From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 erts/emulator/beam/erl_zlib.c | 113 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 erts/emulator/beam/erl_zlib.c

(limited to 'erts/emulator/beam/erl_zlib.c')

diff --git a/erts/emulator/beam/erl_zlib.c b/erts/emulator/beam/erl_zlib.c
new file mode 100644
index 0000000000..f73d48b6c2
--- /dev/null
+++ b/erts/emulator/beam/erl_zlib.c
@@ -0,0 +1,113 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 2009. All Rights Reserved.
+ * 
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ * 
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * %CopyrightEnd%
+ */
+
+/* A sparse wrapper around zlib with erts memory allocation.
+ *
+ * erl_zlib_compress2 and erl_zlib_uncompress are erts-adapted versions
+ * of the original compress2 and uncompress from zlib-1.2.3. 
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include "erl_zlib.h"
+
+#include "sys.h"
+#include "erl_alloc.h"
+
+voidpf erl_zlib_zalloc_callback (voidpf opaque, unsigned items, unsigned size)
+{
+    (void) opaque; /* make compiler happy */
+    return erts_alloc_fnf(ERTS_ALC_T_ZLIB, items * size);
+}
+
+void erl_zlib_zfree_callback (voidpf opaque, voidpf ptr)
+{
+    (void) opaque; /* make compiler happy */
+    erts_free(ERTS_ALC_T_ZLIB, ptr);
+}
+
+
+int ZEXPORT erl_zlib_compress2 (Bytef* dest, uLongf* destLen,
+				const Bytef* source, uLong sourceLen,
+				int level)
+{
+    z_stream stream;
+    int err;
+
+    stream.next_in = (Bytef*)source;
+    stream.avail_in = (uInt)sourceLen;
+#ifdef MAXSEG_64K
+    /* Check for source > 64K on 16-bit machine: */
+    if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
+#endif
+    stream.next_out = dest;
+    stream.avail_out = (uInt)*destLen;
+    if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
+
+    erl_zlib_alloc_init(&stream);
+
+    err = deflateInit(&stream, level);
+    if (err != Z_OK) return err;
+
+    err = deflate(&stream, Z_FINISH);
+    if (err != Z_STREAM_END) {
+        deflateEnd(&stream);
+        return err == Z_OK ? Z_BUF_ERROR : err;
+    }
+    *destLen = stream.total_out;
+
+    err = deflateEnd(&stream);
+    return err;
+}
+
+int ZEXPORT erl_zlib_uncompress (Bytef* dest, uLongf* destLen,
+				 const Bytef* source, uLong sourceLen)
+{
+    z_stream stream;
+    int err;
+
+    stream.next_in = (Bytef*)source;
+    stream.avail_in = (uInt)sourceLen;
+    /* Check for source > 64K on 16-bit machine: */
+    if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
+
+    stream.next_out = dest;
+    stream.avail_out = (uInt)*destLen;
+    if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
+
+    erl_zlib_alloc_init(&stream);
+
+    err = inflateInit(&stream);
+    if (err != Z_OK) return err;
+
+    err = inflate(&stream, Z_FINISH);
+    if (err != Z_STREAM_END) {
+        inflateEnd(&stream);
+        if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
+            return Z_DATA_ERROR;
+        return err;
+    }
+    *destLen = stream.total_out;
+
+    err = inflateEnd(&stream);
+    return err;
+}
+
-- 
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