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dmg: including dmg-lzfse module inside dmg block driver.

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This commit includes the support to new module dmg-lzfse into dmg block
driver. It includes the support for block type ULFO (0x80000007).

Signed-off-by: Julio Faracco <jcfaracco@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Julio Faracco 2018-11-05 13:08:05 -02:00 committed by Kevin Wolf
parent 83bc1f9768
commit 7a40b418ec
2 changed files with 31 additions and 0 deletions
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28
block/dmg.c
View File

@ -33,6 +33,9 @@
int (*dmg_uncompress_bz2)(char *next_in, unsigned int avail_in,
char *next_out, unsigned int avail_out);
int (*dmg_uncompress_lzfse)(char *next_in, unsigned int avail_in,
char *next_out, unsigned int avail_out);
enum {
/* Limit chunk sizes to prevent unreasonable amounts of memory being used
* or truncating when converting to 32-bit types
@ -107,6 +110,7 @@ static void update_max_chunk_size(BDRVDMGState *s, uint32_t chunk,
switch (s->types[chunk]) {
case 0x80000005: /* zlib compressed */
case 0x80000006: /* bzip2 compressed */
case 0x80000007: /* lzfse compressed */
compressed_size = s->lengths[chunk];
uncompressed_sectors = s->sectorcounts[chunk];
break;
@ -188,6 +192,8 @@ static bool dmg_is_known_block_type(uint32_t entry_type)
return true;
case 0x80000006: /* bzip2 */
return !!dmg_uncompress_bz2;
case 0x80000007: /* lzfse */
return !!dmg_uncompress_lzfse;
default:
return false;
}
@ -425,6 +431,7 @@ static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
}
block_module_load_one("dmg-bz2");
block_module_load_one("dmg-lzfse");
s->n_chunks = 0;
s->offsets = s->lengths = s->sectors = s->sectorcounts = NULL;
@ -623,6 +630,27 @@ static inline int dmg_read_chunk(BlockDriverState *bs, uint64_t sector_num)
return ret;
}
break;
case 0x80000007:
if (!dmg_uncompress_lzfse) {
break;
}
/* we need to buffer, because only the chunk as whole can be
* inflated. */
ret = bdrv_pread(bs->file, s->offsets[chunk],
s->compressed_chunk, s->lengths[chunk]);
if (ret != s->lengths[chunk]) {
return -1;
}
ret = dmg_uncompress_lzfse((char *)s->compressed_chunk,
(unsigned int) s->lengths[chunk],
(char *)s->uncompressed_chunk,
(unsigned int)
(512 * s->sectorcounts[chunk]));
if (ret < 0) {
return ret;
}
break;
case 1: /* copy */
ret = bdrv_pread(bs->file, s->offsets[chunk],
s->uncompressed_chunk, s->lengths[chunk]);

3
block/dmg.h
View File

@ -55,4 +55,7 @@ typedef struct BDRVDMGState {
extern int (*dmg_uncompress_bz2)(char *next_in, unsigned int avail_in,
char *next_out, unsigned int avail_out);
extern int (*dmg_uncompress_lzfse)(char *next_in, unsigned int avail_in,
char *next_out, unsigned int avail_out);
#endif