private static void Lock7(global::System.IntPtr @__envp, global::net.sf.jni4net.utils.JniLocalHandle @__obj, long position, long length)
{
// (JJ)V
// (JJ)V
global::net.sf.jni4net.jni.JNIEnv @__env = global::net.sf.jni4net.jni.JNIEnv.Wrap(@__envp);
try {
global::System.IO.FileStream @__real = global::net.sf.jni4net.utils.Convertor.StrongJp2C <global::System.IO.FileStream>(@__env, @__obj);
@__real.Lock(position, length);
}catch (global::System.Exception __ex) { @__env.ThrowExisting(__ex); }
}
/// <summary>
/// ファイルからCRC32を計算。返し値がCRC32。
/// </summary>
/// <param name="file"></param>
/// <returns></returns>
public UInt32 Update(global::System.IO.FileStream file)
{
unchecked
{
byte[] buffer = new byte[BUFFER_SIZE];
int readSize = BUFFER_SIZE;
UInt32 crc = HighBitMask;
try
{
file.Lock(0, file.Length);
int count = file.Read(buffer, 0, readSize);
while (count > 0)
{
for (int i = 0; i < count; i++)
{
crc = ((crc) >> 8) ^ CRCTable[(buffer[i]) ^ ((crc) & 0x000000FF)];
}
// ↑は crc = update_crc32(buffer[i], crc); と等価。
count = file.Read(buffer, 0, readSize);
}
file.Unlock(0, file.Length);
}
catch (global::System.Exception e)
{
throw e;
}
crc = ~crc;
LifetimeCRC ^= crc;
return(crc);
}
}