/var/www/greso.tech/server/nsm/node_modules/pdf-lib/cjs/core/streams
Edit: /var/www/greso.tech/server/nsm/node_modules/pdf-lib/cjs/core/streams/DecodeStream.js (5062B)
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var tslib_1 = require("tslib");
var errors_1 = require("../errors");
var Stream_1 = tslib_1.__importDefault(require("./Stream"));
/*
* Copyright 2012 Mozilla Foundation
*
* The DecodeStream class contained in this file is a TypeScript port of the
* JavaScript DecodeStream class in Mozilla's pdf.js project, made available
* under the Apache 2.0 open source license.
*/
// Lots of DecodeStreams are created whose buffers are never used. For these
// we share a single empty buffer. This is (a) space-efficient and (b) avoids
// having special cases that would be required if we used |null| for an empty
// buffer.
var emptyBuffer = new Uint8Array(0);
/**
* Super class for the decoding streams
*/
var DecodeStream = /** @class */ (function () {
function DecodeStream(maybeMinBufferLength) {
this.pos = 0;
this.bufferLength = 0;
this.eof = false;
this.buffer = emptyBuffer;
this.minBufferLength = 512;
if (maybeMinBufferLength) {
// Compute the first power of two that is as big as maybeMinBufferLength.
while (this.minBufferLength < maybeMinBufferLength) {
this.minBufferLength *= 2;
}
}
}
Object.defineProperty(DecodeStream.prototype, "isEmpty", {
get: function () {
while (!this.eof && this.bufferLength === 0) {
this.readBlock();
}
return this.bufferLength === 0;
},
enumerable: false,
configurable: true
});
DecodeStream.prototype.getByte = function () {
var pos = this.pos;
while (this.bufferLength <= pos) {
if (this.eof) {
return -1;
}
this.readBlock();
}
return this.buffer[this.pos++];
};
DecodeStream.prototype.getUint16 = function () {
var b0 = this.getByte();
var b1 = this.getByte();
if (b0 === -1 || b1 === -1) {
return -1;
}
return (b0 << 8) + b1;
};
DecodeStream.prototype.getInt32 = function () {
var b0 = this.getByte();
var b1 = this.getByte();
var b2 = this.getByte();
var b3 = this.getByte();
return (b0 << 24) + (b1 << 16) + (b2 << 8) + b3;
};
DecodeStream.prototype.getBytes = function (length, forceClamped) {
if (forceClamped === void 0) { forceClamped = false; }
var end;
var pos = this.pos;
if (length) {
this.ensureBuffer(pos + length);
end = pos + length;
while (!this.eof && this.bufferLength < end) {
this.readBlock();
}
var bufEnd = this.bufferLength;
if (end > bufEnd) {
end = bufEnd;
}
}
else {
while (!this.eof) {
this.readBlock();
}
end = this.bufferLength;
}
this.pos = end;
var subarray = this.buffer.subarray(pos, end);
// `this.buffer` is either a `Uint8Array` or `Uint8ClampedArray` here.
return forceClamped && !(subarray instanceof Uint8ClampedArray)
? new Uint8ClampedArray(subarray)
: subarray;
};
DecodeStream.prototype.peekByte = function () {
var peekedByte = this.getByte();
this.pos--;
return peekedByte;
};
DecodeStream.prototype.peekBytes = function (length, forceClamped) {
if (forceClamped === void 0) { forceClamped = false; }
var bytes = this.getBytes(length, forceClamped);
this.pos -= bytes.length;
return bytes;
};
DecodeStream.prototype.skip = function (n) {
if (!n) {
n = 1;
}
this.pos += n;
};
DecodeStream.prototype.reset = function () {
this.pos = 0;
};
DecodeStream.prototype.makeSubStream = function (start, length /* dict */) {
var end = start + length;
while (this.bufferLength <= end && !this.eof) {
this.readBlock();
}
return new Stream_1.default(this.buffer, start, length /* dict */);
};
DecodeStream.prototype.decode = function () {
while (!this.eof)
this.readBlock();
return this.buffer.subarray(0, this.bufferLength);
};
DecodeStream.prototype.readBlock = function () {
throw new errors_1.MethodNotImplementedError(this.constructor.name, 'readBlock');
};
DecodeStream.prototype.ensureBuffer = function (requested) {
var buffer = this.buffer;
if (requested <= buffer.byteLength) {
return buffer;
}
var size = this.minBufferLength;
while (size < requested) {
size *= 2;
}
var buffer2 = new Uint8Array(size);
buffer2.set(buffer);
return (this.buffer = buffer2);
};
return DecodeStream;
}());
exports.default = DecodeStream;
//# sourceMappingURL=DecodeStream.js.map