frameworks/native: move Zip* from libandroidfw to libutils

ZipUtils is needed by build/tools, move it from libandroidfw
(frameworks/base) to libutils (frameworks/native).

Change-Id: Ib8c41134ccdec6d6aa8d49860f8dddef49a24783

1 files changed, 67 insertions, 0 deletions

diff --git a/include/utils/ZipUtils.h b/include/utils/ZipUtils.h
new file mode 100644
index 0000000..42c42b6
--- /dev/null
+++ b/include/utils/ZipUtils.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+// Miscellaneous zip/gzip utility functions.
+//
+#ifndef __LIBS_ZIPUTILS_H
+#define __LIBS_ZIPUTILS_H
+
+#include <stdio.h>
+
+namespace android {
+
+/*
+ * Container class for utility functions, primarily for namespace reasons.
+ */
+class ZipUtils {
+public:
+    /*
+     * General utility function for uncompressing "deflate" data from a file
+     * to a buffer.
+     */
+    static bool inflateToBuffer(int fd, void* buf, long uncompressedLen,
+        long compressedLen);
+    static bool inflateToBuffer(FILE* fp, void* buf, long uncompressedLen,
+        long compressedLen);
+
+    /*
+     * Someday we might want to make this generic and handle bzip2 ".bz2"
+     * files too.
+     *
+     * We could declare gzip to be a sub-class of zip that has exactly
+     * one always-compressed entry, but we currently want to treat Zip
+     * and gzip as distinct, so there's no value.
+     *
+     * The zlib library has some gzip utilities, but it has no interface
+     * for extracting the uncompressed length of the file (you do *not*
+     * want to gzseek to the end).
+     *
+     * Pass in a seeked file pointer for the gzip file.  If this is a gzip
+     * file, we set our return values appropriately and return "true" with
+     * the file seeked to the start of the compressed data.
+     */
+    static bool examineGzip(FILE* fp, int* pCompressionMethod,
+        long* pUncompressedLen, long* pCompressedLen, unsigned long* pCRC32);
+
+private:
+    ZipUtils() {}
+    ~ZipUtils() {}
+};
+
+}; // namespace android
+
+#endif /*__LIBS_ZIPUTILS_H*/