1 files changed, 307 insertions, 0 deletions
diff --git a/utils/zipalign/align.cpp b/utils/zipalign/align.cpp
new file mode 100644
index 0000000..6dcff87
--- /dev/null
+++ b/utils/zipalign/align.cpp
@@ -0,0 +1,307 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Processes .zip directories so every file is aligned to a user-defined sector boundary.
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "zip_uncompressed.h"
+#include "UtlBuffer.h"
+#include "zip_utils.h"
+
+typedef unsigned int	uint;
+typedef unsigned short	ushort;
+
+// Defined constant values
+static const uint DEF_SECTOR_SIZE		=	512;		// in bytes. (512 is xbox HD sector size)
+static const uint FILE_HEADER_SIG		=	0x04034b50;
+static const uint DIRECTORY_HEADER_SIG	=	0x02014b50;
+static const uint DIRECTORY_END_SIG		=	0x06054b50;
+static const uint SIG_ERROR				=	0xffffffff;
+
+// File scope globals
+static FILE* g_fin				= 0;
+static FILE* g_fout				= 0;
+static uint	 g_sectorSize		= 0;
+static uint  g_fileCt			= 0;
+static uint  g_sizeCt			= 0;
+
+// Local function declarations
+static bool OpenInputStream		( const char* name, const char* mode );
+static void CloseInputStream	();
+static bool OpenOutputStream	( const char* name, const char* mode );
+static void CloseOutputStream	();
+static void FileError			();
+static uint FindFilenameStart	( char* name );
+
+//---------------------------------------------------------------
+//	Returns the file header signature, which is used to determine
+//	what type of header will follow.
+//---------------------------------------------------------------
+static uint GetHeaderSignature()
+{
+	fpos_t pos;
+	fgetpos( g_fin, &pos );
+
+	unsigned int sig;
+	if( !fread( &sig, 4, 1, g_fin ) )
+	{
+		FileError();
+		return SIG_ERROR;
+	}
+
+	fsetpos( g_fin, &pos );
+	return sig;
+}
+
+//---------------------------------------------------------------
+//	Reads in the header, name, and data for a zipped file
+//---------------------------------------------------------------
+static bool ReadFileData( ZIP_LocalFileHeader& fileHeader, char* filename, char*& data )
+{
+	// Read in the header
+	if( !fread( &fileHeader, sizeof(ZIP_LocalFileHeader), 1, g_fin ) )
+	{
+		FileError();
+		return false;
+	}
+
+	// buffer check
+	if( fileHeader.fileNameLength > 256 )
+	{
+		printf("Error: filename too long\n");
+		return false;
+	}
+
+	// Read in the filename
+	if( !fread( filename, fileHeader.fileNameLength, 1, g_fin ) )
+	{
+		FileError();
+		return false;
+	}
+	
+	filename[fileHeader.fileNameLength] = '\0';
+	printf("Reading file %s\n",filename);
+	
+	// Absorb any extra-field padding
+	fseek( g_fin, fileHeader.extraFieldLength, SEEK_CUR );
+
+	// NOTE: With zipped sub-directories, folders have their own header
+	// with a data size of zero.  These can be ignored (and will be by
+	// zip_utils anyway)
+	if( fileHeader.compressedSize != 0 )
+	{
+		// Read in the file data
+		data = new char[fileHeader.compressedSize];
+		if( !fread( data, fileHeader.compressedSize, 1, g_fin ) )
+		{
+			FileError();
+			delete [] data;
+			return false;
+		}
+	}
+
+	return true;
+}
+
+//---------------------------------------------------------------
+//	Does all the work of aligning each file in the directory
+//  to start on a sector boundary. (Determined by g_sectorSize)
+//
+//	.zip file format:
+//		[local file header ][filename][extra field][data]
+//		....
+//		[directory header][filename][extra field][file comment]
+//		....
+//		[central directory header][end of central directory]
+//---------------------------------------------------------------
+static bool AlignZipDirectory( const char* infile, const char* outfile )
+{
+	// Open and validate the input file
+	if( !OpenInputStream( infile, "rb" ) )
+		return false;
+
+	// Read the file header sig
+	uint sig = GetHeaderSignature();
+	if( sig == SIG_ERROR )
+		return false;
+
+	// Open and validate the output file
+	if( !OpenOutputStream( outfile, "wb" ) )
+		return false;
+
+	ZIP_LocalFileHeader hdr;
+	char filename[256]; // filename size field is 2 bytes, so to be safe the filename
+						// length is checked before copying into this buffer.
+
+	IZip *zip_utils = IZip::CreateZip();
+	if ( !zip_utils )
+		return false;
+
+	// Process all the files in the directory
+	while( sig == FILE_HEADER_SIG )
+	{
+		char * data = 0;  // the data buffer is allocated in ReadFileData.
+
+		// Get the original file
+		if( !ReadFileData( hdr, filename, data ) )
+			return false;
+		
+		if( data )
+		{
+			// Add to the zip file
+			zip_utils->AddBufferToZip( filename, data, hdr.compressedSize, false );
+
+			// Update counters
+			g_fileCt++;
+			g_sizeCt += hdr.compressedSize;
+		}
+
+		delete data;
+
+		// Read the next file header sig
+		sig = GetHeaderSignature();
+		if( sig == SIG_ERROR )
+			return false;
+	}
+
+	// Set the alignment size
+	zip_utils->ForceAlignment( true, true, g_sectorSize );
+
+	// Write the padded zip out to disk
+	printf("\nWriting aligned directory %s to disk\n",outfile);
+	zip_utils->SaveToDisk( g_fout );
+
+	IZip::ReleaseZip( zip_utils );
+
+	// Alignment complete
+	printf("\n%d Files successfully aligned.\n\n",g_fileCt);
+	
+	return true;
+}
+
+//---------------------------------------------------------------
+//	Main function
+//---------------------------------------------------------------
+void main( int argc, char **argv )
+{
+	if ( argc < 2 )
+	{
+		printf("\n");
+		printf("  Usage: zipalign {input filename} [output filename] [sector size]\n\n");
+		printf("  output filename: default = input filename prepended with \"a_\"\n");
+		printf("  sector size: minimum sector size (in bytes) to align to. Default = %d\n\n",DEF_SECTOR_SIZE);
+		return;
+	}
+
+	// Check the extension
+	size_t ext = strlen( argv[1] ) - 4;
+	if( strcmp( &argv[1][ext], ".zip" ) )
+	{
+		printf("Input file must be a .zip\n\n");
+		return;
+	}
+
+	// Get the sector size
+	g_sectorSize = DEF_SECTOR_SIZE;
+	if( argc > 3 )
+	{
+		g_sectorSize = atoi(argv[3]);
+	}
+
+	if( g_sectorSize <= 1 || ( g_sectorSize & (g_sectorSize - 1) ) )
+	{
+		printf("Invalid sector size.\n\n");
+		return;
+	}
+
+	// Call the align function
+	bool success = false;
+	if( argc > 2 )
+	{
+		success = AlignZipDirectory( argv[1], argv[2] );
+	}
+	else
+	{
+		// Construct an output filename by prepending "a_" (skip over path portion)
+		char* outfile = new char[ strlen( argv[1] ) + 3 ];
+		const uint idx = FindFilenameStart( argv[1] );
+		strcpy( outfile, argv[1] );
+		outfile[idx] = 'a';
+		outfile[idx+1] = '_';
+		strcpy( &outfile[idx+2], &argv[1][idx] );
+
+		success = AlignZipDirectory( argv[1], outfile );
+
+		delete [] outfile;
+	}
+
+	if( !success )
+	{
+		printf("\nAlignment failed.\n\n");
+	}
+
+	CloseInputStream();
+	CloseOutputStream();
+}
+
+//---------------------------------------------------------------
+//		File operations
+//---------------------------------------------------------------
+uint FindFilenameStart( char* name )
+{
+	int end = (int)strlen( name );
+	while( end >= 0 && name[end] != '\\' && name[end] != '/' )
+		--end;
+	return end + 1;
+}
+
+bool OpenInputStream( const char* name, const char* mode )
+{
+	g_fin = fopen( name, mode );
+	if( !g_fin )
+	{
+		printf("\nUnable to open the input file %s\n\n",name);
+		return false;
+	}
+
+	return true;
+}
+
+void CloseInputStream()
+{
+	if( g_fin )
+		fclose( g_fin );
+}
+
+bool OpenOutputStream( const char* name, const char* mode )
+{
+	g_fout = fopen( name, mode );
+	if( !g_fout )
+	{
+		printf("\nUnable to open the output file %s\n\n",name);
+		return false;
+	}
+
+	return true;
+}
+
+void CloseOutputStream()
+{
+	if( g_fout )
+		fclose( g_fout );
+}
+
+static void FileError()
+{
+	if( ferror(g_fin) )
+		printf("\nError reading the file.\n\n");
+	else if( feof(g_fin) )
+		printf("\nError: Unexpected end of file found.\n\n");
+	else
+		printf("\nUnknown file error.\n\n");
+}
+