接着解析图层的adjustmentData部分信息：

第一个signature是固定的8BIM

第二个是标示下面的data内容所属类型的key

第三个是内容长度。

var ba:ByteArray = new ByteArray();
var signature:String = adjustmentData.readUTFBytes(4); //always 8BIM
if("" == signature)
{
  throw new Error("解析文件错误了");
  return;
}
var key:String = adjustmentData.readUTFBytes(4);

key值有很多种，这里只用了标示文本内容的TySh跟图层类型的lsct来举例。

switch(key)
{
case "TySh": //文本内容
{  len = adjustmentData.readUnsignedInt();

adjustmentData.readBytes(ba, 0, len);
    var version:int = ba.readShort();
    ba.position += 48;//跳过
    var ver1:int = ba.readShort();
    var ver2:int = ba.readInt();
    //descriptor
    len = ba.readInt()*2; //the string of unicode values, two bytes per character
    ba.position += len;
    len = ba.readInt();
    if(0 == len)
    {
        ba.position += 4;
    } 

var numOfItems:int = ba.readInt();
    var descripterKey:String;
    var typeTxt:String;
    for (var i:int = 0; i < numOfItems; i++) 
    { 
        descripterKey = ba.readUTFBytes(4);
        if("" == descripterKey)
        {
            descripterKey = ba.readUTFBytes(4);
        }
        typeTxt = ba.readUTFBytes(4);
        switch(descripterKey) 
        {
            case 'Txt ':
               textContent = parseUnicodeString(ba);
                           labelSheetVo = PsdUtil.psdVo.labelSheetDict[layerName];
                           isText = true;
                           break;
        }
    }
    break;
    }
    case "lsct": //文件夹判断
    {
        len = adjustmentData.readUnsignedInt();
        adjustmentData.readBytes(ba, 0, len);
        //0 = any other type of layer, 1 = open “folder”, 2 = closed “folder”, 3 = bounding section divider, hidden in the UI
        var type:int = ba.readUnsignedInt();
        _isFolder = (1 == type || 2 == type);    
        break;
    }

        //这几个在长度上有特殊的去读要求            
    case "lrFX": //Effects Layer info
    case "lfx2": //Object Based Effects Layer info 
    case "Patt": //Patterns ase "Anno": //Annotations
    {
        len = adjustmentData.readUnsignedInt();
        mode = len%4;
        if(0 != mode)
        {
            adjustmentData.readBytes(ba, 0, len + 4 - mode);
        }
        else
        {
            adjustmentData.readBytes(ba, 0, len);
        }
        break;
    }
    default:
    {
        len = adjustmentData.readUnsignedInt();
        adjustmentData.readBytes(ba, 0, len);
        break;
    }
}