BPackageWriter: Add Recompress()

Allows rewriting an existing package file with a different compression.

headers/os/package/hpkg/PackageReader.h

@@ -24,6 +24,7 @@ class BAbstractBufferedDataReader;
 class BErrorOutput;
 class BLowLevelPackageContentHandler;
 class BPackageContentHandler;
+class BPackageWriter;
 
 
 class BPackageReader {
@@ -43,6 +44,9 @@ public:
 			BAbstractBufferedDataReader* HeapReader() const;
 									// Only valid as long as the reader lives.
 
+private:
+			friend class BPackageWriter;
+
 private:
 			PackageReaderImpl*	fImpl;
 };

headers/os/package/hpkg/PackageWriter.h

@@ -16,6 +16,9 @@ namespace BPackageKit {
 namespace BHPKG {
 
 
+class BPackageReader;
+
+
 namespace BPrivate {
 	class PackageWriterImpl;
 }
@@ -72,6 +75,9 @@ public:
 			status_t			AddEntry(const char* fileName, int fd = -1);
 			status_t			Finish();
 
+			status_t			Recompress(BPackageReader* reader);
+									// to be called after Init(); no Finish()
+
 private:
 			PackageWriterImpl*	fImpl;
 };