Function reftable_block_init

reftable/block.c:227–350

}

int reftable_block_init(struct reftable_block *block,
			struct reftable_block_source *source,
			uint32_t offset, uint32_t header_size,
			uint32_t table_block_size, uint32_t hash_size,
			uint8_t want_type)
{
	uint32_t guess_block_size = table_block_size ?
		table_block_size : DEFAULT_BLOCK_SIZE;
	uint32_t full_block_size = table_block_size;
	uint16_t restart_count;
	uint32_t restart_off;
	uint32_t block_size;
	uint8_t block_type;
	int err;

	err = read_block(source, &block->block_data, offset, guess_block_size);
	if (err < 0)
		goto done;

	block_type = block->block_data.data[header_size];
	if (!reftable_is_block_type(block_type)) {
		err = REFTABLE_FORMAT_ERROR;
		goto done;
	}
	if (want_type != REFTABLE_BLOCK_TYPE_ANY && block_type != want_type) {
		err = 1;
		goto done;
	}

	block_size = reftable_get_be24(block->block_data.data + header_size + 1);
	if (block_size > guess_block_size) {
		err = read_block(source, &block->block_data, offset, block_size);
		if (err < 0)
			goto done;
	}

	if (block_type == REFTABLE_BLOCK_TYPE_LOG) {
		uint32_t block_header_skip = 4 + header_size;
		uLong dst_len = block_size - block_header_skip;
		uLong src_len = block->block_data.len - block_header_skip;

		/* Log blocks specify the *uncompressed* size in their header. */
		REFTABLE_ALLOC_GROW_OR_NULL(block->uncompressed_data, block_size,
					    block->uncompressed_cap);
		if (!block->uncompressed_data) {
			err = REFTABLE_OUT_OF_MEMORY_ERROR;
			goto done;
		}

		/* Copy over the block header verbatim. It's not compressed. */
		memcpy(block->uncompressed_data, block->block_data.data, block_header_skip);

		if (!block->zstream) {
			REFTABLE_CALLOC_ARRAY(block->zstream, 1);
			if (!block->zstream) {
				err = REFTABLE_OUT_OF_MEMORY_ERROR;
				goto done;
			}