rename archival/libunarchive -> archival/libarchive; move bz/ into it
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
186
archival/libarchive/get_header_cpio.c
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186
archival/libarchive/get_header_cpio.c
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@ -0,0 +1,186 @@
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/* vi: set sw=4 ts=4: */
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/* Copyright 2002 Laurence Anderson
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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#include "archive.h"
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typedef struct hardlinks_t {
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struct hardlinks_t *next;
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int inode; /* TODO: must match maj/min too! */
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int mode ;
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int mtime; /* These three are useful only in corner case */
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int uid ; /* of hardlinks with zero size body */
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int gid ;
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char name[1];
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} hardlinks_t;
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char FAST_FUNC get_header_cpio(archive_handle_t *archive_handle)
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{
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file_header_t *file_header = archive_handle->file_header;
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char cpio_header[110];
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int namesize;
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int major, minor, nlink, mode, inode;
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unsigned size, uid, gid, mtime;
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/* There can be padding before archive header */
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data_align(archive_handle, 4);
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size = full_read(archive_handle->src_fd, cpio_header, 110);
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if (size == 0) {
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goto create_hardlinks;
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}
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if (size != 110) {
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bb_error_msg_and_die("short read");
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}
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archive_handle->offset += 110;
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if (strncmp(&cpio_header[0], "07070", 5) != 0
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|| (cpio_header[5] != '1' && cpio_header[5] != '2')
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) {
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bb_error_msg_and_die("unsupported cpio format, use newc or crc");
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}
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if (sscanf(cpio_header + 6,
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"%8x" "%8x" "%8x" "%8x"
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"%8x" "%8x" "%8x" /*maj,min:*/ "%*16c"
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/*rmaj,rmin:*/"%8x" "%8x" "%8x" /*chksum: "%*8c"*/,
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&inode, &mode, &uid, &gid,
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&nlink, &mtime, &size,
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&major, &minor, &namesize) != 10)
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bb_error_msg_and_die("damaged cpio file");
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file_header->mode = mode;
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file_header->uid = uid;
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file_header->gid = gid;
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file_header->mtime = mtime;
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file_header->size = size;
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namesize &= 0x1fff; /* paranoia: limit names to 8k chars */
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file_header->name = xzalloc(namesize + 1);
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/* Read in filename */
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xread(archive_handle->src_fd, file_header->name, namesize);
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if (file_header->name[0] == '/') {
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/* Testcase: echo /etc/hosts | cpio -pvd /tmp
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* Without this code, it tries to unpack /etc/hosts
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* into "/etc/hosts", not "etc/hosts".
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*/
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char *p = file_header->name;
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do p++; while (*p == '/');
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overlapping_strcpy(file_header->name, p);
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}
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archive_handle->offset += namesize;
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/* Update offset amount and skip padding before file contents */
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data_align(archive_handle, 4);
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if (strcmp(file_header->name, "TRAILER!!!") == 0) {
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/* Always round up. ">> 9" divides by 512 */
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archive_handle->cpio__blocks = (uoff_t)(archive_handle->offset + 511) >> 9;
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goto create_hardlinks;
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}
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file_header->link_target = NULL;
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if (S_ISLNK(file_header->mode)) {
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file_header->size &= 0x1fff; /* paranoia: limit names to 8k chars */
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file_header->link_target = xzalloc(file_header->size + 1);
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xread(archive_handle->src_fd, file_header->link_target, file_header->size);
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archive_handle->offset += file_header->size;
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file_header->size = 0; /* Stop possible seeks in future */
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}
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// TODO: data_extract_all can't deal with hardlinks to non-files...
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// when fixed, change S_ISREG to !S_ISDIR here
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if (nlink > 1 && S_ISREG(file_header->mode)) {
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hardlinks_t *new = xmalloc(sizeof(*new) + namesize);
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new->inode = inode;
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new->mode = mode ;
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new->mtime = mtime;
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new->uid = uid ;
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new->gid = gid ;
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strcpy(new->name, file_header->name);
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/* Put file on a linked list for later */
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if (size == 0) {
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new->next = archive_handle->cpio__hardlinks_to_create;
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archive_handle->cpio__hardlinks_to_create = new;
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return EXIT_SUCCESS; /* Skip this one */
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/* TODO: this breaks cpio -t (it does not show hardlinks) */
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}
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new->next = archive_handle->cpio__created_hardlinks;
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archive_handle->cpio__created_hardlinks = new;
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}
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file_header->device = makedev(major, minor);
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if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
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archive_handle->action_data(archive_handle);
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//TODO: run "echo /etc/hosts | cpio -pv /tmp" twice. On 2nd run:
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//cpio: etc/hosts not created: newer or same age file exists
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//etc/hosts <-- should NOT show it
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//2 blocks <-- should say "0 blocks"
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archive_handle->action_header(file_header);
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} else {
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data_skip(archive_handle);
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}
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archive_handle->offset += file_header->size;
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free(file_header->link_target);
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free(file_header->name);
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file_header->link_target = NULL;
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file_header->name = NULL;
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return EXIT_SUCCESS;
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create_hardlinks:
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free(file_header->link_target);
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free(file_header->name);
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while (archive_handle->cpio__hardlinks_to_create) {
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hardlinks_t *cur;
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hardlinks_t *make_me = archive_handle->cpio__hardlinks_to_create;
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archive_handle->cpio__hardlinks_to_create = make_me->next;
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memset(file_header, 0, sizeof(*file_header));
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file_header->mtime = make_me->mtime;
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file_header->name = make_me->name;
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file_header->mode = make_me->mode;
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file_header->uid = make_me->uid;
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file_header->gid = make_me->gid;
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/*file_header->size = 0;*/
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/*file_header->link_target = NULL;*/
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/* Try to find a file we are hardlinked to */
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cur = archive_handle->cpio__created_hardlinks;
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while (cur) {
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/* TODO: must match maj/min too! */
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if (cur->inode == make_me->inode) {
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file_header->link_target = cur->name;
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/* link_target != NULL, size = 0: "I am a hardlink" */
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if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
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archive_handle->action_data(archive_handle);
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free(make_me);
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goto next_link;
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}
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cur = cur->next;
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}
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/* Oops... no file with such inode was created... do it now
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* (happens when hardlinked files are empty (zero length)) */
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if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
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archive_handle->action_data(archive_handle);
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/* Move to the list of created hardlinked files */
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make_me->next = archive_handle->cpio__created_hardlinks;
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archive_handle->cpio__created_hardlinks = make_me;
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next_link: ;
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}
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while (archive_handle->cpio__created_hardlinks) {
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hardlinks_t *p = archive_handle->cpio__created_hardlinks;
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archive_handle->cpio__created_hardlinks = p->next;
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free(p);
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}
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return EXIT_FAILURE; /* "No more files to process" */
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}
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