ref: d1cebf608b05e45b148108ac6c16ae94f6862097
dir: /sys/src/cmd/bzip2/lib/bzzlib.c/
/* * THIS FILE IS NOT IDENTICAL TO THE ORIGINAL * FROM THE BZIP2 DISTRIBUTION. * * It has been modified, mainly to break the library * into smaller pieces. * * Russ Cox * rsc@plan9.bell-labs.com * July 2000 */ /*-------------------------------------------------------------*/ /*--- Library top-level functions. ---*/ /*--- bzlib.c ---*/ /*-------------------------------------------------------------*/ /*-- This file is a part of bzip2 and/or libbzip2, a program and library for lossless, block-sorting data compression. Copyright (C) 1996-2000 Julian R Seward. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. 3. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. 4. The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Julian Seward, Cambridge, UK. jseward@acm.org bzip2/libbzip2 version 1.0 of 21 March 2000 This program is based on (at least) the work of: Mike Burrows David Wheeler Peter Fenwick Alistair Moffat Radford Neal Ian H. Witten Robert Sedgewick Jon L. Bentley For more information on these sources, see the manual. --*/ /*-- CHANGES ~~~~~~~ 0.9.0 -- original version. 0.9.0a/b -- no changes in this file. 0.9.0c * made zero-length BZ_FLUSH work correctly in bzCompress(). * fixed bzWrite/bzRead to ignore zero-length requests. * fixed bzread to correctly handle read requests after EOF. * wrong parameter order in call to bzDecompressInit in bzBuffToBuffDecompress. Fixed. --*/ #include "os.h" #include "bzlib.h" #include "bzlib_private.h" #include "bzlib_stdio.h" #include "bzlib_stdio_private.h" /*---------------------------------------------------*/ /*-- Code contributed by Yoshioka Tsuneo (QWF00133@niftyserve.or.jp/tsuneo-y@is.aist-nara.ac.jp), to support better zlib compatibility. This code is not _officially_ part of libbzip2 (yet); I haven't tested it, documented it, or considered the threading-safeness of it. If this code breaks, please contact both Yoshioka and me. --*/ /*---------------------------------------------------*/ /*---------------------------------------------------*/ #if defined(_WIN32) || defined(OS2) || defined(MSDOS) # include <fcntl.h> # include <io.h> # define SET_BINARY_MODE(file) setmode(fileno(file),O_BINARY) #else # define SET_BINARY_MODE(file) #endif static BZFILE * bzopen_or_bzdopen ( const char *path, /* no use when bzdopen */ int fd, /* no use when bzdopen */ const char *mode, int open_mode) /* bzopen: 0, bzdopen:1 */ { int bzerr; char unused[BZ_MAX_UNUSED]; int blockSize100k = 9; int writing = 0; char mode2[10] = ""; FILE *fp = NULL; BZFILE *bzfp = NULL; int verbosity = 0; int workFactor = 30; int smallMode = 0; int nUnused = 0; if (mode == NULL) return NULL; while (*mode) { switch (*mode) { case 'r': writing = 0; break; case 'w': writing = 1; break; case 's': smallMode = 1; break; default: if (isdigit((int)(*mode))) { blockSize100k = *mode-'0'; } } mode++; } strcat(mode2, writing ? "w" : "r" ); strcat(mode2,"b"); /* binary mode */ if (open_mode==0) { if (path==NULL || strcmp(path,"")==0) { fp = (writing ? stdout : stdin); SET_BINARY_MODE(fp); } else { fp = fopen(path,mode2); } } else { #ifdef BZ_STRICT_ANSI fp = NULL; #else fp = fdopen(fd,mode2); #endif } if (fp == NULL) return NULL; if (writing) { /* Guard against total chaos and anarchy -- JRS */ if (blockSize100k < 1) blockSize100k = 1; if (blockSize100k > 9) blockSize100k = 9; bzfp = BZ2_bzWriteOpen(&bzerr,fp,blockSize100k, verbosity,workFactor); } else { bzfp = BZ2_bzReadOpen(&bzerr,fp,verbosity,smallMode, unused,nUnused); } if (bzfp == NULL) { if (fp != stdin && fp != stdout) fclose(fp); return NULL; } return bzfp; } /*---------------------------------------------------*/ /*-- open file for read or write. ex) bzopen("file","w9") case path="" or NULL => use stdin or stdout. --*/ BZFILE * BZ_API(BZ2_bzopen) ( const char *path, const char *mode ) { return bzopen_or_bzdopen(path,-1,mode,/*bzopen*/0); } /*---------------------------------------------------*/ BZFILE * BZ_API(BZ2_bzdopen) ( int fd, const char *mode ) { return bzopen_or_bzdopen(NULL,fd,mode,/*bzdopen*/1); } /*---------------------------------------------------*/ int BZ_API(BZ2_bzread) (BZFILE* b, void* buf, int len ) { int bzerr, nread; if (((bzFile*)b)->lastErr == BZ_STREAM_END) return 0; nread = BZ2_bzRead(&bzerr,b,buf,len); if (bzerr == BZ_OK || bzerr == BZ_STREAM_END) { return nread; } else { return -1; } } /*---------------------------------------------------*/ int BZ_API(BZ2_bzwrite) (BZFILE* b, void* buf, int len ) { int bzerr; BZ2_bzWrite(&bzerr,b,buf,len); if(bzerr == BZ_OK){ return len; }else{ return -1; } } /*---------------------------------------------------*/ int BZ_API(BZ2_bzflush) (BZFILE *b) { /* do nothing now... */ return 0; } /*---------------------------------------------------*/ void BZ_API(BZ2_bzclose) (BZFILE* b) { int bzerr; FILE *fp = ((bzFile *)b)->handle; if (b==NULL) {return;} if(((bzFile*)b)->writing){ BZ2_bzWriteClose(&bzerr,b,0,NULL,NULL); if(bzerr != BZ_OK){ BZ2_bzWriteClose(NULL,b,1,NULL,NULL); } }else{ BZ2_bzReadClose(&bzerr,b); } if(fp!=stdin && fp!=stdout){ fclose(fp); } } /*---------------------------------------------------*/ /*-- return last error code --*/ static char *bzerrorstrings[] = { "OK" ,"SEQUENCE_ERROR" ,"PARAM_ERROR" ,"MEM_ERROR" ,"DATA_ERROR" ,"DATA_ERROR_MAGIC" ,"IO_ERROR" ,"UNEXPECTED_EOF" ,"OUTBUFF_FULL" ,"CONFIG_ERROR" ,"???" /* for future */ ,"???" /* for future */ ,"???" /* for future */ ,"???" /* for future */ ,"???" /* for future */ ,"???" /* for future */ }; const char * BZ_API(BZ2_bzerror) (BZFILE *b, int *errnum) { int err = ((bzFile *)b)->lastErr; if(err>0) err = 0; *errnum = err; return bzerrorstrings[err*-1]; }