diff options
| -rw-r--r-- | block/dmg.c | 60 |
1 files changed, 30 insertions, 30 deletions
diff --git a/block/dmg.c b/block/dmg.c index 04bae72..4f56227 100644 --- a/block/dmg.c +++ b/block/dmg.c @@ -100,6 +100,16 @@ static int read_uint32(BlockDriverState *bs, int64_t offset, uint32_t *result) return 0; } +static inline uint64_t buff_read_uint64(const uint8_t *buffer, int64_t offset) +{ + return be64_to_cpu(*(uint64_t *)&buffer[offset]); +} + +static inline uint32_t buff_read_uint32(const uint8_t *buffer, int64_t offset) +{ + return be32_to_cpu(*(uint32_t *)&buffer[offset]); +} + /* Increase max chunk sizes, if necessary. This function is used to calculate * the buffer sizes needed for compressed/uncompressed chunk I/O. */ @@ -182,20 +192,16 @@ typedef struct DmgHeaderState { uint32_t max_sectors_per_chunk; } DmgHeaderState; -static int dmg_read_mish_block(BlockDriverState *bs, DmgHeaderState *ds, - int64_t offset, uint32_t count) +static int dmg_read_mish_block(BDRVDMGState *s, DmgHeaderState *ds, + uint8_t *buffer, uint32_t count) { - BDRVDMGState *s = bs->opaque; uint32_t type, i; int ret; size_t new_size; uint32_t chunk_count; + int64_t offset = 0; - ret = read_uint32(bs, offset, &type); - if (ret < 0) { - goto fail; - } - + type = buff_read_uint32(buffer, offset); /* skip data that is not a valid MISH block (invalid magic or too small) */ if (type != 0x6d697368 || count < 244) { /* assume success for now */ @@ -214,10 +220,7 @@ static int dmg_read_mish_block(BlockDriverState *bs, DmgHeaderState *ds, 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; - } + s->types[i] = buff_read_uint32(buffer, offset); offset += 4; if (s->types[i] != 0x80000005 && s->types[i] != 1 && s->types[i] != 2) { @@ -233,17 +236,11 @@ static int dmg_read_mish_block(BlockDriverState *bs, DmgHeaderState *ds, } offset += 4; - ret = read_uint64(bs, offset, &s->sectors[i]); - if (ret < 0) { - goto fail; - } + s->sectors[i] = buff_read_uint64(buffer, offset); s->sectors[i] += ds->last_out_offset; offset += 8; - ret = read_uint64(bs, offset, &s->sectorcounts[i]); - if (ret < 0) { - goto fail; - } + s->sectorcounts[i] = buff_read_uint64(buffer, offset); offset += 8; if (s->sectorcounts[i] > DMG_SECTORCOUNTS_MAX) { @@ -254,17 +251,11 @@ static int dmg_read_mish_block(BlockDriverState *bs, DmgHeaderState *ds, goto fail; } - ret = read_uint64(bs, offset, &s->offsets[i]); - if (ret < 0) { - goto fail; - } + s->offsets[i] = buff_read_uint64(buffer, offset); s->offsets[i] += ds->last_in_offset; offset += 8; - ret = read_uint64(bs, offset, &s->lengths[i]); - if (ret < 0) { - goto fail; - } + s->lengths[i] = buff_read_uint64(buffer, offset); offset += 8; if (s->lengths[i] > DMG_LENGTHS_MAX) { @@ -288,8 +279,10 @@ fail: static int dmg_read_resource_fork(BlockDriverState *bs, DmgHeaderState *ds, uint64_t info_begin, uint64_t info_length) { + BDRVDMGState *s = bs->opaque; int ret; uint32_t count, rsrc_data_offset; + uint8_t *buffer = NULL; uint64_t info_end; uint64_t offset; @@ -330,16 +323,23 @@ static int dmg_read_resource_fork(BlockDriverState *bs, DmgHeaderState *ds, } offset += 4; - ret = dmg_read_mish_block(bs, ds, offset, count); + buffer = g_realloc(buffer, count); + ret = bdrv_pread(bs->file, offset, buffer, count); + if (ret < 0) { + goto fail; + } + + ret = dmg_read_mish_block(s, ds, buffer, count); if (ret < 0) { goto fail; } /* advance offset by size of resource */ offset += count; } - return 0; + ret = 0; fail: + g_free(buffer); return ret; } |