121 lines
4.6 KiB
JavaScript
121 lines
4.6 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.keyForIndex = exports.diffKeys = exports.keyIndex = exports.indirect = exports.readFloat = exports.readUInt = exports.readInt = exports.validateOffset = void 0;
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const bit_width_js_1 = require("./bit-width.js");
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const bit_width_util_js_1 = require("./bit-width-util.js");
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const flexbuffers_util_js_1 = require("./flexbuffers-util.js");
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function validateOffset(dataView, offset, width) {
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if (dataView.byteLength <= offset + width || (offset & ((0, bit_width_util_js_1.toByteWidth)(width) - 1)) !== 0) {
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throw "Bad offset: " + offset + ", width: " + width;
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}
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}
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exports.validateOffset = validateOffset;
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function readInt(dataView, offset, width) {
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if (width < 2) {
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if (width < 1) {
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return dataView.getInt8(offset);
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}
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else {
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return dataView.getInt16(offset, true);
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}
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}
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else {
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if (width < 3) {
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return dataView.getInt32(offset, true);
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}
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else {
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if (dataView.setBigInt64 === undefined) {
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return BigInt(dataView.getUint32(offset, true)) + (BigInt(dataView.getUint32(offset + 4, true)) << BigInt(32));
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}
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return dataView.getBigInt64(offset, true);
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}
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}
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}
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exports.readInt = readInt;
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function readUInt(dataView, offset, width) {
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if (width < 2) {
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if (width < 1) {
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return dataView.getUint8(offset);
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}
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else {
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return dataView.getUint16(offset, true);
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}
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}
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else {
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if (width < 3) {
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return dataView.getUint32(offset, true);
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}
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else {
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if (dataView.getBigUint64 === undefined) {
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return BigInt(dataView.getUint32(offset, true)) + (BigInt(dataView.getUint32(offset + 4, true)) << BigInt(32));
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}
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return dataView.getBigUint64(offset, true);
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}
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}
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}
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exports.readUInt = readUInt;
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function readFloat(dataView, offset, width) {
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if (width < bit_width_js_1.BitWidth.WIDTH32) {
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throw "Bad width: " + width;
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}
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if (width === bit_width_js_1.BitWidth.WIDTH32) {
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return dataView.getFloat32(offset, true);
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}
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return dataView.getFloat64(offset, true);
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}
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exports.readFloat = readFloat;
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function indirect(dataView, offset, width) {
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const step = readUInt(dataView, offset, width);
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return offset - step;
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}
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exports.indirect = indirect;
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function keyIndex(key, dataView, offset, parentWidth, byteWidth, length) {
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const input = (0, flexbuffers_util_js_1.toUTF8Array)(key);
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const keysVectorOffset = indirect(dataView, offset, parentWidth) - byteWidth * 3;
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const bitWidth = (0, bit_width_util_js_1.fromByteWidth)(byteWidth);
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const indirectOffset = keysVectorOffset - Number(readUInt(dataView, keysVectorOffset, bitWidth));
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const _byteWidth = Number(readUInt(dataView, keysVectorOffset + byteWidth, bitWidth));
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let low = 0;
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let high = length - 1;
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while (low <= high) {
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const mid = (high + low) >> 1;
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const dif = diffKeys(input, mid, dataView, indirectOffset, _byteWidth);
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if (dif === 0)
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return mid;
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if (dif < 0) {
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high = mid - 1;
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}
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else {
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low = mid + 1;
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}
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}
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return null;
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}
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exports.keyIndex = keyIndex;
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function diffKeys(input, index, dataView, offset, width) {
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const keyOffset = offset + index * width;
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const keyIndirectOffset = keyOffset - Number(readUInt(dataView, keyOffset, (0, bit_width_util_js_1.fromByteWidth)(width)));
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for (let i = 0; i < input.length; i++) {
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const dif = input[i] - dataView.getUint8(keyIndirectOffset + i);
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if (dif !== 0) {
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return dif;
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}
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}
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return dataView.getUint8(keyIndirectOffset + input.length) === 0 ? 0 : -1;
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}
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exports.diffKeys = diffKeys;
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function keyForIndex(index, dataView, offset, parentWidth, byteWidth) {
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const keysVectorOffset = indirect(dataView, offset, parentWidth) - byteWidth * 3;
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const bitWidth = (0, bit_width_util_js_1.fromByteWidth)(byteWidth);
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const indirectOffset = keysVectorOffset - Number(readUInt(dataView, keysVectorOffset, bitWidth));
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const _byteWidth = Number(readUInt(dataView, keysVectorOffset + byteWidth, bitWidth));
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const keyOffset = indirectOffset + index * _byteWidth;
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const keyIndirectOffset = keyOffset - Number(readUInt(dataView, keyOffset, (0, bit_width_util_js_1.fromByteWidth)(_byteWidth)));
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let length = 0;
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while (dataView.getUint8(keyIndirectOffset + length) !== 0) {
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length++;
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}
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return (0, flexbuffers_util_js_1.fromUTF8Array)(new Uint8Array(dataView.buffer, keyIndirectOffset, length));
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}
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exports.keyForIndex = keyForIndex;
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