/* zutil.c -- target dependent utility functions for the compression library | |
* Copyright (C) 1995-2005 Jean-loup Gailly. | |
* For conditions of distribution and use, see copyright notice in zlib.h | |
*/ | |
/* @(#) $Id$ */ | |
#include "zutil.h" | |
#ifndef NO_DUMMY_DECL | |
struct internal_state {int dummy;}; /* for buggy compilers */ | |
#endif | |
const char * const 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; | |
} | |
uLong ZEXPORT zlibCompileFlags() | |
{ | |
uLong flags; | |
flags = 0; | |
switch (sizeof(uInt)) { | |
case 2: break; | |
case 4: flags += 1; break; | |
case 8: flags += 2; break; | |
default: flags += 3; | |
} | |
switch (sizeof(uLong)) { | |
case 2: break; | |
case 4: flags += 1 << 2; break; | |
case 8: flags += 2 << 2; break; | |
default: flags += 3 << 2; | |
} | |
switch (sizeof(voidpf)) { | |
case 2: break; | |
case 4: flags += 1 << 4; break; | |
case 8: flags += 2 << 4; break; | |
default: flags += 3 << 4; | |
} | |
switch (sizeof(z_off_t)) { | |
case 2: break; | |
case 4: flags += 1 << 6; break; | |
case 8: flags += 2 << 6; break; | |
default: flags += 3 << 6; | |
} | |
#ifdef DEBUG | |
flags += 1 << 8; | |
#endif | |
#if defined(ASMV) || defined(ASMINF) | |
flags += 1 << 9; | |
#endif | |
#ifdef ZLIB_WINAPI | |
flags += 1 << 10; | |
#endif | |
#ifdef BUILDFIXED | |
flags += 1 << 12; | |
#endif | |
#ifdef DYNAMIC_CRC_TABLE | |
flags += 1 << 13; | |
#endif | |
#ifdef NO_GZCOMPRESS | |
flags += 1L << 16; | |
#endif | |
#ifdef NO_GZIP | |
flags += 1L << 17; | |
#endif | |
#ifdef PKZIP_BUG_WORKAROUND | |
flags += 1L << 20; | |
#endif | |
#ifdef FASTEST | |
flags += 1L << 21; | |
#endif | |
#ifdef STDC | |
# ifdef NO_vsnprintf | |
flags += 1L << 25; | |
# ifdef HAS_vsprintf_void | |
flags += 1L << 26; | |
# endif | |
# else | |
# ifdef HAS_vsnprintf_void | |
flags += 1L << 26; | |
# endif | |
# endif | |
#else | |
flags += 1L << 24; | |
# ifdef NO_snprintf | |
flags += 1L << 25; | |
# ifdef HAS_sprintf_void | |
flags += 1L << 26; | |
# endif | |
# else | |
# ifdef HAS_snprintf_void | |
flags += 1L << 26; | |
# endif | |
# endif | |
#endif | |
return flags; | |
} | |
#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); | |
} | |
#if defined(_WIN32_WCE) | |
/* The Microsoft C Run-Time Library for Windows CE doesn't have | |
* errno. We define it as a global variable to simplify porting. | |
* Its value is always 0 and should not be used. | |
*/ | |
int errno = 0; | |
#endif | |
#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 SYS16BIT | |
#ifdef __TURBOC__ | |
/* Turbo C in 16-bit mode */ | |
# 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 /* __TURBOC__ */ | |
#ifdef M_I86 | |
/* 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 /* M_I86 */ | |
#endif /* SYS16BIT */ | |
#ifndef MY_ZCALLOC /* Any system without a special alloc function */ | |
#ifndef STDC | |
extern voidp malloc OF((uInt size)); | |
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 sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : | |
(voidpf)calloc(items, size); | |
} | |
void zcfree (opaque, ptr) | |
voidpf opaque; | |
voidpf ptr; | |
{ | |
free(ptr); | |
if (opaque) return; /* make compiler happy */ | |
} | |
#endif /* MY_ZCALLOC */ |