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gcc/fastjar/compress.c
Kelley Cook cd1414ee2e all files: Update FSF address. 
2005-06-29  Kelley Cook  <kcook@gcc.gnu.org>

	* all files: Update FSF address.

From-SVN: r101414
2005-06-29 02:59:06 +00:00

562 lines
13 KiB
C
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/* $Id: compress.c,v 1.2 2000/12/14 18:45:35 ghazi Exp $
$Log: compress.c,v $
Revision 1.2 2000/12/14 18:45:35 ghazi
Warning fixes:
* compress.c: Include stdlib.h and compress.h.
(rcsid): Delete.
(report_str_error): Make static.
(ez_inflate_str): Delete unused variable. Add parens in if-stmt.
(hrd_inflate_str): Likewise.
* compress.h (init_compression, end_compression, init_inflation,
end_inflation): Prototype void arguments.
* dostime.c (rcsid): Delete.
* jargrep.c: Include ctype.h, stdlib.h, zlib.h and compress.h.
Make functions static. Cast ctype function argument to `unsigned
char'. Add parens in if-stmts. Constify.
(Usage): Change into a macro.
(jargrep): Remove unused parameter.
* jartool.c: Constify. Add parens in if-stmts. Align
signed/unsigned char pointers in functions calls using casts.
(rcsid): Delete.
(list_jar): Fix printf format specifier.
(usage): Chop long string into bits. Reformat.
* pushback.c (rcsid): Delete.
Revision 1.1 2000/12/09 03:08:23 apbianco
2000-12-08 Alexandre Petit-Bianco <apbianco@cygnus.com>
* fastjar: Imported.
Revision 1.7 2000/09/13 14:02:02 cory
Reformatted some of the code to more closly match the layout of the orriginal
fastjar utility.
Revision 1.6 2000/09/12 22:29:36 cory
Jargrep now seems to do what I want it to do. Performs properly on Linux x86,
will test some other platforms later.
Revision 1.1.1.1 1999/12/06 03:09:16 toast
initial checkin..
Revision 1.7 1999/05/10 08:50:05 burnsbr
*** empty log message ***
Revision 1.6 1999/05/10 08:38:44 burnsbr
*** empty log message ***
Revision 1.5 1999/05/10 08:30:29 burnsbr
added inflation code
Revision 1.4 1999/04/27 10:03:33 burnsbr
added configure support
Revision 1.3 1999/04/26 02:35:32 burnsbr
compression now works.. yahoo
Revision 1.2 1999/04/23 12:01:59 burnsbr
added licence stuff.
Revision 1.1 1999/04/23 11:58:25 burnsbr
Initial revision
*/
/*
compress.c - code for handling deflation
Copyright (C) 1999 Bryan Burns
Copyright (C) 2004 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include <zlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif
#include <sys/types.h>
#include "jartool.h"
#include "pushback.h"
#include "compress.h"
#include "shift.h"
int write_data (int, void *, size_t, struct zipentry *);
extern int seekable;
extern off_t end_of_entries;
static z_stream zs;
void init_compression(){
memset(&zs, 0, sizeof(z_stream));
zs.zalloc = Z_NULL;
zs.zfree = Z_NULL;
zs.opaque = Z_NULL;
/* Why -MAX_WBITS? zlib has an undocumented feature, where if the windowbits
parameter is negative, it omits the zlib header, which seems to kill
any other zip/unzip program. This caused me SO much pain.. */
if(deflateInit2(&zs, Z_DEFAULT_COMPRESSION, Z_DEFLATED, -MAX_WBITS,
9, Z_DEFAULT_STRATEGY) != Z_OK){
fprintf(stderr, "Error initializing deflation!\n");
exit(1);
}
}
int
write_data (int fd, void *buf, size_t len, struct zipentry *ze)
{
#ifdef WITH_SHIFT_DOWN
struct zipentry *next = NULL;
off_t here = lseek (fd, 0, SEEK_CUR);
/*
* If we are updating and there is not enough space before the next
* entry, expand the file.
*/
if (ze)
{
next = ze->next_entry;
if (next && here + len >= next->offset)
{
if (shift_down (fd, next->offset, (here + len) - next->offset, next))
{
perror ("can't expand file");
exit (1);
}
}
}
#endif /* WITH_SHIFT_DOWN */
return write (fd, buf, len);
}
int compress_file(int in_fd, int out_fd, struct zipentry *ze,
struct zipentry *existing)
{
Bytef in_buff[RDSZ];
Bytef out_buff[RDSZ];
unsigned int rdamt, wramt;
unsigned long tr = 0;
int rtval;
rdamt = 0;
zs.avail_in = 0;
zs.next_in = in_buff;
zs.next_out = out_buff;
zs.avail_out = (uInt)RDSZ;
ze->crc = crc32(0L, Z_NULL, 0);
for(; ;){
/* If deflate is out of input, fill the input buffer for it */
if(zs.avail_in == 0 && zs.avail_out > 0){
if((rtval = read(in_fd, in_buff, RDSZ)) == 0)
break;
if(rtval == -1){
perror("read");
exit(1);
}
rdamt = rtval;
/* compute the CRC while we're at it */
ze->crc = crc32(ze->crc, in_buff, rdamt);
/* update the total amount read sofar */
tr += rdamt;
zs.next_in = in_buff;
zs.avail_in = rdamt;
}
/* deflate the data */
if(deflate(&zs, 0) != Z_OK){
fprintf(stderr, "Error deflating! %s:%d\n", __FILE__, __LINE__);
exit(1);
}
/* If the output buffer is full, dump it to disk */
if(zs.avail_out == 0){
if (write_data (out_fd, out_buff, RDSZ, existing) != RDSZ)
{
perror("write");
exit(1);
}
/* clear the output buffer */
zs.next_out = out_buff;
zs.avail_out = (uInt)RDSZ;
}
}
/* If we have any data waiting in the buffer after we're done with the file
we can flush it */
if(zs.avail_out < RDSZ){
wramt = RDSZ - zs.avail_out;
if (write_data (out_fd, out_buff, wramt, existing) != (int)wramt)
{
perror("write");
exit(1);
}
/* clear the output buffer */
zs.next_out = out_buff;
zs.avail_out = (uInt)RDSZ;
}
/* finish deflation. This purges zlib's internal data buffers */
while(deflate(&zs, Z_FINISH) == Z_OK){
wramt = RDSZ - zs.avail_out;
if (write_data (out_fd, out_buff, wramt, existing) != (int)wramt)
{
perror("write");
exit(1);
}
zs.next_out = out_buff;
zs.avail_out = (uInt)RDSZ;
}
/* If there's any data left in the buffer, write it out */
if(zs.avail_out != RDSZ){
wramt = RDSZ - zs.avail_out;
if (write_data (out_fd, out_buff, wramt, existing) != (int)wramt)
{
perror("write");
exit(1);
}
}
/* update fastjar's entry information */
ze->usize = (ub4)zs.total_in;
ze->csize = (ub4)zs.total_out;
/* Reset the deflation for the next time around */
if(deflateReset(&zs) != Z_OK){
fprintf(stderr, "Error resetting deflation\n");
exit(1);
}
return 0;
}
void end_compression(){
int rtval;
/* Oddly enough, zlib always returns Z_DATA_ERROR if you specify no
zlib header. Go fig. */
if((rtval = deflateEnd(&zs)) != Z_OK && rtval != Z_DATA_ERROR){
fprintf(stderr, "Error calling deflateEnd\n");
fprintf(stderr, "error: (%d) %s\n", rtval, zs.msg);
exit(1);
}
}
void init_inflation(){
memset(&zs, 0, sizeof(z_stream));
zs.zalloc = Z_NULL;
zs.zfree = Z_NULL;
zs.opaque = Z_NULL;
if(inflateInit2(&zs, -15) != Z_OK){
fprintf(stderr, "Error initializing deflation!\n");
exit(1);
}
}
int inflate_file(pb_file *pbf, int out_fd, struct zipentry *ze){
Bytef in_buff[RDSZ];
Bytef out_buff[RDSZ];
unsigned int rdamt;
int rtval;
ub4 crc = 0;
zs.avail_in = 0;
crc = crc32(crc, NULL, 0); /* initialize crc */
/* loop until we've consumed all the compressed data */
for(;;){
if(zs.avail_in == 0){
if((rdamt = pb_read(pbf, in_buff, RDSZ)) == 0)
break;
else if((int)rdamt < 0){
perror("read");
exit(1);
}
#ifdef DEBUG
printf("%d bytes read\n", rdamt);
#endif
zs.next_in = in_buff;
zs.avail_in = rdamt;
}
zs.next_out = out_buff;
zs.avail_out = RDSZ;
if((rtval = inflate(&zs, 0)) != Z_OK){
if(rtval == Z_STREAM_END){
#ifdef DEBUG
printf("end of stream\n");
#endif
if(zs.avail_out != RDSZ){
crc = crc32(crc, out_buff, (RDSZ - zs.avail_out));
if(out_fd >= 0)
if(write(out_fd, out_buff, (RDSZ - zs.avail_out)) !=
(int)(RDSZ - zs.avail_out)){
perror("write");
exit(1);
}
}
break;
} else {
fprintf(stderr, "Error inflating file! (%d)\n", rtval);
exit(1);
}
} else {
if(zs.avail_out != RDSZ){
crc = crc32(crc, out_buff, (RDSZ - zs.avail_out));
if(out_fd >= 0)
if(write(out_fd, out_buff, (RDSZ - zs.avail_out)) !=
(int)(RDSZ - zs.avail_out)){
perror("write");
exit(1);
}
zs.next_out = out_buff;
zs.avail_out = RDSZ;
}
}
}
#ifdef DEBUG
printf("done inflating\n");
#endif
#ifdef DEBUG
printf("%d bytes left over\n", zs.avail_in);
#endif
#ifdef DEBUG
printf("CRC is %x\n", crc);
#endif
ze->crc = crc;
pb_push(pbf, zs.next_in, zs.avail_in);
ze->usize = zs.total_out;
inflateReset(&zs);
return 0;
}
/*
Function name: report_str_error
args: val Error code returned from zlib.
purpose: Put out an error message corresponding to error code returned from zlib.
Be suitably cryptic seeing I don't really know exactly what these errors mean.
*/
static void report_str_error(int val) {
switch(val) {
case Z_STREAM_END:
break;
case Z_NEED_DICT:
fprintf(stderr, "Need a dictionary?\n");
exit(1);
case Z_DATA_ERROR:
fprintf(stderr, "Z_DATA_ERROR\n");
exit(1);
case Z_STREAM_ERROR:
fprintf(stderr, "Z_STREAM_ERROR\n");
exit(1);
case Z_MEM_ERROR:
fprintf(stderr, "Z_MEM_ERROR\n");
exit(1);
case Z_BUF_ERROR:
fprintf(stderr, "Z_BUF_ERROR\n");
exit(1);
case Z_OK:
break;
default:
fprintf(stderr, "Unknown behavior from inflate\n");
exit(1);
}
}
/*
Function name: ez_inflate_str
args: pbf Pointer to pushback handle for file.
csize Compressed size of embedded file.
usize Uncompressed size of embedded file.
purpose: Read in and decompress the contents of an embedded file and store it in a
byte array.
returns: Byte array of uncompressed embedded file.
*/
static Bytef *ez_inflate_str(pb_file *pbf, ub4 csize, ub4 usize) {
Bytef *out_buff;
Bytef *in_buff;
unsigned int rdamt;
if((zs.next_in = in_buff = (Bytef *) malloc(csize))) {
if((zs.next_out = out_buff = (Bytef *) malloc(usize + 1))) {
if((rdamt = pb_read(pbf, zs.next_in, csize)) == csize) {
zs.avail_in = csize;
zs.avail_out = usize;
report_str_error(inflate(&zs, 0));
free(in_buff);
inflateReset(&zs);
out_buff[usize] = '\0';
}
else {
fprintf(stderr, "Read failed on input file.\n");
fprintf(stderr, "Tried to read %u but read %u instead.\n", csize, rdamt);
free(in_buff);
free(out_buff);
exit(1);
}
}
else {
fprintf(stderr, "Malloc of out_buff failed.\n");
fprintf(stderr, "Error: %s\n", strerror(errno));
free(in_buff);
exit(1);
}
}
else {
fprintf(stderr, "Malloc of in_buff failed.\n");
fprintf(stderr, "Error: %s\n", strerror(errno));
exit(1);
}
return out_buff;
}
/*
Function name: hrd_inflate_str
args: pbf Pointer to pushback handle for file.
csize Pointer to compressed size of embedded file.
usize Pointer to uncompressed size of embedded file.
purpose: Read and decompress an embedded file into a string. Set csize and usize
accordingly. This function does the reading for us in the case there is not size
information in the header for the embedded file.
returns: Byte array of the contents of the embedded file.
*/
static Bytef *hrd_inflate_str(pb_file *pbf, ub4 *csize, ub4 *usize) {
Bytef *out_buff;
Bytef *tmp;
Bytef in_buff[RDSZ];
unsigned int rdamt;
int i;
int zret;
i = 1;
out_buff = NULL;
zret = Z_OK;
while(zret != Z_STREAM_END && (rdamt = pb_read(pbf, in_buff, RDSZ)))
{
zs.avail_in = rdamt;
zs.avail_out = 0;
zs.next_in = in_buff;
do {
if((tmp = (Bytef *) realloc(out_buff, (RDSZ * i) + 1))) {
out_buff = tmp;
zs.next_out = &(out_buff[(RDSZ * (i - 1)) - zs.avail_out]);
zs.avail_out += RDSZ;
i++;
}
else {
fprintf(stderr, "Realloc of out_buff failed.\n");
fprintf(stderr, "Error: %s\n", strerror(errno));
exit(1);
}
} while((zret = inflate(&zs, 0)) == Z_OK);
report_str_error(zret);
}
pb_push(pbf, zs.next_in, zs.avail_in);
out_buff[(RDSZ * (i - 1)) - zs.avail_out] = '\0';
*usize = zs.total_out;
*csize = zs.total_in;
inflateReset(&zs);
return out_buff;
}
/*
Function name: inflate_string
args: pbf Pointer to pushback handle for file.
csize Pointer to compressed size of embedded file. May be 0 if not set.
usize Pointer to uncompressed size of embedded file. May be 0 if not set.
purpose: Decide the easiest (in computer terms) methos of decompressing this embedded
file to a string.
returns: Pointer to a string containing the decompressed contents of the embedded file.
If csize and usize are not set set them to correct numbers.
*/
Bytef *inflate_string(pb_file *pbf, ub4 *csize, ub4 *usize) {
Bytef *ret_buf;
if(*csize && *usize) ret_buf = ez_inflate_str(pbf, *csize, *usize);
else ret_buf = hrd_inflate_str(pbf, csize, usize);
return ret_buf;
}
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