qemu/0038-dictzip-Fix-on-big-endian-systems.patch

From 368cb4908724b4e855cb9bda37cb04284a39b116 Mon Sep 17 00:00:00 2001
From: Alexander Graf <agraf@suse.de>
Date: Mon, 15 Jun 2015 17:36:32 +0200
Subject: [PATCH] dictzip: Fix on big endian systems
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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 <agraf@suse.de>
Signed-off-by: Andreas Färber <afaerber@suse.de>
---
 block/dictzip.c | 50 ++++++++++++++++++++++++++++----------------------
 1 file changed, 28 insertions(+), 22 deletions(-)

diff --git a/block/dictzip.c b/block/dictzip.c
index 717a7d3..1a104ac 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, GZ_99_CHUNKSIZE, &s->chunk_len, 4) != 4)
+            if (bdrv_pread(s->hd, 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, 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, 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;