busybox/archival/libunarchive/get_header_ar.c

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/* Copyright 2001 Glenn McGrath.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <unistd.h>
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#include "unarchive.h"
#include "libbb.h"
char get_header_ar(archive_handle_t *archive_handle)
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{
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file_header_t *typed = archive_handle->file_header;
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union {
char raw[60];
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struct {
char name[16];
char date[12];
char uid[6];
char gid[6];
char mode[8];
char size[10];
char magic[2];
} formated;
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} ar;
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#ifdef CONFIG_FEATURE_AR_LONG_FILENAMES
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static char *ar_long_names;
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static unsigned int ar_long_name_size;
#endif
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/* dont use bb_xread as we want to handle the error ourself */
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if (read(archive_handle->src_fd, ar.raw, 60) != 60) {
/* End Of File */
return(EXIT_FAILURE);
}
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/* ar header starts on an even byte (2 byte aligned)
* '\n' is used for padding
*/
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if (ar.raw[0] == '\n') {
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/* fix up the header, we started reading 1 byte too early */
memmove(ar.raw, &ar.raw[1], 59);
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ar.raw[59] = bb_xread_char(archive_handle->src_fd);
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archive_handle->offset++;
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}
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archive_handle->offset += 60;
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/* align the headers based on the header magic */
if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) {
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bb_error_msg_and_die("Invalid ar header");
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}
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);
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/* long filenames have '/' as the first character */
if (ar.formated.name[0] == '/') {
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#ifdef CONFIG_FEATURE_AR_LONG_FILENAMES
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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 */
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ar_long_name_size = typed->size;
ar_long_names = xmalloc(ar_long_name_size);
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bb_xread_all(archive_handle->src_fd, ar_long_names, ar_long_name_size);
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archive_handle->offset += ar_long_name_size;
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/* This ar entries data section only contained filenames for other records
* they are stored in the static ar_long_names for future reference */
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return (get_header_ar(archive_handle)); /* Return next header */
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} else if (ar.formated.name[1] == ' ') {
/* This is the index of symbols in the file for compilers */
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data_skip(archive_handle);
archive_handle->offset += typed->size;
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return (get_header_ar(archive_handle)); /* Return next header */
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} else {
/* The number after the '/' indicates the offset in the ar data section
(saved in variable long_name) that conatains the real filename */
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const unsigned int long_offset = atoi(&ar.formated.name[1]);
if (long_offset >= ar_long_name_size) {
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bb_error_msg_and_die("Cant resolve long filename");
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}
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typed->name = bb_xstrdup(ar_long_names + long_offset);
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}
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#else
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bb_error_msg_and_die("long filenames not supported");
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#endif
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} else {
/* short filenames */
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typed->name = bb_xstrndup(ar.formated.name, 16);
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}
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typed->name[strcspn(typed->name, " /")] = '\0';
if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
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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);
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}
archive_handle->offset += typed->size;
/* Set the file pointer to the correct spot, we may have been reading a compressed file */
lseek(archive_handle->src_fd, archive_handle->offset, SEEK_SET);
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return(EXIT_SUCCESS);
}