using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using System.Text.RegularExpressions;using zlib;//using前要先引用namespace KrcLib{publicclass KrcReader : IDisposable{private Stream _sourceStream = new MemoryStream();public Stream SourceStream{get { return _sourceStream; }privateset { _sourceStream = value; }}///<summary>///用包含krc数据的流创建///</summary>///<param name="sourceStream">包含krc数据的流</param>public KrcReader(Stream sourceStream){sourceStream.CopyTo(this.SourceStream);this.SourceStream.Position = 0;}///<summary>///打开krc文件///</summary>///<param name="fileName">文件全路径</param>public KrcReader(string fileName){this.SourceStream = new FileStream(fileName, FileMode.Open, FileAccess.Read);}///<summary>///将包含krc数据的流解析为包含明码的流///</summary>///<returns>明码流</returns>public Stream GetKrcStream(){//krc数据需要先解密再解压缩//在这之前先去掉头部4字节的krc歌词版本号:krc1 其HEX为:6b 72 63 31//解密:遍历字节时循环地使每个字节与数组h中对应元素异或运算//解压缩:zlib使用LZ77的变种算法,DEFLATE的算法char[] h = { '@', 'G', 'a', 'w', '^', '2', 't', 'G', 'Q', '6', '1', '-', 'Î', 'Ò', 'n', 'i' }; MemoryStream outStream = new MemoryStream();ZOutputStream outZStream = new ZOutputStream(outStream);SourceStream.Position = 4;//去掉头部4字节int len = 0;byte[] databuffer = newbyte[1024];while ((len = SourceStream.Read(databuffer, 0, 1024)) > 0){int m;for (int k = 0; k < len; k++){m = k % 16;databuffer[k] = (byte)(databuffer[k] ^ h[m]);//异或解密}outZStream.Write(databuffer, 0, len);//zlib解压缩}outZStream.finish();MemoryStream tmp = new MemoryStream();outStream.Position = 0;outStream.CopyTo(tmp);//复制新的流以便outZStream.Close()时不会关闭要返回的流tmp.Position = 0;//tmp被CopyTo时到了尾部,返回前需要重置位置outStream = tmp;//指向刚复制的流用于返回outZStream.Close();return outStream;}///<summary>///将包含krc数据的流解析为字符串///</summary>///<returns>解析后的字符串</returns>publicstring GetKrcString(){using (Stream decodedStream = GetKrcStream()){byte[] buffer = newbyte[decodedStream.Length];int i = decodedStream.Read(buffer, 0, buffer.Length);return Encoding.UTF8.GetString(buffer, 0, i);}}///<summary>///将包含krc数据的流解析为按行存储的列表///</summary>///<returns>解析后的行列表</returns>public List<string> GetKrcList(){List<string> rowList = new List<string>();using (StreamReader sr = new StreamReader(GetKrcStream(), Encoding.UTF8)){while (!sr.EndOfStream)rowList.Add(sr.ReadLine());}return rowList;}///<summary>///将包含krc数据的流转换为按行存储的lrc格式列表///</summary>///<returns>lrc格式列表</returns>public IEnumerable<string> ToLrcList(){List<string> krcList = GetKrcList();//List<string> lrcList = new List<string>();Regex rowReg = new Regex(@"^\[\d+,\d+\](<\d+,\d+,\d+>.+)*");//匹配一行krc格式的歌词Regex timeLableReg1 = new Regex(@"^\[\d+,\d+\]");//匹配krc格式行的时间Regex timeLableReg2 = new Regex(@"<\d+,\d+,\d+>");//匹配krc格式字的时间char[] splitChars = { '[', ',', ']' };//用于取得每行的开始时刻Regex idLabelReg = new Regex(@"^\[(ar|ta|al|by|offset|encoding|la|fm|wl|wm|co|ad):.*\]$", RegexOptions.IgnoreCase);IEnumerable<string> lrcIdLabelList = from row in krcListwhere idLabelReg.IsMatch(row) == trueselect row;IEnumerable<string> lrcTextList = from row in krcListwhere rowReg.IsMatch(row) == truelet newRow2 = timeLableReg2.Replace(row, "")//去除对每个字的时间标签,如<0,751,0>let timeKrcLabel = timeLableReg1.Match(newRow2).Value//获取对行的时间标签,如[2781,3355]let timeKrc = Convert.ToInt32(timeKrcLabel.Split(splitChars, StringSplitOptions.RemoveEmptyEntries)[0]) * 10000//获取每行的开始时刻，以100纳秒为单位let timeLrc = new DateTime(timeKrc).ToString("[mm:ss.ff]")//生成lrc格式的时间标签,如[00:02.78]//let timeLrc = string.Format("[{0:mm}:{0:ss}.{0:ff}]", new DateTime(timeKrc))//let timeKrc = Convert.ToSingle(timeKrcLabel.Split(splitChars,StringSplitOptions.RemoveEmptyEntries)[0]) / 1000//let timeLrc = string.Format("[{0:00}:{1:00.00}]", timeKrc / 60, timeKrc % 60)let newRow1 = newRow2.Replace(timeKrcLabel, timeLrc)//生成lrc格式的一行歌词select newRow1;List<string> lrcList = new List<string>(lrcIdLabelList);lrcList.AddRange(lrcTextList);return lrcList;}///<summary>///将包含krc数据的流转换为lrc流///</summary>///<returns>包含lrc数据的流</returns>public Stream ToLrcStream(){IEnumerable<string> lrcList = ToLrcList();//获取krc的每一行MemoryStream outStream = new MemoryStream();//初始化要返回的流using (MemoryStream tmp = new MemoryStream())//用于写入lrc数据的流{using (StreamWriter sw = new StreamWriter(tmp, Encoding.UTF8))//利用sw编码并写入数据到tmp{foreach (string item in lrcList)sw.WriteLine(item);//写入每一行到tmpsw.Flush();//确保全部写入到tmptmp.Position = 0;//便于CopyTo()时复制整个流tmp.CopyTo(outStream);//复制到要返回的流,不返回tmp因为tmp在sw关闭时关闭 }}outStream.Position = 0;//被CopyTo()后指向结束位置,返回前置零return outStream;}///<summary>///将包含krc数据的流转换为lrc字符串///</summary>///<returns>lrc格式的字符串</returns>publicstring ToLrcString(){IEnumerable<string> lrcList = ToLrcList();//获取krc的每一行StringBuilder sb = new StringBuilder();foreach (string item in lrcList)sb.AppendLine(item);return sb.ToString();}///<summary>///释放资源///</summary>void IDisposable.Dispose(){this.SourceStream.Close();this.SourceStream.Dispose();}}}。
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