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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| import DataReader from './DataReader.js'; | ||
| import ArmariusError from '../Error/ArmariusError.js'; | ||
| import BigIntUtils from '../Util/BigIntUtils.js'; | ||
|
|
||
| /** | ||
| * @abstract | ||
| */ | ||
| export default class BufferedDataReader extends DataReader { | ||
| /** @type {?Uint8Array} */ buffer; | ||
| /** @type {DataView} */ bufferView; | ||
| /** @type {Number} */ bufferStartOffset; | ||
|
|
||
| /** | ||
| * @inheritDoc | ||
| */ | ||
| async readAt(offset, length, longLived = true) { | ||
| if (this.buffer && offset >= this.bufferStartOffset && length <= this.buffer.byteLength - (offset - this.bufferStartOffset)) { | ||
| return this.readFromBuffer(offset, length, longLived); | ||
| } | ||
|
|
||
| if (length < this.bufferSize) { | ||
| this.setBuffer(offset, await this.readRaw(offset, Math.max(length, Math.min(this.bufferSize, this.byteLength - offset)))); | ||
| return this.readFromBuffer(offset, length, longLived); | ||
| } | ||
|
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| return await this.readRaw(offset, length); | ||
| } | ||
|
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| /** | ||
| * @param {number} offset | ||
| * @param {number} length | ||
| * @protected | ||
| * @abstract | ||
| * @returns {Promise<Uint8Array>} | ||
| */ | ||
| async readRaw(offset, length) { | ||
|
|
||
| } | ||
|
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| /** | ||
| * @param {number} offset | ||
| * @param {number} length | ||
| * @param {boolean} longLived | ||
| * @protected | ||
| * @returns {Uint8Array} | ||
| */ | ||
| readFromBuffer(offset, length, longLived = false) { | ||
| let bufferOffset = offset - this.bufferStartOffset; | ||
| if (bufferOffset < 0 || bufferOffset + length > this.buffer.byteLength) { | ||
| throw new ArmariusError(`Cannot read ${length} bytes of buffer at ${bufferOffset}`); | ||
| } | ||
|
|
||
| if (longLived && this.buffer.byteLength - length > 512) { | ||
| return this.buffer.slice(bufferOffset, bufferOffset + length); | ||
| } | ||
|
|
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| return new Uint8Array(this.buffer.buffer, this.buffer.byteOffset + bufferOffset, length); | ||
| } | ||
|
|
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| /** | ||
| * @param {number} bufferOffset | ||
| * @param {Uint8Array} data | ||
| * @protected | ||
| */ | ||
| setBuffer(bufferOffset, data) { | ||
| this.buffer = data; | ||
| this.bufferView = new DataView(data.buffer, data.byteOffset, data.byteLength); | ||
| this.bufferStartOffset = bufferOffset; | ||
| } | ||
|
|
||
| /** | ||
| * @inheritDoc | ||
| */ | ||
| async getUint8At(offset) { | ||
| if (this.buffer && offset > this.bufferStartOffset && offset - this.bufferStartOffset + 1 < this.buffer.byteLength) { | ||
| return this.bufferView.getUint8(offset - this.bufferStartOffset); | ||
| } | ||
| return super.getUint8At(offset); | ||
| } | ||
|
|
||
| /** | ||
| * @inheritDoc | ||
| */ | ||
| async getUint16At(offset, littleEndian = true) { | ||
| if (this.buffer && offset > this.bufferStartOffset && offset - this.bufferStartOffset + 2 < this.buffer.byteLength) { | ||
| return this.bufferView.getUint16(offset - this.bufferStartOffset, littleEndian); | ||
| } | ||
| return super.getUint16At(offset, littleEndian); | ||
| } | ||
|
|
||
| /** | ||
| * @inheritDoc | ||
| */ | ||
| async getUint32At(offset, littleEndian = true) { | ||
| if (this.buffer && offset > this.bufferStartOffset && offset - this.bufferStartOffset + 4 < this.buffer.byteLength) { | ||
| return this.bufferView.getUint32(offset - this.bufferStartOffset, littleEndian); | ||
| } | ||
| return super.getUint32At(offset, littleEndian); | ||
| } | ||
|
|
||
| /** | ||
| * @inheritDoc | ||
| */ | ||
| async getBigUint64At(offset, littleEndian = true) { | ||
| if (this.buffer && offset > this.bufferStartOffset && offset - this.bufferStartOffset + 8 < this.buffer.byteLength) { | ||
| return BigIntUtils.getBigUint64FromView(this.bufferView, offset - this.bufferStartOffset, littleEndian); | ||
| } | ||
| return super.getBigUint64At(offset, littleEndian); | ||
| } | ||
| } |