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099d844292
bzip2/bzip2.c
Julian Seward 099d844292 bzip2-1.0.2
2001-12-30 22:13:13 +01:00

2104 lines
60 KiB
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/*-----------------------------------------------------------*/
/*--- A block-sorting, lossless compressor bzip2.c ---*/
/*-----------------------------------------------------------*/
/*--
This file is a part of bzip2 and/or libbzip2, a program and
library for lossless, block-sorting data compression.
Copyright (C) 1996-2002 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.
--*/
/*----------------------------------------------------*/
/*--- IMPORTANT ---*/
/*----------------------------------------------------*/
/*--
WARNING:
This program and library (attempts to) compress data by
performing several non-trivial transformations on it.
Unless you are 100% familiar with *all* the algorithms
contained herein, and with the consequences of modifying them,
you should NOT meddle with the compression or decompression
machinery. Incorrect changes can and very likely *will*
lead to disasterous loss of data.
DISCLAIMER:
I TAKE NO RESPONSIBILITY FOR ANY LOSS OF DATA ARISING FROM THE
USE OF THIS PROGRAM, HOWSOEVER CAUSED.
Every compression of a file implies an assumption that the
compressed file can be decompressed to reproduce the original.
Great efforts in design, coding and testing have been made to
ensure that this program works correctly. However, the
complexity of the algorithms, and, in particular, the presence
of various special cases in the code which occur with very low
but non-zero probability make it impossible to rule out the
possibility of bugs remaining in the program. DO NOT COMPRESS
ANY DATA WITH THIS PROGRAM AND/OR LIBRARY UNLESS YOU ARE PREPARED
TO ACCEPT THE POSSIBILITY, HOWEVER SMALL, THAT THE DATA WILL
NOT BE RECOVERABLE.
That is not to say this program is inherently unreliable.
Indeed, I very much hope the opposite is true. bzip2/libbzip2
has been carefully constructed and extensively tested.
PATENTS:
To the best of my knowledge, bzip2/libbzip2 does not use any
patented algorithms. However, I do not have the resources
available to carry out a full patent search. Therefore I cannot
give any guarantee of the above statement.
--*/
/*----------------------------------------------------*/
/*--- and now for something much more pleasant :-) ---*/
/*----------------------------------------------------*/
/*---------------------------------------------*/
/*--
Place a 1 beside your platform, and 0 elsewhere.
--*/
/*--
Generic 32-bit Unix.
Also works on 64-bit Unix boxes.
This is the default.
--*/
#define BZ_UNIX 1
/*--
Win32, as seen by Jacob Navia's excellent
port of (Chris Fraser & David Hanson)'s excellent
lcc compiler. Or with MS Visual C.
This is selected automatically if compiled by a compiler which
defines _WIN32, not including the Cygwin GCC.
--*/
#define BZ_LCCWIN32 0
#if defined(_WIN32) && !defined(__CYGWIN__)
#undef BZ_LCCWIN32
#define BZ_LCCWIN32 1
#undef BZ_UNIX
#define BZ_UNIX 0
#endif
/*---------------------------------------------*/
/*--
Some stuff for all platforms.
--*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <math.h>
#include <errno.h>
#include <ctype.h>
#include "bzlib.h"
#define ERROR_IF_EOF(i) { if ((i) == EOF) ioError(); }
#define ERROR_IF_NOT_ZERO(i) { if ((i) != 0) ioError(); }
#define ERROR_IF_MINUS_ONE(i) { if ((i) == (-1)) ioError(); }
/*---------------------------------------------*/
/*--
Platform-specific stuff.
--*/
#if BZ_UNIX
# include <fcntl.h>
# include <sys/types.h>
# include <utime.h>
# include <unistd.h>
# include <sys/stat.h>
# include <sys/times.h>
# define PATH_SEP '/'
# define MY_LSTAT lstat
# define MY_STAT stat
# define MY_S_ISREG S_ISREG
# define MY_S_ISDIR S_ISDIR
# define APPEND_FILESPEC(root, name) \
root=snocString((root), (name))
# define APPEND_FLAG(root, name) \
root=snocString((root), (name))
# define SET_BINARY_MODE(fd) /**/
# ifdef __GNUC__
# define NORETURN __attribute__ ((noreturn))
# else
# define NORETURN /**/
# endif
# ifdef __DJGPP__
# include <io.h>
# include <fcntl.h>
# undef MY_LSTAT
# undef MY_STAT
# define MY_LSTAT stat
# define MY_STAT stat
# undef SET_BINARY_MODE
# define SET_BINARY_MODE(fd) \
do { \
int retVal = setmode ( fileno ( fd ), \
O_BINARY ); \
ERROR_IF_MINUS_ONE ( retVal ); \
} while ( 0 )
# endif
# ifdef __CYGWIN__
# include <io.h>
# include <fcntl.h>
# undef SET_BINARY_MODE
# define SET_BINARY_MODE(fd) \
do { \
int retVal = setmode ( fileno ( fd ), \
O_BINARY ); \
ERROR_IF_MINUS_ONE ( retVal ); \
} while ( 0 )
# endif
#endif /* BZ_UNIX */
#if BZ_LCCWIN32
# include <io.h>
# include <fcntl.h>
# include <sys\stat.h>
# define NORETURN /**/
# define PATH_SEP '\\'
# define MY_LSTAT _stat
# define MY_STAT _stat
# define MY_S_ISREG(x) ((x) & _S_IFREG)
# define MY_S_ISDIR(x) ((x) & _S_IFDIR)
# define APPEND_FLAG(root, name) \
root=snocString((root), (name))
# define APPEND_FILESPEC(root, name) \
root = snocString ((root), (name))
# define SET_BINARY_MODE(fd) \
do { \
int retVal = setmode ( fileno ( fd ), \
O_BINARY ); \
ERROR_IF_MINUS_ONE ( retVal ); \
} while ( 0 )
#endif /* BZ_LCCWIN32 */
/*---------------------------------------------*/
/*--
Some more stuff for all platforms :-)
--*/
typedef char Char;
typedef unsigned char Bool;
typedef unsigned char UChar;
typedef int Int32;
typedef unsigned int UInt32;
typedef short Int16;
typedef unsigned short UInt16;
#define True ((Bool)1)
#define False ((Bool)0)
/*--
IntNative is your platform's `native' int size.
Only here to avoid probs with 64-bit platforms.
--*/
typedef int IntNative;
/*---------------------------------------------------*/
/*--- Misc (file handling) data decls ---*/
/*---------------------------------------------------*/
Int32 verbosity;
Bool keepInputFiles, smallMode, deleteOutputOnInterrupt;
Bool forceOverwrite, testFailsExist, unzFailsExist, noisy;
Int32 numFileNames, numFilesProcessed, blockSize100k;
Int32 exitValue;
/*-- source modes; F==file, I==stdin, O==stdout --*/
#define SM_I2O 1
#define SM_F2O 2
#define SM_F2F 3
/*-- operation modes --*/
#define OM_Z 1
#define OM_UNZ 2
#define OM_TEST 3
Int32 opMode;
Int32 srcMode;
#define FILE_NAME_LEN 1034
Int32 longestFileName;
Char inName [FILE_NAME_LEN];
Char outName[FILE_NAME_LEN];
Char tmpName[FILE_NAME_LEN];
Char *progName;
Char progNameReally[FILE_NAME_LEN];
FILE *outputHandleJustInCase;
Int32 workFactor;
static void panic ( Char* ) NORETURN;
static void ioError ( void ) NORETURN;
static void outOfMemory ( void ) NORETURN;
static void configError ( void ) NORETURN;
static void crcError ( void ) NORETURN;
static void cleanUpAndFail ( Int32 ) NORETURN;
static void compressedStreamEOF ( void ) NORETURN;
static void copyFileName ( Char*, Char* );
static void* myMalloc ( Int32 );
/*---------------------------------------------------*/
/*--- An implementation of 64-bit ints. Sigh. ---*/
/*--- Roll on widespread deployment of ANSI C9X ! ---*/
/*---------------------------------------------------*/
typedef
struct { UChar b[8]; }
UInt64;
static
void uInt64_from_UInt32s ( UInt64* n, UInt32 lo32, UInt32 hi32 )
{
n->b[7] = (UChar)((hi32 >> 24) & 0xFF);
n->b[6] = (UChar)((hi32 >> 16) & 0xFF);
n->b[5] = (UChar)((hi32 >> 8) & 0xFF);
n->b[4] = (UChar) (hi32 & 0xFF);
n->b[3] = (UChar)((lo32 >> 24) & 0xFF);
n->b[2] = (UChar)((lo32 >> 16) & 0xFF);
n->b[1] = (UChar)((lo32 >> 8) & 0xFF);
n->b[0] = (UChar) (lo32 & 0xFF);
}
static
double uInt64_to_double ( UInt64* n )
{
Int32 i;
double base = 1.0;
double sum = 0.0;
for (i = 0; i < 8; i++) {
sum += base * (double)(n->b[i]);
base *= 256.0;
}
return sum;
}
static
Bool uInt64_isZero ( UInt64* n )
{
Int32 i;
for (i = 0; i < 8; i++)
if (n->b[i] != 0) return 0;
return 1;
}
/* Divide *n by 10, and return the remainder. */
static
Int32 uInt64_qrm10 ( UInt64* n )
{
UInt32 rem, tmp;
Int32 i;
rem = 0;
for (i = 7; i >= 0; i--) {
tmp = rem * 256 + n->b[i];
n->b[i] = tmp / 10;
rem = tmp % 10;
}
return rem;
}
/* ... and the Whole Entire Point of all this UInt64 stuff is
so that we can supply the following function.
*/
static
void uInt64_toAscii ( char* outbuf, UInt64* n )
{
Int32 i, q;
UChar buf[32];
Int32 nBuf = 0;
UInt64 n_copy = *n;
do {
q = uInt64_qrm10 ( &n_copy );
buf[nBuf] = q + '0';
nBuf++;
} while (!uInt64_isZero(&n_copy));
outbuf[nBuf] = 0;
for (i = 0; i < nBuf; i++)
outbuf[i] = buf[nBuf-i-1];
}
/*---------------------------------------------------*/
/*--- Processing of complete files and streams ---*/
/*---------------------------------------------------*/
/*---------------------------------------------*/
static
Bool myfeof ( FILE* f )
{
Int32 c = fgetc ( f );
if (c == EOF) return True;
ungetc ( c, f );
return False;
}
/*---------------------------------------------*/
static
void compressStream ( FILE *stream, FILE *zStream )
{
BZFILE* bzf = NULL;
UChar ibuf[5000];
Int32 nIbuf;
UInt32 nbytes_in_lo32, nbytes_in_hi32;
UInt32 nbytes_out_lo32, nbytes_out_hi32;
Int32 bzerr, bzerr_dummy, ret;
SET_BINARY_MODE(stream);
SET_BINARY_MODE(zStream);
if (ferror(stream)) goto errhandler_io;
if (ferror(zStream)) goto errhandler_io;
bzf = BZ2_bzWriteOpen ( &bzerr, zStream,
blockSize100k, verbosity, workFactor );
if (bzerr != BZ_OK) goto errhandler;
if (verbosity >= 2) fprintf ( stderr, "\n" );
while (True) {
if (myfeof(stream)) break;
nIbuf = fread ( ibuf, sizeof(UChar), 5000, stream );
if (ferror(stream)) goto errhandler_io;
if (nIbuf > 0) BZ2_bzWrite ( &bzerr, bzf, (void*)ibuf, nIbuf );
if (bzerr != BZ_OK) goto errhandler;
}
BZ2_bzWriteClose64 ( &bzerr, bzf, 0,
&nbytes_in_lo32, &nbytes_in_hi32,
&nbytes_out_lo32, &nbytes_out_hi32 );
if (bzerr != BZ_OK) goto errhandler;
if (ferror(zStream)) goto errhandler_io;
ret = fflush ( zStream );
if (ret == EOF) goto errhandler_io;
if (zStream != stdout) {
ret = fclose ( zStream );
outputHandleJustInCase = NULL;
if (ret == EOF) goto errhandler_io;
}
outputHandleJustInCase = NULL;
if (ferror(stream)) goto errhandler_io;
ret = fclose ( stream );
if (ret == EOF) goto errhandler_io;
if (verbosity >= 1) {
if (nbytes_in_lo32 == 0 && nbytes_in_hi32 == 0) {
fprintf ( stderr, " no data compressed.\n");
} else {
Char buf_nin[32], buf_nout[32];
UInt64 nbytes_in, nbytes_out;
double nbytes_in_d, nbytes_out_d;
uInt64_from_UInt32s ( &nbytes_in,
nbytes_in_lo32, nbytes_in_hi32 );
uInt64_from_UInt32s ( &nbytes_out,
nbytes_out_lo32, nbytes_out_hi32 );
nbytes_in_d = uInt64_to_double ( &nbytes_in );
nbytes_out_d = uInt64_to_double ( &nbytes_out );
uInt64_toAscii ( buf_nin, &nbytes_in );
uInt64_toAscii ( buf_nout, &nbytes_out );
fprintf ( stderr, "%6.3f:1, %6.3f bits/byte, "
"%5.2f%% saved, %s in, %s out.\n",
nbytes_in_d / nbytes_out_d,
(8.0 * nbytes_out_d) / nbytes_in_d,
100.0 * (1.0 - nbytes_out_d / nbytes_in_d),
buf_nin,
buf_nout
);
}
}
return;
errhandler:
BZ2_bzWriteClose64 ( &bzerr_dummy, bzf, 1,
&nbytes_in_lo32, &nbytes_in_hi32,
&nbytes_out_lo32, &nbytes_out_hi32 );
switch (bzerr) {
case BZ_CONFIG_ERROR:
configError(); break;
case BZ_MEM_ERROR:
outOfMemory (); break;
case BZ_IO_ERROR:
errhandler_io:
ioError(); break;
default:
panic ( "compress:unexpected error" );
}
panic ( "compress:end" );
/*notreached*/
}
/*---------------------------------------------*/
static
Bool uncompressStream ( FILE *zStream, FILE *stream )
{
BZFILE* bzf = NULL;
Int32 bzerr, bzerr_dummy, ret, nread, streamNo, i;
UChar obuf[5000];
UChar unused[BZ_MAX_UNUSED];
Int32 nUnused;
UChar* unusedTmp;
nUnused = 0;
streamNo = 0;
SET_BINARY_MODE(stream);
SET_BINARY_MODE(zStream);
if (ferror(stream)) goto errhandler_io;
if (ferror(zStream)) goto errhandler_io;
while (True) {
bzf = BZ2_bzReadOpen (
&bzerr, zStream, verbosity,
(int)smallMode, unused, nUnused
);
if (bzf == NULL || bzerr != BZ_OK) goto errhandler;
streamNo++;
while (bzerr == BZ_OK) {
nread = BZ2_bzRead ( &bzerr, bzf, obuf, 5000 );
if (bzerr == BZ_DATA_ERROR_MAGIC) goto trycat;
if ((bzerr == BZ_OK || bzerr == BZ_STREAM_END) && nread > 0)
fwrite ( obuf, sizeof(UChar), nread, stream );
if (ferror(stream)) goto errhandler_io;
}
if (bzerr != BZ_STREAM_END) goto errhandler;
BZ2_bzReadGetUnused ( &bzerr, bzf, (void**)(&unusedTmp), &nUnused );
if (bzerr != BZ_OK) panic ( "decompress:bzReadGetUnused" );
for (i = 0; i < nUnused; i++) unused[i] = unusedTmp[i];
BZ2_bzReadClose ( &bzerr, bzf );
if (bzerr != BZ_OK) panic ( "decompress:bzReadGetUnused" );
if (nUnused == 0 && myfeof(zStream)) break;
}
closeok:
if (ferror(zStream)) goto errhandler_io;
ret = fclose ( zStream );
if (ret == EOF) goto errhandler_io;
if (ferror(stream)) goto errhandler_io;
ret = fflush ( stream );
if (ret != 0) goto errhandler_io;
if (stream != stdout) {
ret = fclose ( stream );
outputHandleJustInCase = NULL;
if (ret == EOF) goto errhandler_io;
}
outputHandleJustInCase = NULL;
if (verbosity >= 2) fprintf ( stderr, "\n " );
return True;
trycat:
if (forceOverwrite) {
rewind(zStream);
while (True) {
if (myfeof(zStream)) break;
nread = fread ( obuf, sizeof(UChar), 5000, zStream );
if (ferror(zStream)) goto errhandler_io;
if (nread > 0) fwrite ( obuf, sizeof(UChar), nread, stream );
if (ferror(stream)) goto errhandler_io;
}
goto closeok;
}
errhandler:
BZ2_bzReadClose ( &bzerr_dummy, bzf );
switch (bzerr) {
case BZ_CONFIG_ERROR:
configError(); break;
case BZ_IO_ERROR:
errhandler_io:
ioError(); break;
case BZ_DATA_ERROR:
crcError();
case BZ_MEM_ERROR:
outOfMemory();
case BZ_UNEXPECTED_EOF:
compressedStreamEOF();
case BZ_DATA_ERROR_MAGIC:
if (zStream != stdin) fclose(zStream);
if (stream != stdout) fclose(stream);
if (streamNo == 1) {
return False;
} else {
if (noisy)
fprintf ( stderr,
"\n%s: %s: trailing garbage after EOF ignored\n",
progName, inName );
return True;
}
default:
panic ( "decompress:unexpected error" );
}
panic ( "decompress:end" );
return True; /*notreached*/
}
/*---------------------------------------------*/
static
Bool testStream ( FILE *zStream )
{
BZFILE* bzf = NULL;
Int32 bzerr, bzerr_dummy, ret, nread, streamNo, i;
UChar obuf[5000];
UChar unused[BZ_MAX_UNUSED];
Int32 nUnused;
UChar* unusedTmp;
nUnused = 0;
streamNo = 0;
SET_BINARY_MODE(zStream);
if (ferror(zStream)) goto errhandler_io;
while (True) {
bzf = BZ2_bzReadOpen (
&bzerr, zStream, verbosity,
(int)smallMode, unused, nUnused
);
if (bzf == NULL || bzerr != BZ_OK) goto errhandler;
streamNo++;
while (bzerr == BZ_OK) {
nread = BZ2_bzRead ( &bzerr, bzf, obuf, 5000 );
if (bzerr == BZ_DATA_ERROR_MAGIC) goto errhandler;
}
if (bzerr != BZ_STREAM_END) goto errhandler;
BZ2_bzReadGetUnused ( &bzerr, bzf, (void**)(&unusedTmp), &nUnused );
if (bzerr != BZ_OK) panic ( "test:bzReadGetUnused" );
for (i = 0; i < nUnused; i++) unused[i] = unusedTmp[i];
BZ2_bzReadClose ( &bzerr, bzf );
if (bzerr != BZ_OK) panic ( "test:bzReadGetUnused" );
if (nUnused == 0 && myfeof(zStream)) break;
}
if (ferror(zStream)) goto errhandler_io;
ret = fclose ( zStream );
if (ret == EOF) goto errhandler_io;
if (verbosity >= 2) fprintf ( stderr, "\n " );
return True;
errhandler:
BZ2_bzReadClose ( &bzerr_dummy, bzf );
if (verbosity == 0)
fprintf ( stderr, "%s: %s: ", progName, inName );
switch (bzerr) {
case BZ_CONFIG_ERROR:
configError(); break;
case BZ_IO_ERROR:
errhandler_io:
ioError(); break;
case BZ_DATA_ERROR:
fprintf ( stderr,
"data integrity (CRC) error in data\n" );
return False;
case BZ_MEM_ERROR:
outOfMemory();
case BZ_UNEXPECTED_EOF:
fprintf ( stderr,
"file ends unexpectedly\n" );
return False;
case BZ_DATA_ERROR_MAGIC:
if (zStream != stdin) fclose(zStream);
if (streamNo == 1) {
fprintf ( stderr,
"bad magic number (file not created by bzip2)\n" );
return False;
} else {
if (noisy)
fprintf ( stderr,
"trailing garbage after EOF ignored\n" );
return True;
}
default:
panic ( "test:unexpected error" );
}
panic ( "test:end" );
return True; /*notreached*/
}
/*---------------------------------------------------*/
/*--- Error [non-] handling grunge ---*/
/*---------------------------------------------------*/
/*---------------------------------------------*/
static
void setExit ( Int32 v )
{
if (v > exitValue) exitValue = v;
}
/*---------------------------------------------*/
static
void cadvise ( void )
{
if (noisy)
fprintf (
stderr,
"\nIt is possible that the compressed file(s) have become corrupted.\n"
"You can use the -tvv option to test integrity of such files.\n\n"
"You can use the `bzip2recover' program to attempt to recover\n"
"data from undamaged sections of corrupted files.\n\n"
);
}
/*---------------------------------------------*/
static
void showFileNames ( void )
{
if (noisy)
fprintf (
stderr,
"\tInput file = %s, output file = %s\n",
inName, outName
);
}
/*---------------------------------------------*/
static
void cleanUpAndFail ( Int32 ec )
{
IntNative retVal;
struct MY_STAT statBuf;
if ( srcMode == SM_F2F
&& opMode != OM_TEST
&& deleteOutputOnInterrupt ) {
/* Check whether input file still exists. Delete output file
only if input exists to avoid loss of data. Joerg Prante, 5
January 2002. (JRS 06-Jan-2002: other changes in 1.0.2 mean
this is less likely to happen. But to be ultra-paranoid, we
do the check anyway.) */
retVal = MY_STAT ( inName, &statBuf );
if (retVal == 0) {
if (noisy)
fprintf ( stderr,
"%s: Deleting output file %s, if it exists.\n",
progName, outName );
if (outputHandleJustInCase != NULL)
fclose ( outputHandleJustInCase );
retVal = remove ( outName );
if (retVal != 0)
fprintf ( stderr,
"%s: WARNING: deletion of output file "
"(apparently) failed.\n",
progName );
} else {
fprintf ( stderr,
"%s: WARNING: deletion of output file suppressed\n",
progName );
fprintf ( stderr,
"%s: since input file no longer exists. Output file\n",
progName );
fprintf ( stderr,
"%s: `%s' may be incomplete.\n",
progName, outName );
fprintf ( stderr,
"%s: I suggest doing an integrity test (bzip2 -tv)"
" of it.\n",
progName );
}
}
if (noisy && numFileNames > 0 && numFilesProcessed < numFileNames) {
fprintf ( stderr,
"%s: WARNING: some files have not been processed:\n"
"%s: %d specified on command line, %d not processed yet.\n\n",
progName, progName,
numFileNames, numFileNames - numFilesProcessed );
}
setExit(ec);
exit(exitValue);
}
/*---------------------------------------------*/
static
void panic ( Char* s )
{
fprintf ( stderr,
"\n%s: PANIC -- internal consistency error:\n"
"\t%s\n"
"\tThis is a BUG. Please report it to me at:\n"
"\tjseward@acm.org\n",
progName, s );
showFileNames();
cleanUpAndFail( 3 );
}
/*---------------------------------------------*/
static
void crcError ( void )
{
fprintf ( stderr,
"\n%s: Data integrity error when decompressing.\n",
progName );
showFileNames();
cadvise();
cleanUpAndFail( 2 );
}
/*---------------------------------------------*/
static
void compressedStreamEOF ( void )
{
if (noisy) {
fprintf ( stderr,
"\n%s: Compressed file ends unexpectedly;\n\t"
"perhaps it is corrupted? *Possible* reason follows.\n",
progName );
perror ( progName );
showFileNames();
cadvise();
}
cleanUpAndFail( 2 );
}
/*---------------------------------------------*/
static
void ioError ( void )
{
fprintf ( stderr,
"\n%s: I/O or other error, bailing out. "
"Possible reason follows.\n",
progName );
perror ( progName );
showFileNames();
cleanUpAndFail( 1 );
}
/*---------------------------------------------*/
static
void mySignalCatcher ( IntNative n )
{
fprintf ( stderr,
"\n%s: Control-C or similar caught, quitting.\n",
progName );
cleanUpAndFail(1);
}
/*---------------------------------------------*/
static
void mySIGSEGVorSIGBUScatcher ( IntNative n )
{
if (opMode == OM_Z)
fprintf (
stderr,
"\n%s: Caught a SIGSEGV or SIGBUS whilst compressing.\n"
"\n"
" Possible causes are (most likely first):\n"
" (1) This computer has unreliable memory or cache hardware\n"
" (a surprisingly common problem; try a different machine.)\n"
" (2) A bug in the compiler used to create this executable\n"
" (unlikely, if you didn't compile bzip2 yourself.)\n"
" (3) A real bug in bzip2 -- I hope this should never be the case.\n"
" The user's manual, Section 4.3, has more info on (1) and (2).\n"
" \n"
" If you suspect this is a bug in bzip2, or are unsure about (1)\n"
" or (2), feel free to report it to me at: jseward@acm.org.\n"
" Section 4.3 of the user's manual describes the info a useful\n"
" bug report should have. If the manual is available on your\n"
" system, please try and read it before mailing me. If you don't\n"
" have the manual or can't be bothered to read it, mail me anyway.\n"
"\n",
progName );
else
fprintf (
stderr,
"\n%s: Caught a SIGSEGV or SIGBUS whilst decompressing.\n"
"\n"
" Possible causes are (most likely first):\n"
" (1) The compressed data is corrupted, and bzip2's usual checks\n"
" failed to detect this. Try bzip2 -tvv my_file.bz2.\n"
" (2) This computer has unreliable memory or cache hardware\n"
" (a surprisingly common problem; try a different machine.)\n"
" (3) A bug in the compiler used to create this executable\n"
" (unlikely, if you didn't compile bzip2 yourself.)\n"
" (4) A real bug in bzip2 -- I hope this should never be the case.\n"
" The user's manual, Section 4.3, has more info on (2) and (3).\n"
" \n"
" If you suspect this is a bug in bzip2, or are unsure about (2)\n"
" or (3), feel free to report it to me at: jseward@acm.org.\n"
" Section 4.3 of the user's manual describes the info a useful\n"
" bug report should have. If the manual is available on your\n"
" system, please try and read it before mailing me. If you don't\n"
" have the manual or can't be bothered to read it, mail me anyway.\n"
"\n",
progName );
showFileNames();
if (opMode == OM_Z)
cleanUpAndFail( 3 ); else
{ cadvise(); cleanUpAndFail( 2 ); }
}
/*---------------------------------------------*/
static
void outOfMemory ( void )
{
fprintf ( stderr,
"\n%s: couldn't allocate enough memory\n",
progName );
showFileNames();
cleanUpAndFail(1);
}
/*---------------------------------------------*/
static
void configError ( void )
{
fprintf ( stderr,
"bzip2: I'm not configured correctly for this platform!\n"
"\tI require Int32, Int16 and Char to have sizes\n"
"\tof 4, 2 and 1 bytes to run properly, and they don't.\n"
"\tProbably you can fix this by defining them correctly,\n"
"\tand recompiling. Bye!\n" );
setExit(3);
exit(exitValue);
}
/*---------------------------------------------------*/
/*--- The main driver machinery ---*/
/*---------------------------------------------------*/
/* All rather crufty. The main problem is that input files
are stat()d multiple times before use. This should be
cleaned up.
*/
/*---------------------------------------------*/
static
void pad ( Char *s )
{
Int32 i;
if ( (Int32)strlen(s) >= longestFileName ) return;
for (i = 1; i <= longestFileName - (Int32)strlen(s); i++)
fprintf ( stderr, " " );
}
/*---------------------------------------------*/
static
void copyFileName ( Char* to, Char* from )
{
if ( strlen(from) > FILE_NAME_LEN-10 ) {
fprintf (
stderr,
"bzip2: file name\n`%s'\n"
"is suspiciously (more than %d chars) long.\n"
"Try using a reasonable file name instead. Sorry! :-)\n",
from, FILE_NAME_LEN-10
);
setExit(1);
exit(exitValue);
}
strncpy(to,from,FILE_NAME_LEN-10);
to[FILE_NAME_LEN-10]='\0';
}
/*---------------------------------------------*/
static
Bool fileExists ( Char* name )
{
FILE *tmp = fopen ( name, "rb" );
Bool exists = (tmp != NULL);
if (tmp != NULL) fclose ( tmp );
return exists;
}
/*---------------------------------------------*/
/* Open an output file safely with O_EXCL and good permissions.
This avoids a race condition in versions < 1.0.2, in which
the file was first opened and then had its interim permissions
set safely. We instead use open() to create the file with
the interim permissions required. (--- --- rw-).
For non-Unix platforms, if we are not worrying about
security issues, simple this simply behaves like fopen.
*/
FILE* fopen_output_safely ( Char* name, const char* mode )
{
# if BZ_UNIX
FILE* fp;
IntNative fh;
fh = open(name, O_WRONLY|O_CREAT|O_EXCL, S_IWUSR|S_IRUSR);
if (fh == -1) return NULL;
fp = fdopen(fh, mode);
if (fp == NULL) close(fh);
return fp;
# else
return fopen(name, mode);
# endif
}
/*---------------------------------------------*/
/*--
if in doubt, return True
--*/
static
Bool notAStandardFile ( Char* name )
{
IntNative i;
struct MY_STAT statBuf;
i = MY_LSTAT ( name, &statBuf );
if (i != 0) return True;
if (MY_S_ISREG(statBuf.st_mode)) return False;
return True;
}
/*---------------------------------------------*/
/*--
rac 11/21/98 see if file has hard links to it
--*/
static
Int32 countHardLinks ( Char* name )
{
IntNative i;
struct MY_STAT statBuf;
i = MY_LSTAT ( name, &statBuf );
if (i != 0) return 0;
return (statBuf.st_nlink - 1);
}
/*---------------------------------------------*/
/* Copy modification date, access date, permissions and owner from the
source to destination file. We have to copy this meta-info off
into fileMetaInfo before starting to compress / decompress it,
because doing it afterwards means we get the wrong access time.
To complicate matters, in compress() and decompress() below, the
sequence of tests preceding the call to saveInputFileMetaInfo()
involves calling fileExists(), which in turn establishes its result
by attempting to fopen() the file, and if successful, immediately
fclose()ing it again. So we have to assume that the fopen() call
does not cause the access time field to be updated.
Reading of the man page for stat() (man 2 stat) on RedHat 7.2 seems
to imply that merely doing open() will not affect the access time.
Therefore we merely need to hope that the C library only does
open() as a result of fopen(), and not any kind of read()-ahead
cleverness.
It sounds pretty fragile to me. Whether this carries across
robustly to arbitrary Unix-like platforms (or even works robustly
on this one, RedHat 7.2) is unknown to me. Nevertheless ...
*/
#if BZ_UNIX
static
struct MY_STAT fileMetaInfo;
#endif
static
void saveInputFileMetaInfo ( Char *srcName )
{
# if BZ_UNIX
IntNative retVal;
/* Note use of stat here, not lstat. */
retVal = MY_STAT( srcName, &fileMetaInfo );
ERROR_IF_NOT_ZERO ( retVal );
# endif
}
static
void applySavedMetaInfoToOutputFile ( Char *dstName )
{
# if BZ_UNIX
IntNative retVal;
struct utimbuf uTimBuf;
uTimBuf.actime = fileMetaInfo.st_atime;
uTimBuf.modtime = fileMetaInfo.st_mtime;
retVal = chmod ( dstName, fileMetaInfo.st_mode );
ERROR_IF_NOT_ZERO ( retVal );
retVal = utime ( dstName, &uTimBuf );
ERROR_IF_NOT_ZERO ( retVal );
retVal = chown ( dstName, fileMetaInfo.st_uid, fileMetaInfo.st_gid );
/* chown() will in many cases return with EPERM, which can
be safely ignored.
*/
# endif
}
/*---------------------------------------------*/
static
Bool containsDubiousChars ( Char* name )
{
# if BZ_UNIX
/* On unix, files can contain any characters and the file expansion
* is performed by the shell.
*/
return False;
# else /* ! BZ_UNIX */
/* On non-unix (Win* platforms), wildcard characters are not allowed in
* filenames.
*/
for (; *name != '\0'; name++)
if (*name == '?' || *name == '*') return True;
return False;
# endif /* BZ_UNIX */
}
/*---------------------------------------------*/
#define BZ_N_SUFFIX_PAIRS 4
Char* zSuffix[BZ_N_SUFFIX_PAIRS]
= { ".bz2", ".bz", ".tbz2", ".tbz" };
Char* unzSuffix[BZ_N_SUFFIX_PAIRS]
= { "", "", ".tar", ".tar" };
static
Bool hasSuffix ( Char* s, Char* suffix )
{
Int32 ns = strlen(s);
Int32 nx = strlen(suffix);
if (ns < nx) return False;
if (strcmp(s + ns - nx, suffix) == 0) return True;
return False;
}
static
Bool mapSuffix ( Char* name,
Char* oldSuffix, Char* newSuffix )
{
if (!hasSuffix(name,oldSuffix)) return False;
name[strlen(name)-strlen(oldSuffix)] = 0;
strcat ( name, newSuffix );
return True;
}
/*---------------------------------------------*/
static
void compress ( Char *name )
{
FILE *inStr;
FILE *outStr;
Int32 n, i;
struct MY_STAT statBuf;
deleteOutputOnInterrupt = False;
if (name == NULL && srcMode != SM_I2O)
panic ( "compress: bad modes\n" );
switch (srcMode) {
case SM_I2O:
copyFileName ( inName, "(stdin)" );
copyFileName ( outName, "(stdout)" );
break;
case SM_F2F:
copyFileName ( inName, name );
copyFileName ( outName, name );
strcat ( outName, ".bz2" );
break;
case SM_F2O:
copyFileName ( inName, name );
copyFileName ( outName, "(stdout)" );
break;
}
if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
if (noisy)
fprintf ( stderr, "%s: There are no files matching `%s'.\n",
progName, inName );
setExit(1);
return;
}
if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
progName, inName, strerror(errno) );
setExit(1);
return;
}
for (i = 0; i < BZ_N_SUFFIX_PAIRS; i++) {
if (hasSuffix(inName, zSuffix[i])) {
if (noisy)
fprintf ( stderr,
"%s: Input file %s already has %s suffix.\n",
progName, inName, zSuffix[i] );
setExit(1);
return;
}
}
if ( srcMode == SM_F2F || srcMode == SM_F2O ) {
MY_STAT(inName, &statBuf);
if ( MY_S_ISDIR(statBuf.st_mode) ) {
fprintf( stderr,
"%s: Input file %s is a directory.\n",
progName,inName);
setExit(1);
return;
}
}
if ( srcMode == SM_F2F && !forceOverwrite && notAStandardFile ( inName )) {
if (noisy)
fprintf ( stderr, "%s: Input file %s is not a normal file.\n",
progName, inName );
setExit(1);
return;
}
if ( srcMode == SM_F2F && fileExists ( outName ) ) {
if (forceOverwrite) {
remove(outName);
} else {
fprintf ( stderr, "%s: Output file %s already exists.\n",
progName, outName );
setExit(1);
return;
}
}
if ( srcMode == SM_F2F && !forceOverwrite &&
(n=countHardLinks ( inName )) > 0) {
fprintf ( stderr, "%s: Input file %s has %d other link%s.\n",
progName, inName, n, n > 1 ? "s" : "" );
setExit(1);
return;
}
if ( srcMode == SM_F2F ) {
/* Save the file's meta-info before we open it. Doing it later
means we mess up the access times. */
saveInputFileMetaInfo ( inName );
}
switch ( srcMode ) {
case SM_I2O:
inStr = stdin;
outStr = stdout;
if ( isatty ( fileno ( stdout ) ) ) {
fprintf ( stderr,
"%s: I won't write compressed data to a terminal.\n",
progName );
fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
progName, progName );
setExit(1);
return;
};
break;
case SM_F2O:
inStr = fopen ( inName, "rb" );
outStr = stdout;
if ( isatty ( fileno ( stdout ) ) ) {
fprintf ( stderr,
"%s: I won't write compressed data to a terminal.\n",
progName );
fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
progName, progName );
if ( inStr != NULL ) fclose ( inStr );
setExit(1);
return;
};
if ( inStr == NULL ) {
fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
progName, inName, strerror(errno) );
setExit(1);
return;
};
break;
case SM_F2F:
inStr = fopen ( inName, "rb" );
outStr = fopen_output_safely ( outName, "wb" );
if ( outStr == NULL) {
fprintf ( stderr, "%s: Can't create output file %s: %s.\n",
progName, outName, strerror(errno) );
if ( inStr != NULL ) fclose ( inStr );
setExit(1);
return;
}
if ( inStr == NULL ) {
fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
progName, inName, strerror(errno) );
if ( outStr != NULL ) fclose ( outStr );
setExit(1);
return;
};
break;
default:
panic ( "compress: bad srcMode" );
break;
}
if (verbosity >= 1) {
fprintf ( stderr, " %s: ", inName );
pad ( inName );
fflush ( stderr );
}
/*--- Now the input and output handles are sane. Do the Biz. ---*/
outputHandleJustInCase = outStr;
deleteOutputOnInterrupt = True;
compressStream ( inStr, outStr );
outputHandleJustInCase = NULL;
/*--- If there was an I/O error, we won't get here. ---*/
if ( srcMode == SM_F2F ) {
applySavedMetaInfoToOutputFile ( outName );
deleteOutputOnInterrupt = False;
if ( !keepInputFiles ) {
IntNative retVal = remove ( inName );
ERROR_IF_NOT_ZERO ( retVal );
}
}
deleteOutputOnInterrupt = False;
}
/*---------------------------------------------*/
static
void uncompress ( Char *name )
{
FILE *inStr;
FILE *outStr;
Int32 n, i;
Bool magicNumberOK;
Bool cantGuess;
struct MY_STAT statBuf;
deleteOutputOnInterrupt = False;
if (name == NULL && srcMode != SM_I2O)
panic ( "uncompress: bad modes\n" );
cantGuess = False;
switch (srcMode) {
case SM_I2O:
copyFileName ( inName, "(stdin)" );
copyFileName ( outName, "(stdout)" );
break;
case SM_F2F:
copyFileName ( inName, name );
copyFileName ( outName, name );
for (i = 0; i < BZ_N_SUFFIX_PAIRS; i++)
if (mapSuffix(outName,zSuffix[i],unzSuffix[i]))
goto zzz;
cantGuess = True;
strcat ( outName, ".out" );
break;
case SM_F2O:
copyFileName ( inName, name );
copyFileName ( outName, "(stdout)" );
break;
}
zzz:
if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
if (noisy)
fprintf ( stderr, "%s: There are no files matching `%s'.\n",
progName, inName );
setExit(1);
return;
}
if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
progName, inName, strerror(errno) );
setExit(1);
return;
}
if ( srcMode == SM_F2F || srcMode == SM_F2O ) {
MY_STAT(inName, &statBuf);
if ( MY_S_ISDIR(statBuf.st_mode) ) {
fprintf( stderr,
"%s: Input file %s is a directory.\n",
progName,inName);
setExit(1);
return;
}
}
if ( srcMode == SM_F2F && !forceOverwrite && notAStandardFile ( inName )) {
if (noisy)
fprintf ( stderr, "%s: Input file %s is not a normal file.\n",
progName, inName );
setExit(1);
return;
}
if ( /* srcMode == SM_F2F implied && */ cantGuess ) {
if (noisy)
fprintf ( stderr,
"%s: Can't guess original name for %s -- using %s\n",
progName, inName, outName );
/* just a warning, no return */
}
if ( srcMode == SM_F2F && fileExists ( outName ) ) {
if (forceOverwrite) {
remove(outName);
} else {
fprintf ( stderr, "%s: Output file %s already exists.\n",
progName, outName );
setExit(1);
return;
}
}
if ( srcMode == SM_F2F && !forceOverwrite &&
(n=countHardLinks ( inName ) ) > 0) {
fprintf ( stderr, "%s: Input file %s has %d other link%s.\n",
progName, inName, n, n > 1 ? "s" : "" );
setExit(1);
return;
}
if ( srcMode == SM_F2F ) {
/* Save the file's meta-info before we open it. Doing it later
means we mess up the access times. */
saveInputFileMetaInfo ( inName );
}
switch ( srcMode ) {
case SM_I2O:
inStr = stdin;
outStr = stdout;
if ( isatty ( fileno ( stdin ) ) ) {
fprintf ( stderr,
"%s: I won't read compressed data from a terminal.\n",
progName );
fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
progName, progName );
setExit(1);
return;
};
break;
case SM_F2O:
inStr = fopen ( inName, "rb" );
outStr = stdout;
if ( inStr == NULL ) {
fprintf ( stderr, "%s: Can't open input file %s:%s.\n",
progName, inName, strerror(errno) );
if ( inStr != NULL ) fclose ( inStr );
setExit(1);
return;
};
break;
case SM_F2F:
inStr = fopen ( inName, "rb" );
outStr = fopen_output_safely ( outName, "wb" );
if ( outStr == NULL) {
fprintf ( stderr, "%s: Can't create output file %s: %s.\n",
progName, outName, strerror(errno) );
if ( inStr != NULL ) fclose ( inStr );
setExit(1);
return;
}
if ( inStr == NULL ) {
fprintf ( stderr, "%s: Can't open input file %s: %s.\n",
progName, inName, strerror(errno) );
if ( outStr != NULL ) fclose ( outStr );
setExit(1);
return;
};
break;
default:
panic ( "uncompress: bad srcMode" );
break;
}
if (verbosity >= 1) {
fprintf ( stderr, " %s: ", inName );
pad ( inName );
fflush ( stderr );
}
/*--- Now the input and output handles are sane. Do the Biz. ---*/
outputHandleJustInCase = outStr;
deleteOutputOnInterrupt = True;
magicNumberOK = uncompressStream ( inStr, outStr );
outputHandleJustInCase = NULL;
/*--- If there was an I/O error, we won't get here. ---*/
if ( magicNumberOK ) {
if ( srcMode == SM_F2F ) {
applySavedMetaInfoToOutputFile ( outName );
deleteOutputOnInterrupt = False;
if ( !keepInputFiles ) {
IntNative retVal = remove ( inName );
ERROR_IF_NOT_ZERO ( retVal );
}
}
} else {
unzFailsExist = True;
deleteOutputOnInterrupt = False;
if ( srcMode == SM_F2F ) {
IntNative retVal = remove ( outName );
ERROR_IF_NOT_ZERO ( retVal );
}
}
deleteOutputOnInterrupt = False;
if ( magicNumberOK ) {
if (verbosity >= 1)
fprintf ( stderr, "done\n" );
} else {
setExit(2);
if (verbosity >= 1)
fprintf ( stderr, "not a bzip2 file.\n" ); else
fprintf ( stderr,
"%s: %s is not a bzip2 file.\n",
progName, inName );
}
}
/*---------------------------------------------*/
static
void testf ( Char *name )
{
FILE *inStr;
Bool allOK;
struct MY_STAT statBuf;
deleteOutputOnInterrupt = False;
if (name == NULL && srcMode != SM_I2O)
panic ( "testf: bad modes\n" );
copyFileName ( outName, "(none)" );
switch (srcMode) {
case SM_I2O: copyFileName ( inName, "(stdin)" ); break;
case SM_F2F: copyFileName ( inName, name ); break;
case SM_F2O: copyFileName ( inName, name ); break;
}
if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
if (noisy)
fprintf ( stderr, "%s: There are no files matching `%s'.\n",
progName, inName );
setExit(1);
return;
}
if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
fprintf ( stderr, "%s: Can't open input %s: %s.\n",
progName, inName, strerror(errno) );
setExit(1);
return;
}
if ( srcMode != SM_I2O ) {
MY_STAT(inName, &statBuf);
if ( MY_S_ISDIR(statBuf.st_mode) ) {
fprintf( stderr,
"%s: Input file %s is a directory.\n",
progName,inName);
setExit(1);
return;
}
}
switch ( srcMode ) {
case SM_I2O:
if ( isatty ( fileno ( stdin ) ) ) {
fprintf ( stderr,
"%s: I won't read compressed data from a terminal.\n",
progName );
fprintf ( stderr, "%s: For help, type: `%s --help'.\n",
progName, progName );
setExit(1);
return;
};
inStr = stdin;
break;
case SM_F2O: case SM_F2F:
inStr = fopen ( inName, "rb" );
if ( inStr == NULL ) {
fprintf ( stderr, "%s: Can't open input file %s:%s.\n",
progName, inName, strerror(errno) );
setExit(1);
return;
};
break;
default:
panic ( "testf: bad srcMode" );
break;
}
if (verbosity >= 1) {
fprintf ( stderr, " %s: ", inName );
pad ( inName );
fflush ( stderr );
}
/*--- Now the input handle is sane. Do the Biz. ---*/
outputHandleJustInCase = NULL;
allOK = testStream ( inStr );
if (allOK && verbosity >= 1) fprintf ( stderr, "ok\n" );
if (!allOK) testFailsExist = True;
}
/*---------------------------------------------*/
static
void license ( void )
{
fprintf ( stderr,
"bzip2, a block-sorting file compressor. "
"Version %s.\n"
" \n"
" Copyright (C) 1996-2002 by Julian Seward.\n"
" \n"
" This program is free software; you can redistribute it and/or modify\n"
" it under the terms set out in the LICENSE file, which is included\n"
" in the bzip2-1.0 source distribution.\n"
" \n"
" This program is distributed in the hope that it will be useful,\n"
" but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n"
" LICENSE file for more details.\n"
" \n",
BZ2_bzlibVersion()
);
}
/*---------------------------------------------*/
static
void usage ( Char *fullProgName )
{
fprintf (
stderr,
"bzip2, a block-sorting file compressor. "
"Version %s.\n"
"\n usage: %s [flags and input files in any order]\n"
"\n"
" -h --help print this message\n"
" -d --decompress force decompression\n"
" -z --compress force compression\n"
" -k --keep keep (don't delete) input files\n"
" -f --force overwrite existing output files\n"
" -t --test test compressed file integrity\n"
" -c --stdout output to standard out\n"
" -q --quiet suppress noncritical error messages\n"
" -v --verbose be verbose (a 2nd -v gives more)\n"
" -L --license display software version & license\n"
" -V --version display software version & license\n"
" -s --small use less memory (at most 2500k)\n"
" -1 .. -9 set block size to 100k .. 900k\n"
" --fast alias for -1\n"
" --best alias for -9\n"
"\n"
" If invoked as `bzip2', default action is to compress.\n"
" as `bunzip2', default action is to decompress.\n"
" as `bzcat', default action is to decompress to stdout.\n"
"\n"
" If no file names are given, bzip2 compresses or decompresses\n"
" from standard input to standard output. You can combine\n"
" short flags, so `-v -4' means the same as -v4 or -4v, &c.\n"
# if BZ_UNIX
"\n"
# endif
,
BZ2_bzlibVersion(),
fullProgName
);
}
/*---------------------------------------------*/
static
void redundant ( Char* flag )
{
fprintf (
stderr,
"%s: %s is redundant in versions 0.9.5 and above\n",
progName, flag );
}
/*---------------------------------------------*/
/*--
All the garbage from here to main() is purely to
implement a linked list of command-line arguments,
into which main() copies argv[1 .. argc-1].
The purpose of this exercise is to facilitate
the expansion of wildcard characters * and ? in
filenames for OSs which don't know how to do it
themselves, like MSDOS, Windows 95 and NT.
The actual Dirty Work is done by the platform-
specific macro APPEND_FILESPEC.
--*/
typedef
struct zzzz {
Char *name;
struct zzzz *link;
}
Cell;
/*---------------------------------------------*/
static
void *myMalloc ( Int32 n )
{
void* p;
p = malloc ( (size_t)n );
if (p == NULL) outOfMemory ();
return p;
}
/*---------------------------------------------*/
static
Cell *mkCell ( void )
{
Cell *c;
c = (Cell*) myMalloc ( sizeof ( Cell ) );
c->name = NULL;
c->link = NULL;
return c;
}
/*---------------------------------------------*/
static
Cell *snocString ( Cell *root, Char *name )
{
if (root == NULL) {
Cell *tmp = mkCell();
tmp->name = (Char*) myMalloc ( 5 + strlen(name) );
strcpy ( tmp->name, name );
return tmp;
} else {
Cell *tmp = root;
while (tmp->link != NULL) tmp = tmp->link;
tmp->link = snocString ( tmp->link, name );
return root;
}
}
/*---------------------------------------------*/
static
void addFlagsFromEnvVar ( Cell** argList, Char* varName )
{
Int32 i, j, k;
Char *envbase, *p;
envbase = getenv(varName);
if (envbase != NULL) {
p = envbase;
i = 0;
while (True) {
if (p[i] == 0) break;
p += i;
i = 0;
while (isspace((Int32)(p[0]))) p++;
while (p[i] != 0 && !isspace((Int32)(p[i]))) i++;
if (i > 0) {
k = i; if (k > FILE_NAME_LEN-10) k = FILE_NAME_LEN-10;
for (j = 0; j < k; j++) tmpName[j] = p[j];
tmpName[k] = 0;
APPEND_FLAG(*argList, tmpName);
}
}
}
}
/*---------------------------------------------*/
#define ISFLAG(s) (strcmp(aa->name, (s))==0)
IntNative main ( IntNative argc, Char *argv[] )
{
Int32 i, j;
Char *tmp;
Cell *argList;
Cell *aa;
Bool decode;
/*-- Be really really really paranoid :-) --*/
if (sizeof(Int32) != 4 || sizeof(UInt32) != 4 ||
sizeof(Int16) != 2 || sizeof(UInt16) != 2 ||
sizeof(Char) != 1 || sizeof(UChar) != 1)
configError();
/*-- Initialise --*/
outputHandleJustInCase = NULL;
smallMode = False;
keepInputFiles = False;
forceOverwrite = False;
noisy = True;
verbosity = 0;
blockSize100k = 9;
testFailsExist = False;
unzFailsExist = False;
numFileNames = 0;
numFilesProcessed = 0;
workFactor = 30;
deleteOutputOnInterrupt = False;
exitValue = 0;
i = j = 0; /* avoid bogus warning from egcs-1.1.X */
/*-- Set up signal handlers for mem access errors --*/
signal (SIGSEGV, mySIGSEGVorSIGBUScatcher);
# if BZ_UNIX
# ifndef __DJGPP__
signal (SIGBUS, mySIGSEGVorSIGBUScatcher);
# endif
# endif
copyFileName ( inName, "(none)" );
copyFileName ( outName, "(none)" );
copyFileName ( progNameReally, argv[0] );
progName = &progNameReally[0];
for (tmp = &progNameReally[0]; *tmp != '\0'; tmp++)
if (*tmp == PATH_SEP) progName = tmp + 1;
/*-- Copy flags from env var BZIP2, and
expand filename wildcards in arg list.
--*/
argList = NULL;
addFlagsFromEnvVar ( &argList, "BZIP2" );
addFlagsFromEnvVar ( &argList, "BZIP" );
for (i = 1; i <= argc-1; i++)
APPEND_FILESPEC(argList, argv[i]);
/*-- Find the length of the longest filename --*/
longestFileName = 7;
numFileNames = 0;
decode = True;
for (aa = argList; aa != NULL; aa = aa->link) {
if (ISFLAG("--")) { decode = False; continue; }
if (aa->name[0] == '-' && decode) continue;
numFileNames++;
if (longestFileName < (Int32)strlen(aa->name) )
longestFileName = (Int32)strlen(aa->name);
}
/*-- Determine source modes; flag handling may change this too. --*/
if (numFileNames == 0)
srcMode = SM_I2O; else srcMode = SM_F2F;
/*-- Determine what to do (compress/uncompress/test/cat). --*/
/*-- Note that subsequent flag handling may change this. --*/
opMode = OM_Z;
if ( (strstr ( progName, "unzip" ) != 0) ||
(strstr ( progName, "UNZIP" ) != 0) )
opMode = OM_UNZ;
if ( (strstr ( progName, "z2cat" ) != 0) ||
(strstr ( progName, "Z2CAT" ) != 0) ||
(strstr ( progName, "zcat" ) != 0) ||
(strstr ( progName, "ZCAT" ) != 0) ) {
opMode = OM_UNZ;
srcMode = (numFileNames == 0) ? SM_I2O : SM_F2O;
}
/*-- Look at the flags. --*/
for (aa = argList; aa != NULL; aa = aa->link) {
if (ISFLAG("--")) break;
if (aa->name[0] == '-' && aa->name[1] != '-') {
for (j = 1; aa->name[j] != '\0'; j++) {
switch (aa->name[j]) {
case 'c': srcMode = SM_F2O; break;
case 'd': opMode = OM_UNZ; break;
case 'z': opMode = OM_Z; break;
case 'f': forceOverwrite = True; break;
case 't': opMode = OM_TEST; break;
case 'k': keepInputFiles = True; break;
case 's': smallMode = True; break;
case 'q': noisy = False; break;
case '1': blockSize100k = 1; break;
case '2': blockSize100k = 2; break;
case '3': blockSize100k = 3; break;
case '4': blockSize100k = 4; break;
case '5': blockSize100k = 5; break;
case '6': blockSize100k = 6; break;
case '7': blockSize100k = 7; break;
case '8': blockSize100k = 8; break;
case '9': blockSize100k = 9; break;
case 'V':
case 'L': license(); break;
case 'v': verbosity++; break;
case 'h': usage ( progName );
exit ( 0 );
break;
default: fprintf ( stderr, "%s: Bad flag `%s'\n",
progName, aa->name );
usage ( progName );
exit ( 1 );
break;
}
}
}
}
/*-- And again ... --*/
for (aa = argList; aa != NULL; aa = aa->link) {
if (ISFLAG("--")) break;
if (ISFLAG("--stdout")) srcMode = SM_F2O; else
if (ISFLAG("--decompress")) opMode = OM_UNZ; else
if (ISFLAG("--compress")) opMode = OM_Z; else
if (ISFLAG("--force")) forceOverwrite = True; else
if (ISFLAG("--test")) opMode = OM_TEST; else
if (ISFLAG("--keep")) keepInputFiles = True; else
if (ISFLAG("--small")) smallMode = True; else
if (ISFLAG("--quiet")) noisy = False; else
if (ISFLAG("--version")) license(); else
if (ISFLAG("--license")) license(); else
if (ISFLAG("--exponential")) workFactor = 1; else
if (ISFLAG("--repetitive-best")) redundant(aa->name); else
if (ISFLAG("--repetitive-fast")) redundant(aa->name); else
if (ISFLAG("--fast")) blockSize100k = 1; else
if (ISFLAG("--best")) blockSize100k = 9; else
if (ISFLAG("--verbose")) verbosity++; else
if (ISFLAG("--help")) { usage ( progName ); exit ( 0 ); }
else
if (strncmp ( aa->name, "--", 2) == 0) {
fprintf ( stderr, "%s: Bad flag `%s'\n", progName, aa->name );
usage ( progName );
exit ( 1 );
}
}
if (verbosity > 4) verbosity = 4;
if (opMode == OM_Z && smallMode && blockSize100k > 2)
blockSize100k = 2;
if (opMode == OM_TEST && srcMode == SM_F2O) {
fprintf ( stderr, "%s: -c and -t cannot be used together.\n",
progName );
exit ( 1 );
}
if (srcMode == SM_F2O && numFileNames == 0)
srcMode = SM_I2O;
if (opMode != OM_Z) blockSize100k = 0;
if (srcMode == SM_F2F) {
signal (SIGINT, mySignalCatcher);
signal (SIGTERM, mySignalCatcher);
# if BZ_UNIX
signal (SIGHUP, mySignalCatcher);
# endif
}
if (opMode == OM_Z) {
if (srcMode == SM_I2O) {
compress ( NULL );
} else {
decode = True;
for (aa = argList; aa != NULL; aa = aa->link) {
if (ISFLAG("--")) { decode = False; continue; }
if (aa->name[0] == '-' && decode) continue;
numFilesProcessed++;
compress ( aa->name );
}
}
}
else
if (opMode == OM_UNZ) {
unzFailsExist = False;
if (srcMode == SM_I2O) {
uncompress ( NULL );
} else {
decode = True;
for (aa = argList; aa != NULL; aa = aa->link) {
if (ISFLAG("--")) { decode = False; continue; }
if (aa->name[0] == '-' && decode) continue;
numFilesProcessed++;
uncompress ( aa->name );
}
}
if (unzFailsExist) {
setExit(2);
exit(exitValue);
}
}
else {
testFailsExist = False;
if (srcMode == SM_I2O) {
testf ( NULL );
} else {
decode = True;
for (aa = argList; aa != NULL; aa = aa->link) {
if (ISFLAG("--")) { decode = False; continue; }
if (aa->name[0] == '-' && decode) continue;
numFilesProcessed++;
testf ( aa->name );
}
}
if (testFailsExist && noisy) {
fprintf ( stderr,
"\n"
"You can use the `bzip2recover' program to attempt to recover\n"
"data from undamaged sections of corrupted files.\n\n"
);
setExit(2);
exit(exitValue);
}
}
/* Free the argument list memory to mollify leak detectors
(eg) Purify, Checker. Serves no other useful purpose.
*/
aa = argList;
while (aa != NULL) {
Cell* aa2 = aa->link;
if (aa->name != NULL) free(aa->name);
free(aa);
aa = aa2;
}
return exitValue;
}
/*-----------------------------------------------------------*/
/*--- end bzip2.c ---*/
/*-----------------------------------------------------------*/
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