1 files changed, 61 insertions, 0 deletions
diff --git a/block/dmg-bz2.c b/block/dmg-bz2.c
new file mode 100644
index 0000000000..9059492a9f
--- /dev/null
+++ b/block/dmg-bz2.c
@@ -0,0 +1,61 @@
+/*
+ * DMG bzip2 uncompression
+ *
+ * Copyright (c) 2004 Johannes E. Schindelin
+ * Copyright (c) 2016 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "dmg.h"
+#include <bzlib.h>
+
+static int dmg_uncompress_bz2_do(char *next_in, unsigned int avail_in,
+                                 char *next_out, unsigned int avail_out)
+{
+    int ret;
+    uint64_t total_out;
+    bz_stream bzstream = {};
+
+    ret = BZ2_bzDecompressInit(&bzstream, 0, 0);
+    if (ret != BZ_OK) {
+        return -1;
+    }
+    bzstream.next_in = next_in;
+    bzstream.avail_in = avail_in;
+    bzstream.next_out = next_out;
+    bzstream.avail_out = avail_out;
+    ret = BZ2_bzDecompress(&bzstream);
+    total_out = ((uint64_t)bzstream.total_out_hi32 << 32) +
+                bzstream.total_out_lo32;
+    BZ2_bzDecompressEnd(&bzstream);
+    if (ret != BZ_STREAM_END ||
+        total_out != avail_out) {
+        return -1;
+    }
+    return 0;
+}
+
+__attribute__((constructor))
+static void dmg_bz2_init(void)
+{
+    assert(!dmg_uncompress_bz2);
+    dmg_uncompress_bz2 = dmg_uncompress_bz2_do;
+}