0,0 → 1,324 |
/* zutil.c -- target dependent utility functions for the compression library |
* Copyright (C) 1995-2005, 2010, 2011, 2012 Jean-loup Gailly. |
* For conditions of distribution and use, see copyright notice in zlib.h |
*/ |
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/* @(#) $Id$ */ |
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#include "zutil.h" |
#ifndef Z_SOLO |
# include "gzguts.h" |
#endif |
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#ifndef NO_DUMMY_DECL |
struct internal_state {int dummy;}; /* for buggy compilers */ |
#endif |
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z_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) */ |
""}; |
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const char * ZEXPORT zlibVersion() |
{ |
return ZLIB_VERSION; |
} |
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uLong ZEXPORT zlibCompileFlags() |
{ |
uLong flags; |
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flags = 0; |
switch ((int)(sizeof(uInt))) { |
case 2: break; |
case 4: flags += 1; break; |
case 8: flags += 2; break; |
default: flags += 3; |
} |
switch ((int)(sizeof(uLong))) { |
case 2: break; |
case 4: flags += 1 << 2; break; |
case 8: flags += 2 << 2; break; |
default: flags += 3 << 2; |
} |
switch ((int)(sizeof(voidpf))) { |
case 2: break; |
case 4: flags += 1 << 4; break; |
case 8: flags += 2 << 4; break; |
default: flags += 3 << 4; |
} |
switch ((int)(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 |
#if defined(STDC) || defined(Z_HAVE_STDARG_H) |
# 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; |
} |
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#ifdef DEBUG |
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# ifndef verbose |
# define verbose 0 |
# endif |
int ZLIB_INTERNAL z_verbose = verbose; |
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void ZLIB_INTERNAL z_error (m) |
char *m; |
{ |
fprintf(stderr, "%s\n", m); |
exit(1); |
} |
#endif |
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/* exported to allow conversion of error code to string for compress() and |
* uncompress() |
*/ |
const char * ZEXPORT zError(err) |
int err; |
{ |
return ERR_MSG(err); |
} |
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#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 |
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#ifndef HAVE_MEMCPY |
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void ZLIB_INTERNAL zmemcpy(dest, source, len) |
Bytef* dest; |
const Bytef* source; |
uInt len; |
{ |
if (len == 0) return; |
do { |
*dest++ = *source++; /* ??? to be unrolled */ |
} while (--len != 0); |
} |
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int ZLIB_INTERNAL zmemcmp(s1, s2, len) |
const Bytef* s1; |
const Bytef* s2; |
uInt len; |
{ |
uInt j; |
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for (j = 0; j < len; j++) { |
if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; |
} |
return 0; |
} |
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void ZLIB_INTERNAL zmemzero(dest, len) |
Bytef* dest; |
uInt len; |
{ |
if (len == 0) return; |
do { |
*dest++ = 0; /* ??? to be unrolled */ |
} while (--len != 0); |
} |
#endif |
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#ifndef Z_SOLO |
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#ifdef SYS16BIT |
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#ifdef __TURBOC__ |
/* Turbo C in 16-bit mode */ |
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# define MY_ZCALLOC |
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/* 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(). |
*/ |
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#define MAX_PTR 10 |
/* 10*64K = 640K */ |
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local int next_ptr = 0; |
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typedef struct ptr_table_s { |
voidpf org_ptr; |
voidpf new_ptr; |
} ptr_table; |
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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. |
*/ |
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voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size) |
{ |
voidpf buf = opaque; /* just to make some compilers happy */ |
ulg bsize = (ulg)items*size; |
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/* 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; |
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/* 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; |
} |
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void ZLIB_INTERNAL 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; |
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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"); |
} |
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#endif /* __TURBOC__ */ |
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#ifdef M_I86 |
/* Microsoft C in 16-bit mode */ |
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# define MY_ZCALLOC |
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#if (!defined(_MSC_VER) || (_MSC_VER <= 600)) |
# define _halloc halloc |
# define _hfree hfree |
#endif |
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voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size) |
{ |
if (opaque) opaque = 0; /* to make compiler happy */ |
return _halloc((long)items, size); |
} |
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void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) |
{ |
if (opaque) opaque = 0; /* to make compiler happy */ |
_hfree(ptr); |
} |
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#endif /* M_I86 */ |
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#endif /* SYS16BIT */ |
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#ifndef MY_ZCALLOC /* Any system without a special alloc function */ |
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#ifndef STDC |
extern voidp malloc OF((uInt size)); |
extern voidp calloc OF((uInt items, uInt size)); |
extern void free OF((voidpf ptr)); |
#endif |
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voidpf ZLIB_INTERNAL 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); |
} |
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void ZLIB_INTERNAL zcfree (opaque, ptr) |
voidpf opaque; |
voidpf ptr; |
{ |
free(ptr); |
if (opaque) return; /* make compiler happy */ |
} |
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#endif /* MY_ZCALLOC */ |
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#endif /* !Z_SOLO */ |