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authorGravatar Piotr Russ <mail@pruss.it> 2020-11-18 23:26:45 +0100
committerGravatar Piotr Russ <mail@pruss.it> 2020-11-18 23:26:45 +0100
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tree8b959d50c5a614cbf9fcb346ed556140374d4b6d /node_modules/@webassemblyjs/leb128/esm/bufs.js
parent1870f3fdf43707a15fda0f609a021f516f45eb63 (diff)
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-// Copyright 2012 The Obvious Corporation.
-
-/*
- * bufs: Buffer utilities.
- */
-
-/*
- * Module variables
- */
-
-/** Pool of buffers, where `bufPool[x].length === x`. */
-var bufPool = [];
-/** Maximum length of kept temporary buffers. */
-
-var TEMP_BUF_MAXIMUM_LENGTH = 20;
-/** Minimum exactly-representable 64-bit int. */
-
-var MIN_EXACT_INT64 = -0x8000000000000000;
-/** Maximum exactly-representable 64-bit int. */
-
-var MAX_EXACT_INT64 = 0x7ffffffffffffc00;
-/** Maximum exactly-representable 64-bit uint. */
-
-var MAX_EXACT_UINT64 = 0xfffffffffffff800;
-/**
- * The int value consisting just of a 1 in bit #32 (that is, one more
- * than the maximum 32-bit unsigned value).
- */
-
-var BIT_32 = 0x100000000;
-/**
- * The int value consisting just of a 1 in bit #64 (that is, one more
- * than the maximum 64-bit unsigned value).
- */
-
-var BIT_64 = 0x10000000000000000;
-/*
- * Helper functions
- */
-
-/**
- * Masks off all but the lowest bit set of the given number.
- */
-
-function lowestBit(num) {
- return num & -num;
-}
-/**
- * Gets whether trying to add the second number to the first is lossy
- * (inexact). The first number is meant to be an accumulated result.
- */
-
-
-function isLossyToAdd(accum, num) {
- if (num === 0) {
- return false;
- }
-
- var lowBit = lowestBit(num);
- var added = accum + lowBit;
-
- if (added === accum) {
- return true;
- }
-
- if (added - lowBit !== accum) {
- return true;
- }
-
- return false;
-}
-/*
- * Exported functions
- */
-
-/**
- * Allocates a buffer of the given length, which is initialized
- * with all zeroes. This returns a buffer from the pool if it is
- * available, or a freshly-allocated buffer if not.
- */
-
-
-export function alloc(length) {
- var result = bufPool[length];
-
- if (result) {
- bufPool[length] = undefined;
- } else {
- result = new Buffer(length);
- }
-
- result.fill(0);
- return result;
-}
-/**
- * Releases a buffer back to the pool.
- */
-
-export function free(buffer) {
- var length = buffer.length;
-
- if (length < TEMP_BUF_MAXIMUM_LENGTH) {
- bufPool[length] = buffer;
- }
-}
-/**
- * Resizes a buffer, returning a new buffer. Returns the argument if
- * the length wouldn't actually change. This function is only safe to
- * use if the given buffer was allocated within this module (since
- * otherwise the buffer might possibly be shared externally).
- */
-
-export function resize(buffer, length) {
- if (length === buffer.length) {
- return buffer;
- }
-
- var newBuf = alloc(length);
- buffer.copy(newBuf);
- free(buffer);
- return newBuf;
-}
-/**
- * Reads an arbitrary signed int from a buffer.
- */
-
-export function readInt(buffer) {
- var length = buffer.length;
- var positive = buffer[length - 1] < 0x80;
- var result = positive ? 0 : -1;
- var lossy = false; // Note: We can't use bit manipulation here, since that stops
- // working if the result won't fit in a 32-bit int.
-
- if (length < 7) {
- // Common case which can't possibly be lossy (because the result has
- // no more than 48 bits, and loss only happens with 54 or more).
- for (var i = length - 1; i >= 0; i--) {
- result = result * 0x100 + buffer[i];
- }
- } else {
- for (var _i = length - 1; _i >= 0; _i--) {
- var one = buffer[_i];
- result *= 0x100;
-
- if (isLossyToAdd(result, one)) {
- lossy = true;
- }
-
- result += one;
- }
- }
-
- return {
- value: result,
- lossy: lossy
- };
-}
-/**
- * Reads an arbitrary unsigned int from a buffer.
- */
-
-export function readUInt(buffer) {
- var length = buffer.length;
- var result = 0;
- var lossy = false; // Note: See above in re bit manipulation.
-
- if (length < 7) {
- // Common case which can't possibly be lossy (see above).
- for (var i = length - 1; i >= 0; i--) {
- result = result * 0x100 + buffer[i];
- }
- } else {
- for (var _i2 = length - 1; _i2 >= 0; _i2--) {
- var one = buffer[_i2];
- result *= 0x100;
-
- if (isLossyToAdd(result, one)) {
- lossy = true;
- }
-
- result += one;
- }
- }
-
- return {
- value: result,
- lossy: lossy
- };
-}
-/**
- * Writes a little-endian 64-bit signed int into a buffer.
- */
-
-export function writeInt64(value, buffer) {
- if (value < MIN_EXACT_INT64 || value > MAX_EXACT_INT64) {
- throw new Error("Value out of range.");
- }
-
- if (value < 0) {
- value += BIT_64;
- }
-
- writeUInt64(value, buffer);
-}
-/**
- * Writes a little-endian 64-bit unsigned int into a buffer.
- */
-
-export function writeUInt64(value, buffer) {
- if (value < 0 || value > MAX_EXACT_UINT64) {
- throw new Error("Value out of range.");
- }
-
- var lowWord = value % BIT_32;
- var highWord = Math.floor(value / BIT_32);
- buffer.writeUInt32LE(lowWord, 0);
- buffer.writeUInt32LE(highWord, 4);
-} \ No newline at end of file