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/* zutil.c -- target dependent utility functions for the compression library |
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* Copyright (C) 1995-2005, 2010, 2011, 2012 Jean-loup Gailly. |
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* For conditions of distribution and use, see copyright notice in zlib.h |
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*/ |
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|
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/* @(#) $Id$ */ |
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|
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#include "zutil.h" |
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#ifndef Z_SOLO |
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# include "gzguts.h" |
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#endif |
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|
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#ifndef NO_DUMMY_DECL |
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struct internal_state {int dummy;}; /* for buggy compilers */ |
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#endif |
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|
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z_const char * const z_errmsg[10] = { |
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"need dictionary", /* Z_NEED_DICT 2 */ |
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"stream end", /* Z_STREAM_END 1 */ |
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"", /* Z_OK 0 */ |
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"file error", /* Z_ERRNO (-1) */ |
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"stream error", /* Z_STREAM_ERROR (-2) */ |
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"data error", /* Z_DATA_ERROR (-3) */ |
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"insufficient memory", /* Z_MEM_ERROR (-4) */ |
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"buffer error", /* Z_BUF_ERROR (-5) */ |
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"incompatible version",/* Z_VERSION_ERROR (-6) */ |
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""}; |
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|
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|
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const char * ZEXPORT zlibVersion() |
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{ |
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return ZLIB_VERSION; |
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} |
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|
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uLong ZEXPORT zlibCompileFlags() |
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{ |
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uLong flags; |
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|
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flags = 0; |
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switch ((int)(sizeof(uInt))) { |
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case 2: break; |
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case 4: flags += 1; break; |
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case 8: flags += 2; break; |
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default: flags += 3; |
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} |
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switch ((int)(sizeof(uLong))) { |
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case 2: break; |
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case 4: flags += 1 << 2; break; |
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case 8: flags += 2 << 2; break; |
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default: flags += 3 << 2; |
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} |
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switch ((int)(sizeof(voidpf))) { |
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case 2: break; |
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case 4: flags += 1 << 4; break; |
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case 8: flags += 2 << 4; break; |
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default: flags += 3 << 4; |
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} |
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switch ((int)(sizeof(z_off_t))) { |
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case 2: break; |
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case 4: flags += 1 << 6; break; |
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case 8: flags += 2 << 6; break; |
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default: flags += 3 << 6; |
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} |
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#ifdef DEBUG |
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flags += 1 << 8; |
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#endif |
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#if defined(ASMV) || defined(ASMINF) |
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flags += 1 << 9; |
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#endif |
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#ifdef ZLIB_WINAPI |
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flags += 1 << 10; |
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#endif |
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#ifdef BUILDFIXED |
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flags += 1 << 12; |
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#endif |
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#ifdef DYNAMIC_CRC_TABLE |
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flags += 1 << 13; |
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#endif |
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#ifdef NO_GZCOMPRESS |
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flags += 1L << 16; |
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#endif |
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#ifdef NO_GZIP |
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flags += 1L << 17; |
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#endif |
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#ifdef PKZIP_BUG_WORKAROUND |
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flags += 1L << 20; |
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#endif |
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#ifdef FASTEST |
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flags += 1L << 21; |
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#endif |
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#if defined(STDC) || defined(Z_HAVE_STDARG_H) |
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# ifdef NO_vsnprintf |
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flags += 1L << 25; |
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# ifdef HAS_vsprintf_void |
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flags += 1L << 26; |
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# endif |
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# else |
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# ifdef HAS_vsnprintf_void |
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flags += 1L << 26; |
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# endif |
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# endif |
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#else |
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flags += 1L << 24; |
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# ifdef NO_snprintf |
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flags += 1L << 25; |
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# ifdef HAS_sprintf_void |
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flags += 1L << 26; |
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# endif |
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# else |
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# ifdef HAS_snprintf_void |
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flags += 1L << 26; |
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# endif |
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# endif |
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#endif |
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return flags; |
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} |
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|
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#ifdef DEBUG |
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|
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# ifndef verbose |
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# define verbose 0 |
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# endif |
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int ZLIB_INTERNAL z_verbose = verbose; |
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|
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void ZLIB_INTERNAL z_error (m) |
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char *m; |
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{ |
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fprintf(stderr, "%s\n", m); |
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exit(1); |
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} |
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#endif |
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|
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/* exported to allow conversion of error code to string for compress() and |
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* uncompress() |
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*/ |
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const char * ZEXPORT zError(err) |
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int err; |
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{ |
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return ERR_MSG(err); |
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} |
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|
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#if defined(_WIN32_WCE) |
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/* The Microsoft C Run-Time Library for Windows CE doesn't have |
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* errno. We define it as a global variable to simplify porting. |
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* Its value is always 0 and should not be used. |
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*/ |
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int errno = 0; |
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#endif |
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|
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#ifndef HAVE_MEMCPY |
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|
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void ZLIB_INTERNAL zmemcpy(dest, source, len) |
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Bytef* dest; |
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const Bytef* source; |
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uInt len; |
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{ |
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if (len == 0) return; |
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do { |
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*dest++ = *source++; /* ??? to be unrolled */ |
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} while (--len != 0); |
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} |
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|
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int ZLIB_INTERNAL zmemcmp(s1, s2, len) |
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const Bytef* s1; |
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const Bytef* s2; |
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uInt len; |
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{ |
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uInt j; |
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|
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for (j = 0; j < len; j++) { |
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if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; |
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} |
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return 0; |
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} |
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|
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void ZLIB_INTERNAL zmemzero(dest, len) |
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Bytef* dest; |
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uInt len; |
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{ |
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if (len == 0) return; |
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do { |
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*dest++ = 0; /* ??? to be unrolled */ |
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} while (--len != 0); |
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} |
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#endif |
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|
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#ifndef Z_SOLO |
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|
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#ifdef SYS16BIT |
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|
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#ifdef __TURBOC__ |
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/* Turbo C in 16-bit mode */ |
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|
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# define MY_ZCALLOC |
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|
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/* Turbo C malloc() does not allow dynamic allocation of 64K bytes |
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* and farmalloc(64K) returns a pointer with an offset of 8, so we |
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* must fix the pointer. Warning: the pointer must be put back to its |
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* original form in order to free it, use zcfree(). |
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*/ |
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|
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#define MAX_PTR 10 |
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/* 10*64K = 640K */ |
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|
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local int next_ptr = 0; |
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|
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typedef struct ptr_table_s { |
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voidpf org_ptr; |
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voidpf new_ptr; |
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} ptr_table; |
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|
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local ptr_table table[MAX_PTR]; |
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/* This table is used to remember the original form of pointers |
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* to large buffers (64K). Such pointers are normalized with a zero offset. |
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* Since MSDOS is not a preemptive multitasking OS, this table is not |
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* protected from concurrent access. This hack doesn't work anyway on |
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* a protected system like OS/2. Use Microsoft C instead. |
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*/ |
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|
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voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size) |
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{ |
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voidpf buf = opaque; /* just to make some compilers happy */ |
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ulg bsize = (ulg)items*size; |
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|
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/* If we allocate less than 65520 bytes, we assume that farmalloc |
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* will return a usable pointer which doesn't have to be normalized. |
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*/ |
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if (bsize < 65520L) { |
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buf = farmalloc(bsize); |
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if (*(ush*)&buf != 0) return buf; |
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} else { |
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buf = farmalloc(bsize + 16L); |
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} |
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if (buf == NULL || next_ptr >= MAX_PTR) return NULL; |
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table[next_ptr].org_ptr = buf; |
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|
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/* Normalize the pointer to seg:0 */ |
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*((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; |
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*(ush*)&buf = 0; |
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table[next_ptr++].new_ptr = buf; |
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return buf; |
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} |
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|
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void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) |
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{ |
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int n; |
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if (*(ush*)&ptr != 0) { /* object < 64K */ |
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farfree(ptr); |
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return; |
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} |
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/* Find the original pointer */ |
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for (n = 0; n < next_ptr; n++) { |
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if (ptr != table[n].new_ptr) continue; |
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|
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farfree(table[n].org_ptr); |
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while (++n < next_ptr) { |
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table[n-1] = table[n]; |
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} |
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next_ptr--; |
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return; |
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} |
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ptr = opaque; /* just to make some compilers happy */ |
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Assert(0, "zcfree: ptr not found"); |
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} |
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|
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#endif /* __TURBOC__ */ |
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|
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|
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#ifdef M_I86 |
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/* Microsoft C in 16-bit mode */ |
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|
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# define MY_ZCALLOC |
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|
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#if (!defined(_MSC_VER) || (_MSC_VER <= 600)) |
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# define _halloc halloc |
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# define _hfree hfree |
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#endif |
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|
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voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size) |
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{ |
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if (opaque) opaque = 0; /* to make compiler happy */ |
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return _halloc((long)items, size); |
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} |
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|
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void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr) |
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{ |
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if (opaque) opaque = 0; /* to make compiler happy */ |
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_hfree(ptr); |
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} |
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|
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#endif /* M_I86 */ |
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|
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#endif /* SYS16BIT */ |
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|
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|
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#ifndef MY_ZCALLOC /* Any system without a special alloc function */ |
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|
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#ifndef STDC |
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extern voidp malloc OF((uInt size)); |
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extern voidp calloc OF((uInt items, uInt size)); |
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extern void free OF((voidpf ptr)); |
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#endif |
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|
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voidpf ZLIB_INTERNAL zcalloc (opaque, items, size) |
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voidpf opaque; |
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unsigned items; |
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unsigned size; |
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{ |
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if (opaque) items += size - size; /* make compiler happy */ |
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return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : |
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(voidpf)calloc(items, size); |
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} |
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|
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void ZLIB_INTERNAL zcfree (opaque, ptr) |
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voidpf opaque; |
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voidpf ptr; |
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{ |
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free(ptr); |
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if (opaque) return; /* make compiler happy */ |
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} |
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|
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#endif /* MY_ZCALLOC */ |
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|
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#endif /* !Z_SOLO */ |
