diff options
author | David Oberhollenzer <david.oberhollenzer@sigma-star.at> | 2023-01-31 11:21:30 +0100 |
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committer | David Oberhollenzer <david.oberhollenzer@sigma-star.at> | 2023-01-31 13:51:49 +0100 |
commit | cdccc69c62579b0c13b35fad0728079652b8f3c9 (patch) | |
tree | 9fa54c710f73c5e08a9c8466e7a712eb63ee07ac /lib/sqfs/src/read_table.c | |
parent | 2182129c8f359c4fa1390eaba7a65b595ccd4182 (diff) |
Move library source into src sub-directory
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/sqfs/src/read_table.c')
-rw-r--r-- | lib/sqfs/src/read_table.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/lib/sqfs/src/read_table.c b/lib/sqfs/src/read_table.c new file mode 100644 index 0000000..c6a9bbe --- /dev/null +++ b/lib/sqfs/src/read_table.c @@ -0,0 +1,91 @@ +/* SPDX-License-Identifier: LGPL-3.0-or-later */ +/* + * read_table.c + * + * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at> + */ +#define SQFS_BUILDING_DLL +#include "config.h" + +#include "sqfs/meta_reader.h" +#include "sqfs/error.h" +#include "sqfs/table.h" +#include "sqfs/block.h" +#include "sqfs/io.h" +#include "util/util.h" + +#include <stdlib.h> + +int sqfs_read_table(sqfs_file_t *file, sqfs_compressor_t *cmp, + size_t table_size, sqfs_u64 location, sqfs_u64 lower_limit, + sqfs_u64 upper_limit, void **out) +{ + size_t diff, block_count, blk_idx = 0; + sqfs_u64 start, *locations; + sqfs_meta_reader_t *m; + void *data, *ptr; + int err; + + data = malloc(table_size); + if (data == NULL) + return SQFS_ERROR_ALLOC; + + /* restore list from image */ + block_count = table_size / SQFS_META_BLOCK_SIZE; + + if ((table_size % SQFS_META_BLOCK_SIZE) != 0) + ++block_count; + + locations = alloc_array(sizeof(sqfs_u64), block_count); + + if (locations == NULL) { + err = SQFS_ERROR_ALLOC; + goto fail_data; + } + + err = file->read_at(file, location, locations, + sizeof(sqfs_u64) * block_count); + if (err) + goto fail_idx; + + /* Read the actual data */ + m = sqfs_meta_reader_create(file, cmp, lower_limit, upper_limit); + if (m == NULL) { + err = SQFS_ERROR_ALLOC; + goto fail_idx; + } + + ptr = data; + + while (table_size > 0) { + start = le64toh(locations[blk_idx++]); + + err = sqfs_meta_reader_seek(m, start, 0); + if (err) + goto fail; + + diff = SQFS_META_BLOCK_SIZE; + if (diff > table_size) + diff = table_size; + + err = sqfs_meta_reader_read(m, ptr, diff); + if (err) + goto fail; + + ptr = (char *)ptr + diff; + table_size -= diff; + } + + sqfs_drop(m); + free(locations); + *out = data; + return 0; +fail: + sqfs_drop(m); +fail_idx: + free(locations); +fail_data: + free(data); + *out = NULL; + return err; +} |