public static UInt32 Calculate(String fileName)
{
UInt32 checksum = 0xFFFFFFFF;
// open file
using (FileStream fs = File.OpenRead(fileName))
{
using (BinaryReader br = new BinaryReader(fs))
{
// read version
Int32 version = br.ReadInt32();
if (version != 29 && version != 30)
{
throw new ApplicationException(String.Format("Unknown map version {0}, expected 29 or 30.", version));
}
// read lump headers
LumpHeader[] lumpHeaders = new LumpHeader[nLumpHeaders];
for (Int32 i = 0; i < nLumpHeaders; i++)
{
lumpHeaders[i].Offset = br.ReadInt32();
lumpHeaders[i].Length = br.ReadInt32();
}
// read lumps and calculate checksum
for (Int32 i = 1; i < nLumpHeaders; i++)
{
fs.Seek(lumpHeaders[i].Offset, SeekOrigin.Begin);
Int32 length = lumpHeaders[i].Length;
while (length > 0)
{
Byte[] buffer = null;
if (length >= readBufferSize)
{
buffer = br.ReadBytes(readBufferSize);
}
else
{
buffer = br.ReadBytes(length);
}
length -= buffer.Length;
ProcessBuffer(buffer, ref checksum);
}
}
}
}
return(checksum);
}
public static UInt32 Calculate(String fileName)
{
UInt32 checksum = 0xFFFFFFFF;
// open file
using (FileStream fs = File.OpenRead(fileName))
{
using (BinaryReader br = new BinaryReader(fs))
{
// read version
Int32 version = br.ReadInt32();
if (version != 29 && version != 30)
{
throw new ApplicationException(String.Format("Unknown map version {0}, expected 29 or 30.", version));
}
// read lump headers
LumpHeader[] lumpHeaders = new LumpHeader[nLumpHeaders];
for (Int32 i = 0; i < nLumpHeaders; i++)
{
lumpHeaders[i].Offset = br.ReadInt32();
lumpHeaders[i].Length = br.ReadInt32();
}
// read lumps and calculate checksum
for (Int32 i = 1; i < nLumpHeaders; i++)
{
fs.Seek(lumpHeaders[i].Offset, SeekOrigin.Begin);
Int32 length = lumpHeaders[i].Length;
while (length > 0)
{
Byte[] buffer = null;
if (length >= readBufferSize)
{
buffer = br.ReadBytes(readBufferSize);
}
else
{
buffer = br.ReadBytes(length);
}
length -= buffer.Length;
ProcessBuffer(buffer, ref checksum);
}
}
}
}
return checksum;
}
