Src/zlib-1.1.3/zutil.c

/* zutil.c -- target dependent utility functions for the compression library
 * Copyright (C) 1995-1998 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */

/* @(#) $Id: zutil.c,v 1.1 2001/10/31 08:19:54 rabbi Exp $ */

#include "zutil.h"

struct internal_state      {int dummy;}; /* for buggy compilers */

#ifndef STDC
extern void exit OF((int));
#endif

const char *z_errmsg[10] = {
"need dictionary",     /* Z_NEED_DICT       2  */
"stream end",          /* Z_STREAM_END      1  */
"",                    /* Z_OK              0  */
"file error",          /* Z_ERRNO         (-1) */
"stream error",        /* Z_STREAM_ERROR  (-2) */
"data error",          /* Z_DATA_ERROR    (-3) */
"insufficient memory", /* Z_MEM_ERROR     (-4) */
"buffer error",        /* Z_BUF_ERROR     (-5) */
"incompatible version",/* Z_VERSION_ERROR (-6) */
""};


const char * ZEXPORT zlibVersion()
{
    return ZLIB_VERSION;
}

#ifdef DEBUG

#  ifndef verbose
#    define verbose 0
#  endif
int z_verbose = verbose;

void z_error (m)
    char *m;
{
    fprintf(stderr, "%s\n", m);
    exit(1);
}
#endif

/* exported to allow conversion of error code to string for compress() and
 * uncompress()
 */
const char * ZEXPORT zError(err)
    int err;
{
    return ERR_MSG(err);
}


#ifndef HAVE_MEMCPY

void zmemcpy(dest, source, len)
    Bytef* dest;
    const Bytef* source;
    uInt  len;
{
    if (len == 0) return;
    do {
        *dest++ = *source++; /* ??? to be unrolled */
    } while (--len != 0);
}

int zmemcmp(s1, s2, len)
    const Bytef* s1;
    const Bytef* s2;
    uInt  len;
{
    uInt j;

    for (j = 0; j < len; j++) {
        if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
    }
    return 0;
}

void zmemzero(dest, len)
    Bytef* dest;
    uInt  len;
{
    if (len == 0) return;
    do {
        *dest++ = 0;  /* ??? to be unrolled */
    } while (--len != 0);
}
#endif

#ifdef __TURBOC__
#if (defined( __BORLANDC__) || !defined(SMALL_MEDIUM)) && !defined(__32BIT__)
/* Small and medium model in Turbo C are for now limited to near allocation
 * with reduced MAX_WBITS and MAX_MEM_LEVEL
 */
#  define MY_ZCALLOC

/* Turbo C malloc() does not allow dynamic allocation of 64K bytes
 * and farmalloc(64K) returns a pointer with an offset of 8, so we
 * must fix the pointer. Warning: the pointer must be put back to its
 * original form in order to free it, use zcfree().
 */

#define MAX_PTR 10
/* 10*64K = 640K */

local int next_ptr = 0;

typedef struct ptr_table_s {
    voidpf org_ptr;
    voidpf new_ptr;
} ptr_table;

local ptr_table table[MAX_PTR];
/* This table is used to remember the original form of pointers
 * to large buffers (64K). Such pointers are normalized with a zero offset.
 * Since MSDOS is not a preemptive multitasking OS, this table is not
 * protected from concurrent access. This hack doesn't work anyway on
 * a protected system like OS/2. Use Microsoft C instead.
 */

voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
{
    voidpf buf = opaque; /* just to make some compilers happy */
    ulg bsize = (ulg)items*size;

    /* If we allocate less than 65520 bytes, we assume that farmalloc
     * will return a usable pointer which doesn't have to be normalized.
     */
    if (bsize < 65520L) {
        buf = farmalloc(bsize);
        if (*(ush*)&buf != 0) return buf;
    } else {
        buf = farmalloc(bsize + 16L);
    }
    if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
    table[next_ptr].org_ptr = buf;

    /* Normalize the pointer to seg:0 */
    *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
    *(ush*)&buf = 0;
    table[next_ptr++].new_ptr = buf;
    return buf;
}

void  zcfree (voidpf opaque, voidpf ptr)
{
    int n;
    if (*(ush*)&ptr != 0) { /* object < 64K */
        farfree(ptr);
        return;
    }
    /* Find the original pointer */
    for (n = 0; n < next_ptr; n++) {
        if (ptr != table[n].new_ptr) continue;

        farfree(table[n].org_ptr);
        while (++n < next_ptr) {
            table[n-1] = table[n];
        }
        next_ptr--;
        return;
    }
    ptr = opaque; /* just to make some compilers happy */
    Assert(0, "zcfree: ptr not found");
}
#endif
#endif /* __TURBOC__ */


#if defined(M_I86) && !defined(__32BIT__)
/* Microsoft C in 16-bit mode */

#  define MY_ZCALLOC

#if (!defined(_MSC_VER) || (_MSC_VER <= 600))
#  define _halloc  halloc
#  define _hfree   hfree
#endif

voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
{
    if (opaque) opaque = 0; /* to make compiler happy */
    return _halloc((long)items, size);
}

void  zcfree (voidpf opaque, voidpf ptr)
{
    if (opaque) opaque = 0; /* to make compiler happy */
    _hfree(ptr);
}

#endif /* MSC */


#ifndef MY_ZCALLOC /* Any system without a special alloc function */

#ifndef STDC
extern voidp  calloc OF((uInt items, uInt size));
extern void   free   OF((voidpf ptr));
#endif

voidpf zcalloc (opaque, items, size)
    voidpf opaque;
    unsigned items;
    unsigned size;
{
    if (opaque) items += size - size; /* make compiler happy */
    return (voidpf)calloc(items, size);
}

void  zcfree (opaque, ptr)
    voidpf opaque;
    voidpf ptr;
{
    free(ptr);
    if (opaque) return; /* make compiler happy */
}

#endif /* MY_ZCALLOC */
1	rabbi	1	/* zutil.c -- target dependent utility functions for the compression library
2			* Copyright (C) 1995-1998 Jean-loup Gailly.
3			* For conditions of distribution and use, see copyright notice in zlib.h
4			*/
5
6			/* @(#) $Id: zutil.c,v 1.1 2001/10/31 08:19:54 rabbi Exp $ */
7
8			#include "zutil.h"
9
10			struct internal_state {int dummy;}; /* for buggy compilers */
11
12			#ifndef STDC
13			extern void exit OF((int));
14			#endif
15
16			const char *z_errmsg[10] = {
17			"need dictionary", /* Z_NEED_DICT 2 */
18			"stream end", /* Z_STREAM_END 1 */
19			"", /* Z_OK 0 */
20			"file error", /* Z_ERRNO (-1) */
21			"stream error", /* Z_STREAM_ERROR (-2) */
22			"data error", /* Z_DATA_ERROR (-3) */
23			"insufficient memory", /* Z_MEM_ERROR (-4) */
24			"buffer error", /* Z_BUF_ERROR (-5) */
25			"incompatible version",/* Z_VERSION_ERROR (-6) */
26			""};
27
28
29			const char * ZEXPORT zlibVersion()
30			{
31			return ZLIB_VERSION;
32			}
33
34			#ifdef DEBUG
35
36			# ifndef verbose
37			# define verbose 0
38			# endif
39			int z_verbose = verbose;
40
41			void z_error (m)
42			char *m;
43			{
44			fprintf(stderr, "%s\n", m);
45			exit(1);
46			}
47			#endif
48
49			/* exported to allow conversion of error code to string for compress() and
50			* uncompress()
51			*/
52			const char * ZEXPORT zError(err)
53			int err;
54			{
55			return ERR_MSG(err);
56			}
57
58
59			#ifndef HAVE_MEMCPY
60
61			void zmemcpy(dest, source, len)
62			Bytef* dest;
63			const Bytef* source;
64			uInt len;
65			{
66			if (len == 0) return;
67			do {
68			dest++ = source++; /* ??? to be unrolled */
69			} while (--len != 0);
70			}
71
72			int zmemcmp(s1, s2, len)
73			const Bytef* s1;
74			const Bytef* s2;
75			uInt len;
76			{
77			uInt j;
78
79			for (j = 0; j < len; j++) {
80			if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
81			}
82			return 0;
83			}
84
85			void zmemzero(dest, len)
86			Bytef* dest;
87			uInt len;
88			{
89			if (len == 0) return;
90			do {
91			dest++ = 0; / ??? to be unrolled */
92			} while (--len != 0);
93			}
94			#endif
95
96			#ifdef __TURBOC__
97			#if (defined( __BORLANDC__) \|\| !defined(SMALL_MEDIUM)) && !defined(__32BIT__)
98			/* Small and medium model in Turbo C are for now limited to near allocation
99			* with reduced MAX_WBITS and MAX_MEM_LEVEL
100			*/
101			# define MY_ZCALLOC
102
103			/* Turbo C malloc() does not allow dynamic allocation of 64K bytes
104			* and farmalloc(64K) returns a pointer with an offset of 8, so we
105			* must fix the pointer. Warning: the pointer must be put back to its
106			* original form in order to free it, use zcfree().
107			*/
108
109			#define MAX_PTR 10
110			/* 1064K = 640K /
111
112			local int next_ptr = 0;
113
114			typedef struct ptr_table_s {
115			voidpf org_ptr;
116			voidpf new_ptr;
117			} ptr_table;
118
119			local ptr_table table[MAX_PTR];
120			/* This table is used to remember the original form of pointers
121			* to large buffers (64K). Such pointers are normalized with a zero offset.
122			* Since MSDOS is not a preemptive multitasking OS, this table is not
123			* protected from concurrent access. This hack doesn't work anyway on
124			* a protected system like OS/2. Use Microsoft C instead.
125			*/
126
127			voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
128			{
129			voidpf buf = opaque; /* just to make some compilers happy */
130			ulg bsize = (ulg)items*size;
131
132			/* If we allocate less than 65520 bytes, we assume that farmalloc
133			* will return a usable pointer which doesn't have to be normalized.
134			*/
135			if (bsize < 65520L) {
136			buf = farmalloc(bsize);
137			if ((ush)&buf != 0) return buf;
138			} else {
139			buf = farmalloc(bsize + 16L);
140			}
141			if (buf == NULL \|\| next_ptr >= MAX_PTR) return NULL;
142			table[next_ptr].org_ptr = buf;
143
144			/* Normalize the pointer to seg:0 */
145			((ush)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
146			(ush)&buf = 0;
147			table[next_ptr++].new_ptr = buf;
148			return buf;
149			}
150
151			void zcfree (voidpf opaque, voidpf ptr)
152			{
153			int n;
154			if ((ush)&ptr != 0) { /* object < 64K */
155			farfree(ptr);
156			return;
157			}
158			/* Find the original pointer */
159			for (n = 0; n < next_ptr; n++) {
160			if (ptr != table[n].new_ptr) continue;
161
162			farfree(table[n].org_ptr);
163			while (++n < next_ptr) {
164			table[n-1] = table[n];
165			}
166			next_ptr--;
167			return;
168			}
169			ptr = opaque; /* just to make some compilers happy */
170			Assert(0, "zcfree: ptr not found");
171			}
172			#endif
173			#endif /* __TURBOC__ */
174
175
176			#if defined(M_I86) && !defined(__32BIT__)
177			/* Microsoft C in 16-bit mode */
178
179			# define MY_ZCALLOC
180
181			#if (!defined(_MSC_VER) \|\| (_MSC_VER <= 600))
182			# define _halloc halloc
183			# define _hfree hfree
184			#endif
185
186			voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
187			{
188			if (opaque) opaque = 0; /* to make compiler happy */
189			return _halloc((long)items, size);
190			}
191
192			void zcfree (voidpf opaque, voidpf ptr)
193			{
194			if (opaque) opaque = 0; /* to make compiler happy */
195			_hfree(ptr);
196			}
197
198			#endif /* MSC */
199
200
201			#ifndef MY_ZCALLOC /* Any system without a special alloc function */
202
203			#ifndef STDC
204			extern voidp calloc OF((uInt items, uInt size));
205			extern void free OF((voidpf ptr));
206			#endif
207
208			voidpf zcalloc (opaque, items, size)
209			voidpf opaque;
210			unsigned items;
211			unsigned size;
212			{
213			if (opaque) items += size - size; /* make compiler happy */
214			return (voidpf)calloc(items, size);
215			}
216
217			void zcfree (opaque, ptr)
218			voidpf opaque;
219			voidpf ptr;
220			{
221			free(ptr);
222			if (opaque) return; /* make compiler happy */
223			}
224
225			#endif /* MY_ZCALLOC */