From 8c5d2cbc8d285a2f094383b61184385da29b2952 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Mon, 15 Jun 2015 17:36:32 +0200 Subject: [PATCH] dictzip: Fix on big endian systems MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The dictzip code in SLE11 received some treatment over time to support running on big endian hosts. Somewhere in the transition to SLE12 this support got lost. Add it back in again from the SLE11 code base. Furthermore while at it, fix up the debug prints to not emit warnings. [AG: BSC#937572] Signed-off-by: Alexander Graf [AF: Rebased for v2.7.0-rc2] Signed-off-by: Andreas Färber --- block/dictzip.c | 50 ++++++++++++++++++++++++++++---------------------- 1 file changed, 28 insertions(+), 22 deletions(-) diff --git a/block/dictzip.c b/block/dictzip.c index 4b7e2db817..3235337164 100644 --- a/block/dictzip.c +++ b/block/dictzip.c @@ -156,6 +156,7 @@ static int dictzip_open(BlockDriverState *bs, QDict *options, int flags, Error * uint8_t header_flags; uint16_t chunk_len16; uint16_t chunk_cnt16; + uint32_t chunk_len32; uint16_t header_ver; uint16_t tmp_short; uint64_t offset; @@ -255,11 +256,11 @@ static int dictzip_open(BlockDriverState *bs, QDict *options, int flags, Error * break; case 99: /* Special Alex pigz version */ /* number of chunks */ - if (bdrv_pread(s->hd->file, GZ_99_CHUNKSIZE, &s->chunk_len, 4) != 4) + if (bdrv_pread(s->hd->file, GZ_99_CHUNKSIZE, &chunk_len32, 4) != 4) goto fail; - dprintf("chunk len [%#x] = %d\n", GZ_99_CHUNKSIZE, s->chunk_len); - s->chunk_len = le32_to_cpu(s->chunk_len); + dprintf("chunk len [%#x] = %d\n", GZ_99_CHUNKSIZE, chunk_len32); + s->chunk_len = le32_to_cpu(chunk_len32); /* chunk count */ if (bdrv_pread(s->hd->file, GZ_99_CHUNKCNT, &s->chunk_cnt, 4) != 4) @@ -267,7 +268,7 @@ static int dictzip_open(BlockDriverState *bs, QDict *options, int flags, Error * s->chunk_cnt = le32_to_cpu(s->chunk_cnt); - dprintf("chunk len | count = %d | %d\n", s->chunk_len, s->chunk_cnt); + dprintf("chunk len | count = %"PRId64" | %d\n", s->chunk_len, s->chunk_cnt); /* file size */ if (bdrv_pread(s->hd->file, GZ_99_FILESIZE, &s->file_len, 8) != 8) @@ -338,14 +339,14 @@ static int dictzip_open(BlockDriverState *bs, QDict *options, int flags, Error * s->offsets[i] = offset; switch (header_ver) { case 1: - offset += s->chunks[i]; + offset += le16_to_cpu(s->chunks[i]); break; case 99: - offset += s->chunks32[i]; + offset += le32_to_cpu(s->chunks32[i]); break; } - dprintf("chunk %#x - %#x = offset %#x -> %#x\n", i * s->chunk_len, (i+1) * s->chunk_len, s->offsets[i], offset); + dprintf("chunk %#"PRIx64" - %#"PRIx64" = offset %#"PRIx64" -> %#"PRIx64"\n", i * s->chunk_len, (i+1) * s->chunk_len, s->offsets[i], offset); } qemu_opts_del(opts); @@ -379,10 +380,26 @@ static void dictzip_read_cb(void *opaque, int ret) struct BDRVDictZipState *s = acb->s; uint8_t *buf; DictCache *cache; - int r; + int r, i; buf = g_malloc(acb->chunks_len); + /* try to find zlib stream for decoding */ + do { + for (i = 0; i < Z_STREAM_COUNT; i++) { + if (!(s->stream_in_use & (1 << i))) { + s->stream_in_use |= (1 << i); + acb->zStream_id = i; + acb->zStream = &s->zStream[i]; + break; + } + } + } while(!acb->zStream); + + /* sure, we could handle more streams, but this callback should be single + threaded and when it's not, we really want to know! */ + assert(i == 0); + /* uncompress the chunk */ acb->zStream->next_in = acb->gzipped; acb->zStream->avail_in = acb->gz_len; @@ -468,17 +485,6 @@ static BlockAIOCB *dictzip_aio_readv(BlockDriverState *bs, } /* No cache, so let's decode */ - do { - for (i = 0; i < Z_STREAM_COUNT; i++) { - if (!(s->stream_in_use & (1 << i))) { - s->stream_in_use |= (1 << i); - acb->zStream_id = i; - acb->zStream = &s->zStream[i]; - break; - } - } - } while(!acb->zStream); - /* We need to read these chunks */ first_chunk = start / s->chunk_len; first_offset = start - first_chunk * s->chunk_len; @@ -488,9 +494,9 @@ static BlockAIOCB *dictzip_aio_readv(BlockDriverState *bs, gz_len = 0; for (i = first_chunk; i <= last_chunk; i++) { if (s->chunks32) - gz_len += s->chunks32[i]; + gz_len += le32_to_cpu(s->chunks32[i]); else - gz_len += s->chunks[i]; + gz_len += le16_to_cpu(s->chunks[i]); } gz_sector_num = gz_start / SECTOR_SIZE; @@ -511,7 +517,7 @@ static BlockAIOCB *dictzip_aio_readv(BlockDriverState *bs, iov->iov_len = gz_nb_sectors * 512; qemu_iovec_init_external(qiov_gz, iov, 1); - dprintf("read %d - %d => %d - %d\n", start, end, gz_start, gz_start + gz_len); + dprintf("read %zd - %zd => %zd - %zd\n", start, end, gz_start, gz_start + gz_len); acb->s = s; acb->qiov = qiov;