diff options
Diffstat (limited to 'archival/libunarchive/get_header_cpio.c')
| -rw-r--r-- | archival/libunarchive/get_header_cpio.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/archival/libunarchive/get_header_cpio.c b/archival/libunarchive/get_header_cpio.c new file mode 100644 index 0000000..e027200 --- /dev/null +++ b/archival/libunarchive/get_header_cpio.c @@ -0,0 +1,160 @@ +/* vi: set sw=4 ts=4: */ +/* Copyright 2002 Laurence Anderson + * + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + */ + +#include "libbb.h" +#include "unarchive.h" + +typedef struct hardlinks_s { + char *name; + int inode; + struct hardlinks_s *next; +} hardlinks_t; + +char get_header_cpio(archive_handle_t *archive_handle) +{ + static hardlinks_t *saved_hardlinks = NULL; + static unsigned short pending_hardlinks = 0; + static int inode; + file_header_t *file_header = archive_handle->file_header; + char cpio_header[110]; + int namesize; + char dummy[16]; + int major, minor, nlink; + + if (pending_hardlinks) { /* Deal with any pending hardlinks */ + hardlinks_t *tmp, *oldtmp; + + tmp = saved_hardlinks; + oldtmp = NULL; + + file_header->link_name = file_header->name; + file_header->size = 0; + + while (tmp) { + if (tmp->inode != inode) { + tmp = tmp->next; + continue; + } + + file_header->name = tmp->name; + + if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) { + archive_handle->action_data(archive_handle); + archive_handle->action_header(archive_handle->file_header); + } + + pending_hardlinks--; + + oldtmp = tmp; + tmp = tmp->next; + free(oldtmp->name); + free(oldtmp); + if (oldtmp == saved_hardlinks) + saved_hardlinks = tmp; + } + + file_header->name = file_header->link_name; + + if (pending_hardlinks > 1) { + bb_error_msg("error resolving hardlink: archive made by GNU cpio 2.0-2.2?"); + } + + /* No more pending hardlinks, read next file entry */ + pending_hardlinks = 0; + } + + /* There can be padding before archive header */ + data_align(archive_handle, 4); + + if (archive_xread_all_eof(archive_handle, (unsigned char*)cpio_header, 110) == 0) { + return EXIT_FAILURE; + } + archive_handle->offset += 110; + + if (strncmp(&cpio_header[0], "07070", 5) != 0 + || (cpio_header[5] != '1' && cpio_header[5] != '2') + ) { + bb_error_msg_and_die("unsupported cpio format, use newc or crc"); + } + + { + unsigned long tmpsize; + sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c", + dummy, &inode, (unsigned int*)&file_header->mode, + (unsigned int*)&file_header->uid, (unsigned int*)&file_header->gid, + &nlink, &file_header->mtime, &tmpsize, + dummy, &major, &minor, &namesize, dummy); + file_header->size = tmpsize; + } + + free(file_header->name); + file_header->name = xzalloc(namesize + 1); + /* Read in filename */ + xread(archive_handle->src_fd, file_header->name, namesize); + archive_handle->offset += namesize; + + /* Update offset amount and skip padding before file contents */ + data_align(archive_handle, 4); + + if (strcmp(file_header->name, "TRAILER!!!") == 0) { + /* Always round up */ + printf("%d blocks\n", (int) (archive_handle->offset % 512 ? + archive_handle->offset / 512 + 1 : + archive_handle->offset / 512 + )); + if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */ + hardlinks_t *tmp = saved_hardlinks; + hardlinks_t *oldtmp = NULL; + while (tmp) { + bb_error_msg("%s not created: cannot resolve hardlink", tmp->name); + oldtmp = tmp; + tmp = tmp->next; + free(oldtmp->name); + free(oldtmp); + } + saved_hardlinks = NULL; + pending_hardlinks = 0; + } + return EXIT_FAILURE; + } + + if (S_ISLNK(file_header->mode)) { + file_header->link_name = xzalloc(file_header->size + 1); + xread(archive_handle->src_fd, file_header->link_name, file_header->size); + archive_handle->offset += file_header->size; + file_header->size = 0; /* Stop possible seeks in future */ + } else { + file_header->link_name = NULL; + } + if (nlink > 1 && !S_ISDIR(file_header->mode)) { + if (file_header->size == 0) { /* Put file on a linked list for later */ + hardlinks_t *new = xmalloc(sizeof(hardlinks_t)); + new->next = saved_hardlinks; + new->inode = inode; + /* name current allocated, freed later */ + new->name = file_header->name; + file_header->name = NULL; + saved_hardlinks = new; + return EXIT_SUCCESS; /* Skip this one */ + } + /* Found the file with data in */ + pending_hardlinks = nlink; + } + file_header->device = makedev(major, minor); + + if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) { + archive_handle->action_data(archive_handle); + archive_handle->action_header(archive_handle->file_header); + } else { + data_skip(archive_handle); + } + + archive_handle->offset += file_header->size; + + free(file_header->link_name); + + return EXIT_SUCCESS; +} |