mirror of
https://github.com/billsonnn/nitro-converter.git
synced 2024-06-28 19:45:33 +02:00
optimize zlib inflate, the old code would get stuck on malformed swfs
This commit is contained in:
BiFi2000
parent
32435a3c84
commit
7ce2438ea5
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@ -1,450 +1,432 @@
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/**
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* Simple module for reading SWF properties
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*
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* (c) 2014 Rafael Leal Dias <rafaeldias.c at gmail dot com>
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* MIT LICENCE
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*
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*/
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var fs = require('fs')
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, zlib = require('zlib')
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, lzma = require('lzma-purejs')
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, Stream = require('stream')
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, SWFBuffer = require('./lib/swf-buffer')
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, SWFTags = require('./lib/swf-tags')
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, SWFReader = exports;
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function readSWFTags(buff, swf) {
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var tags = []
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, tag
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, tagHeader
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, flag
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, l
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, sc
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, fc;
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/* Reads TagCodeAndLength from Tag's RECORDHEADER */
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while( (tagHeader = buff.readTagCodeAndLength()) ) {
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tag = {
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header : tagHeader
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};
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switch( tagHeader.code ) {
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case SWFTags.FileAttributes :
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flag = buff.readUIntLE(32);
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fileAttrs = {}
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fileAttrs.useNetwork = tag.useNetwork = !!(flag & 0x1);
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fileAttrs.as3 = tag.as3 = !!(flag & 0x8);
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fileAttrs.hasMetaData = tag.hasMetaData = !!(flag & 0x10);
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fileAttrs.useGPU = tag.useGPU = !!(flag & 0x20);
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fileAttrs.useDirectBit = tag.useDirectBlit = !!(flag & 0x40);
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swf.fileAttributes = fileAttrs;
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break;
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case SWFTags.Metadata :
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swf.metadata = tag.metadata = buff.readString()
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break;
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case SWFTags.SetBackgroundColor :
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tag.RGB = buff.readRGB();
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swf.backgroundColor = '#' + (tag.RGB[0]*65536 + tag.RGB[1]*256 + tag.RGB[0]).toString(16);
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break;
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case SWFTags.Protect :
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swf.protect = tagHeader.length && buff.readString();
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break;
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case SWFTags.DefineSceneAndFrameLabelData :
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sc = tag.sceneCount = buff.readEncodedU32();
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tag.scenes = [];
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while (sc--)
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tag.scenes.push({
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offset : buff.readEncodedU32(),
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name : buff.readString()
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});
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fc = tag.frameLabelCount = buff.readEncodedU32();
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tag.labels = [];
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while (fc--)
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tag.labels.push({
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frameNum : buff.readEncodedU32(),
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frameLabel : buff.readString()
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});
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break;
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/**
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* DefineShape4 extends the capabilities of
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* DefineShape3 by using a new line style
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* record in the shape
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*/
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//case SWFTags.DefineShape4 :
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// /* id for this character */
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// tag.ShapeId = buff.readUIntLE(16);
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// /* bounds of the shape */
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// tag.ShapeBounds = buff.readRect();
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// /* bounds of the shape, excluding the strokes */
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// tag.EdgeBounds = buff.readRect();
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// /* reserved, must be 0 */
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// if (0 !== buff.readBits(5))
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// throw new Error('Reserved bit used.');
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// /* if 1, use fill winding. >= SWF 10 */
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// if (swf.version >= 10)
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// tag.UsesFillWindingRule = buff.readBits(1);
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// /**
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// * if 1, shape contains at least one
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// * non-scaling stroke.
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// */
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// tag.UsesNonScallingStrokes = buff.readBits(1);
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// /**
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// * if 1, shape contains at least one
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// * scaling stroke
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// */
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// tag.UsesScalingStrokes = buff.readBits(1);
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// tag.shapes = buff.readShapeWithStyle();
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// break;
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case SWFTags.FrameLabel :
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tag.name = buff.readString()
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l = Buffer.byteLength(tag.name);
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/* check if it's an named anchor */
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if (l & (tagHeader.length - 1) != l)
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tag.anchor = buff.readUInt8();
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break;
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case SWFTags.DefineSprite :
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tag.SpriteID = buff.readUIntLE(16);
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tag.FrameCount = buff.readUIntLE(16);
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tag.ControlTags = readSWFTags(buff, swf);
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break;
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case SWFTags.ExportAssets :
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tag.count = buff.readUIntLE(16);
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tag.assets = [];
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l = 0;
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while (l++ < tag.count)
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tag.assets.push({
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id : buff.readUIntLE(16),
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name : buff.readString()
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});
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break;
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case SWFTags.ImportAssets :
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/**
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* URL where the source SWF file can be found
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*/
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tag.url = buff.readString();
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/**
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* Number of assets to import
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*/
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tag.count = buff.readUIntLE(16);
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tag.assets = [];
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l = 0;
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while (l++ < tag.count)
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tag.assets.push({
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/**
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* Character ID for the l-th item
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* in importing SWF file
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*/
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id : buff.readUIntLE(16),
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/**
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* Identifies for the l-th
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* imported character
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*/
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name : buff.readString()
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});
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break;
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case SWFTags.ImportAssets2 :
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tag.url = buff.readString();
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if ( !(1 === buff.readUInt8() && 0 === buff.readUInt8()) ) {
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throw new Error('Reserved bits for ImportAssets2 used');
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}
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tag.count = buff.readUIntLE(16);
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tag.assets = [];
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l = 0;
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while (l++ < tag.count)
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tag.assets({
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id : buff.readUIntLE(16),
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name : buff.readString()
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});
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break;
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case SWFTags.EnableDebbuger :
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tag.password = buff.readString()
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break;
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case SWFTags.EnableDebugger2 :
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if (0 !== buff.readUIntLE(16)) {
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//throw new Error('Reserved bit for EnableDebugger2 used.');
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}
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tag.password = buff.readString()
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break;
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case SWFTags.ScriptLimits :
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/**
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* Maximum recursion Depth
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*/
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tag.maxRecursionDepth = buff.readUIntLE(16);
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/**
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* Maximum ActionScript processing time before script
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* stuck dialog box displays
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*/
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tag.scriptTimeoutSeconds = buff.readUIntLE(16);
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break;
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case SWFTags.SymbolClass :
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tag.numSymbols = buff.readUIntLE(16);
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tag.symbols = [];
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l = 0;
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while (l++ < tag.numSymbols)
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tag.symbols.push({
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id : buff.readUIntLE(16),
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name : buff.readString()
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});
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break;
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case SWFTags.DefineScalingGrid :
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tag.characterId = buff.readUIntLE(16);
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tag.splitter = buff.readRect();
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break;
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case SWFTags.setTabIndex :
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tag.depth = buff.readUIntLE(16);
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tag.tabIndex = buff.readUIntLE(16);
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break;
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case SWFTags.JPEGTables:
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tag.jpegData = buff.buffer.slice(buff.pointer, buff.pointer + tagHeader.length);
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buff.pointer += tagHeader.length;
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break;
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case SWFTags.DefineBits:
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tag.characterId = buff.readUIntLE(16);
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tag.jpegData = buff.buffer.slice(buff.pointer, buff.pointer + tagHeader.length - 2);
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buff.pointer += tagHeader.length - 2;
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break;
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case SWFTags.DefineBitsJPEG2:
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tag.characterId = buff.readUIntLE(16);
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tag.imageData = buff.buffer.slice(buff.pointer, buff.pointer + tagHeader.length - 2);
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buff.pointer += tagHeader.length - 2;
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break;
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case SWFTags.DefineBitsJPEG3:
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tag.characterId = buff.readUIntLE(16);
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var alphaDataOffset = buff.readUIntLE(32);
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tag.imageData = buff.buffer.slice(buff.pointer, buff.pointer + alphaDataOffset);
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buff.pointer += alphaDataOffset;
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var restLength = tagHeader.length - 6 - alphaDataOffset;
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tag.bitmapAlphaData = buff.buffer.slice(buff.pointer, buff.pointer + restLength);
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buff.pointer += restLength;
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break;
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case SWFTags.DefineBitsJPEG4:
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tag.characterId = buff.readUIntLE(16);
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var alphaDataOffset = buff.readUIntLE(32);
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tag.deblockParam = buff.readUIntLE(16);
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tag.imageData = buff.buffer.slice(buff.pointer, buff.pointer + alphaDataOffset);
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buff.pointer += alphaDataOffset;
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var restLength = tagHeader.length - 8 - alphaDataOffset;
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tag.bitmapAlphaData = buff.buffer.slice(buff.pointer, buff.pointer + restLength);
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buff.pointer += restLength;
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break;
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case SWFTags.DefineBitsLossless:
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case SWFTags.DefineBitsLossless2:
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tag.characterId = buff.readUIntLE(16);
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tag.bitmapFormat = buff.readUInt8();
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tag.bitmapWidth = buff.readUIntLE(16);
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tag.bitmapHeight = buff.readUIntLE(16);
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var restLength = tagHeader.length - 7;
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if (tag.bitmapFormat == 3) {
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tag.bitmapColorTableSize = buff.readUInt8();
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restLength--;
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}
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tag.zlibBitmapData = buff.buffer.slice(buff.pointer, buff.pointer + restLength);
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buff.pointer += restLength;
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break;
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default:
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tag.data = buff.buffer.slice(buff.pointer, buff.pointer + tagHeader.length);
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buff.pointer += tagHeader.length;
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break;
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}
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tags.push(tag);
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}
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return tags;
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}
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/**
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* Reads tags and their contents, passaing a SWF object to callback
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*
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* @param {SWFBuffer} buff
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* @param {Buffer} compressed_buff
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* @param {function} callback
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* @api private
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*
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*/
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function readSWFBuff(buff, compressed_buff, next) {
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buff.seek(3);// start
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if (buff.length < 9) {
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if (isSync) throw new Error("Buffer is to small, must be greater than 9 bytes.");
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return next(new Error("Buffer is to small, must be greater than 9 bytes."));
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}
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var swf = {
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version : buff.readUInt8(),
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fileLength : {
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compressed : compressed_buff.length,
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uncompressed : buff.readUIntLE(32)
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},
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frameSize : buff.readRect(), // Returns a RECT object. i.e : { x : 0, y : 0, width : 200, height: 300 }
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frameRate : buff.readUIntLE(16)/256,
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frameCount : buff.readUIntLE(16)
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}
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, isSync = 'function' !== typeof next;
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try {
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swf.tags = readSWFTags(buff, swf);
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} catch(e) {
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if (isSync) throw e;
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return next(e);
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}
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return isSync && swf || next( null, swf );
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}
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/**
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* Concat SWF Header with uncompressed Buffer
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*
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* @param {Buffer|ArrayBuffer} buff
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* @param {Buffer|ArrayBuffer} swf
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*/
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function concatSWFHeader(buff, swf) {
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return Buffer.concat([swf.slice(0, 8), buff]);
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}
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/**
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* Uncompress SWF and start reading it
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*
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* @param {Buffer|ArrayBuffer} swf
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* @param {function} callback
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*
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*/
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function uncompress(swf, next) {
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var compressed_buff = swf.slice(8)
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, uncompressed_buff
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, isSync = 'function' !== typeof next
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, e;
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// uncompress buffer
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switch( swf[0] ) {
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case 0x43 : // zlib compressed
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if (isSync) {
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uncompressed_buff = concatSWFHeader(zlib.unzipSync(compressed_buff), swf);
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return readSWFBuff(new SWFBuffer(uncompressed_buff), swf);
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}
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const newBuffer = swf.slice(4);
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const uncompressedLength = newBuffer.readUInt32LE();
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const chunks = [];
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let readLength = 0;
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var decompressStream = zlib.createInflate()
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.on('data', function (chunk) {
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readLength += chunk.length;
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chunks.push(chunk);
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if (uncompressedLength - 8 === readLength) {
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decompressStream.close();
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}
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//decompressStream.pause();
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}).on('error', function(err) {
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console.log(err);
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//next(err);
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}).on('close', function() {
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readSWFBuff(new SWFBuffer( Buffer.concat(chunks) ), swf, next);
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});
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decompressStream.write(compressed_buff);
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break;
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case 0x46 : // uncompressed
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return readSWFBuff(new SWFBuffer( swf ), swf, next);
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break;
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case 0x5a : // LZMA compressed
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var lzmaProperties = compressed_buff.slice(4, 9);
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compressed_buff = compressed_buff.slice(9);
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var input_stream = new Stream();
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input_stream.pos = 0;
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input_stream.readByte = function() {
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return this.pos >= compressed_buff.length ? -1 : compressed_buff[this.pos++];
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};
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var output_stream = new Stream();
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output_stream.buffer = new Buffer(16384);
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output_stream.pos = 0;
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output_stream.writeByte = function(_byte) {
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if (this.pos >= this.buffer.length) {
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var newBuffer = new Buffer(this.buffer.length * 2);
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this.buffer.copy(newBuffer);
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this.buffer = newBuffer;
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}
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this.buffer[this.pos++] = _byte;
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};
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output_stream.getBuffer = function() {
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// trim buffer
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if (this.pos !== this.buffer.length) {
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var newBuffer = new Buffer(this.pos);
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this.buffer.copy(newBuffer, 0, 0, this.pos);
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this.buffer = newBuffer;
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}
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return this.buffer;
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};
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lzma.decompress(lzmaProperties, input_stream, output_stream, -1);
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uncompressed_buff = Buffer.concat([swf.slice(0, 8), output_stream.getBuffer()]);
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return readSWFBuff(new SWFBuffer(uncompressed_buff), swf, next);
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break;
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default :
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e = new Error('Unknown SWF compressions');
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|
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if (isSync) {
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throw e;
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} else {
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next(e);
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}
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};
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};
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/**
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* Check if file is Buffer or ArrayBuffer
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*
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* @param {Buffer|ArrayBuffer) b
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* @api private
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*
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*/
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function isBuffer(b) {
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return typeof Buffer !== "undefined" && Buffer.isBuffer(b) || b instanceof ArrayBuffer;
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}
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/* Exposes Tags constants */
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SWFReader.TAGS = SWFTags;
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/**
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* Reads SWF file
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*
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* @param {String|Buffer}} file
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* @param {function} next - if not a function, uses synchronous algorithm
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* @api public
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*
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*/
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SWFReader.read = SWFReader.readSync = function(file, next) {
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if (isBuffer(file)) {
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/* File is already a buffer */
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return uncompress(file, next);
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} else {
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/* Get the buffer */
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if ('function' === typeof next) {
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fs.readFile(file, function(err, swf) {
|
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if ( err ) {
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next(err);
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return;
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}
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uncompress(swf, next);
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});
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} else {
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return uncompress(fs.readFileSync(file));
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}
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}
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};
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/**
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* Simple module for reading SWF properties
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*
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* (c) 2014 Rafael Leal Dias <rafaeldias.c at gmail dot com>
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* MIT LICENCE
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*
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*/
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|
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var fs = require('fs')
|
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, zlib = require('zlib')
|
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, lzma = require('lzma-purejs')
|
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, Stream = require('stream')
|
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, SWFBuffer = require('./lib/swf-buffer')
|
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, SWFTags = require('./lib/swf-tags')
|
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, SWFReader = exports;
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|
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function readSWFTags(buff, swf) {
|
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var tags = []
|
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, tag
|
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, tagHeader
|
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, flag
|
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, l
|
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, sc
|
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, fc;
|
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|
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/* Reads TagCodeAndLength from Tag's RECORDHEADER */
|
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while( (tagHeader = buff.readTagCodeAndLength()) ) {
|
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tag = {
|
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header : tagHeader
|
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};
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switch( tagHeader.code ) {
|
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case SWFTags.FileAttributes :
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flag = buff.readUIntLE(32);
|
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fileAttrs = {}
|
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|
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fileAttrs.useNetwork = tag.useNetwork = !!(flag & 0x1);
|
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fileAttrs.as3 = tag.as3 = !!(flag & 0x8);
|
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fileAttrs.hasMetaData = tag.hasMetaData = !!(flag & 0x10);
|
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fileAttrs.useGPU = tag.useGPU = !!(flag & 0x20);
|
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fileAttrs.useDirectBit = tag.useDirectBlit = !!(flag & 0x40);
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swf.fileAttributes = fileAttrs;
|
||||
break;
|
||||
case SWFTags.Metadata :
|
||||
swf.metadata = tag.metadata = buff.readString()
|
||||
break;
|
||||
case SWFTags.SetBackgroundColor :
|
||||
tag.RGB = buff.readRGB();
|
||||
swf.backgroundColor = '#' + (tag.RGB[0]*65536 + tag.RGB[1]*256 + tag.RGB[0]).toString(16);
|
||||
break;
|
||||
case SWFTags.Protect :
|
||||
swf.protect = tagHeader.length && buff.readString();
|
||||
break;
|
||||
case SWFTags.DefineSceneAndFrameLabelData :
|
||||
sc = tag.sceneCount = buff.readEncodedU32();
|
||||
tag.scenes = [];
|
||||
|
||||
while (sc--)
|
||||
tag.scenes.push({
|
||||
offset : buff.readEncodedU32(),
|
||||
name : buff.readString()
|
||||
});
|
||||
|
||||
fc = tag.frameLabelCount = buff.readEncodedU32();
|
||||
tag.labels = [];
|
||||
|
||||
while (fc--)
|
||||
tag.labels.push({
|
||||
frameNum : buff.readEncodedU32(),
|
||||
frameLabel : buff.readString()
|
||||
});
|
||||
break;
|
||||
/**
|
||||
* DefineShape4 extends the capabilities of
|
||||
* DefineShape3 by using a new line style
|
||||
* record in the shape
|
||||
*/
|
||||
//case SWFTags.DefineShape4 :
|
||||
// /* id for this character */
|
||||
// tag.ShapeId = buff.readUIntLE(16);
|
||||
// /* bounds of the shape */
|
||||
// tag.ShapeBounds = buff.readRect();
|
||||
// /* bounds of the shape, excluding the strokes */
|
||||
// tag.EdgeBounds = buff.readRect();
|
||||
// /* reserved, must be 0 */
|
||||
// if (0 !== buff.readBits(5))
|
||||
// throw new Error('Reserved bit used.');
|
||||
// /* if 1, use fill winding. >= SWF 10 */
|
||||
// if (swf.version >= 10)
|
||||
// tag.UsesFillWindingRule = buff.readBits(1);
|
||||
// /**
|
||||
// * if 1, shape contains at least one
|
||||
// * non-scaling stroke.
|
||||
// */
|
||||
// tag.UsesNonScallingStrokes = buff.readBits(1);
|
||||
// /**
|
||||
// * if 1, shape contains at least one
|
||||
// * scaling stroke
|
||||
// */
|
||||
// tag.UsesScalingStrokes = buff.readBits(1);
|
||||
// tag.shapes = buff.readShapeWithStyle();
|
||||
// break;
|
||||
case SWFTags.FrameLabel :
|
||||
tag.name = buff.readString()
|
||||
l = Buffer.byteLength(tag.name);
|
||||
/* check if it's an named anchor */
|
||||
if (l & (tagHeader.length - 1) != l)
|
||||
tag.anchor = buff.readUInt8();
|
||||
break;
|
||||
case SWFTags.DefineSprite :
|
||||
tag.SpriteID = buff.readUIntLE(16);
|
||||
tag.FrameCount = buff.readUIntLE(16);
|
||||
tag.ControlTags = readSWFTags(buff, swf);
|
||||
break;
|
||||
case SWFTags.ExportAssets :
|
||||
tag.count = buff.readUIntLE(16);
|
||||
tag.assets = [];
|
||||
|
||||
l = 0;
|
||||
|
||||
while (l++ < tag.count)
|
||||
tag.assets.push({
|
||||
id : buff.readUIntLE(16),
|
||||
name : buff.readString()
|
||||
});
|
||||
break;
|
||||
case SWFTags.ImportAssets :
|
||||
/**
|
||||
* URL where the source SWF file can be found
|
||||
*/
|
||||
tag.url = buff.readString();
|
||||
/**
|
||||
* Number of assets to import
|
||||
*/
|
||||
tag.count = buff.readUIntLE(16);
|
||||
tag.assets = [];
|
||||
|
||||
l = 0;
|
||||
|
||||
while (l++ < tag.count)
|
||||
tag.assets.push({
|
||||
/**
|
||||
* Character ID for the l-th item
|
||||
* in importing SWF file
|
||||
*/
|
||||
id : buff.readUIntLE(16),
|
||||
/**
|
||||
* Identifies for the l-th
|
||||
* imported character
|
||||
*/
|
||||
name : buff.readString()
|
||||
});
|
||||
break;
|
||||
case SWFTags.ImportAssets2 :
|
||||
tag.url = buff.readString();
|
||||
|
||||
if ( !(1 === buff.readUInt8() && 0 === buff.readUInt8()) ) {
|
||||
throw new Error('Reserved bits for ImportAssets2 used');
|
||||
}
|
||||
|
||||
tag.count = buff.readUIntLE(16);
|
||||
tag.assets = [];
|
||||
|
||||
l = 0;
|
||||
|
||||
while (l++ < tag.count)
|
||||
tag.assets({
|
||||
id : buff.readUIntLE(16),
|
||||
name : buff.readString()
|
||||
});
|
||||
break;
|
||||
case SWFTags.EnableDebbuger :
|
||||
tag.password = buff.readString()
|
||||
break;
|
||||
case SWFTags.EnableDebugger2 :
|
||||
if (0 !== buff.readUIntLE(16)) {
|
||||
//throw new Error('Reserved bit for EnableDebugger2 used.');
|
||||
}
|
||||
tag.password = buff.readString()
|
||||
break;
|
||||
case SWFTags.ScriptLimits :
|
||||
/**
|
||||
* Maximum recursion Depth
|
||||
*/
|
||||
tag.maxRecursionDepth = buff.readUIntLE(16);
|
||||
/**
|
||||
* Maximum ActionScript processing time before script
|
||||
* stuck dialog box displays
|
||||
*/
|
||||
tag.scriptTimeoutSeconds = buff.readUIntLE(16);
|
||||
break;
|
||||
case SWFTags.SymbolClass :
|
||||
tag.numSymbols = buff.readUIntLE(16);
|
||||
tag.symbols = [];
|
||||
|
||||
l = 0;
|
||||
|
||||
while (l++ < tag.numSymbols)
|
||||
tag.symbols.push({
|
||||
id : buff.readUIntLE(16),
|
||||
name : buff.readString()
|
||||
});
|
||||
break;
|
||||
case SWFTags.DefineScalingGrid :
|
||||
tag.characterId = buff.readUIntLE(16);
|
||||
tag.splitter = buff.readRect();
|
||||
break;
|
||||
case SWFTags.setTabIndex :
|
||||
tag.depth = buff.readUIntLE(16);
|
||||
tag.tabIndex = buff.readUIntLE(16);
|
||||
break;
|
||||
case SWFTags.JPEGTables:
|
||||
tag.jpegData = buff.buffer.slice(buff.pointer, buff.pointer + tagHeader.length);
|
||||
buff.pointer += tagHeader.length;
|
||||
break;
|
||||
case SWFTags.DefineBits:
|
||||
tag.characterId = buff.readUIntLE(16);
|
||||
tag.jpegData = buff.buffer.slice(buff.pointer, buff.pointer + tagHeader.length - 2);
|
||||
buff.pointer += tagHeader.length - 2;
|
||||
break;
|
||||
case SWFTags.DefineBitsJPEG2:
|
||||
tag.characterId = buff.readUIntLE(16);
|
||||
tag.imageData = buff.buffer.slice(buff.pointer, buff.pointer + tagHeader.length - 2);
|
||||
buff.pointer += tagHeader.length - 2;
|
||||
break;
|
||||
case SWFTags.DefineBitsJPEG3:
|
||||
tag.characterId = buff.readUIntLE(16);
|
||||
var alphaDataOffset = buff.readUIntLE(32);
|
||||
tag.imageData = buff.buffer.slice(buff.pointer, buff.pointer + alphaDataOffset);
|
||||
buff.pointer += alphaDataOffset;
|
||||
var restLength = tagHeader.length - 6 - alphaDataOffset;
|
||||
tag.bitmapAlphaData = buff.buffer.slice(buff.pointer, buff.pointer + restLength);
|
||||
buff.pointer += restLength;
|
||||
break;
|
||||
case SWFTags.DefineBitsJPEG4:
|
||||
tag.characterId = buff.readUIntLE(16);
|
||||
var alphaDataOffset = buff.readUIntLE(32);
|
||||
tag.deblockParam = buff.readUIntLE(16);
|
||||
tag.imageData = buff.buffer.slice(buff.pointer, buff.pointer + alphaDataOffset);
|
||||
buff.pointer += alphaDataOffset;
|
||||
var restLength = tagHeader.length - 8 - alphaDataOffset;
|
||||
tag.bitmapAlphaData = buff.buffer.slice(buff.pointer, buff.pointer + restLength);
|
||||
buff.pointer += restLength;
|
||||
break;
|
||||
case SWFTags.DefineBitsLossless:
|
||||
case SWFTags.DefineBitsLossless2:
|
||||
tag.characterId = buff.readUIntLE(16);
|
||||
tag.bitmapFormat = buff.readUInt8();
|
||||
tag.bitmapWidth = buff.readUIntLE(16);
|
||||
tag.bitmapHeight = buff.readUIntLE(16);
|
||||
var restLength = tagHeader.length - 7;
|
||||
if (tag.bitmapFormat == 3) {
|
||||
tag.bitmapColorTableSize = buff.readUInt8();
|
||||
restLength--;
|
||||
}
|
||||
tag.zlibBitmapData = buff.buffer.slice(buff.pointer, buff.pointer + restLength);
|
||||
buff.pointer += restLength;
|
||||
break;
|
||||
default:
|
||||
tag.data = buff.buffer.slice(buff.pointer, buff.pointer + tagHeader.length);
|
||||
buff.pointer += tagHeader.length;
|
||||
break;
|
||||
}
|
||||
tags.push(tag);
|
||||
}
|
||||
return tags;
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads tags and their contents, passaing a SWF object to callback
|
||||
*
|
||||
* @param {SWFBuffer} buff
|
||||
* @param {Buffer} compressed_buff
|
||||
* @param {function} callback
|
||||
* @api private
|
||||
*
|
||||
*/
|
||||
function readSWFBuff(buff, compressed_buff, next) {
|
||||
buff.seek(3);// start
|
||||
|
||||
if (buff.length < 9) {
|
||||
if (isSync) throw new Error("Buffer is to small, must be greater than 9 bytes.");
|
||||
return next(new Error("Buffer is to small, must be greater than 9 bytes."));
|
||||
}
|
||||
var swf = {
|
||||
version : buff.readUInt8(),
|
||||
fileLength : {
|
||||
compressed : compressed_buff.length,
|
||||
uncompressed : buff.readUIntLE(32)
|
||||
},
|
||||
frameSize : buff.readRect(), // Returns a RECT object. i.e : { x : 0, y : 0, width : 200, height: 300 }
|
||||
frameRate : buff.readUIntLE(16)/256,
|
||||
frameCount : buff.readUIntLE(16)
|
||||
}
|
||||
, isSync = 'function' !== typeof next;
|
||||
|
||||
try {
|
||||
swf.tags = readSWFTags(buff, swf);
|
||||
} catch(e) {
|
||||
if (isSync) throw e;
|
||||
return next(e);
|
||||
}
|
||||
|
||||
return isSync && swf || next( null, swf );
|
||||
}
|
||||
|
||||
/**
|
||||
* Concat SWF Header with uncompressed Buffer
|
||||
*
|
||||
* @param {Buffer|ArrayBuffer} buff
|
||||
* @param {Buffer|ArrayBuffer} swf
|
||||
*/
|
||||
function concatSWFHeader(buff, swf) {
|
||||
return Buffer.concat([swf.slice(0, 8), buff]);
|
||||
}
|
||||
|
||||
/**
|
||||
* Uncompress SWF and start reading it
|
||||
*
|
||||
* @param {Buffer|ArrayBuffer} swf
|
||||
* @param {function} callback
|
||||
*
|
||||
*/
|
||||
function uncompress(swf, next) {
|
||||
var compressed_buff = swf.slice(8)
|
||||
, uncompressed_buff
|
||||
, isSync = 'function' !== typeof next
|
||||
, e;
|
||||
|
||||
// uncompress buffer
|
||||
switch( swf[0] ) {
|
||||
case 0x43 : // zlib compressed
|
||||
if (isSync) {
|
||||
uncompressed_buff = concatSWFHeader(zlib.unzipSync(compressed_buff), swf);
|
||||
return readSWFBuff(new SWFBuffer(uncompressed_buff), swf);
|
||||
}
|
||||
|
||||
zlib.inflate(compressed_buff, function(err, buf) {
|
||||
readSWFBuff(new SWFBuffer(buf), swf, next);
|
||||
});
|
||||
break;
|
||||
case 0x46 : // uncompressed
|
||||
return readSWFBuff(new SWFBuffer( swf ), swf, next);
|
||||
break;
|
||||
case 0x5a : // LZMA compressed
|
||||
var lzmaProperties = compressed_buff.slice(4, 9);
|
||||
compressed_buff = compressed_buff.slice(9);
|
||||
|
||||
var input_stream = new Stream();
|
||||
input_stream.pos = 0;
|
||||
input_stream.readByte = function() {
|
||||
return this.pos >= compressed_buff.length ? -1 : compressed_buff[this.pos++];
|
||||
};
|
||||
|
||||
var output_stream = new Stream();
|
||||
output_stream.buffer = new Buffer(16384);
|
||||
output_stream.pos = 0;
|
||||
output_stream.writeByte = function(_byte) {
|
||||
if (this.pos >= this.buffer.length) {
|
||||
var newBuffer = new Buffer(this.buffer.length * 2);
|
||||
this.buffer.copy(newBuffer);
|
||||
this.buffer = newBuffer;
|
||||
}
|
||||
this.buffer[this.pos++] = _byte;
|
||||
};
|
||||
output_stream.getBuffer = function() {
|
||||
// trim buffer
|
||||
if (this.pos !== this.buffer.length) {
|
||||
var newBuffer = new Buffer(this.pos);
|
||||
this.buffer.copy(newBuffer, 0, 0, this.pos);
|
||||
this.buffer = newBuffer;
|
||||
}
|
||||
return this.buffer;
|
||||
};
|
||||
|
||||
lzma.decompress(lzmaProperties, input_stream, output_stream, -1);
|
||||
uncompressed_buff = Buffer.concat([swf.slice(0, 8), output_stream.getBuffer()]);
|
||||
|
||||
return readSWFBuff(new SWFBuffer(uncompressed_buff), swf, next);
|
||||
break;
|
||||
default :
|
||||
e = new Error('Unknown SWF compressions');
|
||||
|
||||
if (isSync) {
|
||||
throw e;
|
||||
} else {
|
||||
next(e);
|
||||
}
|
||||
};
|
||||
};
|
||||
|
||||
/**
|
||||
* Check if file is Buffer or ArrayBuffer
|
||||
*
|
||||
* @param {Buffer|ArrayBuffer) b
|
||||
* @api private
|
||||
*
|
||||
*/
|
||||
function isBuffer(b) {
|
||||
return typeof Buffer !== "undefined" && Buffer.isBuffer(b) || b instanceof ArrayBuffer;
|
||||
}
|
||||
|
||||
/* Exposes Tags constants */
|
||||
SWFReader.TAGS = SWFTags;
|
||||
|
||||
/**
|
||||
* Reads SWF file
|
||||
*
|
||||
* @param {String|Buffer}} file
|
||||
* @param {function} next - if not a function, uses synchronous algorithm
|
||||
* @api public
|
||||
*
|
||||
*/
|
||||
SWFReader.read = SWFReader.readSync = function(file, next) {
|
||||
if (isBuffer(file)) {
|
||||
/* File is already a buffer */
|
||||
return uncompress(file, next);
|
||||
} else {
|
||||
/* Get the buffer */
|
||||
if ('function' === typeof next) {
|
||||
fs.readFile(file, function(err, swf) {
|
||||
if ( err ) {
|
||||
next(err);
|
||||
return;
|
||||
}
|
||||
uncompress(swf, next);
|
||||
});
|
||||
} else {
|
||||
return uncompress(fs.readFileSync(file));
|
||||
}
|
||||
}
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user