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authorGlenn L McGrath2002-09-25 02:47:48 +0000
committerGlenn L McGrath2002-09-25 02:47:48 +0000
commit7ca04f328e22fcbee4659d73f9a72dfdf1dd6a23 (patch)
treef38c7ef4317eea28c6abdb0adbbb286fe041711e /archival/libunarchive/get_header_ar.c
parentecfa290cfd4953598e6d91989bd66ac16e135f84 (diff)
downloadbusybox-7ca04f328e22fcbee4659d73f9a72dfdf1dd6a23.zip
busybox-7ca04f328e22fcbee4659d73f9a72dfdf1dd6a23.tar.gz
New common unarchive code.
Diffstat (limited to 'archival/libunarchive/get_header_ar.c')
-rw-r--r--archival/libunarchive/get_header_ar.c96
1 files changed, 56 insertions, 40 deletions
diff --git a/archival/libunarchive/get_header_ar.c b/archival/libunarchive/get_header_ar.c
index f172fa7..b7f2cfb 100644
--- a/archival/libunarchive/get_header_ar.c
+++ b/archival/libunarchive/get_header_ar.c
@@ -17,12 +17,13 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <unistd.h>
#include "unarchive.h"
#include "libbb.h"
-file_header_t *get_header_ar(FILE *src_stream)
+extern char get_header_ar(archive_handle_t *archive_handle)
{
- file_header_t *typed;
+ file_header_t *typed = archive_handle->file_header;
union {
char raw[60];
struct {
@@ -35,72 +36,87 @@ file_header_t *get_header_ar(FILE *src_stream)
char magic[2];
} formated;
} ar;
+#ifdef CONFIG_FEATURE_AR_LONG_FILENAMES
static char *ar_long_names;
+ static unsigned int ar_long_name_size;
+#endif
- if (fread(ar.raw, 1, 60, src_stream) != 60) {
- return(NULL);
- }
- archive_offset += 60;
- /* align the headers based on the header magic */
- if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) {
- /* some version of ar, have an extra '\n' after each data entry,
- * this puts the next header out by 1 */
- if (ar.formated.magic[1] != '`') {
- error_msg("Invalid magic");
- return(NULL);
- }
- /* read the next char out of what would be the data section,
- * if its a '\n' then it is a valid header offset by 1*/
- archive_offset++;
- if (fgetc(src_stream) != '\n') {
- error_msg("Invalid magic");
- return(NULL);
+ /* dont use xread as we want to handle the error ourself */
+ if (read(archive_handle->src_fd, ar.raw, 60) != 60) {
+ /* End Of File */
+ return(EXIT_FAILURE);
}
+
+ /* Some ar entries have a trailing '\n' after the previous data entry */
+ if (ar.raw[0] == '\n') {
/* fix up the header, we started reading 1 byte too early */
- /* raw_header[60] wont be '\n' as it should, but it doesnt matter */
memmove(ar.raw, &ar.raw[1], 59);
+ ar.raw[59] = xread_char(archive_handle->src_fd);
+ archive_handle->offset++;
}
+ archive_handle->offset += 60;
- typed = (file_header_t *) xcalloc(1, sizeof(file_header_t));
+ /* align the headers based on the header magic */
+ if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) {
+ error_msg_and_die("Invalid ar header");
+ }
+
+ typed->mode = strtol(ar.formated.mode, NULL, 8);
+ typed->mtime = atoi(ar.formated.date);
+ typed->uid = atoi(ar.formated.uid);
+ typed->gid = atoi(ar.formated.gid);
+ typed->size = atoi(ar.formated.size);
- typed->size = (size_t) atoi(ar.formated.size);
/* long filenames have '/' as the first character */
if (ar.formated.name[0] == '/') {
+#ifdef CONFIG_FEATURE_AR_LONG_FILENAMES
if (ar.formated.name[1] == '/') {
/* If the second char is a '/' then this entries data section
* stores long filename for multiple entries, they are stored
* in static variable long_names for use in future entries */
- ar_long_names = (char *) xrealloc(ar_long_names, typed->size);
- fread(ar_long_names, 1, typed->size, src_stream);
- archive_offset += typed->size;
+ ar_long_name_size = typed->size;
+ ar_long_names = xmalloc(ar_long_name_size);
+ xread_all(archive_handle->src_fd, ar_long_names, ar_long_name_size);
+ archive_handle->offset += ar_long_name_size;
/* This ar entries data section only contained filenames for other records
* they are stored in the static ar_long_names for future reference */
- return (get_header_ar(src_stream)); /* Return next header */
+ return (get_header_ar(archive_handle)); /* Return next header */
} else if (ar.formated.name[1] == ' ') {
/* This is the index of symbols in the file for compilers */
- seek_sub_file(src_stream, typed->size);
- return (get_header_ar(src_stream)); /* Return next header */
+ data_skip(archive_handle);
+ return (get_header_ar(archive_handle)); /* Return next header */
} else {
/* The number after the '/' indicates the offset in the ar data section
(saved in variable long_name) that conatains the real filename */
- if (!ar_long_names) {
- error_msg("Cannot resolve long file name");
- return (NULL);
+ const unsigned int long_offset = atoi(&ar.formated.name[1]);
+ if (long_offset >= ar_long_name_size) {
+ error_msg_and_die("Cant resolve long filename");
}
- typed->name = xstrdup(ar_long_names + atoi(&ar.formated.name[1]));
+ typed->name = xstrdup(ar_long_names + long_offset);
}
+#else
+ error_msg_and_die("long filenames not supported");
+#endif
} else {
/* short filenames */
typed->name = xstrndup(ar.formated.name, 16);
}
- typed->name[strcspn(typed->name, " /")]='\0';
- /* convert the rest of the now valid char header to its typed struct */
- parse_mode(ar.formated.mode, &typed->mode);
- typed->mtime = atoi(ar.formated.date);
- typed->uid = atoi(ar.formated.uid);
- typed->gid = atoi(ar.formated.gid);
+ typed->name[strcspn(typed->name, " /")] = '\0';
+
+ if (archive_handle->filter(archive_handle->accept, archive_handle->reject, typed->name) == EXIT_SUCCESS) {
+ archive_handle->action_header(typed);
+ if (archive_handle->sub_archive) {
+ while (archive_handle->action_data_subarchive(archive_handle->sub_archive) == EXIT_SUCCESS);
+ } else {
+ archive_handle->action_data(archive_handle);
+ }
+ } else {
+ data_skip(archive_handle);
+ }
+
+ archive_handle->offset += typed->size + 1;
- return(typed);
+ return(EXIT_SUCCESS);
}