private static unsafe uint[] ReadBlockOffsets(MpqArchive archive, uint hash, long offset, int count)
{
int length = count * sizeof(uint);
var sharedBuffer = CommonMethods.GetSharedBuffer(length);
if (archive.ReadArchiveData(sharedBuffer, 0, offset, length) != length)
{
throw new EndOfStreamException();
}
var offsets = new uint[count];
Buffer.BlockCopy(sharedBuffer, 0, offsets, 0, length);
if (!BitConverter.IsLittleEndian)
{
CommonMethods.SwapBytes(offsets);
}
// If hash is valid, decode the header
if (hash != 0)
{
unchecked { CommonMethods.Decrypt(offsets, hash - 1); }
}
return(offsets);
}
private static unsafe PatchInfoHeader ReadPatchInfoHeader(MpqArchive archive, long offset)
{
// Always get a buffer big enough, even if the extra bytes are not present…
// As of now (09/2011), the header should always be 28 bytes long, but this may change in the future…
var sharedBuffer = CommonMethods.GetSharedBuffer(sizeof(PatchInfoHeader));
// No buffer should ever be smaller than 28 bytes… right ?
if (archive.ReadArchiveData(sharedBuffer, 0, offset, 28) != 28)
{
throw new EndOfStreamException(ErrorMessages.GetString("PatchInfoHeaderEndOfStream")); // It's weird if we could not read the whole 28 bytes… (At worse, we should have read trash data)
}
var patchInfoHeader = new PatchInfoHeader();
patchInfoHeader.HeaderLength = (uint)sharedBuffer[0] | (uint)sharedBuffer[1] << 8 | (uint)sharedBuffer[2] << 16 | (uint)sharedBuffer[3] << 24;
patchInfoHeader.Flags = (uint)sharedBuffer[4] | (uint)sharedBuffer[5] << 8 | (uint)sharedBuffer[6] << 16 | (uint)sharedBuffer[7] << 24;
patchInfoHeader.PatchLength = (uint)sharedBuffer[8] | (uint)sharedBuffer[9] << 8 | (uint)sharedBuffer[10] << 16 | (uint)sharedBuffer[11] << 24;
// Let's assume the MD5 is not mandatory…
if (patchInfoHeader.HeaderLength >= 28)
{
for (int i = 0; i < 16; i++)
{
patchInfoHeader.PatchMD5[i] = sharedBuffer[12 + i];
}
}
return(patchInfoHeader);
}
private static unsafe bool TestPatchHeader(MpqArchive archive, long offset)
{
var sharedBuffer = CommonMethods.GetSharedBuffer(4);
if (archive.ReadArchiveData(sharedBuffer, 0, offset, 4) != 4)
{
throw new EndOfStreamException();
}
return(sharedBuffer[0] == 0x50 && sharedBuffer[1] == 0x54 && sharedBuffer[2] == 0x43 && sharedBuffer[3] == 0x48);
}
public override int Read(byte[] buffer, int offset, int count)
{
if (position >= archive.userDataLength)
{
return(0);
}
int remaining = checked ((int)(archive.userDataLength - position));
if (count > remaining)
{
count = remaining;
}
position += (count = archive.ReadArchiveData(buffer, 0, 0, count));
return(count);
}
private static unsafe bool TestPatchHeader(MpqArchive archive, long offset)
{
var sharedBuffer = CommonMethods.GetSharedBuffer(4);
if (archive.ReadArchiveData(sharedBuffer, 0, offset, 4) != 4) throw new EndOfStreamException();
return sharedBuffer[0] == 0x50 && sharedBuffer[1] == 0x54 && sharedBuffer[2] == 0x43 && sharedBuffer[3] == 0x48;
}
private static unsafe PatchInfoHeader ReadPatchInfoHeader(MpqArchive archive, long offset)
{
// Always get a buffer big enough, even if the extra bytes are not present…
// As of now (09/2011), the header should always be 28 bytes long, but this may change in the future…
var sharedBuffer = CommonMethods.GetSharedBuffer(sizeof(PatchInfoHeader));
// No buffer should ever be smaller than 28 bytes… right ?
if (archive.ReadArchiveData(sharedBuffer, 0, offset, 28) != 28)
throw new EndOfStreamException(ErrorMessages.GetString("PatchInfoHeaderEndOfStream")); // It's weird if we could not read the whole 28 bytes… (At worse, we should have read trash data)
var patchInfoHeader = new PatchInfoHeader();
patchInfoHeader.HeaderLength = (uint)sharedBuffer[0] | (uint)sharedBuffer[1] << 8 | (uint)sharedBuffer[2] << 16 | (uint)sharedBuffer[3] << 24;
patchInfoHeader.Flags = (uint)sharedBuffer[4] | (uint)sharedBuffer[5] << 8 | (uint)sharedBuffer[6] << 16 | (uint)sharedBuffer[7] << 24;
patchInfoHeader.PatchLength = (uint)sharedBuffer[8] | (uint)sharedBuffer[9] << 8 | (uint)sharedBuffer[10] << 16 | (uint)sharedBuffer[11] << 24;
// Let's assume the MD5 is not mandatory…
if (patchInfoHeader.HeaderLength >= 28)
for (int i = 0; i < 16; i++) patchInfoHeader.PatchMD5[i] = sharedBuffer[12 + i];
return patchInfoHeader;
}
private static unsafe uint[] ReadBlockOffsets(MpqArchive archive, uint hash, long offset, int count)
{
int length = count * sizeof(uint);
var sharedBuffer = CommonMethods.GetSharedBuffer(length);
if (archive.ReadArchiveData(sharedBuffer, 0, offset, length) != length) throw new EndOfStreamException();
var offsets = new uint[count];
Buffer.BlockCopy(sharedBuffer, 0, offsets, 0, length);
if (!BitConverter.IsLittleEndian) CommonMethods.SwapBytes(offsets);
// If hash is valid, decode the header
if (hash != 0) unchecked { CommonMethods.Decrypt(offsets, hash - 1); }
return offsets;
}
