public static UInt32 CheckSumFile(string fileName)
{
CRC32 crc = new CRC32 ();
int bufferLen = 32 * 1024;
using (FileStream fs = File.OpenRead(fileName)) {
byte[] buffer = new byte[bufferLen];
while (true) {
int n = fs.Read (buffer, 0, bufferLen);
if (n == 0)
break;
crc.Write (buffer, 0, n);
}
}
return crc.Sum32 ();
}
/// <summary>
/// 计算沙盒文件的crc32值
/// </summary>
/// <param name="filePath">沙盒文件全路径</param>
/// <returns>crc32值</returns>
public static UInt32 CheckSumFile(string filePath)
{
CRC32 crc = new CRC32();
int bufferLen = 32 * 1024;
using (FileStream fs = IsolatedStorageFile.GetUserStoreForApplication().OpenFile(filePath, FileMode.Open, FileAccess.Read))
{
byte[] buffer = new byte[bufferLen];
while (true)
{
int n = fs.Read(buffer, 0, bufferLen);
if (n == 0)
break;
crc.Write(buffer, 0, n);
}
}
return crc.Sum32();
}
public static UInt32 CheckSumSlice(byte[] data, int offset, int count)
{
CRC32 crc = new CRC32();
crc.Write(data, offset, count);
return crc.Sum32();
}
/// <summary>
/// 计算字节数据的crc32值
/// </summary>
/// <param name="data">二进制数据</param>
/// <param name="length">长度</param>
/// <returns>crc32值</returns>
public static UInt32 CheckSumBytes(byte[] data)
{
CRC32 crc = new CRC32();
crc.Write(data, 0, data.Length);
return crc.Sum32();
}