Cleaning up FaxStream
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sbarman
parent
8c3ebb8d9f
commit
325170a5fc
199
pdf.js
199
pdf.js
@ -839,7 +839,7 @@ var Ascii85Stream = (function() {
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return constructor;
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})();
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var CcittFaxStream = (function() {
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var CCITTFaxStream = (function() {
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const ccittEOL = -2;
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const twoDimPass = 0;
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@ -1284,12 +1284,15 @@ var CcittFaxStream = (function() {
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this.codingLine = new Uint8Array(this.columns + 1);
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this.codingLine[0] = this.columns;
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this.a0i = 0;
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this.refLine = new Uint8Array(this.columns + 2);
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this.row = 0;
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this.nextLine2D = this.encoding < 0;
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this.inputBits = 0;
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this.a0i = 0;
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this.inputBuf;
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this.outputBits = 0;
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this.buf = EOF;
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var code1;
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while ((code1 = this.lookBits(12)) == 0) {
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@ -1310,57 +1313,81 @@ var CcittFaxStream = (function() {
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constructor.prototype.readBlock = function() {
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};
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constructor.prototype.addPixels(a1, blackPixels) {
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if (a1 > this.codingLine[this.a01]) {
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var codingLine = this.codingLine;
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var a0i = this.a0i;
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if (a1 > codingLine[a0i]) {
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if (a1 > this.columns)
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error("row is wrong length");
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if (this.a0i & 1) ^ this.blackPixels)
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this.a0i++;
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if (a0i & 1) ^ blackPixels) {
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++a0i;
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this.a0i = a0i;
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}
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this.codingLine[this.a0i] = a1;
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};
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constructor.prototype.addPixelsNeg(a1, blackPixels) {
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if (a1 > this.codingLine[this.a01]) {
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if (a1 > this.columns)
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error("row is wrong length");
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if (this.a0i & 1) ^ this.blackPixels)
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this.a0i++;
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this.codingLine[this.a0i] = a1;
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} else if (at < this.codingLine[this.a0i]) {
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if (a1 < 0)
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error("invalid code");
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while (this.a0i > 0 && a1 < this.codingLine[this.a0i -i])
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this.a0i--;
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this.codingLine[this.a0i] = a1;
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codingLine[a0i] = a1;
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}
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};
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constructor.prototype.lookChar(a1, blackPixels) {
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constructor.prototype.addPixelsNeg(a1, blackPixels) {
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var codingLine = this.codingLine;
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var a0i = this.a0i;
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if (a1 > codingLine[a0i]) {
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if (a1 > this.columns)
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error("row is wrong length");
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if (a0i & 1) ^ blackPixels)
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++a0i;
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codingLine[a0i] = a1;
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} else if (a1 < codingLine[a0i]) {
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if (a1 < 0)
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error("invalid code");
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while (a0i > 0 && a1 < codingLine[a0i - 1])
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--a0i;
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this.codingLine[a0i] = a1;
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}
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this.a0i = a0i;
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};
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constructor.prototype.lookChar() {
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var refLine = this.refLine;
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var codingLine = this.codingLine;
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var columns = this.columns;
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if (this.outputBits == 0) {
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var outputBits = this.outputBits;
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var a0i = this.a0i;
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var b1i, blackPixels, bits;
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if (this.buf != EOF)
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return buf;
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if (outputBits == 0) {
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if (this.eof)
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return;
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if (this.nextLine2D) {
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for (var i = 0; codingLine[i] < columns; ++i)
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refLine[i] = codeLine[i];
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refLine[i] = codingLine[i];
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refLine[i++] = columns;
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refLine[i] = columns;
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codingLine[0] = 0;
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this.a0i = 0;
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this.bl1 = 0;
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this.blackPixels = 0;
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a0i = 0;
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bl1 = 0;
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blackPixels = 0;
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while (codingLine[this.a0i] < columns) {
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while (codingLine[a0i] < columns) {
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var code1 = this.getTwoDumCode();
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switch (code1) {
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case twoDimPass:
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this.addPixels(refLine[this.bli + 1], this.blackPixels);
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if (refLine[this.bli + 1] < columns)
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this.bli += 2;
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this.addPixels(refLine[b1i + 1], blackPixels);
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a0i = this.a0i;
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if (refLine[bli + 1] < columns)
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bli += 2;
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break;
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case twoDimHoriz:
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var code1 = 0, code2 = 0;
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if (this.blackPixels) {
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if (blackPixels) {
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var code3;
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do {
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code1 += (code3 = this.getBlackCode());
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@ -1371,75 +1398,99 @@ var CcittFaxStream = (function() {
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else {
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var code3;
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do {
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code1 += (code3 = getWhiteCode());
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code1 += (code3 = this.getWhiteCode());
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} while (code3 >= 64);
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this.addPixels(codeLine[this.a0i + code1, this.blackPixels);
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if (codeLine[a0i] < columns) {
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addPixels(codeLine[a0i] + code2, this.blackPixels ^ 1);
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}
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while (refLine[this.bli] <= codingLine[a0i]
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&& refLine[this.bli] < columns) {
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this.bli += 2;
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}
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do {
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code2 += (code3 = this.getBlackCode());
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} while (code3 >= 64);
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}
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this.addPixels(codingLine[a0i] + code1, blackPixels);
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a0i = this.a0i;
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if (codingLine[a0i] < columns) {
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this.addPixels(codeLine[a0i] + code2,
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blackPixels ^ 1);
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a0i = this.a0i;
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}
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while (refLine[b1i] <= codingLine[a0i]
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&& refLine[bli] < columns) {
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bli += 2;
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}
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break;
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case twoDimVertR3:
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this.addPixels(refLine[b1i] + 3, blackPixels);
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a0i = this.a0i;
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blackPixels ^= 1;
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if (codingLine[a0i] < columns) {
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++b1i;
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while (refLine[b1i] <= codingLine[a0i] &&
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refLine[b1i] < columns)
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b1i += 2;
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}
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break;
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case twoDimVertR2:
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this.addPixels(this.refLine[this.bli], blackPixels);
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this.addPixels(refLine[b1i] + 2, blackPixels);
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a0i = this.a0i;
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blackPixels ^= 1;
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if (codeLine[this.a01] < columns) {
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this.bli++;
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while (refLine[this.bli] <= codeLine[this.a0i] &&
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if (codingLine[a01] < columns) {
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++bli;
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while (refLine[bli] <= codingLine[a0i] &&
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refLine[bli] < columns) {
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this.bli += 2;
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bli += 2;
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}
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}
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break;
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case twoDimVertR1:
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this.addPixels(refLine[this.bli] + 1, blackPixels);
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this.blackPixels ^= 1;
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if (codeLine[this.a01] < columns) {
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this.bli++;
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while (refLine[this.bli] < codingLine[this.a0i] &&
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refLine[this.bli] < columns)
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this.addPixels(refLine[bli] + 1, blackPixels);
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a0i = this.a0i;
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blackPixels ^= 1;
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if (codingLine[a01] < columns) {
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++bli;
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while (refLine[bli] < codingLine[a0i] &&
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refLine[bli] < columns)
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this.bli += 2;
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}
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break;
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case twoDimVert0:
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this.addPixels(refLine[this.bli], blackPixels);
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this.blackPixels ^= 1;
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if (codingLine[this.a0i] < columns) {
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this.bli++;
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while (refLine[this.bli] <= codingLine[a0i] &&
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refLine[this.bli] < columns)
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this.bli += 2;
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}
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break;
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case twoDimVertL3:
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this.addPixelsNeg(refLine[this.bli] - 3, blackPixels);
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this.blackPixels ^= 1;
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if (codeLine[a0i] < columns) {
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if (bli > 0)
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--bli;
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else
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++bli;
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this.addPixels(refLine[bli], blackPixels);
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a0i = this.a0i;
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blackPixels ^= 1;
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if (codingLine[a0i] < columns) {
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++bli;
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while (refLine[bli] <= codingLine[a0i] &&
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refLine[bli] < columns)
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bli += 2;
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}
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break;
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case twoDimVertL2:
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this.addPixelsNeg(refLine[bli] - 2, blackPixels);
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case twoDimVertL3:
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this.addPixelsNeg(refLine[bli] - 3, blackPixels);
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a0i = this.a0i;
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blackPixels ^= 1;
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if (codingLine[a0i] < columns) {
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if (codeLine[a0i] < columns) {
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if (bli > 0)
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--bli;
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else
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++bli;
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while (refLine[bli] <= codingLine[a0i] &&
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refLine[bl1] < columns)
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while (refLine[b1i] <= codingLine[a0i] &&
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refLine[b1i] < columns)
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bli += 2;
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}
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break;
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case twoDimVertL2:
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this.addPixelsNeg(refLine[b1i] - 2, blackPixels);
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a0i = this.a0i;
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blackPixels ^= 1;
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if (codingLine[a0i] < columns) {
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if (b1i > 0)
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--b1i;
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else
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++bli;
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while (refLine[b1i] <= codingLine[a0i] &&
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refLine[b11] < columns)
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b1i += 2;
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}
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break;
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///////// STOPPED HERE
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case twoDimVertL1:
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this.addPixelsNeg(refLine[bli] - 1, blackPixels);
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this.blackPixels ^= 1;
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