Leahnaya/WfcPatcher
1
0
Fork 0
mirror of https://github.com/AdmiralCurtiss/WfcPatcher.git synced 2026-04-25 15:35:25 -05:00
Code Issues Actions Packages Projects Releases Wiki Activity

Apparently there's header data for compressed stuff, good to know!

Browse Source
This commit is contained in:
Admiral H. Curtiss 2014-05-29 20:40:04 +02:00
parent a44da221eb
commit f250e8dd97
1 changed files with 28 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
Program.cs
View File

@ -43,6 +43,7 @@ namespace WfcPatcher {
static void PatchOverlay( System.IO.FileStream nds, uint pos, uint len ) {
// http://sourceforge.net/p/devkitpro/ndstool/ci/master/tree/source/ndsextract.cpp
// http://sourceforge.net/p/devkitpro/ndstool/ci/master/tree/source/overlay.h
// header compression info from http://gbatemp.net/threads/recompressing-an-overlay-file.329576/
nds.Position = 0x048;
uint fatOffset = nds.ReadUInt32();
@ -56,7 +57,8 @@ namespace WfcPatcher {
uint sinitInit = nds.ReadUInt32();
uint sinitInitEnd = nds.ReadUInt32();
uint fileId = nds.ReadUInt32();
uint reserved = nds.ReadUInt32();
uint compressedSize = nds.ReadUInt24();
byte compressedBitmask = (byte)nds.ReadByte();
nds.Position = fatOffset + 8 * id;
uint overlayPositionStart = nds.ReadUInt32();
@ -68,17 +70,37 @@ namespace WfcPatcher {
nds.Read( data, 0, (int)overlaySize );
blz blz = new blz();
byte[] decData = blz.BLZ_Decode( data );
byte[] decData;
bool compressed = ( compressedBitmask & 0x01 ) == 0x01;
if ( compressed ) {
decData = blz.BLZ_Decode( data );
} else {
decData = data;
}
if ( ReplaceInData( decData ) ) {
// if something was replaced, put it back into the ROM
if ( blz.fileWasNotCompressed ) {
data = decData; // which it should be anyway but yeah
} else {
if ( compressed ) {
uint newCompressedSize = 0;
data = blz.BLZ_Encode( decData, 0 );
newCompressedSize = (uint)data.Length;
byte[] newCompressedSizeBytes = BitConverter.GetBytes( newCompressedSize );
nds.Position = pos + i + 0x1C;
nds.Write( newCompressedSizeBytes, 0, 3 );
} else {
data = decData;
}
nds.Position = overlayPositionStart;
nds.Write( data, 0, data.Length );
overlayPositionEnd = (uint)nds.Position;
// padding
int newOverlaySize = data.Length;
int diff = (int)overlaySize - newOverlaySize;
@ -86,8 +108,7 @@ namespace WfcPatcher {
nds.WriteByte( 0xFF );
}
// and write proper offsets
overlayPositionEnd = (uint)nds.Position;
// new file end offset
byte[] newPosEndData = BitConverter.GetBytes( overlayPositionEnd );
nds.Position = fatOffset + 8 * id + 4;
nds.Write( newPosEndData, 0, 4 );