/* 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 */