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Fix bogus mixfile header decryption. Fixes #2176.

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This commit is contained in:
Paul Chote
2013-05-02 20:40:13 +12:00
parent b595c7f435
commit 5af983a409
1 changed files with 8 additions and 7 deletions
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15
OpenRA.FileFormats/Filesystem/MixFile.cs
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@@ -81,7 +81,7 @@ namespace OpenRA.FileFormats
byte[] keyblock = reader.ReadBytes(80);
byte[] blowfishKey = new BlowfishKeyProvider().DecryptKey(keyblock);
uint[] h = ReadUints(reader, 2);
uint[] h = ReadBlocks(reader, 1);
Blowfish fish = new Blowfish(blowfishKey);
MemoryStream ms = Decrypt( h, fish );
@@ -93,12 +93,12 @@ namespace OpenRA.FileFormats
s.Position = headerStart;
reader = new BinaryReader(s);
int byteCount = 6 + numFiles * PackageEntry.Size;
h = ReadUints( reader, ( byteCount + 3 ) / 4 );
// Round up to the next full block
int blockCount = (13 + numFiles*PackageEntry.Size)/8;
h = ReadBlocks(reader, blockCount);
ms = Decrypt( h, fish );
dataStart = headerStart + byteCount + ( ( ~byteCount + 1 ) & 7 );
dataStart = headerStart + 8*blockCount;
long ds;
return ParseTdHeader( ms, out ds );
@@ -118,9 +118,10 @@ namespace OpenRA.FileFormats
return ms;
}
uint[] ReadUints(BinaryReader r, int count)
uint[] ReadBlocks(BinaryReader r, int count)
{
uint[] ret = new uint[count];
// A block is a single encryption unit (represented as two 32-bit integers)
uint[] ret = new uint[2*count];
for (int i = 0; i < ret.Length; i++)
ret[i] = r.ReadUInt32();