1/*
2 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
3 * Use is subject to license terms.
4 */
5
6/* zutil.c -- target dependent utility functions for the compression library
7 * Copyright (C) 1995-2005 Jean-loup Gailly.
8 * For conditions of distribution and use, see copyright notice in zlib.h
9 */
10
11#pragma ident	"%Z%%M%	%I%	%E% SMI"
12
13#include "zutil.h"
14
15#ifndef NO_DUMMY_DECL
16struct internal_state      {int dummy;}; /* for buggy compilers */
17#endif
18
19const char * const z_errmsg[10] = {
20"need dictionary",     /* Z_NEED_DICT       2  */
21"stream end",          /* Z_STREAM_END      1  */
22"",                    /* Z_OK              0  */
23"file error",          /* Z_ERRNO         (-1) */
24"stream error",        /* Z_STREAM_ERROR  (-2) */
25"data error",          /* Z_DATA_ERROR    (-3) */
26"insufficient memory", /* Z_MEM_ERROR     (-4) */
27"buffer error",        /* Z_BUF_ERROR     (-5) */
28"incompatible version",/* Z_VERSION_ERROR (-6) */
29""};
30
31
32const char * ZEXPORT zlibVersion()
33{
34    return ZLIB_VERSION;
35}
36
37uLong ZEXPORT zlibCompileFlags()
38{
39    uLong flags;
40
41    flags = 0;
42    switch (sizeof(uInt)) {
43    case 2:     break;
44    case 4:     flags += 1;     break;
45    case 8:     flags += 2;     break;
46    default:    flags += 3;
47    }
48    switch (sizeof(uLong)) {
49    case 2:     break;
50    case 4:     flags += 1 << 2;        break;
51    case 8:     flags += 2 << 2;        break;
52    default:    flags += 3 << 2;
53    }
54    switch (sizeof(voidpf)) {
55    case 2:     break;
56    case 4:     flags += 1 << 4;        break;
57    case 8:     flags += 2 << 4;        break;
58    default:    flags += 3 << 4;
59    }
60    switch (sizeof(z_off_t)) {
61    case 2:     break;
62    case 4:     flags += 1 << 6;        break;
63    case 8:     flags += 2 << 6;        break;
64    default:    flags += 3 << 6;
65    }
66#ifdef DEBUG
67    flags += 1 << 8;
68#endif
69#if defined(ASMV) || defined(ASMINF)
70    flags += 1 << 9;
71#endif
72#ifdef ZLIB_WINAPI
73    flags += 1 << 10;
74#endif
75#ifdef BUILDFIXED
76    flags += 1 << 12;
77#endif
78#ifdef DYNAMIC_CRC_TABLE
79    flags += 1 << 13;
80#endif
81#ifdef NO_GZCOMPRESS
82    flags += 1L << 16;
83#endif
84#ifdef NO_GZIP
85    flags += 1L << 17;
86#endif
87#ifdef PKZIP_BUG_WORKAROUND
88    flags += 1L << 20;
89#endif
90#ifdef FASTEST
91    flags += 1L << 21;
92#endif
93#ifdef STDC
94#  ifdef NO_vsnprintf
95        flags += 1L << 25;
96#    ifdef HAS_vsprintf_void
97        flags += 1L << 26;
98#    endif
99#  else
100#    ifdef HAS_vsnprintf_void
101        flags += 1L << 26;
102#    endif
103#  endif
104#else
105        flags += 1L << 24;
106#  ifdef NO_snprintf
107        flags += 1L << 25;
108#    ifdef HAS_sprintf_void
109        flags += 1L << 26;
110#    endif
111#  else
112#    ifdef HAS_snprintf_void
113        flags += 1L << 26;
114#    endif
115#  endif
116#endif
117    return flags;
118}
119
120#ifdef DEBUG
121
122#  ifndef verbose
123#    define verbose 0
124#  endif
125int z_verbose = verbose;
126
127void z_error (m)
128    char *m;
129{
130    fprintf(stderr, "%s\n", m);
131    exit(1);
132}
133#endif
134
135/* exported to allow conversion of error code to string for compress() and
136 * uncompress()
137 */
138const char * ZEXPORT zError(err)
139    int err;
140{
141    return ERR_MSG(err);
142}
143
144#if defined(_WIN32_WCE)
145    /* The Microsoft C Run-Time Library for Windows CE doesn't have
146     * errno.  We define it as a global variable to simplify porting.
147     * Its value is always 0 and should not be used.
148     */
149    int errno = 0;
150#endif
151
152#define	HAVE_MEMCPY
153#ifndef HAVE_MEMCPY
154
155void zmemcpy(dest, source, len)
156    Bytef* dest;
157    const Bytef* source;
158    uInt  len;
159{
160    if (len == 0) return;
161    do {
162        *dest++ = *source++; /* ??? to be unrolled */
163    } while (--len != 0);
164}
165
166int zmemcmp(s1, s2, len)
167    const Bytef* s1;
168    const Bytef* s2;
169    uInt  len;
170{
171    uInt j;
172
173    for (j = 0; j < len; j++) {
174        if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
175    }
176    return 0;
177}
178
179void zmemzero(dest, len)
180    Bytef* dest;
181    uInt  len;
182{
183    if (len == 0) return;
184    do {
185        *dest++ = 0;  /* ??? to be unrolled */
186    } while (--len != 0);
187}
188#endif
189
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 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  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 zcalloc (voidpf opaque, unsigned items, unsigned size)
282{
283    if (opaque) opaque = 0; /* to make compiler happy */
284    return _halloc((long)items, size);
285}
286
287void  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 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  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