aboutsummaryrefslogtreecommitdiff
path: root/block/dmg.c
diff options
context:
space:
mode:
Diffstat (limited to 'block/dmg.c')
-rw-r--r--block/dmg.c224
1 files changed, 120 insertions, 104 deletions
diff --git a/block/dmg.c b/block/dmg.c
index d5e9b1ff01..be2f26e85e 100644
--- a/block/dmg.c
+++ b/block/dmg.c
@@ -96,9 +96,9 @@ static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVDMGState *s = bs->opaque;
- uint64_t info_begin,info_end,last_in_offset,last_out_offset;
+ uint64_t info_begin, info_end, last_in_offset, last_out_offset;
uint32_t count, tmp;
- uint32_t max_compressed_size=1,max_sectors_per_chunk=1,i;
+ uint32_t max_compressed_size = 1, max_sectors_per_chunk = 1, i;
int64_t offset;
int ret;
@@ -160,37 +160,39 @@ static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
goto fail;
}
- if (type == 0x6d697368 && count >= 244) {
- int new_size, chunk_count;
+ if (type == 0x6d697368 && count >= 244) {
+ int new_size, chunk_count;
offset += 4;
offset += 200;
- chunk_count = (count-204)/40;
- new_size = sizeof(uint64_t) * (s->n_chunks + chunk_count);
- s->types = g_realloc(s->types, new_size/2);
- s->offsets = g_realloc(s->offsets, new_size);
- s->lengths = g_realloc(s->lengths, new_size);
- s->sectors = g_realloc(s->sectors, new_size);
- s->sectorcounts = g_realloc(s->sectorcounts, new_size);
+ chunk_count = (count - 204) / 40;
+ new_size = sizeof(uint64_t) * (s->n_chunks + chunk_count);
+ s->types = g_realloc(s->types, new_size / 2);
+ s->offsets = g_realloc(s->offsets, new_size);
+ s->lengths = g_realloc(s->lengths, new_size);
+ s->sectors = g_realloc(s->sectors, new_size);
+ s->sectorcounts = g_realloc(s->sectorcounts, new_size);
for (i = s->n_chunks; i < s->n_chunks + chunk_count; i++) {
ret = read_uint32(bs, offset, &s->types[i]);
if (ret < 0) {
goto fail;
}
- offset += 4;
- if(s->types[i]!=0x80000005 && s->types[i]!=1 && s->types[i]!=2) {
- if(s->types[i]==0xffffffff) {
- last_in_offset = s->offsets[i-1]+s->lengths[i-1];
- last_out_offset = s->sectors[i-1]+s->sectorcounts[i-1];
- }
- chunk_count--;
- i--;
- offset += 36;
- continue;
- }
- offset += 4;
+ offset += 4;
+ if (s->types[i] != 0x80000005 && s->types[i] != 1 &&
+ s->types[i] != 2) {
+ if (s->types[i] == 0xffffffff) {
+ last_in_offset = s->offsets[i - 1] + s->lengths[i - 1];
+ last_out_offset = s->sectors[i - 1] +
+ s->sectorcounts[i - 1];
+ }
+ chunk_count--;
+ i--;
+ offset += 36;
+ continue;
+ }
+ offset += 4;
ret = read_uint64(bs, offset, &s->sectors[i]);
if (ret < 0) {
@@ -218,19 +220,21 @@ static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
}
offset += 8;
- if(s->lengths[i]>max_compressed_size)
- max_compressed_size = s->lengths[i];
- if(s->sectorcounts[i]>max_sectors_per_chunk)
- max_sectors_per_chunk = s->sectorcounts[i];
- }
- s->n_chunks+=chunk_count;
- }
+ if (s->lengths[i] > max_compressed_size) {
+ max_compressed_size = s->lengths[i];
+ }
+ if (s->sectorcounts[i] > max_sectors_per_chunk) {
+ max_sectors_per_chunk = s->sectorcounts[i];
+ }
+ }
+ s->n_chunks += chunk_count;
+ }
}
/* initialize zlib engine */
- s->compressed_chunk = g_malloc(max_compressed_size+1);
- s->uncompressed_chunk = g_malloc(512*max_sectors_per_chunk);
- if(inflateInit(&s->zstream) != Z_OK) {
+ s->compressed_chunk = g_malloc(max_compressed_size + 1);
+ s->uncompressed_chunk = g_malloc(512 * max_sectors_per_chunk);
+ if (inflateInit(&s->zstream) != Z_OK) {
ret = -EINVAL;
goto fail;
}
@@ -252,27 +256,29 @@ fail:
}
static inline int is_sector_in_chunk(BDRVDMGState* s,
- uint32_t chunk_num,int sector_num)
+ uint32_t chunk_num, int sector_num)
{
- if(chunk_num>=s->n_chunks || s->sectors[chunk_num]>sector_num ||
- s->sectors[chunk_num]+s->sectorcounts[chunk_num]<=sector_num)
- return 0;
- else
- return -1;
+ if (chunk_num >= s->n_chunks || s->sectors[chunk_num] > sector_num ||
+ s->sectors[chunk_num] + s->sectorcounts[chunk_num] <= sector_num) {
+ return 0;
+ } else {
+ return -1;
+ }
}
-static inline uint32_t search_chunk(BDRVDMGState* s,int sector_num)
+static inline uint32_t search_chunk(BDRVDMGState *s, int sector_num)
{
/* binary search */
- uint32_t chunk1=0,chunk2=s->n_chunks,chunk3;
- while(chunk1!=chunk2) {
- chunk3 = (chunk1+chunk2)/2;
- if(s->sectors[chunk3]>sector_num)
- chunk2 = chunk3;
- else if(s->sectors[chunk3]+s->sectorcounts[chunk3]>sector_num)
- return chunk3;
- else
- chunk1 = chunk3;
+ uint32_t chunk1 = 0, chunk2 = s->n_chunks, chunk3;
+ while (chunk1 != chunk2) {
+ chunk3 = (chunk1 + chunk2) / 2;
+ if (s->sectors[chunk3] > sector_num) {
+ chunk2 = chunk3;
+ } else if (s->sectors[chunk3] + s->sectorcounts[chunk3] > sector_num) {
+ return chunk3;
+ } else {
+ chunk1 = chunk3;
+ }
}
return s->n_chunks; /* error */
}
@@ -281,54 +287,62 @@ static inline int dmg_read_chunk(BlockDriverState *bs, int sector_num)
{
BDRVDMGState *s = bs->opaque;
- if(!is_sector_in_chunk(s,s->current_chunk,sector_num)) {
- int ret;
- uint32_t chunk = search_chunk(s,sector_num);
+ if (!is_sector_in_chunk(s, s->current_chunk, sector_num)) {
+ int ret;
+ uint32_t chunk = search_chunk(s, sector_num);
- if(chunk>=s->n_chunks)
- return -1;
+ if (chunk >= s->n_chunks) {
+ return -1;
+ }
- s->current_chunk = s->n_chunks;
- switch(s->types[chunk]) {
- case 0x80000005: { /* zlib compressed */
- int i;
+ s->current_chunk = s->n_chunks;
+ switch (s->types[chunk]) {
+ case 0x80000005: { /* zlib compressed */
+ int i;
- /* we need to buffer, because only the chunk as whole can be
- * inflated. */
- i=0;
- do {
+ /* we need to buffer, because only the chunk as whole can be
+ * inflated. */
+ i = 0;
+ do {
ret = bdrv_pread(bs->file, s->offsets[chunk] + i,
- s->compressed_chunk+i, s->lengths[chunk]-i);
- if(ret<0 && errno==EINTR)
- ret=0;
- i+=ret;
- } while(ret>=0 && ret+i<s->lengths[chunk]);
-
- if (ret != s->lengths[chunk])
- return -1;
-
- s->zstream.next_in = s->compressed_chunk;
- s->zstream.avail_in = s->lengths[chunk];
- s->zstream.next_out = s->uncompressed_chunk;
- s->zstream.avail_out = 512*s->sectorcounts[chunk];
- 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 != 512*s->sectorcounts[chunk])
- return -1;
- break; }
- case 1: /* copy */
- ret = bdrv_pread(bs->file, s->offsets[chunk],
+ s->compressed_chunk + i,
+ s->lengths[chunk] - i);
+ if (ret < 0 && errno == EINTR) {
+ ret = 0;
+ }
+ i += ret;
+ } while (ret >= 0 && ret + i < s->lengths[chunk]);
+
+ if (ret != s->lengths[chunk]) {
+ return -1;
+ }
+
+ s->zstream.next_in = s->compressed_chunk;
+ s->zstream.avail_in = s->lengths[chunk];
+ s->zstream.next_out = s->uncompressed_chunk;
+ s->zstream.avail_out = 512 * s->sectorcounts[chunk];
+ 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 != 512 * s->sectorcounts[chunk]) {
+ return -1;
+ }
+ break; }
+ case 1: /* copy */
+ ret = bdrv_pread(bs->file, s->offsets[chunk],
s->uncompressed_chunk, s->lengths[chunk]);
- if (ret != s->lengths[chunk])
- return -1;
- break;
- case 2: /* zero */
- memset(s->uncompressed_chunk, 0, 512*s->sectorcounts[chunk]);
- break;
- }
- s->current_chunk = chunk;
+ if (ret != s->lengths[chunk]) {
+ return -1;
+ }
+ break;
+ case 2: /* zero */
+ memset(s->uncompressed_chunk, 0, 512 * s->sectorcounts[chunk]);
+ break;
+ }
+ s->current_chunk = chunk;
}
return 0;
}
@@ -339,12 +353,14 @@ static int dmg_read(BlockDriverState *bs, int64_t sector_num,
BDRVDMGState *s = bs->opaque;
int i;
- for(i=0;i<nb_sectors;i++) {
- uint32_t sector_offset_in_chunk;
- if(dmg_read_chunk(bs, sector_num+i) != 0)
- return -1;
- sector_offset_in_chunk = sector_num+i-s->sectors[s->current_chunk];
- memcpy(buf+i*512,s->uncompressed_chunk+sector_offset_in_chunk*512,512);
+ for (i = 0; i < nb_sectors; i++) {
+ uint32_t sector_offset_in_chunk;
+ if (dmg_read_chunk(bs, sector_num + i) != 0) {
+ return -1;
+ }
+ sector_offset_in_chunk = sector_num + i - s->sectors[s->current_chunk];
+ memcpy(buf + i * 512,
+ s->uncompressed_chunk + sector_offset_in_chunk * 512, 512);
}
return 0;
}
@@ -376,12 +392,12 @@ static void dmg_close(BlockDriverState *bs)
}
static BlockDriver bdrv_dmg = {
- .format_name = "dmg",
- .instance_size = sizeof(BDRVDMGState),
- .bdrv_probe = dmg_probe,
- .bdrv_open = dmg_open,
- .bdrv_read = dmg_co_read,
- .bdrv_close = dmg_close,
+ .format_name = "dmg",
+ .instance_size = sizeof(BDRVDMGState),
+ .bdrv_probe = dmg_probe,
+ .bdrv_open = dmg_open,
+ .bdrv_read = dmg_co_read,
+ .bdrv_close = dmg_close,
};
static void bdrv_dmg_init(void)
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-19 14:29:21 +0000