1 files changed, 88 insertions, 0 deletions
diff --git a/public/zip_utils.h b/public/zip_utils.h
new file mode 100644
index 0000000..2ac2005
--- /dev/null
+++ b/public/zip_utils.h
@@ -0,0 +1,88 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose:
+//
+//=============================================================================//
+
+#ifndef ZIP_UTILS_H
+#define ZIP_UTILS_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "utlsymbol.h"
+
+class CUtlBuffer;
+#include "tier0/dbg.h"
+
+abstract_class IZip
+{
+public:
+	enum eCompressionType
+	{
+		// Type of compression used for this file in the zip
+		eCompressionType_Unknown = -1,
+		eCompressionType_None    = 0,
+		eCompressionType_LZMA    = 14
+	};
+	virtual void			Reset() = 0;
+
+	// Add a single file to a zip - maintains the zip's previous alignment state.
+	virtual void			AddFileToZip		( const char *relativename, const char *fullpath, eCompressionType compressionType = eCompressionType_None ) = 0;
+
+	// Whether a file is contained in a zip - maintains alignment
+	virtual bool			FileExistsInZip		( const char *pRelativeName ) = 0;
+
+	// Reads a file from the zip - maintains alignement.
+	virtual bool			ReadFileFromZip		( const char *pRelativeName, bool bTextMode, CUtlBuffer &buf ) = 0;
+	virtual bool			ReadFileFromZip		( HANDLE hFile, const char *pRelativeName, bool bTextMode, CUtlBuffer &buf ) = 0;
+
+	// Removes a single file from the zip - maintains alignment
+	virtual void			RemoveFileFromZip	( const char *relativename ) = 0;
+
+	// Gets next filename in zip, for walking the directory - maintains alignment
+	virtual int				GetNextFilename		( int id, char *pBuffer, int bufferSize, int &fileSize ) = 0;
+
+	// Prints the zip's contents - maintains alignment
+	virtual void			PrintDirectory		( void ) = 0;
+
+	// Estimate the size of the Zip (including header, padding, etc.)
+	virtual unsigned int	EstimateSize		( void ) = 0;
+
+	// Add buffer to zip as a file with given name - uses current alignment size, default 0 (no alignment)
+	virtual void			AddBufferToZip		( const char *relativename, void *data, int length, bool bTextMode, eCompressionType compressionType = eCompressionType_None ) = 0;
+
+	// Writes out zip file to a buffer - uses current alignment size
+	// (set by file's previous alignment, or a call to ForceAlignment)
+	virtual void			SaveToBuffer		( CUtlBuffer& outbuf ) = 0;
+
+	// Writes out zip file to a filestream - uses current alignment size
+	// (set by file's previous alignment, or a call to ForceAlignment)
+	virtual void			SaveToDisk			( FILE *fout ) = 0;
+	virtual void			SaveToDisk			( HANDLE hFileOut ) = 0;
+
+	// Reads a zip file from a buffer into memory - sets current alignment size to
+	// the file's alignment size, unless overridden by a ForceAlignment call)
+	virtual void			ParseFromBuffer		( void *buffer, int bufferlength ) = 0;
+
+	// Mounts a zip file from the disk
+	// Only ReadFileFromZip() is supported because the zip file could be >2GB
+	virtual HANDLE			ParseFromDisk		( const char *pFilename ) = 0;
+
+	// Forces a specific alignment size for all subsequent file operations, overriding files' previous alignment size.
+	// Return to using files' individual alignment sizes by passing FALSE.
+	virtual void			ForceAlignment		( bool aligned, bool bCompatibleFormat, unsigned int alignmentSize=0 ) = 0;
+
+	virtual unsigned int	GetAlignment() = 0;
+
+	// Sets the endianess of the zip
+	virtual void			SetBigEndian( bool bigEndian ) = 0;
+	virtual void			ActivateByteSwapping( bool bActivate ) = 0;
+
+	// Create/Release additional instances
+	// Disk Caching is necessary for large zips
+	static IZip *CreateZip( const char *pDiskCacheWritePath = NULL, bool bSortByName = false );
+	static void ReleaseZip( IZip *zip );
+};
+
+#endif // ZIP_UTILS_H