igv_component/node_modules/apache-arrow/builder/buffer.js

"use strict";
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
Object.defineProperty(exports, "__esModule", { value: true });
exports.OffsetsBufferBuilder = exports.BitmapBufferBuilder = exports.DataBufferBuilder = exports.BufferBuilder = void 0;
const buffer_js_1 = require("../util/buffer.js");
/** @ignore */
const roundLengthUpToNearest64Bytes = (len, BPE) => ((((Math.ceil(len) * BPE) + 63) & ~63) || 64) / BPE;
/** @ignore */
const sliceOrExtendArray = (arr, len = 0) => (arr.length >= len ? arr.subarray(0, len) : (0, buffer_js_1.memcpy)(new arr.constructor(len), arr, 0));
/** @ignore */
class BufferBuilder {
    constructor(buffer, stride = 1) {
        this.buffer = buffer;
        this.stride = stride;
        this.BYTES_PER_ELEMENT = buffer.BYTES_PER_ELEMENT;
        this.ArrayType = buffer.constructor;
        this._resize(this.length = Math.ceil(buffer.length / stride));
    }
    get byteLength() {
        return Math.ceil(this.length * this.stride) * this.BYTES_PER_ELEMENT;
    }
    get reservedLength() { return this.buffer.length / this.stride; }
    get reservedByteLength() { return this.buffer.byteLength; }
    // @ts-ignore
    set(index, value) { return this; }
    append(value) { return this.set(this.length, value); }
    reserve(extra) {
        if (extra > 0) {
            this.length += extra;
            const stride = this.stride;
            const length = this.length * stride;
            const reserved = this.buffer.length;
            if (length >= reserved) {
                this._resize(reserved === 0
                    ? roundLengthUpToNearest64Bytes(length * 1, this.BYTES_PER_ELEMENT)
                    : roundLengthUpToNearest64Bytes(length * 2, this.BYTES_PER_ELEMENT));
            }
        }
        return this;
    }
    flush(length = this.length) {
        length = roundLengthUpToNearest64Bytes(length * this.stride, this.BYTES_PER_ELEMENT);
        const array = sliceOrExtendArray(this.buffer, length);
        this.clear();
        return array;
    }
    clear() {
        this.length = 0;
        this._resize(0);
        return this;
    }
    _resize(newLength) {
        return this.buffer = (0, buffer_js_1.memcpy)(new this.ArrayType(newLength), this.buffer);
    }
}
exports.BufferBuilder = BufferBuilder;
BufferBuilder.prototype.offset = 0;
/** @ignore */
class DataBufferBuilder extends BufferBuilder {
    last() { return this.get(this.length - 1); }
    get(index) { return this.buffer[index]; }
    set(index, value) {
        this.reserve(index - this.length + 1);
        this.buffer[index * this.stride] = value;
        return this;
    }
}
exports.DataBufferBuilder = DataBufferBuilder;
/** @ignore */
class BitmapBufferBuilder extends DataBufferBuilder {
    constructor(data = new Uint8Array(0)) {
        super(data, 1 / 8);
        this.numValid = 0;
    }
    get numInvalid() { return this.length - this.numValid; }
    get(idx) { return this.buffer[idx >> 3] >> idx % 8 & 1; }
    set(idx, val) {
        const { buffer } = this.reserve(idx - this.length + 1);
        const byte = idx >> 3, bit = idx % 8, cur = buffer[byte] >> bit & 1;
        // If `val` is truthy and the current bit is 0, flip it to 1 and increment `numValid`.
        // If `val` is falsey and the current bit is 1, flip it to 0 and decrement `numValid`.
        val ? cur === 0 && ((buffer[byte] |= (1 << bit)), ++this.numValid)
            : cur === 1 && ((buffer[byte] &= ~(1 << bit)), --this.numValid);
        return this;
    }
    clear() {
        this.numValid = 0;
        return super.clear();
    }
}
exports.BitmapBufferBuilder = BitmapBufferBuilder;
/** @ignore */
class OffsetsBufferBuilder extends DataBufferBuilder {
    constructor(data = new Int32Array(1)) { super(data, 1); }
    append(value) {
        return this.set(this.length - 1, value);
    }
    set(index, value) {
        const offset = this.length - 1;
        const buffer = this.reserve(index - offset + 1).buffer;
        if (offset < index++) {
            buffer.fill(buffer[offset], offset, index);
        }
        buffer[index] = buffer[index - 1] + value;
        return this;
    }
    flush(length = this.length - 1) {
        if (length > this.length) {
            this.set(length - 1, 0);
        }
        return super.flush(length + 1);
    }
}
exports.OffsetsBufferBuilder = OffsetsBufferBuilder;

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