Allow specifying the compression level for package creation

* Introduce BPackageWriterParameters which comprises all parameters
  for package creation, currently flags and compression level. Such an
  object can be passed to BPackageWriter::Init() and is passed on to
  PackageWriterImpl and WriterImplBase.
* PackageFileHeapWriter: Add compressionLevel property and pass the
  value on to ZlibCompressor.
* package add/create: Add options -0 ... -9 to specify the compression
  level to be used.

headers/os/package/hpkg/HPKGDefs.h

@@ -166,6 +166,13 @@ enum {
 };
 
 
+enum {
+	B_HPKG_COMPRESSION_LEVEL_NONE		= 0,
+	B_HPKG_COMPRESSION_LEVEL_FASTEST	= 1,
+	B_HPKG_COMPRESSION_LEVEL_BEST		= 9
+};
+
+
 }	// namespace BHPKG
 
 }	// namespace BPackageKit

headers/os/package/hpkg/PackageWriter.h

@@ -41,13 +41,32 @@ public:
 };
 
 
+class BPackageWriterParameters {
+public:
+								BPackageWriterParameters();
+								~BPackageWriterParameters();
+
+			uint32				Flags() const;
+			void				SetFlags(uint32 flags);
+
+			int32				CompressionLevel() const;
+			void				SetCompressionLevel(int32 compressionLevel);
+
+private:
+			uint32				fFlags;
+			int32				fCompressionLevel;
+};
+
+
 class BPackageWriter {
 public:
 								BPackageWriter(
 									BPackageWriterListener* listener);
 								~BPackageWriter();
 
-			status_t			Init(const char* fileName, uint32 flags = 0);
+			status_t			Init(const char* fileName,
+									const BPackageWriterParameters* parameters
+										= NULL);
 			status_t			SetInstallPath(const char* installPath);
 			void				SetCheckLicenses(bool checkLicenses);
 			status_t			AddEntry(const char* fileName, int fd = -1);

headers/private/package/hpkg/PackageFileHeapWriter.h

@@ -35,7 +35,8 @@ class PackageFileHeapWriter : public PackageFileHeapAccessorBase,
 	private AbstractDataWriter {
 public:
 								PackageFileHeapWriter(BErrorOutput* errorOutput,
-									int fd, off_t heapOffset);
+									int fd, off_t heapOffset,
+									int32 compressionLevel);
 								~PackageFileHeapWriter();
 
 			void				Init();
@@ -86,6 +87,7 @@ private:
 			void*				fCompressedDataBuffer;
 			size_t				fPendingDataSize;
 			Array<uint64>		fOffsets;
+			int32				fCompressionLevel;
 };
 
 

headers/private/package/hpkg/PackageWriterImpl.h

@@ -29,6 +29,7 @@ namespace BHPKG {
 
 class BDataReader;
 class BErrorOutput;
+class BPackageWriterParameters;
 
 
 namespace BPrivate {
@@ -46,7 +47,8 @@ public:
 									BPackageWriterListener* listener);
 								~PackageWriterImpl();
 
-			status_t			Init(const char* fileName, uint32 flags);
+			status_t			Init(const char* fileName,
+									const BPackageWriterParameters& parameters);
 			status_t			SetInstallPath(const char* installPath);
 			void				SetCheckLicenses(bool checkLicenses);
 			status_t			AddEntry(const char* fileName, int fd = -1);
@@ -62,7 +64,8 @@ private:
 			typedef DoublyLinkedList<Entry> EntryList;
 
 private:
-			status_t			_Init(const char* fileName, uint32 flags);
+			status_t			_Init(const char* fileName,
+									const BPackageWriterParameters& parameters);
 			status_t			_Finish();
 
 			status_t			_RegisterEntry(const char* fileName, int fd);

headers/private/package/hpkg/WriterImplBase.h

@@ -12,6 +12,7 @@
 
 #include <package/hpkg/DataOutput.h>
 #include <package/hpkg/DataWriters.h>
+#include <package/hpkg/PackageWriter.h>
 #include <package/hpkg/Strings.h>
 #include <package/hpkg/ZlibCompressor.h>
 
@@ -99,7 +100,8 @@ protected:
 			typedef DoublyLinkedList<PackageAttribute> PackageAttributeList;
 
 protected:
-			status_t			Init(const char* fileName, uint32 flags);
+			status_t			Init(const char* fileName,
+									const BPackageWriterParameters& parameters);
 
 			void				RegisterPackageInfo(
 									PackageAttributeList& attributeList,
@@ -168,7 +170,7 @@ private:
 			const char*			fFileType;
 			BErrorOutput*		fErrorOutput;
 			const char*			fFileName;
-			uint32				fFlags;
+			BPackageWriterParameters fParameters;
 			int					fFD;
 			bool				fFinished;
 
@@ -211,7 +213,7 @@ WriterImplBase::FD() const
 inline uint32
 WriterImplBase::Flags() const
 {
-	return fFlags;
+	return fParameters.Flags();
 }