文件CRC和MD5校验

文件CRC和MD5校验

CRC和MD5用于文件和数据的传输校验，以确认是否接收成功。

unit CRCMD5;

interface
{ 获取文件CRC校验码 }
function GetFileCRC(const iFileName: string): String;
{ 获取字符串CRC校验码 }
function GetStringCRC(const Str: string): Cardinal;
{ 取文件MD5码 }
function GetFileMD5(const iFileName: string): String;

implementation

uses Classes, IdHashMessageDigest, IdHashCRC;

{ 获取文件CRC校验码 }
function GetFileCRC(const iFileName: string): String;
var
  MemSteam: TMemoryStream;
  MyCRC   : TIdHashCRC32;
begin
  MemSteam := TMemoryStream.Create;
  MemSteam.LoadFromFile(iFileName);
  MyCRC  := TIdHashCRC32.Create;
  Result := MyCRC.HashStreamAsHex(MemSteam);
  MyCRC.Free;
  MemSteam.Free;
end;
{ 获取字符串CRC校验码 }
function GetStringCRC(const Str: string): Cardinal;
var
  MyCRC: TIdHashCRC32;
begin
  MyCRC  := TIdHashCRC32.Create;
  Result := MyCRC.HashValue(Str);
  MyCRC.Free;
end;
{ 取文件MD5码 }
function GetFileMD5(const iFileName: string): String;
var
  MemSteam: TMemoryStream;
  MyMD5   : TIdHashMessageDigest5;
begin
  MemSteam := TMemoryStream.Create;
  MemSteam.LoadFromFile(iFileName);
  MyMD5  := TIdHashMessageDigest5.Create;
  Result := MyMD5.HashStreamAsHex(MemSteam);
  MyMD5.Free;
  MemSteam.Free;
end;
end.