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const SHIFT_LEFT_32 = (1 << 16) * (1 << 16);
const SHIFT_RIGHT_32 = 1 / SHIFT_LEFT_32;
// Threshold chosen based on both benchmarking and knowledge about browser string
// data structures (which currently switch structure types at 12 bytes or more)
const TEXT_DECODER_MIN_LENGTH = 12;
const utf8TextDecoder = typeof TextDecoder === 'undefined' ? null : new TextDecoder('utf-8');
const PBF_VARINT = 0; // varint: int32, int64, uint32, uint64, sint32, sint64, bool, enum
const PBF_FIXED64 = 1; // 64-bit: double, fixed64, sfixed64
const PBF_BYTES = 2; // length-delimited: string, bytes, embedded messages, packed repeated fields
const PBF_FIXED32 = 5; // 32-bit: float, fixed32, sfixed32
export default class Pbf {
/**
* @param {Uint8Array | ArrayBuffer} [buf]
*/
constructor(buf = new Uint8Array(16)) {
this.buf = ArrayBuffer.isView(buf) ? buf : new Uint8Array(buf);
this.dataView = new DataView(this.buf.buffer);
this.pos = 0;
this.type = 0;
this.length = this.buf.length;
}
// === READING =================================================================
/**
* @template T
* @param {(tag: number, result: T, pbf: Pbf) => void} readField
* @param {T} result
* @param {number} [end]
*/
readFields(readField, result, end = this.length) {
while (this.pos < end) {
const val = this.readVarint(),
tag = val >> 3,
startPos = this.pos;
this.type = val & 0x7;
readField(tag, result, this);
if (this.pos === startPos) this.skip(val);
}
return result;
}
/**
* @template T
* @param {(tag: number, result: T, pbf: Pbf) => void} readField
* @param {T} result
*/
readMessage(readField, result) {
return this.readFields(readField, result, this.readVarint() + this.pos);
}
readFixed32() {
const val = this.dataView.getUint32(this.pos, true);
this.pos += 4;
return val;
}
readSFixed32() {
const val = this.dataView.getInt32(this.pos, true);
this.pos += 4;
return val;
}
// 64-bit int handling is based on github.com/dpw/node-buffer-more-ints (MIT-licensed)
readFixed64() {
const val = this.dataView.getUint32(this.pos, true) + this.dataView.getUint32(this.pos + 4, true) * SHIFT_LEFT_32;
this.pos += 8;
return val;
}
readSFixed64() {
const val = this.dataView.getUint32(this.pos, true) + this.dataView.getInt32(this.pos + 4, true) * SHIFT_LEFT_32;
this.pos += 8;
return val;
}
readFloat() {
const val = this.dataView.getFloat32(this.pos, true);
this.pos += 4;
return val;
}
readDouble() {
const val = this.dataView.getFloat64(this.pos, true);
this.pos += 8;
return val;
}
/**
* @param {boolean} [isSigned]
*/
readVarint(isSigned) {
const buf = this.buf;
let val, b;
b = buf[this.pos++]; val = b & 0x7f; if (b < 0x80) return val;
b = buf[this.pos++]; val |= (b & 0x7f) << 7; if (b < 0x80) return val;
b = buf[this.pos++]; val |= (b & 0x7f) << 14; if (b < 0x80) return val;
b = buf[this.pos++]; val |= (b & 0x7f) << 21; if (b < 0x80) return val;
b = buf[this.pos]; val |= (b & 0x0f) << 28;
return readVarintRemainder(val, isSigned, this);
}
readVarint64() { // for compatibility with v2.0.1
return this.readVarint(true);
}
readSVarint() {
const num = this.readVarint();
return num % 2 === 1 ? (num + 1) / -2 : num / 2; // zigzag encoding
}
readBoolean() {
return Boolean(this.readVarint());
}
readString() {
const end = this.readVarint() + this.pos;
const pos = this.pos;
this.pos = end;
if (end - pos >= TEXT_DECODER_MIN_LENGTH && utf8TextDecoder) {
// longer strings are fast with the built-in browser TextDecoder API
return utf8TextDecoder.decode(this.buf.subarray(pos, end));
}
// short strings are fast with our custom implementation
return readUtf8(this.buf, pos, end);
}
readBytes() {
const end = this.readVarint() + this.pos,
buffer = this.buf.subarray(this.pos, end);
this.pos = end;
return buffer;
}
// verbose for performance reasons; doesn't affect gzipped size
/**
* @param {number[]} [arr]
* @param {boolean} [isSigned]
*/
readPackedVarint(arr = [], isSigned) {
const end = this.readPackedEnd();
while (this.pos < end) arr.push(this.readVarint(isSigned));
return arr;
}
/** @param {number[]} [arr] */
readPackedSVarint(arr = []) {
const end = this.readPackedEnd();
while (this.pos < end) arr.push(this.readSVarint());
return arr;
}
/** @param {boolean[]} [arr] */
readPackedBoolean(arr = []) {
const end = this.readPackedEnd();
while (this.pos < end) arr.push(this.readBoolean());
return arr;
}
/** @param {number[]} [arr] */
readPackedFloat(arr = []) {
const end = this.readPackedEnd();
while (this.pos < end) arr.push(this.readFloat());
return arr;
}
/** @param {number[]} [arr] */
readPackedDouble(arr = []) {
const end = this.readPackedEnd();
while (this.pos < end) arr.push(this.readDouble());
return arr;
}
/** @param {number[]} [arr] */
readPackedFixed32(arr = []) {
const end = this.readPackedEnd();
while (this.pos < end) arr.push(this.readFixed32());
return arr;
}
/** @param {number[]} [arr] */
readPackedSFixed32(arr = []) {
const end = this.readPackedEnd();
while (this.pos < end) arr.push(this.readSFixed32());
return arr;
}
/** @param {number[]} [arr] */
readPackedFixed64(arr = []) {
const end = this.readPackedEnd();
while (this.pos < end) arr.push(this.readFixed64());
return arr;
}
/** @param {number[]} [arr] */
readPackedSFixed64(arr = []) {
const end = this.readPackedEnd();
while (this.pos < end) arr.push(this.readSFixed64());
return arr;
}
readPackedEnd() {
return this.type === PBF_BYTES ? this.readVarint() + this.pos : this.pos + 1;
}
/** @param {number} val */
skip(val) {
const type = val & 0x7;
if (type === PBF_VARINT) while (this.buf[this.pos++] > 0x7f) {}
else if (type === PBF_BYTES) this.pos = this.readVarint() + this.pos;
else if (type === PBF_FIXED32) this.pos += 4;
else if (type === PBF_FIXED64) this.pos += 8;
else throw new Error(`Unimplemented type: ${type}`);
}
// === WRITING =================================================================
/**
* @param {number} tag
* @param {number} type
*/
writeTag(tag, type) {
this.writeVarint((tag << 3) | type);
}
/** @param {number} min */
realloc(min) {
let length = this.length || 16;
while (length < this.pos + min) length *= 2;
if (length !== this.length) {
const buf = new Uint8Array(length);
buf.set(this.buf);
this.buf = buf;
this.dataView = new DataView(buf.buffer);
this.length = length;
}
}
finish() {
this.length = this.pos;
this.pos = 0;
return this.buf.subarray(0, this.length);
}
/** @param {number} val */
writeFixed32(val) {
this.realloc(4);
this.dataView.setInt32(this.pos, val, true);
this.pos += 4;
}
/** @param {number} val */
writeSFixed32(val) {
this.realloc(4);
this.dataView.setInt32(this.pos, val, true);
this.pos += 4;
}
/** @param {number} val */
writeFixed64(val) {
this.realloc(8);
this.dataView.setInt32(this.pos, val & -1, true);
this.dataView.setInt32(this.pos + 4, Math.floor(val * SHIFT_RIGHT_32), true);
this.pos += 8;
}
/** @param {number} val */
writeSFixed64(val) {
this.realloc(8);
this.dataView.setInt32(this.pos, val & -1, true);
this.dataView.setInt32(this.pos + 4, Math.floor(val * SHIFT_RIGHT_32), true);
this.pos += 8;
}
/** @param {number} val */
writeVarint(val) {
val = +val || 0;
if (val > 0xfffffff || val < 0) {
writeBigVarint(val, this);
return;
}
this.realloc(4);
this.buf[this.pos++] = val & 0x7f | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
this.buf[this.pos++] = ((val >>>= 7) & 0x7f) | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
this.buf[this.pos++] = ((val >>>= 7) & 0x7f) | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
this.buf[this.pos++] = (val >>> 7) & 0x7f;
}
/** @param {number} val */
writeSVarint(val) {
this.writeVarint(val < 0 ? -val * 2 - 1 : val * 2);
}
/** @param {boolean} val */
writeBoolean(val) {
this.writeVarint(+val);
}
/** @param {string} str */
writeString(str) {
str = String(str);
this.realloc(str.length * 4);
this.pos++; // reserve 1 byte for short string length
const startPos = this.pos;
// write the string directly to the buffer and see how much was written
this.pos = writeUtf8(this.buf, str, this.pos);
const len = this.pos - startPos;
if (len >= 0x80) makeRoomForExtraLength(startPos, len, this);
// finally, write the message length in the reserved place and restore the position
this.pos = startPos - 1;
this.writeVarint(len);
this.pos += len;
}
/** @param {number} val */
writeFloat(val) {
this.realloc(4);
this.dataView.setFloat32(this.pos, val, true);
this.pos += 4;
}
/** @param {number} val */
writeDouble(val) {
this.realloc(8);
this.dataView.setFloat64(this.pos, val, true);
this.pos += 8;
}
/** @param {Uint8Array} buffer */
writeBytes(buffer) {
const len = buffer.length;
this.writeVarint(len);
this.realloc(len);
for (let i = 0; i < len; i++) this.buf[this.pos++] = buffer[i];
}
/**
* @template T
* @param {(obj: T, pbf: Pbf) => void} fn
* @param {T} obj
*/
writeRawMessage(fn, obj) {
this.pos++; // reserve 1 byte for short message length
// write the message directly to the buffer and see how much was written
const startPos = this.pos;
fn(obj, this);
const len = this.pos - startPos;
if (len >= 0x80) makeRoomForExtraLength(startPos, len, this);
// finally, write the message length in the reserved place and restore the position
this.pos = startPos - 1;
this.writeVarint(len);
this.pos += len;
}
/**
* @template T
* @param {number} tag
* @param {(obj: T, pbf: Pbf) => void} fn
* @param {T} obj
*/
writeMessage(tag, fn, obj) {
this.writeTag(tag, PBF_BYTES);
this.writeRawMessage(fn, obj);
}
/**
* @param {number} tag
* @param {number[]} arr
*/
writePackedVarint(tag, arr) {
if (arr.length) this.writeMessage(tag, writePackedVarint, arr);
}
/**
* @param {number} tag
* @param {number[]} arr
*/
writePackedSVarint(tag, arr) {
if (arr.length) this.writeMessage(tag, writePackedSVarint, arr);
}
/**
* @param {number} tag
* @param {boolean[]} arr
*/
writePackedBoolean(tag, arr) {
if (arr.length) this.writeMessage(tag, writePackedBoolean, arr);
}
/**
* @param {number} tag
* @param {number[]} arr
*/
writePackedFloat(tag, arr) {
if (arr.length) this.writeMessage(tag, writePackedFloat, arr);
}
/**
* @param {number} tag
* @param {number[]} arr
*/
writePackedDouble(tag, arr) {
if (arr.length) this.writeMessage(tag, writePackedDouble, arr);
}
/**
* @param {number} tag
* @param {number[]} arr
*/
writePackedFixed32(tag, arr) {
if (arr.length) this.writeMessage(tag, writePackedFixed32, arr);
}
/**
* @param {number} tag
* @param {number[]} arr
*/
writePackedSFixed32(tag, arr) {
if (arr.length) this.writeMessage(tag, writePackedSFixed32, arr);
}
/**
* @param {number} tag
* @param {number[]} arr
*/
writePackedFixed64(tag, arr) {
if (arr.length) this.writeMessage(tag, writePackedFixed64, arr);
}
/**
* @param {number} tag
* @param {number[]} arr
*/
writePackedSFixed64(tag, arr) {
if (arr.length) this.writeMessage(tag, writePackedSFixed64, arr);
}
/**
* @param {number} tag
* @param {Uint8Array} buffer
*/
writeBytesField(tag, buffer) {
this.writeTag(tag, PBF_BYTES);
this.writeBytes(buffer);
}
/**
* @param {number} tag
* @param {number} val
*/
writeFixed32Field(tag, val) {
this.writeTag(tag, PBF_FIXED32);
this.writeFixed32(val);
}
/**
* @param {number} tag
* @param {number} val
*/
writeSFixed32Field(tag, val) {
this.writeTag(tag, PBF_FIXED32);
this.writeSFixed32(val);
}
/**
* @param {number} tag
* @param {number} val
*/
writeFixed64Field(tag, val) {
this.writeTag(tag, PBF_FIXED64);
this.writeFixed64(val);
}
/**
* @param {number} tag
* @param {number} val
*/
writeSFixed64Field(tag, val) {
this.writeTag(tag, PBF_FIXED64);
this.writeSFixed64(val);
}
/**
* @param {number} tag
* @param {number} val
*/
writeVarintField(tag, val) {
this.writeTag(tag, PBF_VARINT);
this.writeVarint(val);
}
/**
* @param {number} tag
* @param {number} val
*/
writeSVarintField(tag, val) {
this.writeTag(tag, PBF_VARINT);
this.writeSVarint(val);
}
/**
* @param {number} tag
* @param {string} str
*/
writeStringField(tag, str) {
this.writeTag(tag, PBF_BYTES);
this.writeString(str);
}
/**
* @param {number} tag
* @param {number} val
*/
writeFloatField(tag, val) {
this.writeTag(tag, PBF_FIXED32);
this.writeFloat(val);
}
/**
* @param {number} tag
* @param {number} val
*/
writeDoubleField(tag, val) {
this.writeTag(tag, PBF_FIXED64);
this.writeDouble(val);
}
/**
* @param {number} tag
* @param {boolean} val
*/
writeBooleanField(tag, val) {
this.writeVarintField(tag, +val);
}
};
/**
* @param {number} l
* @param {boolean | undefined} s
* @param {Pbf} p
*/
function readVarintRemainder(l, s, p) {
const buf = p.buf;
let h, b;
b = buf[p.pos++]; h = (b & 0x70) >> 4; if (b < 0x80) return toNum(l, h, s);
b = buf[p.pos++]; h |= (b & 0x7f) << 3; if (b < 0x80) return toNum(l, h, s);
b = buf[p.pos++]; h |= (b & 0x7f) << 10; if (b < 0x80) return toNum(l, h, s);
b = buf[p.pos++]; h |= (b & 0x7f) << 17; if (b < 0x80) return toNum(l, h, s);
b = buf[p.pos++]; h |= (b & 0x7f) << 24; if (b < 0x80) return toNum(l, h, s);
b = buf[p.pos++]; h |= (b & 0x01) << 31; if (b < 0x80) return toNum(l, h, s);
throw new Error('Expected varint not more than 10 bytes');
}
/**
* @param {number} low
* @param {number} high
* @param {boolean} [isSigned]
*/
function toNum(low, high, isSigned) {
return isSigned ? high * 0x100000000 + (low >>> 0) : ((high >>> 0) * 0x100000000) + (low >>> 0);
}
/**
* @param {number} val
* @param {Pbf} pbf
*/
function writeBigVarint(val, pbf) {
let low, high;
if (val >= 0) {
low = (val % 0x100000000) | 0;
high = (val / 0x100000000) | 0;
} else {
low = ~(-val % 0x100000000);
high = ~(-val / 0x100000000);
if (low ^ 0xffffffff) {
low = (low + 1) | 0;
} else {
low = 0;
high = (high + 1) | 0;
}
}
if (val >= 0x10000000000000000 || val < -0x10000000000000000) {
throw new Error('Given varint doesn\'t fit into 10 bytes');
}
pbf.realloc(10);
writeBigVarintLow(low, high, pbf);
writeBigVarintHigh(high, pbf);
}
/**
* @param {number} high
* @param {number} low
* @param {Pbf} pbf
*/
function writeBigVarintLow(low, high, pbf) {
pbf.buf[pbf.pos++] = low & 0x7f | 0x80; low >>>= 7;
pbf.buf[pbf.pos++] = low & 0x7f | 0x80; low >>>= 7;
pbf.buf[pbf.pos++] = low & 0x7f | 0x80; low >>>= 7;
pbf.buf[pbf.pos++] = low & 0x7f | 0x80; low >>>= 7;
pbf.buf[pbf.pos] = low & 0x7f;
}
/**
* @param {number} high
* @param {Pbf} pbf
*/
function writeBigVarintHigh(high, pbf) {
const lsb = (high & 0x07) << 4;
pbf.buf[pbf.pos++] |= lsb | ((high >>>= 3) ? 0x80 : 0); if (!high) return;
pbf.buf[pbf.pos++] = high & 0x7f | ((high >>>= 7) ? 0x80 : 0); if (!high) return;
pbf.buf[pbf.pos++] = high & 0x7f | ((high >>>= 7) ? 0x80 : 0); if (!high) return;
pbf.buf[pbf.pos++] = high & 0x7f | ((high >>>= 7) ? 0x80 : 0); if (!high) return;
pbf.buf[pbf.pos++] = high & 0x7f | ((high >>>= 7) ? 0x80 : 0); if (!high) return;
pbf.buf[pbf.pos++] = high & 0x7f;
}
/**
* @param {number} startPos
* @param {number} len
* @param {Pbf} pbf
*/
function makeRoomForExtraLength(startPos, len, pbf) {
const extraLen =
len <= 0x3fff ? 1 :
len <= 0x1fffff ? 2 :
len <= 0xfffffff ? 3 : Math.floor(Math.log(len) / (Math.LN2 * 7));
// if 1 byte isn't enough for encoding message length, shift the data to the right
pbf.realloc(extraLen);
for (let i = pbf.pos - 1; i >= startPos; i--) pbf.buf[i + extraLen] = pbf.buf[i];
}
/**
* @param {number[]} arr
* @param {Pbf} pbf
*/
function writePackedVarint(arr, pbf) {
for (let i = 0; i < arr.length; i++) pbf.writeVarint(arr[i]);
}
/**
* @param {number[]} arr
* @param {Pbf} pbf
*/
function writePackedSVarint(arr, pbf) {
for (let i = 0; i < arr.length; i++) pbf.writeSVarint(arr[i]);
}
/**
* @param {number[]} arr
* @param {Pbf} pbf
*/
function writePackedFloat(arr, pbf) {
for (let i = 0; i < arr.length; i++) pbf.writeFloat(arr[i]);
}
/**
* @param {number[]} arr
* @param {Pbf} pbf
*/
function writePackedDouble(arr, pbf) {
for (let i = 0; i < arr.length; i++) pbf.writeDouble(arr[i]);
}
/**
* @param {boolean[]} arr
* @param {Pbf} pbf
*/
function writePackedBoolean(arr, pbf) {
for (let i = 0; i < arr.length; i++) pbf.writeBoolean(arr[i]);
}
/**
* @param {number[]} arr
* @param {Pbf} pbf
*/
function writePackedFixed32(arr, pbf) {
for (let i = 0; i < arr.length; i++) pbf.writeFixed32(arr[i]);
}
/**
* @param {number[]} arr
* @param {Pbf} pbf
*/
function writePackedSFixed32(arr, pbf) {
for (let i = 0; i < arr.length; i++) pbf.writeSFixed32(arr[i]);
}
/**
* @param {number[]} arr
* @param {Pbf} pbf
*/
function writePackedFixed64(arr, pbf) {
for (let i = 0; i < arr.length; i++) pbf.writeFixed64(arr[i]);
}
/**
* @param {number[]} arr
* @param {Pbf} pbf
*/
function writePackedSFixed64(arr, pbf) {
for (let i = 0; i < arr.length; i++) pbf.writeSFixed64(arr[i]);
}
// Buffer code below from https://github.com/feross/buffer, MIT-licensed
/**
* @param {Uint8Array} buf
* @param {number} pos
* @param {number} end
*/
function readUtf8(buf, pos, end) {
let str = '';
let i = pos;
while (i < end) {
const b0 = buf[i];
let c = null; // codepoint
let bytesPerSequence =
b0 > 0xEF ? 4 :
b0 > 0xDF ? 3 :
b0 > 0xBF ? 2 : 1;
if (i + bytesPerSequence > end) break;
let b1, b2, b3;
if (bytesPerSequence === 1) {
if (b0 < 0x80) {
c = b0;
}
} else if (bytesPerSequence === 2) {
b1 = buf[i + 1];
if ((b1 & 0xC0) === 0x80) {
c = (b0 & 0x1F) << 0x6 | (b1 & 0x3F);
if (c <= 0x7F) {
c = null;
}
}
} else if (bytesPerSequence === 3) {
b1 = buf[i + 1];
b2 = buf[i + 2];
if ((b1 & 0xC0) === 0x80 && (b2 & 0xC0) === 0x80) {
c = (b0 & 0xF) << 0xC | (b1 & 0x3F) << 0x6 | (b2 & 0x3F);
if (c <= 0x7FF || (c >= 0xD800 && c <= 0xDFFF)) {
c = null;
}
}
} else if (bytesPerSequence === 4) {
b1 = buf[i + 1];
b2 = buf[i + 2];
b3 = buf[i + 3];
if ((b1 & 0xC0) === 0x80 && (b2 & 0xC0) === 0x80 && (b3 & 0xC0) === 0x80) {
c = (b0 & 0xF) << 0x12 | (b1 & 0x3F) << 0xC | (b2 & 0x3F) << 0x6 | (b3 & 0x3F);
if (c <= 0xFFFF || c >= 0x110000) {
c = null;
}
}
}
if (c === null) {
c = 0xFFFD;
bytesPerSequence = 1;
} else if (c > 0xFFFF) {
c -= 0x10000;
str += String.fromCharCode(c >>> 10 & 0x3FF | 0xD800);
c = 0xDC00 | c & 0x3FF;
}
str += String.fromCharCode(c);
i += bytesPerSequence;
}
return str;
}
/**
* @param {Uint8Array} buf
* @param {string} str
* @param {number} pos
*/
function writeUtf8(buf, str, pos) {
for (let i = 0, c, lead; i < str.length; i++) {
c = str.charCodeAt(i); // code point
if (c > 0xD7FF && c < 0xE000) {
if (lead) {
if (c < 0xDC00) {
buf[pos++] = 0xEF;
buf[pos++] = 0xBF;
buf[pos++] = 0xBD;
lead = c;
continue;
} else {
c = lead - 0xD800 << 10 | c - 0xDC00 | 0x10000;
lead = null;
}
} else {
if (c > 0xDBFF || (i + 1 === str.length)) {
buf[pos++] = 0xEF;
buf[pos++] = 0xBF;
buf[pos++] = 0xBD;
} else {
lead = c;
}
continue;
}
} else if (lead) {
buf[pos++] = 0xEF;
buf[pos++] = 0xBF;
buf[pos++] = 0xBD;
lead = null;
}
if (c < 0x80) {
buf[pos++] = c;
} else {
if (c < 0x800) {
buf[pos++] = c >> 0x6 | 0xC0;
} else {
if (c < 0x10000) {
buf[pos++] = c >> 0xC | 0xE0;
} else {
buf[pos++] = c >> 0x12 | 0xF0;
buf[pos++] = c >> 0xC & 0x3F | 0x80;
}
buf[pos++] = c >> 0x6 & 0x3F | 0x80;
}
buf[pos++] = c & 0x3F | 0x80;
}
}
return pos;
}