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