/* zutil.c -- target dependent utility functions for the compression library * Copyright (C) 1995-2003 Jean-loup Gailly. * For conditions of distribution and use, see copyright notice in zlib.h */ /* @(#) $Id$ */ #include "zutil.h" #ifndef NO_DUMMY_DECL struct internal_state {int dummy;}; /* for buggy compilers */ #endif #ifndef STDC extern void exit OF((int)); #endif 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) */ ""}; const char * ZEXPORT zlibVersion() 31 { 31 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 += 1 << 16; #endif #ifdef NO_GZIP flags += 1 << 17; #endif #ifdef PKZIP_BUG_WORKAROUND flags += 1 << 20; #endif #ifdef FASTEST flags += 1 << 21; #endif #ifdef STDC # ifdef NO_vsnprintf flags += 1 << 25; # ifdef HAS_vsprintf_void flags += 1 << 26; # endif # else # ifdef HAS_vsnprintf_void flags += 1 << 26; # endif # endif #else flags += 1 << 24; # ifdef NO_snprintf flags += 1 << 25; # ifdef HAS_sprintf_void flags += 1 << 26; # endif # else # ifdef HAS_snprintf_void flags += 1 << 26; # endif # endif #endif ###### return flags; } #ifdef DEBUG # ifndef verbose # define verbose 0 # endif int 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) /* does not exist on WCE */ int errno = 0; #endif #ifndef HAVE_MEMCPY void 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 #endif voidpf 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 STDC extern voidp malloc OF((uInt size)); extern voidp calloc OF((uInt items, uInt size)); extern void free OF((voidpf ptr)); #endif voidpf zcalloc (opaque, items, size) voidpf opaque; unsigned items; unsigned size; 463 { 463 if (opaque) items += size - size; /* make compiler happy */ 463 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : (voidpf)calloc(items, size); } void zcfree (opaque, ptr) voidpf opaque; voidpf ptr; 463 { 463 free(ptr); 463 if (opaque) return; /* make compiler happy */ } #endif /* MY_ZCALLOC */