diff options
Diffstat (limited to 'lib/sqfs')
| -rw-r--r-- | lib/sqfs/Makemodule.am | 2 | ||||
| -rw-r--r-- | lib/sqfs/xattr_writer.c | 301 |
2 files changed, 302 insertions, 1 deletions
diff --git a/lib/sqfs/Makemodule.am b/lib/sqfs/Makemodule.am index c44a85c..ad5c8af 100644 --- a/lib/sqfs/Makemodule.am +++ b/lib/sqfs/Makemodule.am @@ -16,7 +16,7 @@ libsquashfs_la_SOURCES += lib/sqfs/read_super.c lib/sqfs/meta_reader.c libsquashfs_la_SOURCES += lib/sqfs/read_inode.c lib/sqfs/write_inode.c libsquashfs_la_SOURCES += lib/sqfs/dir_writer.c lib/sqfs/xattr_reader.c libsquashfs_la_SOURCES += lib/sqfs/read_table.c lib/sqfs/comp/compressor.c -libsquashfs_la_SOURCES += lib/sqfs/comp/internal.h +libsquashfs_la_SOURCES += lib/sqfs/comp/internal.h lib/sqfs/xattr_writer.c libsquashfs_la_SOURCES += lib/sqfs/dir_reader.c lib/sqfs/read_tree.c libsquashfs_la_SOURCES += lib/sqfs/inode.c lib/sqfs/data_writer/fragment.c libsquashfs_la_SOURCES += lib/sqfs/data_writer/block.c diff --git a/lib/sqfs/xattr_writer.c b/lib/sqfs/xattr_writer.c new file mode 100644 index 0000000..7643d49 --- /dev/null +++ b/lib/sqfs/xattr_writer.c @@ -0,0 +1,301 @@ +/* SPDX-License-Identifier: LGPL-3.0-or-later */ +/* + * xattr_writer.c + * + * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at> + */ +#define SQFS_BUILDING_DLL +#include "config.h" + +#include "sqfs/xattr_writer.h" +#include "sqfs/meta_writer.h" +#include "sqfs/super.h" +#include "sqfs/xattr.h" +#include "sqfs/error.h" +#include "sqfs/block.h" +#include "sqfs/io.h" + +#include "str_table.h" +#include "util.h" + +#include <stdlib.h> +#include <string.h> + + +#define XATTR_KEY_BUCKETS 31 +#define XATTR_VALUE_BUCKETS 511 +#define XATTR_INITIAL_PAIR_CAP 128 + +#define MK_PAIR(key, value) (((sqfs_u64)(key) << 32UL) | (sqfs_u64)(value)) +#define GET_KEY(pair) ((pair >> 32UL) & 0x0FFFFFFFFUL) +#define GET_VALUE(pair) (pair & 0x0FFFFFFFFUL) + + +static const char *hexmap = "0123456789ABCDEF"; + +static char *to_base32(const void *input, size_t size) +{ + const uint8_t *in = input; + char *out, *ptr; + size_t i; + + out = malloc(2 * size + 1); + if (out == NULL) + return NULL; + + ptr = out; + + for (i = 0; i < size; ++i) { + *(ptr++) = hexmap[ in[i] & 0x0F]; + *(ptr++) = hexmap[(in[i] >> 4) & 0x0F]; + } + + *ptr = '\0'; + return out; +} + +static void *from_base32(const char *input, size_t *size_out) +{ + uint8_t lo, hi, *out, *ptr; + size_t len; + + len = strlen(input); + *size_out = len / 2; + + out = malloc(*size_out); + if (out == NULL) + return NULL; + + ptr = out; + + while (*input != '\0') { + lo = strchr(hexmap, *(input++)) - hexmap; + hi = strchr(hexmap, *(input++)) - hexmap; + + *(ptr++) = lo | (hi << 4); + } + + return out; +} + +static int compare_u64(const void *a, const void *b) +{ + sqfs_u64 lhs = *((const sqfs_u64 *)a); + sqfs_u64 rhs = *((const sqfs_u64 *)b); + + return (lhs < rhs ? -1 : (lhs > rhs ? 1 : 0)); +} + + + +typedef struct kv_block_desc_t { + struct kv_block_desc_t *next; + size_t start; + size_t count; +} kv_block_desc_t; + +struct sqfs_xattr_writer_t { + str_table_t keys; + str_table_t values; + + sqfs_u64 *kv_pairs; + size_t max_pairs; + size_t num_pairs; + + size_t kv_start; + + kv_block_desc_t *kv_blocks; + size_t num_blocks; +}; + + +sqfs_xattr_writer_t *sqfs_xattr_writer_create(void) +{ + sqfs_xattr_writer_t *xwr = calloc(1, sizeof(*xwr)); + + if (str_table_init(&xwr->keys, XATTR_KEY_BUCKETS)) + goto fail_keys; + + if (str_table_init(&xwr->values, XATTR_VALUE_BUCKETS)) + goto fail_values; + + xwr->max_pairs = XATTR_INITIAL_PAIR_CAP; + xwr->kv_pairs = alloc_array(sizeof(xwr->kv_pairs[0]), xwr->max_pairs); + + if (xwr->kv_pairs == NULL) + goto fail_pairs; + + return xwr; +fail_pairs: + str_table_cleanup(&xwr->values); +fail_values: + str_table_cleanup(&xwr->keys); +fail_keys: + free(xwr); + return NULL; +} + +void sqfs_xattr_writer_destroy(sqfs_xattr_writer_t *xwr) +{ + kv_block_desc_t *blk; + + while (xwr->kv_blocks != NULL) { + blk = xwr->kv_blocks; + xwr->kv_blocks = xwr->kv_blocks->next; + free(blk); + } + + free(xwr->kv_pairs); + str_table_cleanup(&xwr->values); + str_table_cleanup(&xwr->keys); + free(xwr); +} + +int sqfs_xattr_writer_begin(sqfs_xattr_writer_t *xwr) +{ + xwr->kv_start = xwr->num_pairs; + return 0; +} + +int sqfs_xattr_writer_add(sqfs_xattr_writer_t *xwr, const char *key, + const void *value, size_t size) +{ + size_t i, key_index, old_value_index, value_index, new_count; + sqfs_u64 kv_pair, *new; + char *value_str; + int err; + + if (!sqfs_has_xattr(key)) + return SQFS_ERROR_UNSUPPORTED; + + /* resolve key and value into unique, incremental IDs */ + err = str_table_get_index(&xwr->keys, key, &key_index); + if (err) + return err; + + value_str = to_base32(value, size); + if (value_str == NULL) + return SQFS_ERROR_ALLOC; + + err = str_table_get_index(&xwr->values, value_str, &value_index); + free(value_str); + if (err) + return err; + + str_table_add_ref(&xwr->values, value_index); + + if (sizeof(size_t) > sizeof(sqfs_u32)) { + if (key_index > 0x0FFFFFFFFUL || value_index > 0x0FFFFFFFFUL) + return SQFS_ERROR_OVERFLOW; + } + + /* bail if already have the pair, overwrite if we have the key */ + kv_pair = MK_PAIR(key_index, value_index); + + for (i = xwr->kv_start; i < xwr->num_pairs; ++i) { + if (xwr->kv_pairs[i] == kv_pair) + return 0; + + if (GET_KEY(xwr->kv_pairs[i]) == key_index) { + old_value_index = GET_VALUE(xwr->kv_pairs[i]); + + str_table_del_ref(&xwr->values, old_value_index); + + xwr->kv_pairs[i] = kv_pair; + return 0; + } + } + + /* append it to the list */ + if (xwr->max_pairs == xwr->num_pairs) { + new_count = xwr->max_pairs * 2; + new = realloc(xwr->kv_pairs, + sizeof(xwr->kv_pairs[0]) * new_count); + + if (new == NULL) + return SQFS_ERROR_ALLOC; + + xwr->kv_pairs = new; + xwr->max_pairs = new_count; + } + + xwr->kv_pairs[xwr->num_pairs++] = kv_pair; + return 0; +} + +int sqfs_xattr_writer_end(sqfs_xattr_writer_t *xwr, sqfs_u32 *out) +{ + kv_block_desc_t *blk, *blk_prev; + size_t i, count, value_idx; + sqfs_u32 index; + int ret; + + count = xwr->num_pairs - xwr->kv_start; + + qsort(xwr->kv_pairs + xwr->kv_start, count, + sizeof(xwr->kv_pairs[0]), compare_u64); + + blk_prev = NULL; + blk = xwr->kv_blocks; + index = 0; + + while (blk != NULL) { + if (blk->count == count) { + ret = memcmp(xwr->kv_pairs + blk->start, + xwr->kv_pairs + xwr->kv_start, + sizeof(xwr->kv_pairs[0]) * count); + + if (ret == 0) + break; + } + + if (index == 0xFFFFFFFF) + return SQFS_ERROR_OVERFLOW; + + ++index; + blk_prev = blk; + blk = blk->next; + } + + if (blk != NULL) { + for (i = 0; i < count; ++i) { + value_idx = GET_VALUE(xwr->kv_pairs[xwr->kv_start + i]); + str_table_del_ref(&xwr->values, value_idx); + + value_idx = GET_VALUE(xwr->kv_pairs[blk->start + i]); + str_table_add_ref(&xwr->values, value_idx); + } + + xwr->num_pairs = xwr->kv_start; + } else { + blk = calloc(1, sizeof(*blk)); + if (blk == NULL) + return SQFS_ERROR_ALLOC; + + blk->start = xwr->kv_start; + blk->count = count; + + if (blk_prev == NULL) { + xwr->kv_blocks = blk; + } else { + blk_prev->next = blk; + } + + xwr->num_blocks += 1; + } + + *out = index; + return 0; +} + +/*****************************************************************************/ + +int sqfs_xattr_writer_flush(sqfs_xattr_writer_t *xwr, sqfs_file_t *file, + sqfs_super_t *super, sqfs_compressor_t *cmp) +{ + (void)xwr; + (void)file; + (void)super; + (void)cmp; + return 0; +} |