/* 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: zutil.c,v 1.1 2005/09/23 22:39:00 beng Exp $ */#include "zutil.h"#ifndef NO_DUMMY_DECLstruct internal_state      {int dummy;}; /* for buggy compilers */#endifconst 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#  endifint 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_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 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#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 /* M_I86 */#endif /* SYS16BIT */#ifndef MY_ZCALLOC /* Any system without a special alloc function */#ifndef STDCextern voidp  malloc OF((uInt size));extern voidp  calloc OF((uInt items, uInt size));extern void   free   OF((voidpf ptr));#endifvoidpf 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 */