emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

New common unarchive code.

Browse Source
This commit is contained in:
Glenn L McGrath
2002-09-25 02:47:48 +00:00
parent ecfa290cfd
commit 7ca04f328e
36 changed files with 2436 additions and 1914 deletions
Download Patch File Download Diff File Expand all files Collapse all files

113
archival/libunarchive/get_header_tar.c
View File

@@ -20,8 +20,9 @@
#include "unarchive.h"
#include "libbb.h"
file_header_t *get_header_tar(FILE * tar_stream)
extern char get_header_tar(archive_handle_t *archive_handle)
{
file_header_t *file_header = archive_handle->file_header;
union {
unsigned char raw[512];
struct {
@@ -44,20 +45,22 @@ file_header_t *get_header_tar(FILE * tar_stream)
char padding[12]; /* 500-512 */
} formated;
} tar;
file_header_t *tar_entry = NULL;
long sum = 0;
long i;
if (archive_offset % 512 != 0) {
seek_sub_file(tar_stream, 512 - (archive_offset % 512));
}
/* Align header */
archive_handle->offset += data_align(archive_handle->src_fd, archive_handle->offset, 512);
if (fread(tar.raw, 1, 512, tar_stream) != 512) {
/* Unfortunatly its common for tar files to have all sorts of
* trailing garbage, fail silently */
return (NULL);
if (xread_all_eof(archive_handle->src_fd, tar.raw, 512) == 0) {
/* End of file */
return(EXIT_FAILURE);
}
archive_handle->offset += 512;
/* If there is no filename its an empty header */
if (tar.formated.name[0] == 0) {
return(EXIT_SUCCESS);
}
archive_offset += 512;
/* Check header has valid magic, "ustar" is for the proper tar
* 0's are for the old tar format
@@ -66,100 +69,102 @@ file_header_t *get_header_tar(FILE * tar_stream)
#ifdef CONFIG_FEATURE_TAR_OLD_FORMAT
if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0)
#endif
return (NULL);
}
/* If there is no filename its an empty header, skip it */
if (tar.formated.name[0] == 0) {
return (NULL);
error_msg_and_die("Invalid tar magic");
}
/* Do checksum on headers */
for (i = 0; i < 148; i++) {
for (i = 0; i < 148 ; i++) {
sum += tar.raw[i];
}
sum += ' ' * 8;
for (i = 156; i < 512; i++) {
for (i = 156; i < 512 ; i++) {
sum += tar.raw[i];
}
if (sum != strtol(tar.formated.chksum, NULL, 8)) {
error_msg("Invalid tar header checksum");
return (NULL);
return(EXIT_FAILURE);
}
/* convert to type'ed variables */
tar_entry = xcalloc(1, sizeof(file_header_t));
if (tar.formated.prefix[0] == 0) {
tar_entry->name = xstrdup(tar.formated.name);
file_header->name = strdup(tar.formated.name);
} else {
tar_entry->name =
concat_path_file(tar.formated.prefix, tar.formated.name);
file_header->name = concat_path_file(tar.formated.prefix, tar.formated.name);
}
tar_entry->mode = strtol(tar.formated.mode, NULL, 8);
tar_entry->uid = strtol(tar.formated.uid, NULL, 8);
tar_entry->gid = strtol(tar.formated.gid, NULL, 8);
tar_entry->size = strtol(tar.formated.size, NULL, 8);
tar_entry->mtime = strtol(tar.formated.mtime, NULL, 8);
tar_entry->link_name =
strlen(tar.formated.linkname) ? xstrdup(tar.formated.linkname) : NULL;
tar_entry->device =
(dev_t) ((strtol(tar.formated.devmajor, NULL, 8) << 8) +
file_header->mode = strtol(tar.formated.mode, NULL, 8);
file_header->uid = strtol(tar.formated.uid, NULL, 8);
file_header->gid = strtol(tar.formated.gid, NULL, 8);
file_header->size = strtol(tar.formated.size, NULL, 8);
file_header->mtime = strtol(tar.formated.mtime, NULL, 8);
file_header->link_name = (tar.formated.linkname[0] != '\0') ?
xstrdup(tar.formated.linkname) : NULL;
file_header->device = (dev_t) ((strtol(tar.formated.devmajor, NULL, 8) << 8) +
strtol(tar.formated.devminor, NULL, 8));
#if defined CONFIG_FEATURE_TAR_OLD_FORMAT || defined CONFIG_FEATURE_GNUTAR_LONG_FILENAME
/* Fix mode, used by the old format */
switch (tar.formated.typeflag) {
# ifdef CONFIG_FEATURE_TAR_OLD_FORMAT
case 0:
tar_entry->mode |= S_IFREG;
file_header->mode |= S_IFREG;
break;
case 1:
error_msg("internal hard link not handled\n");
error_msg("Internal hard link not supported");
break;
case 2:
tar_entry->mode |= S_IFLNK;
file_header->mode |= S_IFLNK;
break;
case 3:
tar_entry->mode |= S_IFCHR;
file_header->mode |= S_IFCHR;
break;
case 4:
tar_entry->mode |= S_IFBLK;
file_header->mode |= S_IFBLK;
break;
case 5:
tar_entry->mode |= S_IFDIR;
file_header->mode |= S_IFDIR;
break;
case 6:
tar_entry->mode |= S_IFIFO;
file_header->mode |= S_IFIFO;
break;
# endif
# ifdef CONFIG_FEATURE_GNUTAR_LONG_FILENAME
case 'L': {
char *longname;
longname = xmalloc(tar_entry->size + 1);
fread(longname, 1, tar_entry->size, tar_stream);
archive_offset += tar_entry->size;
longname[tar_entry->size] = '\0';
longname = xmalloc(file_header->size + 1);
xread_all(archive_handle->src_fd, longname, file_header->size);
longname[file_header->size] = '\0';
archive_handle->offset += file_header->size;
tar_entry = get_header_tar(tar_stream);
tar_entry->name = longname;
get_header_tar(archive_handle);
file_header->name = longname;
break;
}
case 'K': {
char *longname;
char *linkname;
longname = xmalloc(tar_entry->size + 1);
fread(longname, 1, tar_entry->size, tar_stream);
archive_offset += tar_entry->size;
longname[tar_entry->size] = '\0';
linkname = xmalloc(file_header->size + 1);
xread_all(archive_handle->src_fd, linkname, file_header->size);
linkname[file_header->size] = '\0';
archive_handle->offset += file_header->size;
tar_entry = get_header_tar(tar_stream);
tar_entry->link_name = longname;
get_header_tar(archive_handle);
file_header->name = linkname;
break;
}
# endif
}
#endif
return (tar_entry);
if (archive_handle->filter(archive_handle->accept, archive_handle->reject, archive_handle->file_header->name) == EXIT_SUCCESS) {
archive_handle->action_header(archive_handle->file_header);
archive_handle->flags |= ARCHIVE_EXTRACT_QUIET;
archive_handle->action_data(archive_handle);
} else {
data_skip(archive_handle);
}
archive_handle->offset += file_header->size;
return(EXIT_SUCCESS);
}