/// <summary>
/// 校验文件路径
/// </summary>
/// <param name="_filePath">文件路径</param>
/// <exception cref="OverflowException">溢出</exception>
/// <exception cref="FiletoolargeException">文件长度大于int32</exception>
/// <returns></returns>
public static uint GetFileCRC(string _filePath)
{
int bufferLength = 2048;
var crc32 = new CRC32();
long readedLegth = 0;
uint result = 0;
using (var file = new FileStream(_filePath, FileMode.Open, FileAccess.Read))
{
if (file.Length > long.MaxValue)
{
throw (new FiletoolargeException("文件长度大于int64"));
}
else
{
uint state = 0xffffffff;
checked
{
while (readedLegth < file.Length)
{
if ((readedLegth + bufferLength) >= file.Length)
{
var buffer = new byte[file.Length - readedLegth];
file.Read(buffer, 0, buffer.Length);
result = crc32.ByteCRC(buffer, ref state);
readedLegth += (file.Length - readedLegth);
file.Seek(readedLegth, SeekOrigin.Begin);
}
else
{
var buffer = new byte[bufferLength];
file.Read(buffer, 0, bufferLength);
result = crc32.ByteCRC(buffer, ref state);
readedLegth += bufferLength;
file.Seek(readedLegth, SeekOrigin.Begin);
}
}
}
}
}
return(result);
}
/// <summary>
/// 获取String
/// </summary>
/// <exception cref="ArgumentNullException">_string 为null</exception>
/// <returns></returns>
public static uint GetStringCRC(string _string)
{
if (_string == null)
{
throw (new ArgumentNullException("_string", "参数_string 为null"));
}
else
{
var crc32 = new CRC32();
byte[] buffer = Encoding.Default.GetBytes(_string);
return(crc32.ByteCRC(buffer));
}
}
/// <summary>
/// 获取String
/// </summary>
/// <exception cref="ArgumentNullException">_string 为null</exception>
/// <returns></returns>
public static uint GetStringCRC(string _string)
{
if (_string == null)
{
throw (new ArgumentNullException("_string", "参数_string 为null"));
}
else
{
var crc32 = new CRC32();
byte[] buffer = Encoding.Default.GetBytes(_string);
return crc32.ByteCRC(buffer);
}
}
/// <summary>
/// 获取流的CRC校验码
/// </summary>
/// <param name="_buffer"></param>
/// <returns></returns>
public static uint GetByteCRC(byte[] _buffer)
{
var crc32 = new CRC32();
return(crc32.ByteCRC(_buffer));
}
/// <summary>
/// 校验文件路径
/// </summary>
/// <param name="_filePath">文件路径</param>
/// <exception cref="OverflowException">溢出</exception>
/// <exception cref="FiletoolargeException">文件长度大于int32</exception>
/// <returns></returns>
public static uint GetFileCRC(string _filePath)
{
int bufferLength = 2048;
var crc32 = new CRC32();
long readedLegth = 0;
uint result = 0;
using (var file = new FileStream(_filePath, FileMode.Open, FileAccess.Read))
{
if (file.Length > long.MaxValue)
{
throw (new FiletoolargeException("文件长度大于int64"));
}
else
{
uint state = 0xffffffff;
checked
{
while (readedLegth < file.Length)
{
if ((readedLegth + bufferLength) >= file.Length)
{
var buffer = new byte[file.Length - readedLegth];
file.Read(buffer, 0, buffer.Length);
result = crc32.ByteCRC(buffer, ref state);
readedLegth += (file.Length - readedLegth);
file.Seek(readedLegth, SeekOrigin.Begin);
}
else
{
var buffer = new byte[bufferLength];
file.Read(buffer, 0, bufferLength);
result = crc32.ByteCRC(buffer, ref state);
readedLegth += bufferLength;
file.Seek(readedLegth, SeekOrigin.Begin);
}
}
}
}
}
return result;
}
/// <summary>
/// 获取流的CRC校验码
/// </summary>
/// <param name="_buffer"></param>
/// <returns></returns>
public static uint GetByteCRC(byte[] _buffer)
{
var crc32 = new CRC32();
return crc32.ByteCRC(_buffer);
}