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;
}
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;
}