fs/squashfs: new filesystem
Add support for SquashFS filesystem. Right now, it does not support
compression but support for zlib will be added in a follow-up commit.
Signed-off-by: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
diff --git a/fs/squashfs/sqfs.c b/fs/squashfs/sqfs.c
new file mode 100644
index 0000000..340e5eb
--- /dev/null
+++ b/fs/squashfs/sqfs.c
@@ -0,0 +1,1538 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Bootlin
+ *
+ * Author: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
+ *
+ * sqfs.c: SquashFS filesystem implementation
+ */
+
+#include <asm/unaligned.h>
+#include <errno.h>
+#include <fs.h>
+#include <linux/types.h>
+#include <linux/byteorder/little_endian.h>
+#include <linux/byteorder/generic.h>
+#include <memalign.h>
+#include <stdlib.h>
+#include <string.h>
+#include <squashfs.h>
+#include <part.h>
+
+#include "sqfs_decompressor.h"
+#include "sqfs_filesystem.h"
+#include "sqfs_utils.h"
+
+struct squashfs_ctxt {
+ struct disk_partition cur_part_info;
+ struct blk_desc *cur_dev;
+ struct squashfs_super_block *sblk;
+};
+
+static struct squashfs_ctxt ctxt;
+
+static int sqfs_disk_read(__u32 block, __u32 nr_blocks, void *buf)
+{
+ ulong ret;
+
+ if (!ctxt.cur_dev)
+ return -1;
+
+ ret = blk_dread(ctxt.cur_dev, ctxt.cur_part_info.start + block,
+ nr_blocks, buf);
+
+ if (ret != nr_blocks)
+ return -1;
+
+ return ret;
+}
+
+static int sqfs_read_sblk(struct squashfs_super_block **sblk)
+{
+ *sblk = malloc_cache_aligned(ctxt.cur_dev->blksz);
+ if (!*sblk)
+ return -ENOMEM;
+
+ if (sqfs_disk_read(0, 1, *sblk) != 1) {
+ free(*sblk);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int sqfs_count_tokens(const char *filename)
+{
+ int token_count = 1, l;
+
+ for (l = 1; l < strlen(filename); l++) {
+ if (filename[l] == '/')
+ token_count++;
+ }
+
+ /* Ignore trailing '/' in path */
+ if (filename[strlen(filename) - 1] == '/')
+ token_count--;
+
+ if (!token_count)
+ token_count = 1;
+
+ return token_count;
+}
+
+/*
+ * Calculates how many blocks are needed for the buffer used in sqfs_disk_read.
+ * The memory section (e.g. inode table) start offset and its end (i.e. the next
+ * table start) must be specified. It also calculates the offset from which to
+ * start reading the buffer.
+ */
+static int sqfs_calc_n_blks(__le64 start, __le64 end, u64 *offset)
+{
+ u64 start_, table_size;
+
+ table_size = le64_to_cpu(end) - le64_to_cpu(start);
+ start_ = le64_to_cpu(start) / ctxt.cur_dev->blksz;
+ *offset = le64_to_cpu(start) - (start_ * ctxt.cur_dev->blksz);
+
+ return DIV_ROUND_UP(table_size + *offset, ctxt.cur_dev->blksz);
+}
+
+/*
+ * Retrieves fragment block entry and returns true if the fragment block is
+ * compressed
+ */
+static int sqfs_frag_lookup(u32 inode_fragment_index,
+ struct squashfs_fragment_block_entry *e)
+{
+ u64 start, n_blks, src_len, table_offset, start_block;
+ unsigned char *metadata_buffer, *metadata, *table;
+ struct squashfs_fragment_block_entry *entries;
+ struct squashfs_super_block *sblk = ctxt.sblk;
+ unsigned long dest_len;
+ int block, offset, ret;
+ u16 header, comp_type;
+
+ comp_type = get_unaligned_le16(&sblk->compression);
+
+ if (inode_fragment_index >= get_unaligned_le32(&sblk->fragments))
+ return -EINVAL;
+
+ start = get_unaligned_le64(&sblk->fragment_table_start) /
+ ctxt.cur_dev->blksz;
+ n_blks = sqfs_calc_n_blks(sblk->fragment_table_start,
+ sblk->export_table_start,
+ &table_offset);
+
+ /* Allocate a proper sized buffer to store the fragment index table */
+ table = malloc_cache_aligned(n_blks * ctxt.cur_dev->blksz);
+ if (!table)
+ return -ENOMEM;
+
+ if (sqfs_disk_read(start, n_blks, table) < 0) {
+ free(table);
+ return -EINVAL;
+ }
+
+ block = SQFS_FRAGMENT_INDEX(inode_fragment_index);
+ offset = SQFS_FRAGMENT_INDEX_OFFSET(inode_fragment_index);
+
+ /*
+ * Get the start offset of the metadata block that contains the right
+ * fragment block entry
+ */
+ start_block = get_unaligned_le64(table + table_offset + block *
+ sizeof(u64));
+
+ start = start_block / ctxt.cur_dev->blksz;
+ n_blks = sqfs_calc_n_blks(cpu_to_le64(start_block),
+ sblk->fragment_table_start, &table_offset);
+
+ metadata_buffer = malloc_cache_aligned(n_blks * ctxt.cur_dev->blksz);
+ if (!metadata_buffer) {
+ ret = -ENOMEM;
+ goto free_table;
+ }
+
+ if (sqfs_disk_read(start, n_blks, metadata_buffer) < 0) {
+ ret = -EINVAL;
+ goto free_buffer;
+ }
+
+ /* Every metadata block starts with a 16-bit header */
+ header = get_unaligned_le16(metadata_buffer + table_offset);
+ metadata = metadata_buffer + table_offset + SQFS_HEADER_SIZE;
+
+ entries = malloc(SQFS_METADATA_BLOCK_SIZE);
+ if (!entries) {
+ ret = -ENOMEM;
+ goto free_buffer;
+ }
+
+ if (SQFS_COMPRESSED_METADATA(header)) {
+ src_len = SQFS_METADATA_SIZE(header);
+ dest_len = SQFS_METADATA_BLOCK_SIZE;
+ ret = sqfs_decompress(comp_type, entries, &dest_len, metadata,
+ src_len);
+ if (ret) {
+ ret = -EINVAL;
+ goto free_entries;
+ }
+ } else {
+ memcpy(entries, metadata, SQFS_METADATA_SIZE(header));
+ }
+
+ *e = entries[offset];
+ ret = SQFS_COMPRESSED_BLOCK(e->size);
+
+free_entries:
+ free(entries);
+free_buffer:
+ free(metadata_buffer);
+free_table:
+ free(table);
+
+ return ret;
+}
+
+/*
+ * The entry name is a flexible array member, and we don't know its size before
+ * actually reading the entry. So we need a first copy to retrieve this size so
+ * we can finally copy the whole struct.
+ */
+static int sqfs_read_entry(struct squashfs_directory_entry **dest, void *src)
+{
+ struct squashfs_directory_entry *tmp;
+ u16 sz;
+
+ tmp = src;
+ sz = get_unaligned_le16(src + sizeof(*tmp) - sizeof(u16));
+ /*
+ * 'src' points to the begin of a directory entry, and 'sz' gets its
+ * 'name_size' member's value. name_size is actually the string
+ * length - 1, so adding 2 compensates this difference and adds space
+ * for the trailling null byte.
+ */
+ *dest = malloc(sizeof(*tmp) + sz + 2);
+ if (!*dest)
+ return -ENOMEM;
+
+ memcpy(*dest, src, sizeof(*tmp) + sz + 1);
+ (*dest)->name[sz + 1] = '\0';
+
+ return 0;
+}
+
+static int sqfs_get_tokens_length(char **tokens, int count)
+{
+ int length = 0, i;
+
+ /*
+ * 1 is added to the result of strlen to consider the slash separator
+ * between the tokens.
+ */
+ for (i = 0; i < count; i++)
+ length += strlen(tokens[i]) + 1;
+
+ return length;
+}
+
+/* Takes a token list and returns a single string with '/' as separator. */
+static char *sqfs_concat_tokens(char **token_list, int token_count)
+{
+ char *result;
+ int i, length = 0, offset = 0;
+
+ length = sqfs_get_tokens_length(token_list, token_count);
+
+ result = malloc(length + 1);
+ result[length] = '\0';
+
+ for (i = 0; i < token_count; i++) {
+ strcpy(result + offset, token_list[i]);
+ offset += strlen(token_list[i]);
+ result[offset++] = '/';
+ }
+
+ return result;
+}
+
+/*
+ * Differently from sqfs_concat_tokens, sqfs_join writes the result into a
+ * previously allocated string, and returns the number of bytes written.
+ */
+static int sqfs_join(char **strings, char *dest, int start, int end,
+ char separator)
+{
+ int i, offset = 0;
+
+ for (i = start; i < end; i++) {
+ strcpy(dest + offset, strings[i]);
+ offset += strlen(strings[i]);
+ if (i < end - 1)
+ dest[offset++] = separator;
+ }
+
+ return offset;
+}
+
+/*
+ * Fills the given token list using its size (count) and a source string (str)
+ */
+static int sqfs_tokenize(char **tokens, int count, const char *str)
+{
+ char *aux, *strc;
+ int i, j;
+
+ strc = strdup(str);
+ if (!strc)
+ return -ENOMEM;
+
+ if (!strcmp(strc, "/")) {
+ tokens[0] = strdup(strc);
+ if (!tokens[0]) {
+ free(strc);
+ return -ENOMEM;
+ }
+ } else {
+ for (j = 0; j < count; j++) {
+ aux = strtok(!j ? strc : NULL, "/");
+ tokens[j] = strdup(aux);
+ if (!tokens[j]) {
+ for (i = 0; i < j; i++)
+ free(tokens[i]);
+ free(strc);
+ return -ENOMEM;
+ }
+ }
+ }
+
+ free(strc);
+
+ return 0;
+}
+
+/*
+ * Remove last 'updir + 1' tokens from the base path tokens list. This leaves us
+ * with a token list containing only the tokens needed to form the resolved
+ * path, and returns the decremented size of the token list.
+ */
+static int sqfs_clean_base_path(char **base, int count, int updir)
+{
+ int i;
+
+ for (i = count - updir - 1; i < count; i++)
+ free(base[i]);
+
+ return count - updir - 1;
+}
+
+/*
+ * Given the base ("current dir.") path and the relative one, generate the
+ * absolute path.
+ */
+static char *sqfs_get_abs_path(const char *base, const char *rel)
+{
+ char **base_tokens, **rel_tokens, *resolved = NULL;
+ int ret, bc, rc, i, updir = 0, resolved_size = 0, offset = 0;
+
+ /* Memory allocation for the token lists */
+ bc = sqfs_count_tokens(base);
+ rc = sqfs_count_tokens(rel);
+ if (bc < 1 || rc < 1)
+ return NULL;
+
+ base_tokens = malloc(bc * sizeof(char *));
+ if (!base_tokens)
+ return NULL;
+
+ rel_tokens = malloc(rc * sizeof(char *));
+ if (!rel_tokens)
+ goto free_b_tokens;
+
+ /* Fill token lists */
+ ret = sqfs_tokenize(base_tokens, bc, base);
+ if (ret)
+ goto free_r_tokens;
+
+ sqfs_tokenize(rel_tokens, rc, rel);
+ if (ret)
+ goto free_r_tokens;
+
+ /* count '..' occurrences in target path */
+ for (i = 0; i < rc; i++) {
+ if (!strcmp(rel_tokens[i], ".."))
+ updir++;
+ }
+
+ /* Remove the last token and the '..' occurrences */
+ bc = sqfs_clean_base_path(base_tokens, bc, updir);
+ if (bc < 0)
+ goto free_r_tokens;
+
+ /* Calculate resolved path size */
+ if (!bc)
+ resolved_size++;
+
+ resolved_size += sqfs_get_tokens_length(base_tokens, bc) +
+ sqfs_get_tokens_length(rel_tokens, rc);
+
+ resolved = malloc(resolved_size + 1);
+ if (!resolved)
+ goto free_r_tokens_loop;
+
+ /* Set resolved path */
+ memset(resolved, '\0', resolved_size + 1);
+ offset += sqfs_join(base_tokens, resolved + offset, 0, bc, '/');
+ resolved[offset++] = '/';
+ offset += sqfs_join(rel_tokens, resolved + offset, updir, rc, '/');
+
+free_r_tokens_loop:
+ for (i = 0; i < rc; i++)
+ free(rel_tokens[i]);
+ for (i = 0; i < bc; i++)
+ free(base_tokens[i]);
+free_r_tokens:
+ free(rel_tokens);
+free_b_tokens:
+ free(base_tokens);
+
+ return resolved;
+}
+
+static char *sqfs_resolve_symlink(struct squashfs_symlink_inode *sym,
+ const char *base_path)
+{
+ char *resolved, *target;
+ u32 sz;
+
+ sz = get_unaligned_le32(&sym->symlink_size);
+ target = malloc(sz + 1);
+ if (!target)
+ return NULL;
+
+ /*
+ * There is no trailling null byte in the symlink's target path, so a
+ * copy is made and a '\0' is added at its end.
+ */
+ target[sz] = '\0';
+ /* Get target name (relative path) */
+ strncpy(target, sym->symlink, sz);
+
+ /* Relative -> absolute path conversion */
+ resolved = sqfs_get_abs_path(base_path, target);
+
+ free(target);
+
+ return resolved;
+}
+
+/*
+ * m_list contains each metadata block's position, and m_count is the number of
+ * elements of m_list. Those metadata blocks come from the compressed directory
+ * table.
+ */
+static int sqfs_search_dir(struct squashfs_dir_stream *dirs, char **token_list,
+ int token_count, u32 *m_list, int m_count)
+{
+ struct squashfs_super_block *sblk = ctxt.sblk;
+ char *path, *target, **sym_tokens, *res, *rem;
+ int j, ret, new_inode_number, offset;
+ struct squashfs_symlink_inode *sym;
+ struct squashfs_ldir_inode *ldir;
+ struct squashfs_dir_inode *dir;
+ struct fs_dir_stream *dirsp;
+ struct fs_dirent *dent;
+ unsigned char *table;
+
+ dirsp = (struct fs_dir_stream *)dirs;
+
+ /* Start by root inode */
+ table = sqfs_find_inode(dirs->inode_table, le32_to_cpu(sblk->inodes),
+ sblk->inodes, sblk->block_size);
+
+ /* root is a regular directory, not an extended one */
+ dir = (struct squashfs_dir_inode *)table;
+
+ /* get directory offset in directory table */
+ offset = sqfs_dir_offset(table, m_list, m_count);
+ dirs->table = &dirs->dir_table[offset];
+
+ /* Setup directory header */
+ dirs->dir_header = malloc(SQFS_DIR_HEADER_SIZE);
+ if (!dirs->dir_header)
+ return -ENOMEM;
+
+ memcpy(dirs->dir_header, dirs->table, SQFS_DIR_HEADER_SIZE);
+
+ /* Initialize squashfs_dir_stream members */
+ dirs->table += SQFS_DIR_HEADER_SIZE;
+ dirs->size = get_unaligned_le16(&dir->file_size) - SQFS_DIR_HEADER_SIZE;
+ dirs->entry_count = dirs->dir_header->count + 1;
+
+ /* No path given -> root directory */
+ if (!strcmp(token_list[0], "/")) {
+ dirs->table = &dirs->dir_table[offset];
+ memcpy(&dirs->i_dir, dir, sizeof(*dir));
+ return 0;
+ }
+
+ for (j = 0; j < token_count; j++) {
+ if (!sqfs_is_dir(get_unaligned_le16(&dir->inode_type))) {
+ printf("** Cannot find directory. **\n");
+ return -EINVAL;
+ }
+
+ while (!sqfs_readdir(dirsp, &dent)) {
+ ret = strcmp(dent->name, token_list[j]);
+ if (!ret)
+ break;
+ free(dirs->entry);
+ }
+
+ if (ret) {
+ printf("** Cannot find directory. **\n");
+ return -EINVAL;
+ }
+
+ /* Redefine inode as the found token */
+ new_inode_number = dirs->entry->inode_offset +
+ dirs->dir_header->inode_number;
+
+ /* Get reference to inode in the inode table */
+ table = sqfs_find_inode(dirs->inode_table, new_inode_number,
+ sblk->inodes, sblk->block_size);
+ dir = (struct squashfs_dir_inode *)table;
+
+ /* Check for symbolic link and inode type sanity */
+ if (get_unaligned_le16(&dir->inode_type) == SQFS_SYMLINK_TYPE) {
+ sym = (struct squashfs_symlink_inode *)table;
+ /* Get first j + 1 tokens */
+ path = sqfs_concat_tokens(token_list, j + 1);
+ /* Resolve for these tokens */
+ target = sqfs_resolve_symlink(sym, path);
+ /* Join remaining tokens */
+ rem = sqfs_concat_tokens(token_list + j + 1, token_count -
+ j - 1);
+ /* Concatenate remaining tokens and symlink's target */
+ res = malloc(strlen(rem) + strlen(target) + 1);
+ strcpy(res, target);
+ res[strlen(target)] = '/';
+ strcpy(res + strlen(target) + 1, rem);
+ token_count = sqfs_count_tokens(res);
+
+ if (token_count < 0)
+ return -EINVAL;
+
+ sym_tokens = malloc(token_count * sizeof(char *));
+ if (!sym_tokens)
+ return -EINVAL;
+
+ /* Fill tokens list */
+ ret = sqfs_tokenize(sym_tokens, token_count, res);
+ if (ret)
+ return -EINVAL;
+ free(dirs->entry);
+
+ ret = sqfs_search_dir(dirs, sym_tokens, token_count,
+ m_list, m_count);
+ return ret;
+ } else if (!sqfs_is_dir(get_unaligned_le16(&dir->inode_type))) {
+ printf("** Cannot find directory. **\n");
+ free(dirs->entry);
+ return -EINVAL;
+ }
+
+ /* Check if it is an extended dir. */
+ if (get_unaligned_le16(&dir->inode_type) == SQFS_LDIR_TYPE)
+ ldir = (struct squashfs_ldir_inode *)table;
+
+ /* Get dir. offset into the directory table */
+ offset = sqfs_dir_offset(table, m_list, m_count);
+ dirs->table = &dirs->dir_table[offset];
+
+ /* Copy directory header */
+ memcpy(dirs->dir_header, &dirs->dir_table[offset],
+ SQFS_DIR_HEADER_SIZE);
+
+ /* Check for empty directory */
+ if (sqfs_is_empty_dir(table)) {
+ printf("Empty directory.\n");
+ free(dirs->entry);
+ return SQFS_EMPTY_DIR;
+ }
+
+ dirs->table += SQFS_DIR_HEADER_SIZE;
+ dirs->size = get_unaligned_le16(&dir->file_size);
+ dirs->entry_count = dirs->dir_header->count + 1;
+ dirs->size -= SQFS_DIR_HEADER_SIZE;
+ free(dirs->entry);
+ }
+
+ offset = sqfs_dir_offset(table, m_list, m_count);
+ dirs->table = &dirs->dir_table[offset];
+
+ if (get_unaligned_le16(&dir->inode_type) == SQFS_DIR_TYPE)
+ memcpy(&dirs->i_dir, dir, sizeof(*dir));
+ else
+ memcpy(&dirs->i_ldir, ldir, sizeof(*ldir));
+
+ return 0;
+}
+
+/*
+ * Inode and directory tables are stored as a series of metadata blocks, and
+ * given the compressed size of this table, we can calculate how much metadata
+ * blocks are needed to store the result of the decompression, since a
+ * decompressed metadata block should have a size of 8KiB.
+ */
+static int sqfs_count_metablks(void *table, u32 offset, int table_size)
+{
+ int count = 0, cur_size = 0, ret;
+ u32 data_size;
+ bool comp;
+
+ do {
+ ret = sqfs_read_metablock(table, offset + cur_size, &comp,
+ &data_size);
+ if (ret)
+ return -EINVAL;
+ cur_size += data_size + SQFS_HEADER_SIZE;
+ count++;
+ } while (cur_size < table_size);
+
+ return count;
+}
+
+/*
+ * Storing the metadata blocks header's positions will be useful while looking
+ * for an entry in the directory table, using the reference (index and offset)
+ * given by its inode.
+ */
+static int sqfs_get_metablk_pos(u32 *pos_list, void *table, u32 offset,
+ int metablks_count)
+{
+ u32 data_size, cur_size = 0;
+ int j, ret = 0;
+ bool comp;
+
+ if (!metablks_count)
+ return -EINVAL;
+
+ for (j = 0; j < metablks_count; j++) {
+ ret = sqfs_read_metablock(table, offset + cur_size, &comp,
+ &data_size);
+ if (ret)
+ return -EINVAL;
+
+ cur_size += data_size + SQFS_HEADER_SIZE;
+ pos_list[j] = cur_size;
+ }
+
+ return ret;
+}
+
+static int sqfs_read_inode_table(unsigned char **inode_table)
+{
+ struct squashfs_super_block *sblk = ctxt.sblk;
+ u64 start, n_blks, table_offset, table_size;
+ int j, ret = 0, metablks_count, comp_type;
+ unsigned char *src_table, *itb;
+ u32 src_len, dest_offset = 0;
+ unsigned long dest_len;
+ bool compressed;
+
+ comp_type = get_unaligned_le16(&sblk->compression);
+ table_size = get_unaligned_le64(&sblk->directory_table_start) -
+ get_unaligned_le64(&sblk->inode_table_start);
+ start = get_unaligned_le64(&sblk->inode_table_start) /
+ ctxt.cur_dev->blksz;
+ n_blks = sqfs_calc_n_blks(sblk->inode_table_start,
+ sblk->directory_table_start, &table_offset);
+
+ /* Allocate a proper sized buffer (itb) to store the inode table */
+ itb = malloc_cache_aligned(n_blks * ctxt.cur_dev->blksz);
+ if (!itb)
+ return -ENOMEM;
+
+ if (sqfs_disk_read(start, n_blks, itb) < 0) {
+ ret = -EINVAL;
+ goto free_itb;
+ }
+
+ /* Parse inode table (metadata block) header */
+ ret = sqfs_read_metablock(itb, table_offset, &compressed, &src_len);
+ if (ret) {
+ ret = -EINVAL;
+ goto free_itb;
+ }
+
+ /* Calculate size to store the whole decompressed table */
+ metablks_count = sqfs_count_metablks(itb, table_offset, table_size);
+ if (metablks_count < 1) {
+ ret = -EINVAL;
+ goto free_itb;
+ }
+
+ *inode_table = malloc(metablks_count * SQFS_METADATA_BLOCK_SIZE);
+ if (!*inode_table) {
+ ret = -ENOMEM;
+ goto free_itb;
+ }
+
+ src_table = itb + table_offset + SQFS_HEADER_SIZE;
+
+ /* Extract compressed Inode table */
+ for (j = 0; j < metablks_count; j++) {
+ sqfs_read_metablock(itb, table_offset, &compressed, &src_len);
+ if (compressed) {
+ dest_len = SQFS_METADATA_BLOCK_SIZE;
+ ret = sqfs_decompress(comp_type, *inode_table +
+ dest_offset, &dest_len,
+ src_table, src_len);
+ if (ret) {
+ free(*inode_table);
+ goto free_itb;
+ }
+
+ } else {
+ memcpy(*inode_table + (j * SQFS_METADATA_BLOCK_SIZE),
+ src_table, src_len);
+ }
+
+ /*
+ * Offsets to the decompression destination, to the metadata
+ * buffer 'itb' and to the decompression source, respectively.
+ */
+ dest_offset += dest_len;
+ table_offset += src_len + SQFS_HEADER_SIZE;
+ src_table += src_len + SQFS_HEADER_SIZE;
+ }
+
+free_itb:
+ free(itb);
+
+ return ret;
+}
+
+static int sqfs_read_directory_table(unsigned char **dir_table, u32 **pos_list)
+{
+ u64 start, n_blks, table_offset, table_size;
+ int j, ret = 0, metablks_count = -1, comp_type;
+ struct squashfs_super_block *sblk = ctxt.sblk;
+ unsigned char *src_table, *dtb;
+ u32 src_len, dest_offset = 0;
+ unsigned long dest_len;
+ bool compressed;
+
+ comp_type = get_unaligned_le16(&sblk->compression);
+
+ /* DIRECTORY TABLE */
+ table_size = get_unaligned_le64(&sblk->fragment_table_start) -
+ get_unaligned_le64(&sblk->directory_table_start);
+ start = get_unaligned_le64(&sblk->directory_table_start) /
+ ctxt.cur_dev->blksz;
+ n_blks = sqfs_calc_n_blks(sblk->directory_table_start,
+ sblk->fragment_table_start, &table_offset);
+
+ /* Allocate a proper sized buffer (dtb) to store the directory table */
+ dtb = malloc_cache_aligned(n_blks * ctxt.cur_dev->blksz);
+ if (!dtb)
+ return -ENOMEM;
+
+ if (sqfs_disk_read(start, n_blks, dtb) < 0)
+ goto free_dtb;
+
+ /* Parse directory table (metadata block) header */
+ ret = sqfs_read_metablock(dtb, table_offset, &compressed, &src_len);
+ if (ret)
+ goto free_dtb;
+
+ /* Calculate total size to store the whole decompressed table */
+ metablks_count = sqfs_count_metablks(dtb, table_offset, table_size);
+ if (metablks_count < 1)
+ goto free_dtb;
+
+ *dir_table = malloc(metablks_count * SQFS_METADATA_BLOCK_SIZE);
+ if (!*dir_table)
+ goto free_dtb;
+
+ *pos_list = malloc(metablks_count * sizeof(u32));
+ if (!*pos_list) {
+ free(*dir_table);
+ goto free_dtb;
+ }
+
+ ret = sqfs_get_metablk_pos(*pos_list, dtb, table_offset,
+ metablks_count);
+ if (ret) {
+ metablks_count = -1;
+ free(*dir_table);
+ free(*pos_list);
+ goto free_dtb;
+ }
+
+ src_table = dtb + table_offset + SQFS_HEADER_SIZE;
+
+ /* Extract compressed Directory table */
+ dest_offset = 0;
+ for (j = 0; j < metablks_count; j++) {
+ sqfs_read_metablock(dtb, table_offset, &compressed, &src_len);
+ if (compressed) {
+ dest_len = SQFS_METADATA_BLOCK_SIZE;
+ ret = sqfs_decompress(comp_type, *dir_table +
+ (j * SQFS_METADATA_BLOCK_SIZE),
+ &dest_len, src_table, src_len);
+ if (ret) {
+ metablks_count = -1;
+ free(*dir_table);
+ goto free_dtb;
+ }
+
+ if (dest_len < SQFS_METADATA_BLOCK_SIZE) {
+ dest_offset += dest_len;
+ break;
+ }
+ } else {
+ memcpy(*dir_table + (j * SQFS_METADATA_BLOCK_SIZE),
+ src_table, src_len);
+ }
+
+ /*
+ * Offsets to the decompression destination, to the metadata
+ * buffer 'dtb' and to the decompression source, respectively.
+ */
+ dest_offset += dest_len;
+ table_offset += src_len + SQFS_HEADER_SIZE;
+ src_table += src_len + SQFS_HEADER_SIZE;
+ }
+
+free_dtb:
+ free(dtb);
+
+ return metablks_count;
+}
+
+int sqfs_opendir(const char *filename, struct fs_dir_stream **dirsp)
+{
+ unsigned char *inode_table = NULL, *dir_table = NULL;
+ int j, token_count, ret = 0, metablks_count;
+ struct squashfs_dir_stream *dirs;
+ char **token_list, *path;
+ u32 *pos_list = NULL;
+
+ dirs = malloc(sizeof(*dirs));
+ if (!dirs)
+ return -EINVAL;
+
+ ret = sqfs_read_inode_table(&inode_table);
+ if (ret)
+ return -EINVAL;
+
+ metablks_count = sqfs_read_directory_table(&dir_table, &pos_list);
+ if (metablks_count < 1)
+ return -EINVAL;
+
+ /* Tokenize filename */
+ token_count = sqfs_count_tokens(filename);
+ if (token_count < 0)
+ return -EINVAL;
+
+ path = strdup(filename);
+ if (!path)
+ return -ENOMEM;
+
+ token_list = malloc(token_count * sizeof(char *));
+ if (!token_list) {
+ ret = -EINVAL;
+ goto free_path;
+ }
+
+ /* Fill tokens list */
+ ret = sqfs_tokenize(token_list, token_count, path);
+ if (ret)
+ goto free_tokens;
+ /*
+ * ldir's (extended directory) size is greater than dir, so it works as
+ * a general solution for the malloc size, since 'i' is a union.
+ */
+ dirs->inode_table = inode_table;
+ dirs->dir_table = dir_table;
+ ret = sqfs_search_dir(dirs, token_list, token_count, pos_list,
+ metablks_count);
+ if (ret)
+ goto free_tokens;
+
+ if (le16_to_cpu(dirs->i_dir.inode_type) == SQFS_DIR_TYPE)
+ dirs->size = le16_to_cpu(dirs->i_dir.file_size);
+ else
+ dirs->size = le32_to_cpu(dirs->i_ldir.file_size);
+
+ /* Setup directory header */
+ memcpy(dirs->dir_header, dirs->table, SQFS_DIR_HEADER_SIZE);
+ dirs->entry_count = dirs->dir_header->count + 1;
+ dirs->size -= SQFS_DIR_HEADER_SIZE;
+
+ /* Setup entry */
+ dirs->entry = NULL;
+ dirs->table += SQFS_DIR_HEADER_SIZE;
+
+ *dirsp = (struct fs_dir_stream *)dirs;
+
+free_tokens:
+ for (j = 0; j < token_count; j++)
+ free(token_list[j]);
+ free(token_list);
+ free(pos_list);
+free_path:
+ free(path);
+
+ return ret;
+}
+
+int sqfs_readdir(struct fs_dir_stream *fs_dirs, struct fs_dirent **dentp)
+{
+ struct squashfs_super_block *sblk = ctxt.sblk;
+ struct squashfs_dir_stream *dirs;
+ struct squashfs_lreg_inode *lreg;
+ struct squashfs_base_inode *base;
+ struct squashfs_reg_inode *reg;
+ int i_number, offset = 0, ret;
+ struct fs_dirent *dent;
+ unsigned char *ipos;
+
+ dirs = (struct squashfs_dir_stream *)fs_dirs;
+ if (!dirs->size) {
+ *dentp = NULL;
+ return -SQFS_STOP_READDIR;
+ }
+
+ dent = &dirs->dentp;
+
+ if (!dirs->entry_count) {
+ if (dirs->size > SQFS_DIR_HEADER_SIZE) {
+ dirs->size -= SQFS_DIR_HEADER_SIZE;
+ } else {
+ *dentp = NULL;
+ dirs->size = 0;
+ return -SQFS_STOP_READDIR;
+ }
+
+ if (dirs->size > SQFS_EMPTY_FILE_SIZE) {
+ /* Read follow-up (emitted) dir. header */
+ memcpy(dirs->dir_header, dirs->table,
+ SQFS_DIR_HEADER_SIZE);
+ dirs->entry_count = dirs->dir_header->count + 1;
+ ret = sqfs_read_entry(&dirs->entry, dirs->table +
+ SQFS_DIR_HEADER_SIZE);
+ if (ret)
+ return -SQFS_STOP_READDIR;
+
+ dirs->table += SQFS_DIR_HEADER_SIZE;
+ }
+ } else {
+ ret = sqfs_read_entry(&dirs->entry, dirs->table);
+ if (ret)
+ return -SQFS_STOP_READDIR;
+ }
+
+ i_number = dirs->dir_header->inode_number + dirs->entry->inode_offset;
+ ipos = sqfs_find_inode(dirs->inode_table, i_number, sblk->inodes,
+ sblk->block_size);
+
+ base = (struct squashfs_base_inode *)ipos;
+
+ /* Set entry type and size */
+ switch (dirs->entry->type) {
+ case SQFS_DIR_TYPE:
+ case SQFS_LDIR_TYPE:
+ dent->type = FS_DT_DIR;
+ break;
+ case SQFS_REG_TYPE:
+ case SQFS_LREG_TYPE:
+ /*
+ * Entries do not differentiate extended from regular types, so
+ * it needs to be verified manually.
+ */
+ if (get_unaligned_le16(&base->inode_type) == SQFS_LREG_TYPE) {
+ lreg = (struct squashfs_lreg_inode *)ipos;
+ dent->size = get_unaligned_le64(&lreg->file_size);
+ } else {
+ reg = (struct squashfs_reg_inode *)ipos;
+ dent->size = get_unaligned_le32(®->file_size);
+ }
+
+ dent->type = FS_DT_REG;
+ break;
+ case SQFS_BLKDEV_TYPE:
+ case SQFS_CHRDEV_TYPE:
+ case SQFS_LBLKDEV_TYPE:
+ case SQFS_LCHRDEV_TYPE:
+ case SQFS_FIFO_TYPE:
+ case SQFS_SOCKET_TYPE:
+ case SQFS_LFIFO_TYPE:
+ case SQFS_LSOCKET_TYPE:
+ dent->type = SQFS_MISC_ENTRY_TYPE;
+ break;
+ case SQFS_SYMLINK_TYPE:
+ case SQFS_LSYMLINK_TYPE:
+ dent->type = FS_DT_LNK;
+ break;
+ default:
+ return -SQFS_STOP_READDIR;
+ }
+
+ /* Set entry name */
+ strncpy(dent->name, dirs->entry->name, dirs->entry->name_size + 1);
+ dent->name[dirs->entry->name_size + 1] = '\0';
+
+ offset = dirs->entry->name_size + 1 + SQFS_ENTRY_BASE_LENGTH;
+ dirs->entry_count--;
+
+ /* Decrement size to be read */
+ if (dirs->size > offset)
+ dirs->size -= offset;
+ else
+ dirs->size = 0;
+
+ /* Keep a reference to the current entry before incrementing it */
+ dirs->table += offset;
+
+ *dentp = dent;
+
+ return 0;
+}
+
+int sqfs_probe(struct blk_desc *fs_dev_desc, struct disk_partition *fs_partition)
+{
+ struct squashfs_super_block *sblk;
+ int ret;
+
+ ctxt.cur_dev = fs_dev_desc;
+ ctxt.cur_part_info = *fs_partition;
+
+ ret = sqfs_read_sblk(&sblk);
+ if (ret)
+ return ret;
+
+ /* Make sure it has a valid SquashFS magic number*/
+ if (get_unaligned_le32(&sblk->s_magic) != SQFS_MAGIC_NUMBER) {
+ printf("Bad magic number for SquashFS image.\n");
+ ctxt.cur_dev = NULL;
+ return -EINVAL;
+ }
+
+ ctxt.sblk = sblk;
+
+ return 0;
+}
+
+static char *sqfs_basename(char *path)
+{
+ char *fname;
+
+ fname = path + strlen(path) - 1;
+ while (fname >= path) {
+ if (*fname == '/') {
+ fname++;
+ break;
+ }
+
+ fname--;
+ }
+
+ return fname;
+}
+
+static char *sqfs_dirname(char *path)
+{
+ char *fname;
+
+ fname = sqfs_basename(path);
+ --fname;
+ *fname = '\0';
+
+ return path;
+}
+
+/*
+ * Takes a path to file and splits it in two parts: the filename itself and the
+ * directory's path, e.g.:
+ * path: /path/to/file.txt
+ * file: file.txt
+ * dir: /path/to
+ */
+static int sqfs_split_path(char **file, char **dir, const char *path)
+{
+ char *dirc, *basec, *bname, *dname, *tmp_path;
+ int ret = 0;
+
+ /* check for first slash in path*/
+ if (path[0] == '/') {
+ tmp_path = strdup(path);
+ if (!tmp_path)
+ return -ENOMEM;
+ } else {
+ tmp_path = malloc(strlen(path) + 2);
+ if (!tmp_path)
+ return -ENOMEM;
+ tmp_path[0] = '/';
+ strcpy(tmp_path + 1, path);
+ }
+
+ /* String duplicates */
+ dirc = strdup(tmp_path);
+ if (!dirc) {
+ ret = -ENOMEM;
+ goto free_tmp;
+ }
+
+ basec = strdup(tmp_path);
+ if (!basec) {
+ ret = -ENOMEM;
+ goto free_dirc;
+ }
+
+ dname = sqfs_dirname(dirc);
+ bname = sqfs_basename(basec);
+
+ *file = strdup(bname);
+
+ if (!*file) {
+ ret = -ENOMEM;
+ goto free_basec;
+ }
+
+ if (*dname == '\0') {
+ *dir = malloc(2);
+ if (!*dir) {
+ ret = -ENOMEM;
+ goto free_basec;
+ }
+
+ (*dir)[0] = '/';
+ (*dir)[1] = '\0';
+ } else {
+ *dir = strdup(dname);
+ if (!*dir) {
+ ret = -ENOMEM;
+ goto free_basec;
+ }
+ }
+
+free_basec:
+ free(basec);
+free_dirc:
+ free(dirc);
+free_tmp:
+ free(tmp_path);
+
+ return ret;
+}
+
+static int sqfs_get_regfile_info(struct squashfs_reg_inode *reg,
+ struct squashfs_file_info *finfo,
+ struct squashfs_fragment_block_entry *fentry,
+ __le32 blksz)
+{
+ int datablk_count = 0, ret;
+
+ finfo->size = get_unaligned_le32(®->file_size);
+ finfo->offset = get_unaligned_le32(®->offset);
+ finfo->start = get_unaligned_le32(®->start_block);
+ finfo->frag = SQFS_IS_FRAGMENTED(get_unaligned_le32(®->fragment));
+
+ if (finfo->frag) {
+ datablk_count = finfo->size / le32_to_cpu(blksz);
+ ret = sqfs_frag_lookup(get_unaligned_le32(®->fragment),
+ fentry);
+ if (ret < 0)
+ return -EINVAL;
+ finfo->comp = true;
+ } else {
+ datablk_count = DIV_ROUND_UP(finfo->size, le32_to_cpu(blksz));
+ }
+
+ finfo->blk_sizes = malloc(datablk_count * sizeof(u32));
+ if (!finfo->blk_sizes)
+ return -ENOMEM;
+
+ return datablk_count;
+}
+
+static int sqfs_get_lregfile_info(struct squashfs_lreg_inode *lreg,
+ struct squashfs_file_info *finfo,
+ struct squashfs_fragment_block_entry *fentry,
+ __le32 blksz)
+{
+ int datablk_count = 0, ret;
+
+ finfo->size = get_unaligned_le64(&lreg->file_size);
+ finfo->offset = get_unaligned_le32(&lreg->offset);
+ finfo->start = get_unaligned_le64(&lreg->start_block);
+ finfo->frag = SQFS_IS_FRAGMENTED(get_unaligned_le32(&lreg->fragment));
+
+ if (finfo->frag) {
+ datablk_count = finfo->size / le32_to_cpu(blksz);
+ ret = sqfs_frag_lookup(get_unaligned_le32(&lreg->fragment),
+ fentry);
+ if (ret < 0)
+ return -EINVAL;
+ finfo->comp = true;
+ } else {
+ datablk_count = DIV_ROUND_UP(finfo->size, le32_to_cpu(blksz));
+ }
+
+ finfo->blk_sizes = malloc(datablk_count * sizeof(u32));
+ if (!finfo->blk_sizes)
+ return -ENOMEM;
+
+ return datablk_count;
+}
+
+int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
+ loff_t *actread)
+{
+ char *dir, *fragment_block, *datablock = NULL, *data_buffer = NULL;
+ char *fragment, *file, *resolved, *data;
+ u64 start, n_blks, table_size, data_offset, table_offset;
+ int ret, j, i_number, comp_type, datablk_count = 0;
+ struct squashfs_super_block *sblk = ctxt.sblk;
+ struct squashfs_fragment_block_entry frag_entry;
+ struct squashfs_file_info finfo = {0};
+ struct squashfs_symlink_inode *symlink;
+ struct fs_dir_stream *dirsp = NULL;
+ struct squashfs_dir_stream *dirs;
+ struct squashfs_lreg_inode *lreg;
+ struct squashfs_base_inode *base;
+ struct squashfs_reg_inode *reg;
+ unsigned long dest_len;
+ struct fs_dirent *dent;
+ unsigned char *ipos;
+
+ *actread = 0;
+
+ comp_type = get_unaligned_le16(&sblk->compression);
+
+ /*
+ * sqfs_opendir will uncompress inode and directory tables, and will
+ * return a pointer to the directory that contains the requested file.
+ */
+ sqfs_split_path(&file, &dir, filename);
+ ret = sqfs_opendir(dir, &dirsp);
+ if (ret) {
+ sqfs_closedir(dirsp);
+ goto free_paths;
+ }
+
+ dirs = (struct squashfs_dir_stream *)dirsp;
+
+ /* For now, only regular files are able to be loaded */
+ while (!sqfs_readdir(dirsp, &dent)) {
+ ret = strcmp(dent->name, file);
+ if (!ret)
+ break;
+
+ free(dirs->entry);
+ }
+
+ if (ret) {
+ printf("File not found.\n");
+ *actread = 0;
+ sqfs_closedir(dirsp);
+ ret = -ENOENT;
+ goto free_paths;
+ }
+
+ i_number = dirs->dir_header->inode_number + dirs->entry->inode_offset;
+ ipos = sqfs_find_inode(dirs->inode_table, i_number, sblk->inodes,
+ sblk->block_size);
+
+ base = (struct squashfs_base_inode *)ipos;
+ switch (get_unaligned_le16(&base->inode_type)) {
+ case SQFS_REG_TYPE:
+ reg = (struct squashfs_reg_inode *)ipos;
+ datablk_count = sqfs_get_regfile_info(reg, &finfo, &frag_entry,
+ sblk->block_size);
+ if (datablk_count < 0) {
+ ret = -EINVAL;
+ goto free_paths;
+ }
+
+ memcpy(finfo.blk_sizes, ipos + sizeof(*reg),
+ datablk_count * sizeof(u32));
+ break;
+ case SQFS_LREG_TYPE:
+ lreg = (struct squashfs_lreg_inode *)ipos;
+ datablk_count = sqfs_get_lregfile_info(lreg, &finfo,
+ &frag_entry,
+ sblk->block_size);
+ if (datablk_count < 0) {
+ ret = -EINVAL;
+ goto free_paths;
+ }
+
+ memcpy(finfo.blk_sizes, ipos + sizeof(*lreg),
+ datablk_count * sizeof(u32));
+ break;
+ case SQFS_SYMLINK_TYPE:
+ case SQFS_LSYMLINK_TYPE:
+ symlink = (struct squashfs_symlink_inode *)ipos;
+ resolved = sqfs_resolve_symlink(symlink, filename);
+ ret = sqfs_read(resolved, buf, offset, len, actread);
+ free(resolved);
+ goto free_paths;
+ case SQFS_BLKDEV_TYPE:
+ case SQFS_CHRDEV_TYPE:
+ case SQFS_LBLKDEV_TYPE:
+ case SQFS_LCHRDEV_TYPE:
+ case SQFS_FIFO_TYPE:
+ case SQFS_SOCKET_TYPE:
+ case SQFS_LFIFO_TYPE:
+ case SQFS_LSOCKET_TYPE:
+ default:
+ printf("Unsupported entry type\n");
+ ret = -EINVAL;
+ goto free_paths;
+ }
+
+ /* If the user specifies a length, check its sanity */
+ if (len) {
+ if (len > finfo.size) {
+ ret = -EINVAL;
+ goto free_paths;
+ }
+
+ finfo.size = len;
+ }
+
+ if (datablk_count) {
+ data_offset = finfo.start;
+ datablock = malloc(get_unaligned_le32(&sblk->block_size));
+ if (!datablock) {
+ ret = -ENOMEM;
+ goto free_paths;
+ }
+ }
+
+ for (j = 0; j < datablk_count; j++) {
+ start = data_offset / ctxt.cur_dev->blksz;
+ table_size = SQFS_BLOCK_SIZE(finfo.blk_sizes[j]);
+ table_offset = data_offset - (start * ctxt.cur_dev->blksz);
+ n_blks = DIV_ROUND_UP(table_size + table_offset,
+ ctxt.cur_dev->blksz);
+
+ data_buffer = malloc_cache_aligned(n_blks * ctxt.cur_dev->blksz);
+
+ if (!data_buffer) {
+ ret = -ENOMEM;
+ goto free_datablk;
+ }
+
+ ret = sqfs_disk_read(start, n_blks, data_buffer);
+ if (ret < 0) {
+ /*
+ * Possible causes: too many data blocks or too large
+ * SquashFS block size. Tip: re-compile the SquashFS
+ * image with mksquashfs's -b <block_size> option.
+ */
+ printf("Error: too many data blocks to be read.\n");
+ goto free_buffer;
+ }
+
+ data = data_buffer + table_offset;
+
+ /* Load the data */
+ if (SQFS_COMPRESSED_BLOCK(finfo.blk_sizes[j])) {
+ dest_len = get_unaligned_le32(&sblk->block_size);
+ ret = sqfs_decompress(comp_type, datablock, &dest_len,
+ data, table_size);
+ if (ret)
+ goto free_buffer;
+
+ memcpy(buf + offset + *actread, datablock, dest_len);
+ *actread += dest_len;
+ } else {
+ memcpy(buf + offset + *actread, data, table_size);
+ *actread += table_size;
+ }
+
+ data_offset += table_size;
+ }
+
+ free(finfo.blk_sizes);
+
+ /*
+ * There is no need to continue if the file is not fragmented.
+ */
+ if (!finfo.frag) {
+ ret = 0;
+ goto free_buffer;
+ }
+
+ start = frag_entry.start / ctxt.cur_dev->blksz;
+ table_size = SQFS_BLOCK_SIZE(frag_entry.size);
+ table_offset = frag_entry.start - (start * ctxt.cur_dev->blksz);
+ n_blks = DIV_ROUND_UP(table_size + table_offset, ctxt.cur_dev->blksz);
+
+ fragment = malloc_cache_aligned(n_blks * ctxt.cur_dev->blksz);
+
+ if (!fragment) {
+ ret = -ENOMEM;
+ goto free_buffer;
+ }
+
+ ret = sqfs_disk_read(start, n_blks, fragment);
+ if (ret < 0)
+ goto free_fragment;
+
+ /* File compressed and fragmented */
+ if (finfo.frag && finfo.comp) {
+ dest_len = get_unaligned_le32(&sblk->block_size);
+ fragment_block = malloc(dest_len);
+ if (!fragment_block) {
+ ret = -ENOMEM;
+ goto free_fragment;
+ }
+
+ ret = sqfs_decompress(comp_type, fragment_block, &dest_len,
+ (void *)fragment + table_offset,
+ frag_entry.size);
+ if (ret) {
+ free(fragment_block);
+ goto free_fragment;
+ }
+
+ for (j = offset + *actread; j < finfo.size; j++) {
+ memcpy(buf + j, &fragment_block[finfo.offset + j], 1);
+ (*actread)++;
+ }
+
+ free(fragment_block);
+
+ } else if (finfo.frag && !finfo.comp) {
+ fragment_block = (void *)fragment + table_offset;
+
+ for (j = offset + *actread; j < finfo.size; j++) {
+ memcpy(buf + j, &fragment_block[finfo.offset + j], 1);
+ (*actread)++;
+ }
+ }
+
+free_fragment:
+ free(fragment);
+free_buffer:
+ if (datablk_count)
+ free(data_buffer);
+free_datablk:
+ if (datablk_count)
+ free(datablock);
+free_paths:
+ free(file);
+ free(dir);
+
+ return ret;
+}
+
+int sqfs_size(const char *filename, loff_t *size)
+{
+ struct squashfs_super_block *sblk = ctxt.sblk;
+ struct squashfs_symlink_inode *symlink;
+ struct fs_dir_stream *dirsp = NULL;
+ struct squashfs_base_inode *base;
+ struct squashfs_dir_stream *dirs;
+ struct squashfs_lreg_inode *lreg;
+ struct squashfs_reg_inode *reg;
+ char *dir, *file, *resolved;
+ struct fs_dirent *dent;
+ unsigned char *ipos;
+ int ret, i_number;
+
+ sqfs_split_path(&file, &dir, filename);
+ /*
+ * sqfs_opendir will uncompress inode and directory tables, and will
+ * return a pointer to the directory that contains the requested file.
+ */
+ ret = sqfs_opendir(dir, &dirsp);
+ if (ret) {
+ sqfs_closedir(dirsp);
+ ret = -EINVAL;
+ goto free_strings;
+ }
+
+ dirs = (struct squashfs_dir_stream *)dirsp;
+
+ while (!sqfs_readdir(dirsp, &dent)) {
+ ret = strcmp(dent->name, file);
+ if (!ret)
+ break;
+ free(dirs->entry);
+ }
+
+ if (ret) {
+ printf("File not found.\n");
+ *size = 0;
+ ret = -EINVAL;
+ goto free_strings;
+ }
+
+ i_number = dirs->dir_header->inode_number + dirs->entry->inode_offset;
+ ipos = sqfs_find_inode(dirs->inode_table, i_number, sblk->inodes,
+ sblk->block_size);
+ free(dirs->entry);
+
+ base = (struct squashfs_base_inode *)ipos;
+ switch (get_unaligned_le16(&base->inode_type)) {
+ case SQFS_REG_TYPE:
+ reg = (struct squashfs_reg_inode *)ipos;
+ *size = get_unaligned_le32(®->file_size);
+ break;
+ case SQFS_LREG_TYPE:
+ lreg = (struct squashfs_lreg_inode *)ipos;
+ *size = get_unaligned_le64(&lreg->file_size);
+ break;
+ case SQFS_SYMLINK_TYPE:
+ case SQFS_LSYMLINK_TYPE:
+ symlink = (struct squashfs_symlink_inode *)ipos;
+ resolved = sqfs_resolve_symlink(symlink, filename);
+ ret = sqfs_size(resolved, size);
+ free(resolved);
+ break;
+ case SQFS_BLKDEV_TYPE:
+ case SQFS_CHRDEV_TYPE:
+ case SQFS_LBLKDEV_TYPE:
+ case SQFS_LCHRDEV_TYPE:
+ case SQFS_FIFO_TYPE:
+ case SQFS_SOCKET_TYPE:
+ case SQFS_LFIFO_TYPE:
+ case SQFS_LSOCKET_TYPE:
+ default:
+ printf("Unable to recover entry's size.\n");
+ *size = 0;
+ ret = -EINVAL;
+ break;
+ }
+
+free_strings:
+ free(dir);
+ free(file);
+
+ sqfs_closedir(dirsp);
+
+ return ret;
+}
+
+void sqfs_close(void)
+{
+ free(ctxt.sblk);
+ ctxt.cur_dev = NULL;
+}
+
+void sqfs_closedir(struct fs_dir_stream *dirs)
+{
+ struct squashfs_dir_stream *sqfs_dirs;
+
+ sqfs_dirs = (struct squashfs_dir_stream *)dirs;
+ free(sqfs_dirs->inode_table);
+ free(sqfs_dirs->dir_table);
+ free(sqfs_dirs->dir_header);
+}