompatible version",/* Z_VERSION_ERROR (-6) */
27""};
28
29
30const char * ZEXPORT zlibVersion()
31{
32    return ZLIB_VERSION;
33}
34
35uLong ZEXPORT zlibCompileFlags()
36{
37    uLong flags;
38
39    flags = 0;
40    switch ((int)(sizeof(uInt))) {
41    case 2:     break;
42    case 4:     flags += 1;     break;
43    case 8:     flags += 2;     break;
44    default:    flags += 3;
45    }
46    switch ((int)(sizeof(uLong))) {
47    case 2:     break;
48    case 4:     flags += 1 << 2;        break;
49    case 8:     flags += 2 << 2;        break;
50    default:    flags += 3 << 2;
51    }
52    switch ((int)(sizeof(voidpf))) {
53    case 2:     break;
54    case 4:     flags += 1 << 4;        break;
55    case 8:     flags += 2 << 4;        break;
56    default:    flags += 3 << 4;
57    }
58    switch ((int)(sizeof(z_off_t))) {
59    case 2:     break;
60    case 4:     flags += 1 << 6;        break;
61    case 8:     flags += 2 << 6;        break;
62    default:    flags += 3 << 6;
63    }
64#ifdef DEBUG
65    flags += 1 << 8;
66#endif
67#if defined(ASMV) || defined(ASMINF)
68    flags += 1 << 9;
69#endif
70#ifdef ZLIB_WINAPI
71    flags += 1 << 10;
72#endif
73#ifdef BUILDFIXED
74    flags += 1 << 12;
75#endif
76#ifdef DYNAMIC_CRC_TABLE
77    flags += 1 << 13;
78#endif
79#ifdef NO_GZCOMPRESS
80    flags += 1L << 16;
81#endif
82#ifdef NO_GZIP
83    flags += 1L << 17;
84#endif
85#ifdef PKZIP_BUG_WORKAROUND
86    flags += 1L << 20;
87#endif
88#ifdef FASTEST
89    flags += 1L << 21;
90#endif
91#if defined(STDC) || defined(Z_HAVE_STDARG_H)
92#  ifdef NO_vsnprintf
93    flags += 1L << 25;
94#    ifdef HAS_vsprintf_void
95    flags += 1L << 26;
96#    endif
97#  else
98#    ifdef HAS_vsnprintf_void
99    flags += 1L << 26;
100#    endif
101#  endif
102#else
103    flags += 1L << 24;
104#  ifdef NO_snprintf
105    flags += 1L << 25;
106#    ifdef HAS_sprintf_void
107    flags += 1L << 26;
108#    endif
109#  else
110#    ifdef HAS_snprintf_void
111    flags += 1L << 26;
112#    endif
113#  endif
114#endif
115    return flags;
116}
117
118#ifdef DEBUG
119
120#  ifndef verbose
121#    define verbose 0
122#  endif
123int ZLIB_INTERNAL z_verbose = verbose;
124
125void ZLIB_INTERNAL z_error (
126    char *m)
127{
128    fprintf(stderr, "%s\n", m);
129    exit(1);
130}
131#endif
132
133/* exported to allow conversion of error code to string for compress() and
134 * uncompress()
135 */
136const char * ZEXPORT zError(
137    int err)
138{
139    return ERR_MSG(err);
140}
141
142#if defined(_WIN32_WCE)
143    /* The Microsoft C Run-Time Library for Windows CE doesn't have
144     * errno.  We define it as a global variable to simplify porting.
145     * Its value is always 0 and should not be used.
146     */
147	/* does not exist on WCE. XYQ: and we don't need it! */
148    /*int errno = 0;*/
149#endif
150
151#ifndef HAVE_MEMCPY
152
153void ZLIB_INTERNAL zmemcpy(
154    Bytef* dest,
155    const Bytef* source,
156    uInt  len)
157{
158    if (len == 0) return;
159    do {
160        *dest++ = *source++; /* ??? to be unrolled */
161    } while (--len != 0);
162}
163
164int ZLIB_INTERNAL zmemcmp(
165    const Bytef* s1,
166    const Bytef* s2,
167    uInt  len)
168{
169    uInt j;
170
171    for (j = 0; j < len; j++) {
172        if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
173    }
174    return 0;
175}
176
177void ZLIB_INTERNAL zmemzero(
178    Bytef* dest,
179    uInt  len)
180{
181    if (len == 0) return;
182    do {
183        *dest++ = 0;  /* ??? to be unrolled */
184    } while (--len != 0);
185}
186#endif
187
188#if 0
189#ifndef Z_SOLO
190
191#ifdef SYS16BIT
192
193#ifdef __TURBOC__
194/* Turbo C in 16-bit mode */
195
196#  define MY_ZCALLOC
197
198/* Turbo C malloc() does not allow dynamic allocation of 64K bytes
199 * and farmalloc(64K) returns a pointer with an offset of 8, so we
200 * must fix the pointer. Warning: the pointer must be put back to its
201 * original form in order to free it, use zcfree().
202 */
203
204#define MAX_PTR 10
205/* 10*64K = 640K */
206
207local int next_ptr = 0;
208
209typedef struct ptr_table_s {
210    voidpf org_ptr;
211    voidpf new_ptr;
212} ptr_table;
213
214local ptr_table table[MAX_PTR];
215/* This table is used to remember the original form of pointers
216 * to large buffers (64K). Such pointers are normalized with a zero offset.
217 * Since MSDOS is not a preemptive multitasking OS, this table is not
218 * protected from concurrent access. This hack doesn't work anyway on
219 * a protected system like OS/2. Use Microsoft C instead.
220 */
221
222voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
223{
224    voidpf buf = opaque; /* just to make some compilers happy */
225    ulg bsize = (ulg)items*size;
226
227    /* If we allocate less than 65520 bytes, we assume that farmalloc
228     * will return a usable pointer which doesn't have to be normalized.
229     */
230    if (bsize < 65520L) {
231        buf = farmalloc(bsize);
232        if (*(ush*)&buf != 0) return buf;
233    } else {
234        buf = farmalloc(bsize + 16L);
235    }
236    if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
237    table[next_ptr].org_ptr = buf;
238
239    /* Normalize the pointer to seg:0 */
240    *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
241    *(ush*)&buf = 0;
242    table[next_ptr++].new_ptr = buf;
243    return buf;
244}
245
246void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
247{
248    int n;
249    if (*(ush*)&ptr != 0) { /* object < 64K */
250        farfree(ptr);
251        return;
252    }
253    /* Find the original pointer */
254    for (n = 0; n < next_ptr; n++) {
255        if (ptr != table[n].new_ptr) continue;
256
257        farfree(table[n].org_ptr);
258        while (++n < next_ptr) {
259            table[n-1] = table[n];
260        }
261        next_ptr--;
262        return;
263    }
264    ptr = opaque; /* just to make some compilers happy */
265    Assert(0, "zcfree: ptr not found");
266}
267
268#endif /* __TURBOC__ */
269
270
271#ifdef M_I86
272/* Microsoft C in 16-bit mode */
273
274#  define MY_ZCALLOC
275
276#if (!defined(_MSC_VER) || (_MSC_VER <= 600))
277#  define _halloc  halloc
278#  define _hfree   hfree
279#endif
280
281voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
282{
283    if (opaque) opaque = 0; /* to make compiler happy */
284    return _halloc((long)items, size);
285}
286
287void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
288{
289    if (opaque) opaque = 0; /* to make compiler happy */
290    _hfree(ptr);
291}
292
293#endif /* M_I86 */
294
295#endif /* SYS16BIT */
296
297
298#ifndef MY_ZCALLOC /* Any system without a special alloc function */
299
300#ifndef STDC
301extern voidp  malloc OF((uInt size));
302extern voidp  calloc OF((uInt items, uInt size));
303extern void   free   OF((voidpf ptr));
304#endif
305
306voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
307    voidpf opaque;
308    unsigned items;
309    unsigned size;
310{
311    if (opaque) items += size - size; /* make compiler happy */
312    return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
313                              (voidpf)calloc(items, size);
314}
315
316void ZLIB_INTERNAL zcfree (opaque, ptr)
317    voidpf opaque;
318    voidpf ptr;
319{
320    free(ptr);
321    if (opaque) return; /* make compiler happy */
322}
323
324#endif /* MY_ZCALLOC */
325
326#endif /* !Z_SOLO */
327#endif	/* 0 */
328
329extern void* FXMEM_DefaultAlloc(size_t, int);
330extern void FXMEM_DefaultFree(void*, int);
331
332/* XYQ 2007-1-19 */
333voidpf zcalloc(voidpf opaque, unsigned items, unsigned size)
334{
335	return FXMEM_DefaultAlloc(items * size, 0);
336}
337
338void zcfree(voidpf opaque, voidpf ptr)
339{
340	FXMEM_DefaultFree(ptr, 0);
341}
342