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 (m)
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(err)
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    int errno = 0;
148#endif
149
150#ifndef HAVE_MEMCPY
151
152void ZLIB_INTERNAL zmemcpy(dest, source, len)
153    Bytef* dest;
154    const Bytef* source;
155    uInt  len;
156{
157    if (len == 0) return;
158    do {
159        *dest++ = *source++; /* ??? to be unrolled */
160    } while (--len != 0);
161}
162
163int ZLIB_INTERNAL zmemcmp(s1, s2, len)
164    const Bytef* s1;
165    const Bytef* s2;
166    uInt  len;
167{
168    uInt j;
169
170    for (j = 0; j < len; j++) {
171        if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
172    }
173    return 0;
174}
175
176void ZLIB_INTERNAL zmemzero(dest, len)
177    Bytef* dest;
178    uInt  len;
179{
180    if (len == 0) return;
181    do {
182        *dest++ = 0;  /* ??? to be unrolled */
183    } while (--len != 0);
184}
185#endif
186
187#ifndef Z_SOLO
188
189#ifdef SYS16BIT
190
191#ifdef __TURBOC__
192/* Turbo C in 16-bit mode */
193
194#  define MY_ZCALLOC
195
196/* Turbo C malloc() does not allow dynamic allocation of 64K bytes
197 * and farmalloc(64K) returns a pointer with an offset of 8, so we
198 * must fix the pointer. Warning: the pointer must be put back to its
199 * original form in order to free it, use zcfree().
200 */
201
202#define MAX_PTR 10
203/* 10*64K = 640K */
204
205local int next_ptr = 0;
206
207typedef struct ptr_table_s {
208    voidpf org_ptr;
209    voidpf new_ptr;
210} ptr_table;
211
212local ptr_table table[MAX_PTR];
213/* This table is used to remember the original form of pointers
214 * to large buffers (64K). Such pointers are normalized with a zero offset.
215 * Since MSDOS is not a preemptive multitasking OS, this table is not
216 * protected from concurrent access. This hack doesn't work anyway on
217 * a protected system like OS/2. Use Microsoft C instead.
218 */
219
220voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
221{
222    voidpf buf = opaque; /* just to make some compilers happy */
223    ulg bsize = (ulg)items*size;
224
225    /* If we allocate less than 65520 bytes, we assume that farmalloc
226     * will return a usable pointer which doesn't have to be normalized.
227     */
228    if (bsize < 65520L) {
229        buf = farmalloc(bsize);
230        if (*(ush*)&buf != 0) return buf;
231    } else {
232        buf = farmalloc(bsize + 16L);
233    }
234    if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
235    table[next_ptr].org_ptr = buf;
236
237    /* Normalize the pointer to seg:0 */
238    *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
239    *(ush*)&buf = 0;
240    table[next_ptr++].new_ptr = buf;
241    return buf;
242}
243
244void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
245{
246    int n;
247    if (*(ush*)&ptr != 0) { /* object < 64K */
248        farfree(ptr);
249        return;
250    }
251    /* Find the original pointer */
252    for (n = 0; n < next_ptr; n++) {
253        if (ptr != table[n].new_ptr) continue;
254
255        farfree(table[n].org_ptr);
256        while (++n < next_ptr) {
257            table[n-1] = table[n];
258        }
259        next_ptr--;
260        return;
261    }
262    ptr = opaque; /* just to make some compilers happy */
263    Assert(0, "zcfree: ptr not found");
264}
265
266#endif /* __TURBOC__ */
267
268
269#ifdef M_I86
270/* Microsoft C in 16-bit mode */
271
272#  define MY_ZCALLOC
273
274#if (!defined(_MSC_VER) || (_MSC_VER <= 600))
275#  define _halloc  halloc
276#  define _hfree   hfree
277#endif
278
279voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
280{
281    if (opaque) opaque = 0; /* to make compiler happy */
282    return _halloc((long)items, size);
283}
284
285void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
286{
287    if (opaque) opaque = 0; /* to make compiler happy */
288    _hfree(ptr);
289}
290
291#endif /* M_I86 */
292
293#endif /* SYS16BIT */
294
295
296#ifndef MY_ZCALLOC /* Any system without a special alloc function */
297
298#ifndef STDC
299extern voidp  malloc OF((uInt size));
300extern voidp  calloc OF((uInt items, uInt size));
301extern void   free   OF((voidpf ptr));
302#endif
303
304voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
305    voidpf opaque;
306    unsigned items;
307    unsigned size;
308{
309    if (opaque) items += size - size; /* make compiler happy */
310    return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
311                              (voidpf)calloc(items, size);
312}
313
314void ZLIB_INTERNAL zcfree (opaque, ptr)
315    voidpf opaque;
316    voidpf ptr;
317{
318    free(ptr);
319    if (opaque) return; /* make compiler happy */
320}
321
322#endif /* MY_ZCALLOC */
323
324#endif /* !Z_SOLO */
325