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public/zip_uncompressed.h

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+//========= Copyright <20> 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#ifndef ZIP_UNCOMPRESSED_H
+#define ZIP_UNCOMPRESSED_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "datamap.h"
+
+#define PKID( a, b ) (((b)<<24)|((a)<<16)|('K'<<8)|'P')
+
+#pragma pack(1)
+
+struct ZIP_EndOfCentralDirRecord
+{
+	DECLARE_BYTESWAP_DATADESC();
+	unsigned int	signature; // 4 bytes PK56
+	unsigned short	numberOfThisDisk;  // 2 bytes
+	unsigned short	numberOfTheDiskWithStartOfCentralDirectory; // 2 bytes
+	unsigned short	nCentralDirectoryEntries_ThisDisk;	// 2 bytes
+	unsigned short	nCentralDirectoryEntries_Total;	// 2 bytes
+	unsigned int	centralDirectorySize; // 4 bytes
+	unsigned int	startOfCentralDirOffset; // 4 bytes
+	unsigned short	commentLength; // 2 bytes
+	// zip file comment follows
+};
+
+struct ZIP_FileHeader
+{
+	DECLARE_BYTESWAP_DATADESC();
+	unsigned int	signature; //  4 bytes PK12 
+	unsigned short	versionMadeBy; // version made by 2 bytes 
+	unsigned short	versionNeededToExtract; // version needed to extract 2 bytes 
+	unsigned short	flags; // general purpose bit flag 2 bytes 
+	unsigned short	compressionMethod; // compression method 2 bytes 
+	unsigned short	lastModifiedTime; // last mod file time 2 bytes 
+	unsigned short	lastModifiedDate; // last mod file date 2 bytes 
+	unsigned int	crc32; // crc-32 4 bytes 
+	unsigned int	compressedSize; // compressed size 4 bytes 
+	unsigned int	uncompressedSize; // uncompressed size 4 bytes 
+	unsigned short	fileNameLength; // file name length 2 bytes 
+	unsigned short	extraFieldLength; // extra field length 2 bytes 
+	unsigned short	fileCommentLength; // file comment length 2 bytes 
+	unsigned short	diskNumberStart; // disk number start 2 bytes 
+	unsigned short	internalFileAttribs; // internal file attributes 2 bytes 
+	unsigned int	externalFileAttribs; // external file attributes 4 bytes 
+	unsigned int	relativeOffsetOfLocalHeader; // relative offset of local header 4 bytes 
+	// file name (variable size) 
+	// extra field (variable size) 
+	// file comment (variable size) 
+};
+
+struct ZIP_LocalFileHeader
+{
+	DECLARE_BYTESWAP_DATADESC();
+	unsigned int	signature; //local file header signature 4 bytes PK34 
+	unsigned short	versionNeededToExtract; // version needed to extract 2 bytes 
+	unsigned short	flags; // general purpose bit flag 2 bytes 
+	unsigned short	compressionMethod; // compression method 2 bytes 
+	unsigned short	lastModifiedTime; // last mod file time 2 bytes 
+	unsigned short	lastModifiedDate; // last mod file date 2 bytes 
+	unsigned int	crc32; // crc-32 4 bytes 
+	unsigned int	compressedSize; // compressed size 4 bytes 
+	unsigned int	uncompressedSize; // uncompressed size 4 bytes 
+	unsigned short	fileNameLength; // file name length 2 bytes 
+	unsigned short	extraFieldLength; // extra field length 2 bytes 
+	// file name (variable size) 
+	// extra field (variable size) 
+};
+
+//=============================================================================//
+//	Valve Non standard Extension, Preload Section
+//	An optional first file in an aligned zip that can be loaded into ram and
+//	used by the FileSystem to supply header data rather than disk.
+//	Is is an optimization to prevent the large of amount of small I/O performed
+///	by the map loading process.
+//=============================================================================//
+
+#define PRELOAD_SECTION_NAME	"__preload_section.pre"
+#define PRELOAD_HDR_VERSION		3
+#define XZIP_COMMENT_LENGTH		32
+#define INVALID_PRELOAD_ENTRY	( (unsigned short)-1 )
+
+struct ZIP_PreloadHeader 
+{
+	DECLARE_BYTESWAP_DATADESC();
+	unsigned int Version;					// VERSION
+	unsigned int DirectoryEntries;			// Number of zip directory entries.
+	unsigned int PreloadDirectoryEntries;	// Number of preloaded directory entries (equal or less than the zip dir).
+	unsigned int Alignment;					// File alignment of the zip
+};
+
+struct ZIP_PreloadDirectoryEntry
+{
+	DECLARE_BYTESWAP_DATADESC();
+    unsigned int Length;					// Length of the file's preload data in bytes
+    unsigned int DataOffset;				// Offset the file data in the .zip, relative to the logical beginning of the preload file.
+};
+
+struct ZIP_PreloadRemapTable
+{
+	DECLARE_BYTESWAP_DATADESC();
+	unsigned short PreloadIndex;			// Index into preload directory, entry marked invalid if no preload entry present
+};
+
+#pragma pack()
+
+#endif // ZIP_UNCOMPRESSED_H