busybox/archival/libunarchive/get_header_ar.c

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/* 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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*/
#include "libbb.h"
#include "unarchive.h"
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static unsigned read_num(const char *str, int base)
{
/* This code works because
* on misformatted numbers bb_strtou returns all-ones */
int err = bb_strtou(str, NULL, base);
if (err == -1)
bb_error_msg_and_die("invalid ar header");
return err;
}
char FAST_FUNC get_header_ar(archive_handle_t *archive_handle)
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{
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file_header_t *typed = archive_handle->file_header;
unsigned size;
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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];
} formatted;
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} ar;
#if ENABLE_FEATURE_AR_LONG_FILENAMES
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static char *ar_long_names;
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) {
/* 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);
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
* (we have something like that in tar)
* but for now we are lax. */
typed->size = size = read_num(ar.formatted.size, 10);
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/* special filenames have '/' as the first character */
if (ar.formatted.name[0] == '/') {
if (ar.formatted.name[1] == ' ') {
/* This is the index of symbols in the file for compilers */
data_skip(archive_handle);
archive_handle->offset += size;
return get_header_ar(archive_handle); /* Return next header */
}
#if ENABLE_FEATURE_AR_LONG_FILENAMES
if (ar.formatted.name[1] == '/') {
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/* 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_name_size = size;
free(ar_long_names);
ar_long_names = xmalloc(size);
xread(archive_handle->src_fd, ar_long_names, size);
archive_handle->offset += size;
/* Return next header */
return get_header_ar(archive_handle);
}
#else
bb_error_msg_and_die("long filenames not supported");
#endif
}
/* Only size is always present, the rest may be missing in
* long filename pseudo file. Thus we decode the rest
* after dealing with long filename pseudo file.
*/
typed->mode = read_num(ar.formatted.mode, 8);
typed->mtime = read_num(ar.formatted.date, 10);
typed->uid = read_num(ar.formatted.uid, 10);
typed->gid = read_num(ar.formatted.gid, 10);
#if ENABLE_FEATURE_AR_LONG_FILENAMES
if (ar.formatted.name[0] == '/') {
unsigned long_offset;
/* The number after the '/' indicates the offset in the ar data section
* (saved in ar_long_names) that conatains the real filename */
long_offset = read_num(&ar.formatted.name[1], 10);
if (long_offset >= ar_long_name_size) {
bb_error_msg_and_die("can't resolve long filename");
}
typed->name = xstrdup(ar_long_names + long_offset);
} else
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#endif
{
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/* short filenames */
typed->name = xstrndup(ar.formatted.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 ENABLE_DPKG || ENABLE_DPKG_DEB
if (archive_handle->dpkg__sub_archive) {
while (archive_handle->dpkg__action_data_subarchive(archive_handle->dpkg__sub_archive) == EXIT_SUCCESS)
continue;
} else
#endif
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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;
}