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New common unarchive code.

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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
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98
archival/libunarchive/get_header_ar.c
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@@ -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);
/* 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 */
memmove(ar.raw, &ar.raw[1], 59);
ar.raw[59] = xread_char(archive_handle->src_fd);
archive_handle->offset++;
}
archive_offset += 60;
archive_handle->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);
}
/* 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);
error_msg_and_die("Invalid ar header");
}
typed = (file_header_t *) xcalloc(1, sizeof(file_header_t));
typed->size = (size_t) atoi(ar.formated.size);
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);
/* 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';
return(typed);
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(EXIT_SUCCESS);
}