A massively spiffy yet delicately unobtrusive compression library. (grpc依赖)
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/* zutil.c -- target dependent utility functions for the compression library
* Copyright (C) 1995 Jean-loup Gailly.
* For conditions of distribution and use, see copyright notice in zlib.h
*/
/* $Id: zutil.c,v 1.6 1995/04/29 14:54:02 jloup Exp $ */
#include <stdio.h>
#include "zutil.h"
extern void exit __P((int));
char *zlib_version = ZLIB_VERSION;
char *z_errmsg[] = {
"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) */
""};
void z_error (m)
char *m;
{
fprintf(stderr, "%s\n", m);
exit(1);
}
#ifndef HAVE_MEMCPY
void zmemcpy(dest, source, len)
Byte* dest;
Byte* source;
uInt len;
{
if (len == 0) return;
do {
*dest++ = *source++; /* ??? to be unrolled */
} while (--len != 0);
}
void zmemzero(dest, len)
Byte* dest;
uInt len;
{
if (len == 0) return;
do {
*dest++ = 0; /* ??? to be unrolled */
} while (--len != 0);
}
#endif
#if defined(MSDOS) && !defined(__SMALL__) && !defined(M_I86SM)
# ifdef __TURBOC__
/* 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 {
voidp org_ptr;
voidp 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.
*/
voidp zcalloc (voidp opaque, unsigned items, unsigned size)
{
voidp buf = opaque; /* just to make some compilers happy */
ulg bsize = (ulg)items*size;
if (bsize < 65536L) {
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 (voidp opaque, voidp 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 */
z_error("zcfree: ptr not found");
}
# else /* MSC */
#if (!defined(_MSC_VER) || (_MSC_VER < 600))
# define _halloc halloc
# define _hfree hfree
#endif
voidp zcalloc (voidp opaque, unsigned items, unsigned size)
{
if (opaque) opaque = 0; /* to make compiler happy */
return _halloc((long)items, size);
}
void zcfree (voidp opaque, voidp ptr)
{
if (opaque) opaque = 0; /* to make compiler happy */
_hfree(ptr);
}
# endif /* __TURBOC__ ? */
#else /* !MSDOS */
extern voidp calloc __P((uInt items, uInt size));
extern void free __P((voidp ptr));
voidp zcalloc (opaque, items, size)
voidp opaque;
unsigned items;
unsigned size;
{
return calloc(items, size);
}
void zcfree (opaque, ptr)
voidp opaque;
voidp ptr;
{
free(ptr);
}
#endif /* MSDOS */