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-rw-r--r--block/cloop.c115
1 files changed, 63 insertions, 52 deletions
diff --git a/block/cloop.c b/block/cloop.c
index 775f8a98e1..799b6c2125 100644
--- a/block/cloop.c
+++ b/block/cloop.c
@@ -30,7 +30,7 @@ typedef struct BDRVCloopState {
CoMutex lock;
uint32_t block_size;
uint32_t n_blocks;
- uint64_t* offsets;
+ uint64_t *offsets;
uint32_t sectors_per_block;
uint32_t current_block;
uint8_t *compressed_block;
@@ -40,21 +40,23 @@ typedef struct BDRVCloopState {
static int cloop_probe(const uint8_t *buf, int buf_size, const char *filename)
{
- const char* magic_version_2_0="#!/bin/sh\n"
- "#V2.0 Format\n"
- "modprobe cloop file=$0 && mount -r -t iso9660 /dev/cloop $1\n";
- int length=strlen(magic_version_2_0);
- if(length>buf_size)
- length=buf_size;
- if(!memcmp(magic_version_2_0,buf,length))
- return 2;
+ const char *magic_version_2_0 = "#!/bin/sh\n"
+ "#V2.0 Format\n"
+ "modprobe cloop file=$0 && mount -r -t iso9660 /dev/cloop $1\n";
+ int length = strlen(magic_version_2_0);
+ if (length > buf_size) {
+ length = buf_size;
+ }
+ if (!memcmp(magic_version_2_0, buf, length)) {
+ return 2;
+ }
return 0;
}
static int cloop_open(BlockDriverState *bs, int flags)
{
BDRVCloopState *s = bs->opaque;
- uint32_t offsets_size,max_compressed_block_size=1,i;
+ uint32_t offsets_size, max_compressed_block_size = 1, i;
bs->read_only = 1;
@@ -74,26 +76,28 @@ static int cloop_open(BlockDriverState *bs, int flags)
s->offsets = g_malloc(offsets_size);
if (bdrv_pread(bs->file, 128 + 4 + 4, s->offsets, offsets_size) <
offsets_size) {
- goto cloop_close;
+ goto cloop_close;
}
for(i=0;i<s->n_blocks;i++) {
- s->offsets[i]=be64_to_cpu(s->offsets[i]);
- if(i>0) {
- uint32_t size=s->offsets[i]-s->offsets[i-1];
- if(size>max_compressed_block_size)
- max_compressed_block_size=size;
- }
+ s->offsets[i] = be64_to_cpu(s->offsets[i]);
+ if (i > 0) {
+ uint32_t size = s->offsets[i] - s->offsets[i - 1];
+ if (size > max_compressed_block_size) {
+ max_compressed_block_size = size;
+ }
+ }
}
/* initialize zlib engine */
- s->compressed_block = g_malloc(max_compressed_block_size+1);
+ s->compressed_block = g_malloc(max_compressed_block_size + 1);
s->uncompressed_block = g_malloc(s->block_size);
- if(inflateInit(&s->zstream) != Z_OK)
- goto cloop_close;
- s->current_block=s->n_blocks;
+ if (inflateInit(&s->zstream) != Z_OK) {
+ goto cloop_close;
+ }
+ s->current_block = s->n_blocks;
s->sectors_per_block = s->block_size/512;
- bs->total_sectors = s->n_blocks*s->sectors_per_block;
+ bs->total_sectors = s->n_blocks * s->sectors_per_block;
qemu_co_mutex_init(&s->lock);
return 0;
@@ -105,27 +109,30 @@ static inline int cloop_read_block(BlockDriverState *bs, int block_num)
{
BDRVCloopState *s = bs->opaque;
- if(s->current_block != block_num) {
- int ret;
- uint32_t bytes = s->offsets[block_num+1]-s->offsets[block_num];
+ if (s->current_block != block_num) {
+ int ret;
+ uint32_t bytes = s->offsets[block_num + 1] - s->offsets[block_num];
ret = bdrv_pread(bs->file, s->offsets[block_num], s->compressed_block,
bytes);
- if (ret != bytes)
+ if (ret != bytes) {
return -1;
+ }
+
+ s->zstream.next_in = s->compressed_block;
+ s->zstream.avail_in = bytes;
+ s->zstream.next_out = s->uncompressed_block;
+ s->zstream.avail_out = s->block_size;
+ ret = inflateReset(&s->zstream);
+ if (ret != Z_OK) {
+ return -1;
+ }
+ ret = inflate(&s->zstream, Z_FINISH);
+ if (ret != Z_STREAM_END || s->zstream.total_out != s->block_size) {
+ return -1;
+ }
- s->zstream.next_in = s->compressed_block;
- s->zstream.avail_in = bytes;
- s->zstream.next_out = s->uncompressed_block;
- s->zstream.avail_out = s->block_size;
- ret = inflateReset(&s->zstream);
- if(ret != Z_OK)
- return -1;
- ret = inflate(&s->zstream, Z_FINISH);
- if(ret != Z_STREAM_END || s->zstream.total_out != s->block_size)
- return -1;
-
- s->current_block = block_num;
+ s->current_block = block_num;
}
return 0;
}
@@ -136,12 +143,15 @@ static int cloop_read(BlockDriverState *bs, int64_t sector_num,
BDRVCloopState *s = bs->opaque;
int i;
- for(i=0;i<nb_sectors;i++) {
- uint32_t sector_offset_in_block=((sector_num+i)%s->sectors_per_block),
- block_num=(sector_num+i)/s->sectors_per_block;
- if(cloop_read_block(bs, block_num) != 0)
- return -1;
- memcpy(buf+i*512,s->uncompressed_block+sector_offset_in_block*512,512);
+ for (i = 0; i < nb_sectors; i++) {
+ uint32_t sector_offset_in_block =
+ ((sector_num + i) % s->sectors_per_block),
+ block_num = (sector_num + i) / s->sectors_per_block;
+ if (cloop_read_block(bs, block_num) != 0) {
+ return -1;
+ }
+ memcpy(buf + i * 512,
+ s->uncompressed_block + sector_offset_in_block * 512, 512);
}
return 0;
}
@@ -160,20 +170,21 @@ static coroutine_fn int cloop_co_read(BlockDriverState *bs, int64_t sector_num,
static void cloop_close(BlockDriverState *bs)
{
BDRVCloopState *s = bs->opaque;
- if(s->n_blocks>0)
- free(s->offsets);
+ if (s->n_blocks > 0) {
+ free(s->offsets);
+ }
free(s->compressed_block);
free(s->uncompressed_block);
inflateEnd(&s->zstream);
}
static BlockDriver bdrv_cloop = {
- .format_name = "cloop",
- .instance_size = sizeof(BDRVCloopState),
- .bdrv_probe = cloop_probe,
- .bdrv_open = cloop_open,
- .bdrv_read = cloop_co_read,
- .bdrv_close = cloop_close,
+ .format_name = "cloop",
+ .instance_size = sizeof(BDRVCloopState),
+ .bdrv_probe = cloop_probe,
+ .bdrv_open = cloop_open,
+ .bdrv_read = cloop_co_read,
+ .bdrv_close = cloop_close,
};
static void bdrv_cloop_init(void)
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-02 06:07:14 +0000