Add the necessary bits to handle Arrays, Procedure and a bigger set of instructions for Type1
This commit is contained in:
Vivien Nicolas
parent
e739bcc515
commit
e302bd93ee
427
PDFFont.js
427
PDFFont.js
@ -1,9 +1,11 @@
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var Font = new Dict();
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var Type1Parser = function(aAsciiStream, aBinaryStream) {
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var lexer = new Lexer(aAsciiStream);
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// Turn on this flag for additional debugging logs
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var debug = false;
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var debug = true;
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var dump = function(aData) {
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if (debug)
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@ -190,7 +192,7 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
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userDict = new Dict();
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var dictionaryStack = {
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__innerStack__: [systemDict, globalDict],
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__innerStack__: [systemDict, globalDict, userDict],
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push: function(aDictionary) {
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this.__innerStack__.push(aDictionary);
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@ -216,7 +218,7 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
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get length() {
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return this.__innerStack__.length;
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}
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}
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};
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/*
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* The execution stack holds executable objects (mainly procedures and files)
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@ -252,7 +254,7 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
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get length() {
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return this.__innerStack__.length;
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}
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}
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};
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function nextInStack() {
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var currentProcedure = executionStack.peek();
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@ -260,11 +262,18 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
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var command = currentProcedure.shift();
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if (!currentProcedure.length)
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executionStack.pop();
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return command;
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}
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return lexer.getObj();
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}
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};
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var self = this;
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function parseNext() {
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setTimeout(function() {
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self.getObj();
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}, 0);
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};
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/*
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* Parse a font file from the first segment to the last assuming the eexec
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@ -274,181 +283,274 @@ var Type1Parser = function(aAsciiStream, aBinaryStream) {
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*/
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this.getObj = function() {
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var obj = nextInStack();
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if (operandIsArray && !IsCmd(obj, "{") && !IsCmd(obj, "[") &&
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!IsCmd(obj, "}") && !IsCmd(obj, "]")) {
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dump("Adding: " + obj);
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operandStack.peek().push(obj);
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this.getObj();
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} else if (IsCmd(obj, "{") || IsCmd(obj, "[")) {
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dump("Start" + (obj.cmd == "{" ? " Executable " : " ") + "Array");
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operandIsArray ? operandStack.peek().push([]) : operandStack.push([]);
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operandIsArray++;
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this.getObj();
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} else if (IsCmd(obj, "}") || IsCmd(obj, "]")) {
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dump("End" + (obj.cmd == "}" ? " Executable " : " ") + "Array");
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operandIsArray--;
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this.getObj();
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} else if (IsCmd(obj, "if")) {
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log("if");
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var procedure = operandStack.pop();
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var bool = operandStack.pop();
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if (!IsBool(bool)) {
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executionStack.push(bool);
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log(".....");
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this.getObj();
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}
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log(bool);
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if (bool)
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executionStack.push(procedure);
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!IsCmd(obj, "]") && !IsCmd(obj, "}")) {
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dump("Adding an object: " + obj +" to array " + operandIsArray);
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var currentArray = operandStack.peek();
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for (var i = 1; i < operandIsArray; i++)
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currentArray = currentArray[currentArray.length - 1];
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this.getObj();
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} else if (IsCmd(obj, "ifelse")) {
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log("ifelse");
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var procedure1 = operandStack.pop();
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var procedure2 = operandStack.pop();
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var bool = !!operandStack.pop();
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operandStack.push(bool ? procedure1 : procedure2);
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this.getObj();
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currentArray.push(obj);
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return parseNext();
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} else if (IsBool(obj) || IsInt(obj) || IsNum(obj) || IsString(obj)) {
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dump("Value: " + obj);
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operandStack.push(obj);
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this.getObj();
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} else if (IsCmd(obj, "dup")) {
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dump("Duplicate");
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operandStack.push(operandStack.peek());
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this.getObj();
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} else if (IsCmd(obj, "put") || IsCmd(obj, "NP")) {
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operandStack.toString();
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var data = operandStack.pop();
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var indexOrKey = operandStack.pop();
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var object = operandStack.pop();
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log(object);
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log("put " + data + " in " + obj + "[" + indexOrKey + "]");
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if (object.set)
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object.set(indexOrKey, data);
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else
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object[indexOrKey] = data;
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this.getObj();
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} else if (IsCmd(obj, "currentdict")) {
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dump("currentdict");
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operandStack.push(dictionaryStack.peek());
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this.getObj();
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} else if (IsCmd(obj, "systemdict")) {
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dump("systemdict");
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operandStack.push(systemDict);
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this.getObj();
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} else if (IsCmd(obj, "readonly") || IsCmd(obj, "executeonly") ||
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IsCmd(obj, "noaccess") || IsCmd(obj, "currentfile")) {
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// Do nothing for the moment
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this.getObj();
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return parseNext();
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} else if (IsName(obj)) {
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//dump("Name: " + obj.name);
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dump("Name: " + obj.name);
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operandStack.push(obj.name);
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this.getObj();
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} else if (IsCmd(obj, "array")) {
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var size = operandStack.pop();
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var array = new Array(size);
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operandStack.push(array);
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this.getObj();
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} else if (IsCmd(obj, "dict")) {
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dump("Dict: " + obj);
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var size = operandStack.pop();
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var dict = new Dict(size);
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operandStack.push(dict);
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this.getObj();
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} else if (IsCmd(obj, "begin")) {
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dump("begin a dictionary");
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dictionaryStack.push(operandStack.pop());
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this.getObj();
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} else if (IsCmd(obj, "end")) {
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dump("Ending a dictionary");
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dictionaryStack.pop();
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this.getObj();
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} else if (IsCmd(obj, "def") || IsCmd(obj, "ND")) {
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var value = operandStack.pop();
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var key = operandStack.pop();
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log("def: " + key + " = " + value);
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dictionaryStack.peek().set(key, value);
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this.getObj();
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} else if (IsCmd(obj, "eexec")) {
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// All the first segment data has been read, decrypt the second segment
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// and start interpreting it in order to decode it
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var eexecString = decrypt(aBinaryStream, kEexecEncryptionKey, 4).join("");
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lexer = new Lexer(new StringStream(eexecString));
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return parseNext();
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} else if (IsCmd(obj)) {
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var command = obj.cmd;
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dump(command);
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this.getObj();
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} else if (IsCmd(obj, "known")) {
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dump("known");
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var name = operandStack.pop();
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var dict = operandStack.pop();
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operandStack.push(!!dict.get(name));
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this.getObj();
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} else if (IsCmd(obj, "RD")) {
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dump("RD");
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var size = operandStack.pop();
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var key = operandStack.pop();
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switch (command) {
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case "[":
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case "{":
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dump("Start" + (command == "{" ? " Executable " : " ") + "Array");
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operandIsArray++;
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var currentArray = operandStack;
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for (var i = 1; i < operandIsArray; i++)
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if (currentArray.peek)
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currentArray = currentArray.peek();
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else
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currentArray = currentArray[currentArray.length - 1];
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currentArray.push([]);
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break;
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// Add '1' because of the space separator, this is dirty
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var stream = lexer.stream.makeSubStream(lexer.stream.pos + 1, size);
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lexer.stream.skip(size + 1);
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case "]":
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case "}":
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var currentArray = operandStack.peek();
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for (var i = 1; i < operandIsArray; i++)
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currentArray = currentArray[currentArray.length - 1];
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dump("End" + (command == "}" ? " Executable " : " ") + "Array: " + currentArray.join(" "));
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operandIsArray--;
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break;
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var charString = decrypt(stream, kCharStringsEncryptionKey, 4).join("");
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var charStream = new StringStream(charString);
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case "if":
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var procedure = operandStack.pop();
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var bool = operandStack.pop();
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if (!IsBool(bool)) {
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dump("if: " + bool);
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// we need to execute things, let be dirty
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executionStack.push(bool);
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} else {
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dump("if ( " + bool + " ) { " + procedure + " }");
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if (bool)
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executionStack.push(procedure);
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}
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break;
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// XXX do we want to store that on the top dictionary or somewhere else
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dictionaryStack.peek().set(key, charStream);
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case "ifelse":
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var procedure1 = operandStack.pop();
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var procedure2 = operandStack.pop();
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var bool = !!operandStack.pop();
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dump("if ( " + bool + " ) { " + procedure2 + " } else { " + procedure1 + " }");
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executionStack.push(bool ? procedure2 : procedure1);
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break;
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var decodedCharString = decodeCharString(charStream);
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dump(decodedCharString);
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case "dup":
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//log("duplicate: " + operandStack.peek());
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operandStack.push(operandStack.peek());
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break;
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this.getObj();
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} else if (IsCmd(obj, "LenIV")) {
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error("LenIV: argh! we need to modify the length of discard characters for charStrings");
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} else if (IsCmd(obj, "closefile")) {
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// End of binary data;
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} else if (IsCmd(obj, "index")) {
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var operands = [];
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var size = operandStack.pop();
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for (var i = 0; i < size; i++)
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operands.push(operandStack.pop());
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case "mark":
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operandStack.push("mark");
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break;
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var newOperand = operandStack.peek();
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case "cleartomark":
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var command = "";
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do {
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command = operandStack.pop();
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} while (command != "mark");
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break;
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for (var i = 0; i < operands.length; i++)
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operandStack.push(operands.pop());
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case "put":
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var data = operandStack.pop();
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var indexOrKey = operandStack.pop();
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var object = operandStack.pop();
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//dump("put " + data + " in " + object + "[" + indexOrKey + "]");
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object.set ? object.set(indexOrKey, data)
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: object[indexOrKey] = data;
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operandStack.push(newOperand);
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this.getObj();
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} else if (IsCmd(obj, "StandardEncoding")) {
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// For some reason the value is considered as a command, maybe it is
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// because of the uppercae 'S'
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operandStack.push(obj.cmd);
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this.getObj();
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} else {
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var command = null;
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if (IsCmd(obj)) {
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for (var i = 0; i < dictionaryStack.length; i++) {
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command = dictionaryStack.get(i).get(obj.cmd);
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if (command)
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break;
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}
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break;
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case "pop":
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operandStack.pop();
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break;
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case "exch":
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var operand1 = operandStack.pop();
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var operand2 = operandStack.pop();
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operandStack.push(operand1);
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operandStack.push(operand2);
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break;
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case "get":
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var indexOrKey = operandStack.pop();
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var object = operandStack.pop();
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log("==============");
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operandStack.toString();
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log(dictionaryStack.__innerStack__);
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log(object + "::" + indexOrKey);
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var data = object.get ? object.get(indexOrKey) : object[indexOrKey];
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dump("get " + obj + "[" + indexOrKey + "]: " + data);
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operandStack.push(data);
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break;
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case "currentdict":
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var dict = dictionaryStack.peek();
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operandStack.push(dict);
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break;
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case "systemdict":
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operandStack.push(systemDict);
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break;
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case "readonly":
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case "executeonly":
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case "noaccess":
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// Do nothing for the moment
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break;
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case "currentfile":
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operandStack.push("currentfile");
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break;
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case "array":
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var size = operandStack.pop();
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var array = new Array(size);
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operandStack.push(array);
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break;
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case "dict":
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var size = operandStack.pop();
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var dict = new Dict(size);
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operandStack.push(dict);
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break;
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case "begin":
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dictionaryStack.push(operandStack.pop());
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break;
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case "end":
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dictionaryStack.pop();
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break;
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case "def":
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var value = operandStack.pop();
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var key = operandStack.pop();
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dump("def: " + key + " = " + value);
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dictionaryStack.peek().set(key, value);
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break;
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case "definefont":
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var font = operandStack.pop();
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var key = operandStack.pop();
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dump("definefont " + font + " with key: " + key);
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Font.set(key, font);
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break;
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case "known":
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var name = operandStack.pop();
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var dict = operandStack.pop();
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var data = !!dict.get(name);
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dump("known: " + data + " :: " + name + " in dict: " + dict);
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operandStack.push(data);
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break;
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case "exec":
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executionStack.push(operandStack.pop());
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break;
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case "eexec":
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// All the first segment data has been read, decrypt the second segment
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// and start interpreting it in order to decode it
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var eexecString = decrypt(aBinaryStream, kEexecEncryptionKey, 4).join("");
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lexer = new Lexer(new StringStream(eexecString));
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break;
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case "LenIV":
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error("LenIV: argh! we need to modify the length of discard characters for charStrings");
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break;
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case "closefile":
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var file = operandStack.pop();
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return;
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break;
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case "index":
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var operands = [];
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var size = operandStack.pop();
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for (var i = 0; i < size; i++)
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operands.push(operandStack.pop());
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var newOperand = operandStack.peek();
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for (var i = 0; i < operands.length; i++)
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operandStack.push(operands.pop());
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operandStack.push(newOperand);
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break;
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case "string":
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var size = operandStack.pop();
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var str = (new Array(size + 1)).join(" ");
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operandStack.push(str);
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break;
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case "readstring":
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var str = operandStack.pop();
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var size = str.length;
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var file = operandStack.pop();
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// Add '1' because of the space separator, this is dirty
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var stream = lexer.stream.makeSubStream(lexer.stream.pos + 1, size);
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lexer.stream.skip(size + 1);
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var charString = decrypt(stream, kCharStringsEncryptionKey, 4).join("");
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var charStream = new StringStream(charString);
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var decodedCharString = decodeCharString(charStream);
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dump("decodedCharString: " + decodedCharString);
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operandStack.push(decodedCharString);
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// boolean indicating if the operation is a success or not
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operandStack.push(true);
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break;
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case "StandardEncoding":
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// For some reason the value is considered as a command, maybe it is
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// because of the uppercase 'S'
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operandStack.push(obj.cmd);
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break;
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default:
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var command = null;
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if (IsCmd(obj)) {
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for (var i = 0; i < dictionaryStack.length; i++) {
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if (command = dictionaryStack.get(i).get(obj.cmd)) {
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dump("found in dictionnary for " + obj.cmd + " command: " + command);
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executionStack.push(command.slice());
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break;
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}
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}
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}
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if (!command) {
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log("operandStack: " + operandStack);
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log("dictionaryStack: " + dictionaryStack);
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log(obj);
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error("Unknow command while parsing font");
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}
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break;
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}
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if (command) {
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// XXX add the command to the execution stack
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this.getObj();
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} else {
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log("operandStack: " + operandStack);
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log("dictionaryStack: " + dictionaryStack);
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dump(obj);
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error("Unknow token while parsing font");
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}
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return parseNext();
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} else if (obj){
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log (obj);
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operandStack.push(obj);
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return parseNext();
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}
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return operandStack.peek();
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}
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};
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|
||||
@ -467,8 +569,7 @@ var Type1Font = function(aFontName, aFontFile) {
|
||||
|
||||
this.parser = new Type1Parser(ASCIIStream, binaryStream);
|
||||
|
||||
var fontDictionary = this.parser.getObj();
|
||||
log(fontDictionary + "\t" + "fontInfo: " + fontDictionary.get("FontInfo"));
|
||||
this.parser.getObj();
|
||||
hack = true;
|
||||
}
|
||||
|
||||
|
||||
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Reference in New Issue
Block a user