/* zutil.c -- target dependent utility functions for the compression library * Copyright (C) 1995-2002 Jean-loup Gailly. * For conditions of distribution and use, see copyright notice in zlib.h *//* @(#) $Id: zutil.c,v 1.3 2006/04/29 07:31:16 wl Exp $ */#include "zutil.h"#ifndef STDCextern void exit OF((int));#endif#ifndef HAVE_MEMCPYvoid 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#endifvoidpf 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 STDCextern voidp  ft_scalloc OF((uInt items, uInt size));extern void   ft_sfree   OF((voidpf ptr));#endifvoidpf zcalloc (opaque, items, size)    voidpf opaque;    unsigned items;    unsigned size;{    if (opaque) items += size - size; /* make compiler happy */    return (voidpf)ft_scalloc(items, size);}void  zcfree (opaque, ptr)    voidpf opaque;    voidpf ptr;{    ft_sfree(ptr);    if (opaque) return; /* make compiler happy */}#endif /* MY_ZCALLOC */