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Fix tar -j support

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Use the old fork() method of tar compression support, rather than
read_bz2....
 - (*uncompress)(int in, int out) seems like a more natural interface
for compression code.
 - it might improve performance by seperating the work into one cpu
bound and one io bound process.
 - There is extra code required to do read_[gz|bunzip] since (*uncompress)(int in,
int out) will normally be used by the standalone compression applet.

There have been problems with this method so if you see a "Short read"
error let me know.
This commit is contained in:
Glenn L McGrath 2003-11-05 04:55:58 +00:00
parent 6d687817a8
commit 2685724e23
3 changed files with 43 additions and 23 deletions
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16
archival/libunarchive/decompress_bunzip2.c
View File

@ -590,22 +590,6 @@ extern int uncompressStream(int src_fd, int dst_fd)
return i;
}
/* This new version is not yet properly integrated with tar */
extern ssize_t read_bz2(int fd, void *buf, size_t count)
{
#warning FIXME "bzip2 tar support is broken!"
return(0);
}
extern void BZ2_bzReadOpen(int fd, void *unused, int nUnused)
{
#warning FIXME "bzip2 tar support is broken!"
}
extern void BZ2_bzReadClose(void)
{
#warning FIXME "bzip2 tar support is broken!"
}
#ifdef TESTING
static char * const bunzip_errors[]={NULL,"Bad file checksum","Not bzip data",

2
archival/libunarchive/get_header_tar.c
View File

@ -65,7 +65,7 @@ extern char get_header_tar(archive_handle_t *archive_handle)
/* If there is no filename its an empty header */
if (tar.formated.name[0] == 0) {
return(EXIT_SUCCESS);
return(EXIT_FAILURE);
}
/* Check header has valid magic, "ustar" is for the proper tar

48
archival/libunarchive/get_header_tar_bz2.c
View File

@ -15,6 +15,7 @@
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
@ -25,18 +26,53 @@
extern char get_header_tar_bz2(archive_handle_t *archive_handle)
{
BZ2_bzReadOpen(archive_handle->src_fd, NULL, 0);
int fd_pipe[2];
int pid;
archive_handle->read = read_bz2;
/* Cant lseek over pipe's */
archive_handle->read = safe_read;
archive_handle->seek = seek_by_char;
if (pipe(fd_pipe) != 0) {
bb_error_msg_and_die("Can't create pipe");
}
pid = fork();
if (pid == -1) {
bb_error_msg_and_die("Fork failed\n");
}
if (pid == 0) {
/* child process */
close(fd_pipe[0]); /* We don't wan't to read from the pipe */
uncompressStream(archive_handle->src_fd, fd_pipe[1]);
check_trailer_gzip(archive_handle->src_fd);
close(fd_pipe[1]); /* Send EOF */
exit(0);
/* notreached */
}
/* parent process */
close(fd_pipe[1]); /* Don't want to write down the pipe */
close(archive_handle->src_fd);
archive_handle->src_fd = fd_pipe[0];
archive_handle->offset = 0;
while (get_header_tar(archive_handle) == EXIT_SUCCESS);
/* Cleanup */
BZ2_bzReadClose();
close(fd_pipe[0]);
printf("finished\n");
#if 0
if (kill(pid, SIGTERM) == -1) {
bb_error_msg_and_die("Couldnt kill gunzip process");
}
#endif
/* Can only do one tar.bz2 per archive */
/* I dont think this is needed */
if (waitpid(pid, NULL, 0) == -1) {
bb_error_msg("Couldnt wait ?");
}
/* Can only do one file at a time */
return(EXIT_FAILURE);
}