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