C++ (Cpp) sparse_file_add_fill Examples

Example #1

File: sparse_read.cpp Project: BenzoRoms/system_core

static int sparse_file_read_normal(struct sparse_file *s, int fd)
{
	int ret;
	uint32_t *buf = (uint32_t *)malloc(s->block_size);
	unsigned int block = 0;
	int64_t remain = s->len;
	int64_t offset = 0;
	unsigned int to_read;
	unsigned int i;
	bool sparse_block;

	if (!buf) {
		return -ENOMEM;
	}

	while (remain > 0) {
		to_read = std::min(remain, (int64_t)(s->block_size));
		ret = read_all(fd, buf, to_read);
		if (ret < 0) {
			error("failed to read sparse file");
			free(buf);
			return ret;
		}

		if (to_read == s->block_size) {
			sparse_block = true;
			for (i = 1; i < s->block_size / sizeof(uint32_t); i++) {
				if (buf[0] != buf[i]) {
					sparse_block = false;
					break;
				}
			}
		} else {
			sparse_block = false;
		}

		if (sparse_block) {
			/* TODO: add flag to use skip instead of fill for buf[0] == 0 */
			sparse_file_add_fill(s, buf[0], to_read, block);
		} else {
			sparse_file_add_fd(s, fd, offset, to_read, block);
		}

		remain -= to_read;
		offset += to_read;
		block++;
	}

	free(buf);
	return 0;
}

Example #2

File: sparse_read.c Project: LedoInteractive/platform_system_core

static int process_fill_chunk(struct sparse_file *s, unsigned int chunk_size,
		int fd, unsigned int blocks, unsigned int block, uint32_t *crc32)
{
	int ret;
	int chunk;
	int64_t len = (int64_t)blocks * s->block_size;
	uint32_t fill_val;
	uint32_t *fillbuf;
	unsigned int i;

	if (chunk_size != sizeof(fill_val)) {
		return -EINVAL;
	}

	ret = read_all(fd, &fill_val, sizeof(fill_val));
	if (ret < 0) {
		return ret;
	}

	ret = sparse_file_add_fill(s, fill_val, len, block);
	if (ret < 0) {
		return ret;
	}

	if (crc32) {
		/* Fill copy_buf with the fill value */
		fillbuf = (uint32_t *)copybuf;
		for (i = 0; i < (COPY_BUF_SIZE / sizeof(fill_val)); i++) {
			fillbuf[i] = fill_val;
		}

		while (len) {
			chunk = min(len, COPY_BUF_SIZE);
			*crc32 = sparse_crc32(*crc32, copybuf, chunk);
			len -= chunk;
		}
	}

	return 0;
}