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d6772501db
(GNU extensions 'K' and 'L'). We correctly handle them when untarring now, but unfortunately we still don't use them when tarring! That stupid 100 char limit is still there! The biggest problem is that we don't support 'pax' tar format. Linux kernel tarballs are in this format... shame
113 lines
3.6 KiB
C
113 lines
3.6 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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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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#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;
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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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}
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typed->mode = xstrtoul(ar.formatted.mode, 8);
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typed->mtime = xatou(ar.formatted.date);
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typed->uid = xatou(ar.formatted.uid);
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typed->gid = xatou(ar.formatted.gid);
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typed->size = xatoul(ar.formatted.size);
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/* long filenames have '/' as the first character */
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if (ar.formatted.name[0] == '/') {
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#ifdef CONFIG_FEATURE_AR_LONG_FILENAMES
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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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} else 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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} else {
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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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const unsigned int 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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}
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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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} 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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