📄 bzip2.c
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/*---------------------------------------------------*/
/*---------------------------------------------*/
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 );
if (ret == EOF) goto errhandler_io;
}
if (ferror(stream)) goto errhandler_io;
ret = fclose ( stream );
if (ret == EOF) goto errhandler_io;
if (nbytes_in_lo32 == 0 && nbytes_in_hi32 == 0)
nbytes_in_lo32 = 1;
if (verbosity >= 1) {
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 errhandler;
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;
}
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 );
if (ret == EOF) goto errhandler_io;
}
if (verbosity >= 2) fprintf ( stderr, "\n " );
return True;
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;
if ( srcMode == SM_F2F
&& opMode != OM_TEST
&& deleteOutputOnInterrupt ) {
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 );
}
if (noisy && numFileNames > 0 && numFilesProcessed < numFileNames) {
fprintf ( stderr,
"%s: WARNING: some files have not been processed:\n"
"\t%d specified on command line, %d not processed yet.\n\n",
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 )
{
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 )
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