C / C++ / MFC

<br />
#include <iostream><br />
#include <string><br />
#include <fstream><br />
<br />
int main(int argc, char * argv[])<br />
{<br />
  if (argc != 2) {<br />
    cout<<"usage: id3v2 filename.mp3\n";<br />
    exit(0);<br />
  }<br />
<br />
  ifstream in;<br />
  in.open(argv[1]);<br />
<br />
  //read in the header.<br />
  char header[10];<br />
  in.read(header,10);<br />
  header[10] = '\0';<br />
<br />
  //make sure the tag exists.<br />
  if(header[0] == 'I' && header[1] == 'D' && header[2] == '3'){<br />
      //get header size.<br />
      int hSize = ((header[3] & 127) << 21) |<br />
                   ((header[4] & 127) << 14) |<br />
                   ((header[5] & 127) <<  7) |<br />
                   (header[6] & 127);<br />
<br />
      //get the version of the tag.<br />
      int versionMajor, versionMinor;<br />
      versionMajor = header[3];<br />
      versionMinor = header[4];<br />
<br />
      //get the flags.<br />
      bool unsynchronisation,compression,experimental,extended,footer;<br />
      unsynchronisation = false;<br />
      compression       = false;<br />
      experimental      = false;<br />
      extended          = false;<br />
      footer            = false;<br />
<br />
      //not sure if this is correct.<br />
      //Dont really completely understand the 0x80,0x40,etc..<br />
      switch(versionMajor){<br />
          case 2:<br />
               // %ab000000 in v2.2<br />
               unsynchronisation = (bool)(header[5] & 0x80);  // a - Unsynchronisation<br />
               compression       = (bool)(header[5] & 0x40);  // b - Compression<br />
               break;<br />
<br />
          case 3:<br />
               //%abc00000 in v2.3<br />
               unsynchronisation = (bool)(header[5] & 0x80); // a - Unsynchronisation<br />
               extended          = (bool)(header[5] & 0x40); // b - Extended header<br />
               experimental      = (bool)(header[5] & 0x20); // c - Experimental indicator<br />
               break;<br />
<br />
          case 4:<br />
               // %abcd0000 in v2.4<br />
               unsynchronisation = (bool)(header[5] & 0x80); // a - Unsynchronisation<br />
               extended          = (bool)(header[5] & 0x40); // b - Extended header<br />
               experimental      = (bool)(header[5] & 0x20); // c - Experimental indicator<br />
               footer            = (bool)(header[5] & 0x10); // d - Footer present<br />
               break;<br />
      }<br />
<br />
      //size of all of the frames.<br />
      int sizeOfFrames;<br />
      sizeOfFrames = hSize - 10; //- 10 to disclude the actual header.<br />
      /*  not sure if this should apply.<br />
      if(extended){<br />
           cout<<"extended\n";<br />
           char extHeader[4];<br />
           in.read(extHeader, 4);<br />
           int extSize;<br />
           extSize =  ((header[0] & 127) << 21) |<br />
                   ((header[1] & 127) << 14) |<br />
                   ((header[2] & 127) <<  7) |<br />
                   (header[3] & 127);<br />
          in.seekg(extSize);<br />
          sizeOfFrames -= extSize;<br />
      }<br />
      if(footer)<br />
          sizeOfFrames -= 10; //disclude the footer.<br />
      */<br />
<br />
      cout<<"sizeOfFrames="<<sizeOfFrames<<endl;<br />
      cout<<"\n\n";<br />
<br />
          while(sizeOfFrames > 0){<br />
              char frameId[4];<br />
              char frameData[6];<br />
              int frameSize;<br />
<br />
              in.read(frameId,4); //read the frame id 'TIT2',etc..<br />
              in.read(frameData,6); //read the rest of the frame header.<br />
<br />
              frameId[4]   = '\0'; //add null terminator to end of string.<br />
              frameData[6] = '\0'; //add null terminator to end of string.<br />
<br />
              //get the size of the frame.<br />
              frameSize =  ((frameData[0] & 127) << 21) |<br />
                        ((frameData[1] & 127) << 14) |<br />
                        ((frameData[2] & 127) <<  7) |<br />
                        (frameData[3] & 127);<br />
<br />
              if((frameSize > 0) && (frameSize < sizeOfFrames)){<br />
<br />
                    char tagInfo[frameSize];<br />
                    in.read(tagInfo,frameSize);<br />
                    tagInfo[frameSize] = '\0'; //add null terminator to end of string.<br />
<br />
                    cout<<"frameId="<<frameId<<"\n";<br />
                    cout<<"frameSize="<<frameSize<<"\n";<br />
                    cout<<"tagInfo=";<br />
                    for(int x=0;x<sizeof(tagInfo);x++)<br />
                            cout<<tagInfo[x]; //for some reason i cant just cout<<tagInfo<<"\n\n";<br />
                    cout<<"\n\n";<br />
<br />
              }<br />
              sizeOfFrames -= frameSize;<br />
          }<br />
          if(versionMajor == 2){<br />
                  ; //to do?<br />
          }<br />
      }<br />
  system("pause");<br />
  return 0;<br />
}<br />