127 lines
4.1 KiB
C
127 lines
4.1 KiB
C
/* vi: set sw=4 ts=4: */
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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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*/
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#include "libbb.h"
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#include "unarchive.h"
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char get_header_ar(archive_handle_t *archive_handle)
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{
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int err;
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file_header_t *typed = archive_handle->file_header;
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union {
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char raw[60];
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struct {
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char name[16];
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char date[12];
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char uid[6];
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char gid[6];
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char mode[8];
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char size[10];
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char magic[2];
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} formatted;
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} ar;
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#if ENABLE_FEATURE_AR_LONG_FILENAMES
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static char *ar_long_names;
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static unsigned ar_long_name_size;
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#endif
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/* dont use xread as we want to handle the error ourself */
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if (read(archive_handle->src_fd, ar.raw, 60) != 60) {
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/* End Of File */
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return EXIT_FAILURE;
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}
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/* ar header starts on an even byte (2 byte aligned)
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* '\n' is used for padding
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*/
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if (ar.raw[0] == '\n') {
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/* fix up the header, we started reading 1 byte too early */
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memmove(ar.raw, &ar.raw[1], 59);
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ar.raw[59] = 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 */
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if (ar.formatted.magic[0] != '`' || ar.formatted.magic[1] != '\n')
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bb_error_msg_and_die("invalid ar header");
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/* FIXME: more thorough routine would be in order here */
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/* (we have something like that in tar) */
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/* but for now we are lax. This code works because */
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/* on misformatted numbers bb_strtou returns all-ones */
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typed->mode = err = bb_strtou(ar.formatted.mode, NULL, 8);
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if (err == -1) bb_error_msg_and_die("invalid ar header");
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typed->mtime = err = bb_strtou(ar.formatted.date, NULL, 10);
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if (err == -1) bb_error_msg_and_die("invalid ar header");
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typed->uid = err = bb_strtou(ar.formatted.uid, NULL, 10);
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if (err == -1) bb_error_msg_and_die("invalid ar header");
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typed->gid = err = bb_strtou(ar.formatted.gid, NULL, 10);
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if (err == -1) bb_error_msg_and_die("invalid ar header");
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typed->size = err = bb_strtou(ar.formatted.size, NULL, 10);
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if (err == -1) bb_error_msg_and_die("invalid ar header");
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/* long filenames have '/' as the first character */
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if (ar.formatted.name[0] == '/') {
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#if ENABLE_FEATURE_AR_LONG_FILENAMES
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unsigned long_offset;
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if (ar.formatted.name[1] == '/') {
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/* If the second char is a '/' then this entries data section
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* stores long filename for multiple entries, they are stored
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* in static variable long_names for use in future entries */
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ar_long_name_size = typed->size;
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ar_long_names = xmalloc(ar_long_name_size);
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xread(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
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* 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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}
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if (ar.formatted.name[1] == ' ') {
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/* This is the index of symbols in the file for compilers */
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data_skip(archive_handle);
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archive_handle->offset += typed->size;
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return get_header_ar(archive_handle); /* Return next header */
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}
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/* The number after the '/' indicates the offset in the ar data section
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* (saved in variable long_name) that conatains the real filename */
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long_offset = atoi(&ar.formatted.name[1]);
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if (long_offset >= ar_long_name_size) {
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bb_error_msg_and_die("can't resolve long filename");
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}
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typed->name = xstrdup(ar_long_names + long_offset);
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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 {
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/* short filenames */
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typed->name = xstrndup(ar.formatted.name, 16);
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}
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typed->name[strcspn(typed->name, " /")] = '\0';
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if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
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archive_handle->action_header(typed);
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if (archive_handle->sub_archive) {
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while (archive_handle->action_data_subarchive(archive_handle->sub_archive) == EXIT_SUCCESS)
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/* repeat */;
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} else {
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archive_handle->action_data(archive_handle);
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}
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} else {
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data_skip(archive_handle);
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}
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archive_handle->offset += typed->size;
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/* Set the file pointer to the correct spot, we may have been reading a compressed file */
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lseek(archive_handle->src_fd, archive_handle->offset, SEEK_SET);
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return EXIT_SUCCESS;
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}
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