| /* |
| * Unsquash a squashfs filesystem. This is a highly compressed read only |
| * filesystem. |
| * |
| * Copyright (c) 2009, 2010, 2013 |
| * Phillip Lougher <phillip@squashfs.org.uk> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2, |
| * or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| * |
| * unsquash-2.c |
| */ |
| |
| #include "unsquashfs.h" |
| #include "squashfs_compat.h" |
| |
| static squashfs_fragment_entry_2 *fragment_table; |
| |
| void read_block_list_2(unsigned int *block_list, char *block_ptr, int blocks) |
| { |
| TRACE("read_block_list: blocks %d\n", blocks); |
| |
| if(swap) { |
| unsigned int sblock_list[blocks]; |
| memcpy(sblock_list, block_ptr, blocks * sizeof(unsigned int)); |
| SQUASHFS_SWAP_INTS_3(block_list, sblock_list, blocks); |
| } else |
| memcpy(block_list, block_ptr, blocks * sizeof(unsigned int)); |
| } |
| |
| |
| int read_fragment_table_2(long long *directory_table_end) |
| { |
| int res, i; |
| int bytes = SQUASHFS_FRAGMENT_BYTES_2(sBlk.s.fragments); |
| int indexes = SQUASHFS_FRAGMENT_INDEXES_2(sBlk.s.fragments); |
| unsigned int fragment_table_index[indexes]; |
| |
| TRACE("read_fragment_table: %d fragments, reading %d fragment indexes " |
| "from 0x%llx\n", sBlk.s.fragments, indexes, |
| sBlk.s.fragment_table_start); |
| |
| if(sBlk.s.fragments == 0) { |
| *directory_table_end = sBlk.s.fragment_table_start; |
| return TRUE; |
| } |
| |
| fragment_table = malloc(bytes); |
| if(fragment_table == NULL) |
| EXIT_UNSQUASH("read_fragment_table: failed to allocate " |
| "fragment table\n"); |
| |
| if(swap) { |
| unsigned int sfragment_table_index[indexes]; |
| |
| res = read_fs_bytes(fd, sBlk.s.fragment_table_start, |
| SQUASHFS_FRAGMENT_INDEX_BYTES_2(sBlk.s.fragments), |
| sfragment_table_index); |
| if(res == FALSE) { |
| ERROR("read_fragment_table: failed to read fragment " |
| "table index\n"); |
| return FALSE; |
| } |
| SQUASHFS_SWAP_FRAGMENT_INDEXES_2(fragment_table_index, |
| sfragment_table_index, indexes); |
| } else { |
| res = read_fs_bytes(fd, sBlk.s.fragment_table_start, |
| SQUASHFS_FRAGMENT_INDEX_BYTES_2(sBlk.s.fragments), |
| fragment_table_index); |
| if(res == FALSE) { |
| ERROR("read_fragment_table: failed to read fragment " |
| "table index\n"); |
| return FALSE; |
| } |
| } |
| |
| for(i = 0; i < indexes; i++) { |
| int expected = (i + 1) != indexes ? SQUASHFS_METADATA_SIZE : |
| bytes & (SQUASHFS_METADATA_SIZE - 1); |
| int length = read_block(fd, fragment_table_index[i], NULL, |
| expected, ((char *) fragment_table) + (i * |
| SQUASHFS_METADATA_SIZE)); |
| TRACE("Read fragment table block %d, from 0x%x, length %d\n", i, |
| fragment_table_index[i], length); |
| if(length == FALSE) { |
| ERROR("read_fragment_table: failed to read fragment " |
| "table block\n"); |
| return FALSE; |
| } |
| } |
| |
| if(swap) { |
| squashfs_fragment_entry_2 sfragment; |
| for(i = 0; i < sBlk.s.fragments; i++) { |
| SQUASHFS_SWAP_FRAGMENT_ENTRY_2((&sfragment), |
| (&fragment_table[i])); |
| memcpy((char *) &fragment_table[i], (char *) &sfragment, |
| sizeof(squashfs_fragment_entry_2)); |
| } |
| } |
| |
| *directory_table_end = fragment_table_index[0]; |
| return TRUE; |
| } |
| |
| |
| void read_fragment_2(unsigned int fragment, long long *start_block, int *size) |
| { |
| TRACE("read_fragment: reading fragment %d\n", fragment); |
| |
| squashfs_fragment_entry_2 *fragment_entry = &fragment_table[fragment]; |
| *start_block = fragment_entry->start_block; |
| *size = fragment_entry->size; |
| } |
| |
| |
| struct inode *read_inode_2(unsigned int start_block, unsigned int offset) |
| { |
| static union squashfs_inode_header_2 header; |
| long long start = sBlk.s.inode_table_start + start_block; |
| int bytes = lookup_entry(inode_table_hash, start); |
| char *block_ptr = inode_table + bytes + offset; |
| static struct inode i; |
| |
| TRACE("read_inode: reading inode [%d:%d]\n", start_block, offset); |
| |
| if(bytes == -1) |
| EXIT_UNSQUASH("read_inode: inode table block %lld not found\n", |
| start); |
| |
| if(swap) { |
| squashfs_base_inode_header_2 sinode; |
| memcpy(&sinode, block_ptr, sizeof(header.base)); |
| SQUASHFS_SWAP_BASE_INODE_HEADER_2(&header.base, &sinode, |
| sizeof(squashfs_base_inode_header_2)); |
| } else |
| memcpy(&header.base, block_ptr, sizeof(header.base)); |
| |
| i.xattr = SQUASHFS_INVALID_XATTR; |
| i.uid = (uid_t) uid_table[header.base.uid]; |
| i.gid = header.base.guid == SQUASHFS_GUIDS ? i.uid : |
| (uid_t) guid_table[header.base.guid]; |
| i.mode = lookup_type[header.base.inode_type] | header.base.mode; |
| i.type = header.base.inode_type; |
| i.time = sBlk.s.mkfs_time; |
| i.inode_number = inode_number++; |
| |
| switch(header.base.inode_type) { |
| case SQUASHFS_DIR_TYPE: { |
| squashfs_dir_inode_header_2 *inode = &header.dir; |
| |
| if(swap) { |
| squashfs_dir_inode_header_2 sinode; |
| memcpy(&sinode, block_ptr, sizeof(header.dir)); |
| SQUASHFS_SWAP_DIR_INODE_HEADER_2(&header.dir, |
| &sinode); |
| } else |
| memcpy(&header.dir, block_ptr, |
| sizeof(header.dir)); |
| |
| i.data = inode->file_size; |
| i.offset = inode->offset; |
| i.start = inode->start_block; |
| i.time = inode->mtime; |
| break; |
| } |
| case SQUASHFS_LDIR_TYPE: { |
| squashfs_ldir_inode_header_2 *inode = &header.ldir; |
| |
| if(swap) { |
| squashfs_ldir_inode_header_2 sinode; |
| memcpy(&sinode, block_ptr, sizeof(header.ldir)); |
| SQUASHFS_SWAP_LDIR_INODE_HEADER_2(&header.ldir, |
| &sinode); |
| } else |
| memcpy(&header.ldir, block_ptr, |
| sizeof(header.ldir)); |
| |
| i.data = inode->file_size; |
| i.offset = inode->offset; |
| i.start = inode->start_block; |
| i.time = inode->mtime; |
| break; |
| } |
| case SQUASHFS_FILE_TYPE: { |
| squashfs_reg_inode_header_2 *inode = &header.reg; |
| |
| if(swap) { |
| squashfs_reg_inode_header_2 sinode; |
| memcpy(&sinode, block_ptr, sizeof(sinode)); |
| SQUASHFS_SWAP_REG_INODE_HEADER_2(inode, |
| &sinode); |
| } else |
| memcpy(inode, block_ptr, sizeof(*inode)); |
| |
| i.data = inode->file_size; |
| i.time = inode->mtime; |
| i.frag_bytes = inode->fragment == SQUASHFS_INVALID_FRAG |
| ? 0 : inode->file_size % sBlk.s.block_size; |
| i.fragment = inode->fragment; |
| i.offset = inode->offset; |
| i.blocks = inode->fragment == SQUASHFS_INVALID_FRAG ? |
| (i.data + sBlk.s.block_size - 1) >> |
| sBlk.s.block_log : i.data >> |
| sBlk.s.block_log; |
| i.start = inode->start_block; |
| i.sparse = 0; |
| i.block_ptr = block_ptr + sizeof(*inode); |
| break; |
| } |
| case SQUASHFS_SYMLINK_TYPE: { |
| squashfs_symlink_inode_header_2 *inodep = |
| &header.symlink; |
| |
| if(swap) { |
| squashfs_symlink_inode_header_2 sinodep; |
| memcpy(&sinodep, block_ptr, sizeof(sinodep)); |
| SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(inodep, |
| &sinodep); |
| } else |
| memcpy(inodep, block_ptr, sizeof(*inodep)); |
| |
| i.symlink = malloc(inodep->symlink_size + 1); |
| if(i.symlink == NULL) |
| EXIT_UNSQUASH("read_inode: failed to malloc " |
| "symlink data\n"); |
| strncpy(i.symlink, block_ptr + |
| sizeof(squashfs_symlink_inode_header_2), |
| inodep->symlink_size); |
| i.symlink[inodep->symlink_size] = '\0'; |
| i.data = inodep->symlink_size; |
| break; |
| } |
| case SQUASHFS_BLKDEV_TYPE: |
| case SQUASHFS_CHRDEV_TYPE: { |
| squashfs_dev_inode_header_2 *inodep = &header.dev; |
| |
| if(swap) { |
| squashfs_dev_inode_header_2 sinodep; |
| memcpy(&sinodep, block_ptr, sizeof(sinodep)); |
| SQUASHFS_SWAP_DEV_INODE_HEADER_2(inodep, |
| &sinodep); |
| } else |
| memcpy(inodep, block_ptr, sizeof(*inodep)); |
| |
| i.data = inodep->rdev; |
| break; |
| } |
| case SQUASHFS_FIFO_TYPE: |
| case SQUASHFS_SOCKET_TYPE: |
| i.data = 0; |
| break; |
| default: |
| EXIT_UNSQUASH("Unknown inode type %d in " |
| "read_inode_header_2!\n", |
| header.base.inode_type); |
| } |
| return &i; |
| } |