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/*
* Guillaume Cottenceau (gc@mandrakesoft.com)
*
* Copyright 2000 MandrakeSoft
*
* This software may be freely redistributed under the terms of the GNU
* public license.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* mar - The Mandrake Archiver
*
* An archiver that supports compression (through zlib).
*
*/
/*
* This code should suffice for stage1 on-the-fly uncompression of kernel modules.
* (and it DOES perform tests and return values, blaaaah..)
*/
#include "mar-extract-only.h"
#include "mar.h"
#ifdef _STANDALONE_
void
zerr(BZFILE * f) /* decrease code size */
{
fprintf(stderr, BZ2_bzerror(f, &z_errnum));
}
inline void
log_perror(char *msg)
{
perror(msg);
}
void
log_message(char *msg)
{
fprintf(stderr, msg);
}
#else /* _STANDALONE_ */
#include "../log.h"
void
zerr(BZFILE * f) /* decrease code size */
{
log_message(BZ2_bzerror(f, &z_errnum));
}
#endif /* _STANDALONE_ */
static int
mar_open_file(char *filename, struct mar_stream *s)
{
int end_filetable = 0;
struct mar_element * previous_element = NULL;
/* mar_zfile */
s->mar_zfile = BZ2_bzopen(filename, "rb");
if (!s->mar_zfile)
{
log_perror(filename);
return -1;
}
while (end_filetable == 0)
{
char buf[512];
int ptr = 0;
/* read filename */
do
{
if (BZ2_bzread(s->mar_zfile, &(buf[ptr]), sizeof(char)) != sizeof(char))
{
zerr(s->mar_zfile);
return -1;
}
ptr++;
} while ((buf[ptr-1] != 0) && (ptr < 512));
/* ptr == 1 when we arrive on the "char 0" of the end of the filetable */
if (ptr > 1)
{
struct mar_element * e = (struct mar_element *) malloc(sizeof(struct mar_element));
e->filename = strdup(buf);
/* read file_length */
if (BZ2_bzread(s->mar_zfile, &(e->file_length), sizeof(int)) != sizeof(int))
{
zerr(s->mar_zfile);
return -1;
}
/* read data_offset */
if (BZ2_bzread(s->mar_zfile, &(e->data_offset), sizeof(int)) != sizeof(int))
{
zerr(s->mar_zfile);
return -1;
}
/* write down chaining */
if (previous_element)
previous_element->next_element = e;
else
s->first_element = e;
previous_element = e;
}
else
end_filetable = 1;
}
/* chaining for last element */
previous_element->next_element = NULL;
return 0;
}
char **
mar_list_contents(char * mar_filename)
{
struct mar_stream s;
struct mar_element * elem;
char * tmp_contents[500];
char ** answ;
int i = 0;
if (mar_open_file(mar_filename, &s))
return NULL;
elem = s.first_element;
while (elem)
{
tmp_contents[i++] = strdup(elem->filename);
elem = elem->next_element;
}
tmp_contents[i++] = NULL;
answ = (char **) malloc(sizeof(char *) * i);
memcpy(answ, tmp_contents, sizeof(char *) * i);
return answ;
}
int
mar_extract_file(char *mar_filename, char *filename_to_extract, char *dest_dir)
{
struct mar_stream s;
struct mar_element * elem;
if (mar_open_file(mar_filename, &s))
return -1;
elem = s.first_element;
while (elem)
{
if (strcmp(elem->filename, filename_to_extract) == 0)
{
char garb_buf[4096];
char *buf;
char *dest_file;
int fd, i;
dest_file = (char *) alloca(strlen(dest_dir) + strlen(filename_to_extract) + 1);
strcpy(dest_file, dest_dir);
strcat(dest_file, filename_to_extract);
fd = creat(dest_file, 00660);
if (fd == -1)
{
log_perror(dest_file);
return -1;
}
buf = (char *) alloca(elem->file_length);
if (!buf)
{
log_perror(dest_file);
return -1;
}
i = elem->data_offset;
while (i > 0) {
int to_read = i > sizeof(garb_buf) ? sizeof(garb_buf) : i;
if (BZ2_bzread(s.mar_zfile, garb_buf, to_read) != to_read) {
log_message("MAR: unexpected EOF in stream");
return -1;
}
i -= to_read;
}
if (BZ2_bzread(s.mar_zfile, buf, elem->file_length) != elem->file_length)
{
zerr(s.mar_zfile);
return -1;
}
if (write(fd, buf, elem->file_length) != elem->file_length)
{
log_perror(dest_file);
return -1;
}
close(fd); /* do not check return value for code size */
BZ2_bzclose(s.mar_zfile);
return 0;
}
elem = elem->next_element;
}
BZ2_bzclose(s.mar_zfile);
return 1; /* 1 for file_not_found_in_archive */
}
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