swf文件格式解析入门(tag解析)
上文把文件头解析完成了,接下来就是解析标签
swf文件把所有的资源都打包在标签内部
如字体,位图,嵌入的2进制,代码等等
tag有两种类型,1种为短tag,1种为长tag
短tag的长度是小于63个字节的
短标签格式
RECORDHEADER (short)
Field Type Comment
TagCodeAndLength UI16 Upper 10 bits: tag type Lower 6 bits: tag length
高10位表示标签类型,低6位表示标签长度
长标签格式 长标签的TagCodeAndLength为0x3F (=63)
长标签使用Length来表示标签的长度
RECORDHEADER (long)
Field Type Comment
TagCodeAndLength UI16 Tag type and length of 0x3F Packed together as in short header
Length SI32 Length of tag
跟着标签头后面就是标签指定长度的数据
然后根据不同的标签类型来解析数据就可以了
每个tag读取结束后,后面的又重新字节对齐了,不用考虑剩余几个字节的问题
/**
* 读取tag类型,不移动position
* @param bytes
* @return
*/
private function readTagType(bytes:ByteArray):uint
{
var result:uint = bytes.readUnsignedShort();
result = result >> 6;
bytes.position -= 2;
return result;
}
/**
* 读取tag长度 不包括头本身占的长度
* @param bytes
* @return
*
*/
private function readTagLength(bytes:ByteArray):uint{
var tagLength:uint = (bytes.readUnsignedShort() & 0x3F);
if (tagLength == 0x3F){
tagLength = bytes.readUnsignedInt();
};
if (tagLength < 0){
throw (Error("SWFReader:无效的tag长度"));
};
return tagLength;
}
/**
* 读取tag列表
* @param bytes
*
*/
private function readTags(bytes:ByteArray):Array
{
var result:Array = [];
var tagType:uint;
var tagLength:uint;
var start:int;
var tag:Tag;
var cl:Class;
while(bytes.bytesAvailable > 0)
{
start = bytes.position;
tagType = readTagType(bytes);
tagLength = readTagLength(bytes);
cl = TagTypes.getTagClassByTagType(tagType);
if (cl == null)
{
trace("Tag Not Found, Type=" + tagType, tagLength);
bytes.position += tagLength;// 跳过长度
continue;
}
tag = new cl();
tag.tagType = tagType;
if( tagLength > 0)
bytes.readBytes(tag.data, 0, tagLength);
tag.data.endian = Endian.LITTLE_ENDIAN;
tag.data.position = 0;
// 调用解析方法
tag.parse();
result.push(tag);
if (tagType == TagTypes.TAG_END)
break;
}
return result;
}
// 所有的tag类型列表
package swf.file.tags
{
import com.the9.nbu.swf.file.tags.actions.*;
import com.the9.nbu.swf.file.tags.binary.*;
import com.the9.nbu.swf.file.tags.bitmaps.*;
import com.the9.nbu.swf.file.tags.buttons.*;
import com.the9.nbu.swf.file.tags.control.*;
import com.the9.nbu.swf.file.tags.displaylist.*;
import com.the9.nbu.swf.file.tags.font.*;
import com.the9.nbu.swf.file.tags.shapemorphing.*;
import com.the9.nbu.swf.file.tags.shapes.*;
import com.the9.nbu.swf.file.tags.sounds.*;
import com.the9.nbu.swf.file.tags.sprite.*;
import com.the9.nbu.swf.file.tags.text.*;
import com.the9.nbu.swf.file.tags.video.*;
import com.the9.nbu.swf.file.tags.unknown.*;
/**
* TagTypes
* @author 任冬
* $Id: TagTypes.as 499 2010-11-19 10:02:56Z rendong $
* @version 1.0
*/
public class TagTypes
{
// Flash 1 tags
public static const TAG_END:uint = 0;
public static const TAG_SHOWFRAME:uint = 1;
public static const TAG_DEFINESHAPE:uint = 2;
public static const TAG_FREECHARACTER:uint = 3;
public static const TAG_PLACEOBJECT:uint = 4;
public static const TAG_REMOVEOBJECT:uint = 5;
public static const TAG_DEFINEBITS:uint = 6;
public static const TAG_DEFINEBUTTON:uint = 7;
public static const TAG_JPEGTABLES:uint = 8;
public static const TAG_SETBACKGROUNDCOLOR:uint = 9;
public static const TAG_DEFINEFONT:uint = 10;
public static const TAG_DEFINETEXT:uint = 11;
public static const TAG_DOACTION:uint = 12;
public static const TAG_DEFINEFONTINFO:uint = 13;
public static const TAG_DEFINESOUND:uint = 14;
public static const TAG_STARTSOUND:uint = 15;
public static const TAG_STOPSOUND:uint = 16;
public static const TAG_DEFINEBUTTONSOUND:uint = 17;
public static const TAG_SOUNDSTREAMHEAD:uint = 18;
public static const TAG_SOUNDSTREAMBLOCK:uint = 19;
// Flash 2 tags
public static const TAG_DEFINEBITSLOSSLESS:uint = 20;
public static const TAG_DEFINEBITSJPEG2:uint = 21;
public static const TAG_DEFINESHAPE2:uint = 22;
public static const TAG_DEFINEBUTTONCXFORM:uint = 23;
public static const TAG_PROTECT:uint = 24;
public static const TAG_PATHSAREPOSTSCRIPT:uint = 25;
// Flash 3 tags
public static const TAG_PLACEOBJECT2:uint = 26;
public static const TAG_REMOVEOBJECT2:uint = 28;
public static const TAG_SYNCFRAME:uint = 29;
public static const TAG_FREEALL:uint = 31;
public static const TAG_DEFINESHAPE3:uint = 32;
public static const TAG_DEFINETEXT2:uint = 33;
public static const TAG_DEFINEBUTTON2:uint = 34;
public static const TAG_DEFINEBITSJPEG3:uint = 35;
public static const TAG_DEFINEBITSLOSSLESS2:uint = 36;
// Flash 4 tags
public static const TAG_DEFINEEDITTEXT:uint = 37;
public static const TAG_DEFINEVIDEO:uint = 38;
public static const TAG_DEFINESPRITE:uint = 39;
public static const TAG_NAMECHARACTER:uint = 40;
public static const TAG_PRODUCTINFO:uint = 41;
public static const TAG_DEFINETEXTFORMAT:uint = 42;
public static const TAG_FRAMELABEL:uint = 43;
// Flash 5 tags
public static const TAG_DEFINEBEHAVIOR:uint = 44;
public static const TAG_SOUNDSTREAMHEAD2:uint = 45;
public static const TAG_DEFINEMORPHSHAPE:uint = 46;
public static const TAG_FRAMETAG:uint = 47;
public static const TAG_DEFINEFONT2:uint = 48;
public static const TAG_GENCOMMAND:uint = 49;
public static const TAG_DEFINECOMMANDOBJ:uint = 50;
public static const TAG_CHARACTERSET:uint = 51;
public static const TAG_FONTREF:uint = 52;
public static const TAG_DEFINEFUNCTION:uint = 53;
public static const TAG_PLACEFUNCTION:uint = 54;
public static const TAG_GENTAGOBJECT:uint = 55;
public static const TAG_EXPORTASSETS:uint = 56;
public static const TAG_IMPORTASSETS:uint = 57;
public static const TAG_ENABLEDEBUGGER:uint = 58;
// Flash 6 tags
public static const TAG_DOINITACTION:uint = 59;
public static const TAG_DEFINEVIDEOSTREAM:uint = 60;
public static const TAG_VIDEOFRAME:uint = 61;
public static const TAG_DEFINEFONTINFO2:uint = 62;
public static const TAG_DEBUGID:uint = 63;
public static const TAG_ENABLEDEBUGGER2:uint = 64;
public static const TAG_SCRIPTLIMITS:uint = 65;
// Flash 7 tags
public static const TAG_SETTABINDEX:uint = 66;
// Flash 8 tags
public static const TAG_FILEATTRIBUTES:uint = 69;
public static const TAG_PLACEOBJECT3:uint = 70;
public static const TAG_IMPORTASSETS2:uint = 71;
public static const TAG_DOABC:uint = 72;
public static const TAG_DEFINEFONTALIGNZONES:uint = 73;
public static const TAG_CSMTEXTSETTINGS:uint = 74;
public static const TAG_DEFINEFONT3:uint = 75;
public static const TAG_SYMBOLCLASS:uint = 76;
public static const TAG_METADATA:uint = 77;
public static const TAG_SCALINGGRID:uint = 78;
public static const TAG_DOABC2:uint = 82;
public static const TAG_DEFINESHAPE4:uint = 83;
public static const TAG_DEFINEMORPHSHAPE2:uint = 84;
// Flash 9 tags
public static const TAG_DEFINESCENEANDFRAMELABELDATA:uint = 86;
public static const TAG_DEFINEBINARYDATA:uint = 87;
public static const TAG_DEFINEFONTNAME:uint = 88;
public static const TAG_STARTSOUND2:uint = 89;
public static const TAG_DEFINEBITSJPEG4:uint = 90;
// Flash 10 tags
public static const TAG_DEFINEFONT4:uint = 91;
/**
* tagType => tag 名称
*/
private static const TAG_NAMES:Array =["End","ShowFrame","DefineShape","FreeCharacter","PlaceObject","RemoveObject","DefineBits","DefineButton","JPEGTables","SetBackgroundColor","DefineFont","DefineText","DoAction","DefineFontInfo","DefineSound","StartSound","StopSound","DefineButtonSound","SoundStreamHead","SoundStreamBlock","DefineBitsLossless","DefineBitsJPEG2","DefineShape2","DefineButtonCxform","Protect","PathsArePostScript","PlaceObject2","27 (invalid)","RemoveObject2","SyncFrame","30 (invalid)","FreeAll","DefineShape3","DefineText2","DefineButton2","DefineBitsJPEG3","DefineBitsLossless2","DefineEditText","DefineVideo","DefineSprite","NameCharacter","ProductInfo","DefineTextFormat","FrameLabel","DefineBehavior","SoundStreamHead2","DefineMorphShape","FrameTag","DefineFont2","GenCommand","DefineCommandObj","CharacterSet","FontRef","DefineFunction","PlaceFunction","GenTagObject","ExportAssets","ImportAssets","EnableDebugger","DoInitAction","DefineVideoStream","VideoFrame","DefineFontInfo2","DebugID","EnableDebugger2","ScriptLimits","SetTabIndex","67 (invalid)","68 (invalid)","FileAttributes","PlaceObject3","ImportAssets2","DoABC","DefineFontAlignZones","CSMTextSettings","DefineFont3","SymbolClass","Metadata","ScalingGrid","79 (invalid)","80 (invalid)","81 (invalid)","DoABC2","DefineShape4","DefineMorphShape2","85 (invalid)","DefineSceneAndFrameLabelData","DefineBinaryData","DefineFontName","StartSound2","DefineBitsJPEG4","DefineFont4"];
/**
* tagType => tag class
*/
private static const TAG_CLASS:Array = [EndTag,ShowFrameTag,DefineShapeTag,FreeCharacterTag,PlaceObjectTag,RemoveObjectTag,DefineBitsTag,DefineButtonTag,JPEGTablesTag,SetBackgroundColorTag,DefineFontTag,DefineTextTag,DoActionTag,DefineFontInfoTag,DefineSoundTag,StartSoundTag,StopSoundTag,DefineButtonSoundTag,SoundStreamHeadTag,SoundStreamBlockTag,DefineBitsLosslessTag,DefineBitsJPEG2Tag,DefineShape2Tag,DefineButtonCxformTag,ProtectTag,PathsArePostScriptTag,PlaceObject2Tag,null,RemoveObject2Tag,SyncFrameTag,null,FreeAllTag,DefineShape3Tag,DefineText2Tag,DefineButton2Tag,DefineBitsJPEG3Tag,DefineBitsLossless2Tag,DefineEditTextTag,DefineVideoTag,DefineSpriteTag,NameCharacterTag,ProductInfoTag,DefineTextFormatTag,FrameLabelTag,DefineBehaviorTag,SoundStreamHead2Tag,DefineMorphShapeTag,FrameTagTag,DefineFont2Tag,GenCommandTag,DefineCommandObjTag,CharacterSetTag,FontRefTag,DefineFunctionTag,PlaceFunctionTag,GenTagObjectTag,ExportAssetsTag,ImportAssetsTag,EnableDebuggerTag,DoInitActionTag,DefineVideoStreamTag,VideoFrameTag,DefineFontInfo2Tag,DebugIDTag,EnableDebugger2Tag,ScriptLimitsTag,SetTabIndexTag,null,null,FileAttributesTag,PlaceObject3Tag,ImportAssets2Tag,DoABCTag,DefineFontAlignZonesTag,CSMTextSettingsTag,DefineFont3Tag,SymbolClassTag,MetadataTag,ScalingGridTag,null,null,null,DoABCTag,DefineShape4Tag,DefineMorphShape2Tag,null,DefineSceneAndFrameLabelDataTag,DefineBinaryDataTag,DefineFontNameTag,StartSound2Tag,DefineBitsJPEG4Tag,DefineFont4Tag];
/**
* 根据编号获取tag名称
* @param tagType
* @return
*
*/
public static function getTagNameByTagType(tagType:int):String
{
return TAG_NAMES[tagType] || null;
}
/**
* 根据变化获取tag class
* @param tagType
* @return
*
*/
public static function getTagClassByTagType(tagType:int):Class
{
return TAG_CLASS[tagType] || null;
}
}
}
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