static inline int dmg_read_chunk(BDRVDMGState *s,int 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; 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 { ret = pread(s->fd, s->compressed_chunk+i, s->lengths[chunk]-i, s->offsets[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 = pread(s->fd, s->uncompressed_chunk, s->lengths[chunk], s->offsets[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; }