Function reftable_table_new

reftable/table.c:520–596

}

int reftable_table_new(struct reftable_table **out,
		       struct reftable_block_source *source, char const *name)
{
	struct reftable_block_data footer = { 0 };
	struct reftable_block_data header = { 0 };
	struct reftable_table *t;
	uint64_t file_size = block_source_size(source);
	uint32_t read_size;
	ssize_t bytes_read;
	int err;

	REFTABLE_CALLOC_ARRAY(t, 1);
	if (!t) {
		err = REFTABLE_OUT_OF_MEMORY_ERROR;
		goto done;
	}

	/*
	 * We need one extra byte to read the type of first block. We also
	 * pretend to always be reading v2 of the format because it is larger.
	 */
	read_size = header_size(2) + 1;
	if (read_size > file_size) {
		err = REFTABLE_FORMAT_ERROR;
		goto done;
	}

	bytes_read = block_source_read_data(source, &header, 0, read_size);
	if (bytes_read < 0 || (size_t)bytes_read != read_size) {
		err = REFTABLE_IO_ERROR;
		goto done;
	}

	if (memcmp(header.data, "REFT", 4)) {
		err = REFTABLE_FORMAT_ERROR;
		goto done;
	}
	t->version = header.data[4];
	if (t->version != 1 && t->version != 2) {
		err = REFTABLE_FORMAT_ERROR;
		goto done;
	}

	t->size = file_size - footer_size(t->version);
	t->source = *source;
	t->name = reftable_strdup(name);
	if (!t->name) {
		err = REFTABLE_OUT_OF_MEMORY_ERROR;
		goto done;
	}
	t->hash_id = 0;
	t->refcount = 1;

	bytes_read = block_source_read_data(source, &footer, t->size,
					    footer_size(t->version));
	if (bytes_read < 0 || (size_t)bytes_read != footer_size(t->version)) {
		err = REFTABLE_IO_ERROR;
		goto done;