@syncfusion/ej2-pdf
Version:
Feature-rich JavaScript PDF library with built-in support for loading and manipulating PDF document.
330 lines (329 loc) • 15.3 kB
JavaScript
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
import { _PdfDecodeStream } from './decode-stream';
import { FormatError } from './utils';
var codeLenCodeMap = new Int32Array([
16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
]);
var lengthDecode = new Int32Array([
0x00003, 0x00004, 0x00005, 0x00006, 0x00007, 0x00008, 0x00009, 0x0000a,
0x1000b, 0x1000d, 0x1000f, 0x10011, 0x20013, 0x20017, 0x2001b, 0x2001f,
0x30023, 0x3002b, 0x30033, 0x3003b, 0x40043, 0x40053, 0x40063, 0x40073,
0x50083, 0x500a3, 0x500c3, 0x500e3, 0x00102, 0x00102, 0x00102
]);
var distDecode = new Int32Array([
0x00001, 0x00002, 0x00003, 0x00004, 0x10005, 0x10007, 0x20009, 0x2000d,
0x30011, 0x30019, 0x40021, 0x40031, 0x50041, 0x50061, 0x60081, 0x600c1,
0x70101, 0x70181, 0x80201, 0x80301, 0x90401, 0x90601, 0xa0801, 0xa0c01,
0xb1001, 0xb1801, 0xc2001, 0xc3001, 0xd4001, 0xd6001
]);
var fixedLitCodeTab = [
new Int32Array([
0x70100, 0x80050, 0x80010, 0x80118, 0x70110, 0x80070, 0x80030, 0x900c0,
0x70108, 0x80060, 0x80020, 0x900a0, 0x80000, 0x80080, 0x80040, 0x900e0,
0x70104, 0x80058, 0x80018, 0x90090, 0x70114, 0x80078, 0x80038, 0x900d0,
0x7010c, 0x80068, 0x80028, 0x900b0, 0x80008, 0x80088, 0x80048, 0x900f0,
0x70102, 0x80054, 0x80014, 0x8011c, 0x70112, 0x80074, 0x80034, 0x900c8,
0x7010a, 0x80064, 0x80024, 0x900a8, 0x80004, 0x80084, 0x80044, 0x900e8,
0x70106, 0x8005c, 0x8001c, 0x90098, 0x70116, 0x8007c, 0x8003c, 0x900d8,
0x7010e, 0x8006c, 0x8002c, 0x900b8, 0x8000c, 0x8008c, 0x8004c, 0x900f8,
0x70101, 0x80052, 0x80012, 0x8011a, 0x70111, 0x80072, 0x80032, 0x900c4,
0x70109, 0x80062, 0x80022, 0x900a4, 0x80002, 0x80082, 0x80042, 0x900e4,
0x70105, 0x8005a, 0x8001a, 0x90094, 0x70115, 0x8007a, 0x8003a, 0x900d4,
0x7010d, 0x8006a, 0x8002a, 0x900b4, 0x8000a, 0x8008a, 0x8004a, 0x900f4,
0x70103, 0x80056, 0x80016, 0x8011e, 0x70113, 0x80076, 0x80036, 0x900cc,
0x7010b, 0x80066, 0x80026, 0x900ac, 0x80006, 0x80086, 0x80046, 0x900ec,
0x70107, 0x8005e, 0x8001e, 0x9009c, 0x70117, 0x8007e, 0x8003e, 0x900dc,
0x7010f, 0x8006e, 0x8002e, 0x900bc, 0x8000e, 0x8008e, 0x8004e, 0x900fc,
0x70100, 0x80051, 0x80011, 0x80119, 0x70110, 0x80071, 0x80031, 0x900c2,
0x70108, 0x80061, 0x80021, 0x900a2, 0x80001, 0x80081, 0x80041, 0x900e2,
0x70104, 0x80059, 0x80019, 0x90092, 0x70114, 0x80079, 0x80039, 0x900d2,
0x7010c, 0x80069, 0x80029, 0x900b2, 0x80009, 0x80089, 0x80049, 0x900f2,
0x70102, 0x80055, 0x80015, 0x8011d, 0x70112, 0x80075, 0x80035, 0x900ca,
0x7010a, 0x80065, 0x80025, 0x900aa, 0x80005, 0x80085, 0x80045, 0x900ea,
0x70106, 0x8005d, 0x8001d, 0x9009a, 0x70116, 0x8007d, 0x8003d, 0x900da,
0x7010e, 0x8006d, 0x8002d, 0x900ba, 0x8000d, 0x8008d, 0x8004d, 0x900fa,
0x70101, 0x80053, 0x80013, 0x8011b, 0x70111, 0x80073, 0x80033, 0x900c6,
0x70109, 0x80063, 0x80023, 0x900a6, 0x80003, 0x80083, 0x80043, 0x900e6,
0x70105, 0x8005b, 0x8001b, 0x90096, 0x70115, 0x8007b, 0x8003b, 0x900d6,
0x7010d, 0x8006b, 0x8002b, 0x900b6, 0x8000b, 0x8008b, 0x8004b, 0x900f6,
0x70103, 0x80057, 0x80017, 0x8011f, 0x70113, 0x80077, 0x80037, 0x900ce,
0x7010b, 0x80067, 0x80027, 0x900ae, 0x80007, 0x80087, 0x80047, 0x900ee,
0x70107, 0x8005f, 0x8001f, 0x9009e, 0x70117, 0x8007f, 0x8003f, 0x900de,
0x7010f, 0x8006f, 0x8002f, 0x900be, 0x8000f, 0x8008f, 0x8004f, 0x900fe,
0x70100, 0x80050, 0x80010, 0x80118, 0x70110, 0x80070, 0x80030, 0x900c1,
0x70108, 0x80060, 0x80020, 0x900a1, 0x80000, 0x80080, 0x80040, 0x900e1,
0x70104, 0x80058, 0x80018, 0x90091, 0x70114, 0x80078, 0x80038, 0x900d1,
0x7010c, 0x80068, 0x80028, 0x900b1, 0x80008, 0x80088, 0x80048, 0x900f1,
0x70102, 0x80054, 0x80014, 0x8011c, 0x70112, 0x80074, 0x80034, 0x900c9,
0x7010a, 0x80064, 0x80024, 0x900a9, 0x80004, 0x80084, 0x80044, 0x900e9,
0x70106, 0x8005c, 0x8001c, 0x90099, 0x70116, 0x8007c, 0x8003c, 0x900d9,
0x7010e, 0x8006c, 0x8002c, 0x900b9, 0x8000c, 0x8008c, 0x8004c, 0x900f9,
0x70101, 0x80052, 0x80012, 0x8011a, 0x70111, 0x80072, 0x80032, 0x900c5,
0x70109, 0x80062, 0x80022, 0x900a5, 0x80002, 0x80082, 0x80042, 0x900e5,
0x70105, 0x8005a, 0x8001a, 0x90095, 0x70115, 0x8007a, 0x8003a, 0x900d5,
0x7010d, 0x8006a, 0x8002a, 0x900b5, 0x8000a, 0x8008a, 0x8004a, 0x900f5,
0x70103, 0x80056, 0x80016, 0x8011e, 0x70113, 0x80076, 0x80036, 0x900cd,
0x7010b, 0x80066, 0x80026, 0x900ad, 0x80006, 0x80086, 0x80046, 0x900ed,
0x70107, 0x8005e, 0x8001e, 0x9009d, 0x70117, 0x8007e, 0x8003e, 0x900dd,
0x7010f, 0x8006e, 0x8002e, 0x900bd, 0x8000e, 0x8008e, 0x8004e, 0x900fd,
0x70100, 0x80051, 0x80011, 0x80119, 0x70110, 0x80071, 0x80031, 0x900c3,
0x70108, 0x80061, 0x80021, 0x900a3, 0x80001, 0x80081, 0x80041, 0x900e3,
0x70104, 0x80059, 0x80019, 0x90093, 0x70114, 0x80079, 0x80039, 0x900d3,
0x7010c, 0x80069, 0x80029, 0x900b3, 0x80009, 0x80089, 0x80049, 0x900f3,
0x70102, 0x80055, 0x80015, 0x8011d, 0x70112, 0x80075, 0x80035, 0x900cb,
0x7010a, 0x80065, 0x80025, 0x900ab, 0x80005, 0x80085, 0x80045, 0x900eb,
0x70106, 0x8005d, 0x8001d, 0x9009b, 0x70116, 0x8007d, 0x8003d, 0x900db,
0x7010e, 0x8006d, 0x8002d, 0x900bb, 0x8000d, 0x8008d, 0x8004d, 0x900fb,
0x70101, 0x80053, 0x80013, 0x8011b, 0x70111, 0x80073, 0x80033, 0x900c7,
0x70109, 0x80063, 0x80023, 0x900a7, 0x80003, 0x80083, 0x80043, 0x900e7,
0x70105, 0x8005b, 0x8001b, 0x90097, 0x70115, 0x8007b, 0x8003b, 0x900d7,
0x7010d, 0x8006b, 0x8002b, 0x900b7, 0x8000b, 0x8008b, 0x8004b, 0x900f7,
0x70103, 0x80057, 0x80017, 0x8011f, 0x70113, 0x80077, 0x80037, 0x900cf,
0x7010b, 0x80067, 0x80027, 0x900af, 0x80007, 0x80087, 0x80047, 0x900ef,
0x70107, 0x8005f, 0x8001f, 0x9009f, 0x70117, 0x8007f, 0x8003f, 0x900df,
0x7010f, 0x8006f, 0x8002f, 0x900bf, 0x8000f, 0x8008f, 0x8004f, 0x900ff
]),
9
];
var fixedDistCodeTab = [
new Int32Array([
0x50000, 0x50010, 0x50008, 0x50018, 0x50004, 0x50014, 0x5000c, 0x5001c,
0x50002, 0x50012, 0x5000a, 0x5001a, 0x50006, 0x50016, 0x5000e, 0x00000,
0x50001, 0x50011, 0x50009, 0x50019, 0x50005, 0x50015, 0x5000d, 0x5001d,
0x50003, 0x50013, 0x5000b, 0x5001b, 0x50007, 0x50017, 0x5000f, 0x00000
]),
5
];
var _PdfFlateStream = /** @class */ (function (_super) {
__extends(_PdfFlateStream, _super);
function _PdfFlateStream(stream, maybeLength) {
var _this = _super.call(this, maybeLength) || this;
_this.stream = stream;
_this.dictionary = stream.dictionary;
var cmf = stream.getByte();
var flg = stream.getByte();
if ((cmf & 0x0f) !== 0x08) {
throw new FormatError("Unknown compression method in flate stream: " + cmf + ", " + flg);
}
if (((cmf << 8) + flg) % 31 !== 0) {
throw new FormatError("Bad flag check in flate stream: " + cmf + ", " + flg);
}
if (flg & 0x20) {
throw new FormatError("Bad flag bit set in flate stream: " + cmf + ", " + flg);
}
_this.codeSize = 0;
_this.codeBuffer = 0;
return _this;
}
_PdfFlateStream.prototype.getBits = function (bits) {
var stream = this.stream;
var codeSize = this.codeSize;
var codeBuffer = this.codeBuffer;
var b;
while (codeSize < bits) {
b = stream.getByte();
codeBuffer |= b << codeSize;
codeSize += 8;
}
b = codeBuffer & ((1 << bits) - 1);
this.codeBuffer = codeBuffer >> bits;
this.codeSize = codeSize -= bits;
return b;
};
_PdfFlateStream.prototype.getCode = function (table) {
var stream = this.stream;
var codes = table[0];
var maxLen = table[1];
var codeSize = this.codeSize;
var codeBuffer = this.codeBuffer;
var b;
while (codeSize < maxLen) {
b = stream.getByte();
codeBuffer |= b << codeSize;
codeSize += 8;
}
var code = codes[codeBuffer & ((1 << maxLen) - 1)];
var codeLen = code >> 16;
var codeVal = code & 0xffff;
if (!(codeLen < 1 || codeSize < codeLen)) {
this.codeBuffer = codeBuffer >> codeLen;
this.codeSize = codeSize - codeLen;
}
return codeVal;
};
_PdfFlateStream.prototype.generateHuffmanTable = function (lengths) {
var n = lengths.length;
var maximumLength = 0;
var i;
for (i = 0; i < n; ++i) {
if (lengths[i] > maximumLength) { // eslint-disable-line
maximumLength = lengths[i]; // eslint-disable-line
}
}
var size = 1 << maximumLength;
var codes = new Int32Array(size);
for (var len = 1, code = 0, skip = 2; len <= maximumLength; ++len, code <<= 1, skip <<= 1) {
for (var val = 0; val < n; ++val) {
if (lengths[val] === len) { // eslint-disable-line
var code2 = 0;
var t = code;
for (i = 0; i < len; ++i) {
code2 = (code2 << 1) | (t & 1);
t >>= 1;
}
for (i = code2; i < size; i += skip) {
codes[i] = (len << 16) | val; // eslint-disable-line
}
++code;
}
}
}
return [codes, maximumLength];
};
_PdfFlateStream.prototype.readBlock = function () {
var buffer;
var length;
var stream = this.stream;
var hdr = this.getBits(3);
if (hdr & 1) {
this.eof = true;
}
hdr >>= 1;
if (hdr === 0) {
var b = stream.getByte();
var blockLen = b;
b = stream.getByte();
blockLen |= b << 8;
b = stream.getByte();
var check = b;
b = stream.getByte();
check |= b << 8;
if (!(check !== (~blockLen & 0xffff) && (blockLen !== 0 || check !== 0))) {
this.codeBuffer = 0;
this.codeSize = 0;
var bufferLength = this.bufferLength;
var end = bufferLength + blockLen;
buffer = this.ensureBuffer(end);
this.bufferLength = end;
if (blockLen === 0) {
if (stream.peekByte() === -1) {
this.eof = true;
}
}
else {
var block = stream.getBytes(blockLen);
buffer.set(block, bufferLength);
if (block.length < blockLen) {
this.eof = true;
}
}
return;
}
}
var litCodeTable;
var distCodeTable;
if (hdr === 1) {
litCodeTable = fixedLitCodeTab;
distCodeTable = fixedDistCodeTab;
}
else if (hdr === 2) {
var numLitCodes = this.getBits(5) + 257;
var numDistCodes = this.getBits(5) + 1;
var numCodeLenCodes = this.getBits(4) + 4;
var codeLenCodeLengths = new Uint8Array(codeLenCodeMap.length);
var i = void 0;
for (i = 0; i < numCodeLenCodes; ++i) {
codeLenCodeLengths[codeLenCodeMap[i]] = this.getBits(3); // eslint-disable-line
}
var codeLenCodeTab = this.generateHuffmanTable(codeLenCodeLengths);
length = 0;
i = 0;
var codes = numLitCodes + numDistCodes;
var codeLengths = new Uint8Array(codes);
var bitsLength = void 0;
var bitsOffset = void 0;
var what = void 0;
while (i < codes) {
var code = this.getCode(codeLenCodeTab);
if (code === 16) {
bitsLength = 2;
bitsOffset = 3;
what = length;
}
else if (code === 17) {
bitsLength = 3;
bitsOffset = 3;
what = length = 0;
}
else if (code === 18) {
bitsLength = 7;
bitsOffset = 11;
what = length = 0;
}
else {
codeLengths[i++] = length = code;
continue;
}
var repeatLength = this.getBits(bitsLength) + bitsOffset;
while (repeatLength-- > 0) {
codeLengths[i++] = what;
}
}
litCodeTable = this.generateHuffmanTable(codeLengths.subarray(0, numLitCodes));
distCodeTable = this.generateHuffmanTable(codeLengths.subarray(numLitCodes, codes));
}
buffer = this.buffer;
var limit = buffer ? buffer.length : 0;
var position = this.bufferLength;
while (true) { // eslint-disable-line
var code1 = this.getCode(litCodeTable);
if (code1 < 256) {
if (position + 1 >= limit) {
buffer = this.ensureBuffer(position + 1);
limit = buffer.length;
}
buffer[position++] = code1;
continue;
}
if (code1 === 256) {
this.bufferLength = position;
return;
}
code1 -= 257;
code1 = lengthDecode[code1]; // eslint-disable-line
var code2 = code1 >> 16;
if (code2 > 0) {
code2 = this.getBits(code2);
}
length = (code1 & 0xffff) + code2;
code1 = this.getCode(distCodeTable);
code1 = distDecode[code1]; // eslint-disable-line
code2 = code1 >> 16;
if (code2 > 0) {
code2 = this.getBits(code2);
}
var dist = (code1 & 0xffff) + code2;
if (position + length >= limit) {
buffer = this.ensureBuffer(position + length);
limit = buffer.length;
}
for (var k = 0; k < length; ++k, ++position) {
buffer[position] = buffer[position - dist]; // eslint-disable-line
}
}
};
return _PdfFlateStream;
}(_PdfDecodeStream));
export { _PdfFlateStream };