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dmg: fix reading of uncompressed chunks
When dmg_read_chunk encounters an uncompressed chunk it currently calls read without any previous adjustment of the file postion. This seems very wrong, and the "reference" implementation in dmg2img does a search to the same offset as done in the various compression cases, so do the same here. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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@ -239,7 +239,8 @@ static inline int dmg_read_chunk(BDRVDMGState *s,int sector_num)
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return -1;
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break; }
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case 1: /* copy */
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ret = read(s->fd, s->uncompressed_chunk, s->lengths[chunk]);
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ret = pread(s->fd, s->uncompressed_chunk, s->lengths[chunk],
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s->offsets[chunk]);
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if (ret != s->lengths[chunk])
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return -1;
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break;
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