source: trunk/poppler/freetype-2.1.10/src/gzip/zutil.c @ 2

Last change on this file since 2 was 2, checked in by Eugene Romanenko, 15 years ago

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1/* zutil.c -- target dependent utility functions for the compression library
2 * Copyright (C) 1995-2002 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6/* @(#) $Id: zutil.c,v 1.2 2002/11/06 22:32:54 davidT Exp $ */
7
8#include "zutil.h"
9
10#ifndef STDC
11extern void exit OF((int));
12#endif
13
14
15#ifndef HAVE_MEMCPY
16
17void zmemcpy(dest, source, len)
18    Bytef* dest;
19    const Bytef* source;
20    uInt  len;
21{
22    if (len == 0) return;
23    do {
24        *dest++ = *source++; /* ??? to be unrolled */
25    } while (--len != 0);
26}
27
28int zmemcmp(s1, s2, len)
29    const Bytef* s1;
30    const Bytef* s2;
31    uInt  len;
32{
33    uInt j;
34
35    for (j = 0; j < len; j++) {
36        if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
37    }
38    return 0;
39}
40
41void zmemzero(dest, len)
42    Bytef* dest;
43    uInt  len;
44{
45    if (len == 0) return;
46    do {
47        *dest++ = 0;  /* ??? to be unrolled */
48    } while (--len != 0);
49}
50#endif
51
52#ifdef __TURBOC__
53#if (defined( __BORLANDC__) || !defined(SMALL_MEDIUM)) && !defined(__32BIT__)
54/* Small and medium model in Turbo C are for now limited to near allocation
55 * with reduced MAX_WBITS and MAX_MEM_LEVEL
56 */
57#  define MY_ZCALLOC
58
59/* Turbo C malloc() does not allow dynamic allocation of 64K bytes
60 * and farmalloc(64K) returns a pointer with an offset of 8, so we
61 * must fix the pointer. Warning: the pointer must be put back to its
62 * original form in order to free it, use zcfree().
63 */
64
65#define MAX_PTR 10
66/* 10*64K = 640K */
67
68local int next_ptr = 0;
69
70typedef struct ptr_table_s {
71    voidpf org_ptr;
72    voidpf new_ptr;
73} ptr_table;
74
75local ptr_table table[MAX_PTR];
76/* This table is used to remember the original form of pointers
77 * to large buffers (64K). Such pointers are normalized with a zero offset.
78 * Since MSDOS is not a preemptive multitasking OS, this table is not
79 * protected from concurrent access. This hack doesn't work anyway on
80 * a protected system like OS/2. Use Microsoft C instead.
81 */
82
83voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
84{
85    voidpf buf = opaque; /* just to make some compilers happy */
86    ulg bsize = (ulg)items*size;
87
88    /* If we allocate less than 65520 bytes, we assume that farmalloc
89     * will return a usable pointer which doesn't have to be normalized.
90     */
91    if (bsize < 65520L) {
92        buf = farmalloc(bsize);
93        if (*(ush*)&buf != 0) return buf;
94    } else {
95        buf = farmalloc(bsize + 16L);
96    }
97    if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
98    table[next_ptr].org_ptr = buf;
99
100    /* Normalize the pointer to seg:0 */
101    *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
102    *(ush*)&buf = 0;
103    table[next_ptr++].new_ptr = buf;
104    return buf;
105}
106
107void  zcfree (voidpf opaque, voidpf ptr)
108{
109    int n;
110    if (*(ush*)&ptr != 0) { /* object < 64K */
111        farfree(ptr);
112        return;
113    }
114    /* Find the original pointer */
115    for (n = 0; n < next_ptr; n++) {
116        if (ptr != table[n].new_ptr) continue;
117
118        farfree(table[n].org_ptr);
119        while (++n < next_ptr) {
120            table[n-1] = table[n];
121        }
122        next_ptr--;
123        return;
124    }
125    ptr = opaque; /* just to make some compilers happy */
126    Assert(0, "zcfree: ptr not found");
127}
128#endif
129#endif /* __TURBOC__ */
130
131
132#if defined(M_I86) && !defined(__32BIT__)
133/* Microsoft C in 16-bit mode */
134
135#  define MY_ZCALLOC
136
137#if (!defined(_MSC_VER) || (_MSC_VER <= 600))
138#  define _halloc  halloc
139#  define _hfree   hfree
140#endif
141
142voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
143{
144    if (opaque) opaque = 0; /* to make compiler happy */
145    return _halloc((long)items, size);
146}
147
148void  zcfree (voidpf opaque, voidpf ptr)
149{
150    if (opaque) opaque = 0; /* to make compiler happy */
151    _hfree(ptr);
152}
153
154#endif /* MSC */
155
156
157#ifndef MY_ZCALLOC /* Any system without a special alloc function */
158
159#ifndef STDC
160extern voidp  calloc OF((uInt items, uInt size));
161extern void   free   OF((voidpf ptr));
162#endif
163
164voidpf zcalloc (opaque, items, size)
165    voidpf opaque;
166    unsigned items;
167    unsigned size;
168{
169    if (opaque) items += size - size; /* make compiler happy */
170    return (voidpf)calloc(items, size);
171}
172
173void  zcfree (opaque, ptr)
174    voidpf opaque;
175    voidpf ptr;
176{
177    free(ptr);
178    if (opaque) return; /* make compiler happy */
179}
180
181#endif /* MY_ZCALLOC */
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