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/modules/freetype2/src/gzip/zutil.c

http://github.com/zpao/v8monkey
C | 181 lines | 122 code | 33 blank | 26 comment | 35 complexity | 99b5f955f2ec8c9b90dac2a9311e9c0d MD5 | raw file
  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/* @(#) $Id$ */
  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#if defined( MSDOS ) && defined( __TURBOC__ ) && !defined( MY_ZCALLOC )
 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 /* MSDOS && __TURBOC__ */
130
131
132#if defined(M_I86) && !defined(__32BIT__) && !defined( MY_ZCALLOC )
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  ft_scalloc OF((uInt items, uInt size));
161extern void   ft_sfree   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)ft_scalloc(items, size);
171}
172
173void  zcfree (opaque, ptr)
174    voidpf opaque;
175    voidpf ptr;
176{
177    ft_sfree(ptr);
178    if (opaque) return; /* make compiler happy */
179}
180
181#endif /* MY_ZCALLOC */