Switch to zip archive format for resource data, prep work for moving from PICT/snd to BMP/WAV

PortabilityLayer/ZipFileProxy.h

@@ -0,0 +1,30 @@
+#pragma once
+
+namespace PortabilityLayer
+{
+	class IOStream;
+	struct ZipCentralDirectoryFileHeader;
+
+	class ZipFileProxy
+	{
+	public:
+		void Destroy();
+
+		bool IndexFile(const char *path, size_t &outIndex) const;
+		bool LoadFile(size_t index, void *outBuffer);
+
+		size_t NumFiles() const;
+		size_t GetFileSize(size_t index) const;
+
+		static ZipFileProxy *Create(IOStream *stream);
+
+	private:
+		ZipFileProxy(IOStream *stream, void *centralDirImage, ZipCentralDirectoryFileHeader **sortedFiles, size_t numFiles);
+		~ZipFileProxy();
+
+		IOStream *m_stream;
+		void *m_centralDirImage;
+		ZipCentralDirectoryFileHeader **m_sortedFiles;
+		size_t m_numFiles;
+	};
+}