maybe fix length issue
This commit is contained in:
Moon Man
parent
8dab4d57fa
commit
f2bd5e4795
|
|
@ -134,7 +134,7 @@ export declare class Bert {
|
|||
readonly [Symbol.unscopables]?: boolean | undefined;
|
||||
};
|
||||
};
|
||||
encode: (obj: any, noCopy?: boolean) => Buffer;
|
||||
encode: (obj: any, copy?: boolean) => Buffer;
|
||||
decode: (buffer: Buffer) => any;
|
||||
encode_string: (obj: string, buffer: Buffer) => Buffer;
|
||||
encode_boolean: (obj: boolean, buffer: Buffer) => any;
|
||||
|
|
|
|||
|
|
@ -38,18 +38,18 @@ export class Bert {
|
|||
toAtom = toAtom;
|
||||
toTuple = toTuple;
|
||||
#encode = (obj, buffer) => this[`encode_${typeof obj}`](obj, buffer);
|
||||
encode = (obj, noCopy = false) => {
|
||||
encode = (obj, copy = true) => {
|
||||
const tailBuffer = this.#encode(obj, Buffer.from(this.outputBuffer, 1));
|
||||
if (tailBuffer.length === 0) {
|
||||
throw new Error("Bert encode a too big term, encoding buffer overflow");
|
||||
}
|
||||
else if (noCopy) {
|
||||
return Buffer.from(this.outputBuffer, 0, this.outputBuffer.length - tailBuffer.length);
|
||||
else if (copy) {
|
||||
const ret = Buffer.alloc(tailBuffer.length);
|
||||
this.outputBuffer.copy(ret, 0, 0, ret.length);
|
||||
return ret;
|
||||
}
|
||||
else {
|
||||
const res = Buffer.alloc(this.outputBuffer.length - tailBuffer.length);
|
||||
this.outputBuffer.copy(res, 0, 0, res.length);
|
||||
return res;
|
||||
return Buffer.from(this.outputBuffer, 0, tailBuffer.length);
|
||||
}
|
||||
};
|
||||
#decode = (buffer) => {
|
||||
|
|
@ -106,7 +106,7 @@ export class Bert {
|
|||
}
|
||||
else {
|
||||
buffer[0] = Types.STRING;
|
||||
buffer.writeUInt16BE(obj.length, 1);
|
||||
buffer.writeUInt16BE(Buffer.byteLength(obj, "utf-8"), 1);
|
||||
const len = buffer.write(obj, 3);
|
||||
return Buffer.from(buffer, 0, 3 + len);
|
||||
}
|
||||
|
|
@ -201,8 +201,8 @@ export class Bert {
|
|||
encode_binary = (obj, buffer) => {
|
||||
buffer[0] = Types.BINARY;
|
||||
buffer.writeUInt32BE(obj.length, 1);
|
||||
obj.copy(buffer, 5);
|
||||
return Buffer.from(buffer, 0, 5 + obj.length);
|
||||
const len = obj.copy(buffer, 5);
|
||||
return Buffer.from(buffer, 0, 5 + len);
|
||||
};
|
||||
encode_undefined = (_obj, buffer) => {
|
||||
return this.#encode(null, buffer);
|
||||
|
|
|
|||
929
src/bert.ts
929
src/bert.ts
|
|
@ -1,484 +1,487 @@
|
|||
export const Types = {
|
||||
BERT_START: 131,
|
||||
SMALL_ATOM: 115,
|
||||
ATOM: 100,
|
||||
BINARY: 109,
|
||||
SMALL_INTEGER: 97,
|
||||
INTEGER: 98,
|
||||
SMALL_BIG: 110,
|
||||
LARGE_BIG: 111,
|
||||
FLOAT: 99,
|
||||
STRING: 107,
|
||||
LIST: 108,
|
||||
SMALL_TUPLE: 104,
|
||||
LARGE_TUPLE: 105, // TODO: Implement.
|
||||
MAP: 116,
|
||||
NIL: 106,
|
||||
NEW_FLOAT: 70,
|
||||
ZERO: 0,
|
||||
BERT_START: 131,
|
||||
SMALL_ATOM: 115,
|
||||
ATOM: 100,
|
||||
BINARY: 109,
|
||||
SMALL_INTEGER: 97,
|
||||
INTEGER: 98,
|
||||
SMALL_BIG: 110,
|
||||
LARGE_BIG: 111,
|
||||
FLOAT: 99,
|
||||
STRING: 107,
|
||||
LIST: 108,
|
||||
SMALL_TUPLE: 104,
|
||||
LARGE_TUPLE: 105, // TODO: Implement.
|
||||
MAP: 116,
|
||||
NIL: 106,
|
||||
NEW_FLOAT: 70,
|
||||
ZERO: 0,
|
||||
};
|
||||
|
||||
export const Lang = {
|
||||
ELIXIR: 0,
|
||||
ERLANG: 1,
|
||||
ELIXIR: 0,
|
||||
ERLANG: 1,
|
||||
};
|
||||
|
||||
export class Bert {
|
||||
private allBinariesAsString;
|
||||
private mapKeyAsAtom;
|
||||
private decodeUndefinedValues;
|
||||
private convention;
|
||||
private outputBuffer;
|
||||
private allBinariesAsString;
|
||||
private mapKeyAsAtom;
|
||||
private decodeUndefinedValues;
|
||||
private convention;
|
||||
private outputBuffer;
|
||||
|
||||
constructor(
|
||||
allBinariesAsString = false,
|
||||
mapKeyAsAtom = true,
|
||||
decodeUndefinedValues = true,
|
||||
convention = Lang.ELIXIR,
|
||||
) {
|
||||
this.allBinariesAsString = allBinariesAsString;
|
||||
this.mapKeyAsAtom = mapKeyAsAtom;
|
||||
this.decodeUndefinedValues = decodeUndefinedValues;
|
||||
this.convention = convention;
|
||||
this.outputBuffer = Buffer.alloc(10000000);
|
||||
this.outputBuffer[0] = Types.BERT_START;
|
||||
}
|
||||
|
||||
toAtom = toAtom;
|
||||
toTuple = toTuple;
|
||||
|
||||
#encode = (obj: any, buffer: Buffer) =>
|
||||
(this as any)[`encode_${typeof obj}`](obj, buffer);
|
||||
|
||||
encode = (obj: any, noCopy = false) => {
|
||||
const tailBuffer = this.#encode(obj, Buffer.from(this.outputBuffer, 1));
|
||||
if (tailBuffer.length === 0) {
|
||||
throw new Error("Bert encode a too big term, encoding buffer overflow");
|
||||
} else if (noCopy) {
|
||||
return Buffer.from(
|
||||
this.outputBuffer,
|
||||
0,
|
||||
this.outputBuffer.length - tailBuffer.length,
|
||||
);
|
||||
} else {
|
||||
const res = Buffer.alloc(this.outputBuffer.length - tailBuffer.length);
|
||||
this.outputBuffer.copy(res, 0, 0, res.length);
|
||||
return res;
|
||||
}
|
||||
};
|
||||
|
||||
#decode = (buffer: Buffer): any => {
|
||||
const t = buffer[0];
|
||||
buffer = Buffer.from(buffer, 1);
|
||||
|
||||
switch (t) {
|
||||
case Types.SMALL_ATOM:
|
||||
return this.decode_atom(buffer, 1);
|
||||
case Types.ATOM:
|
||||
return this.decode_atom(buffer, 2);
|
||||
case Types.BINARY:
|
||||
return this.decode_binary(buffer);
|
||||
case Types.SMALL_INTEGER:
|
||||
return this.decode_integer(buffer, 1, true);
|
||||
case Types.INTEGER:
|
||||
return this.decode_integer(buffer, 4);
|
||||
case Types.SMALL_BIG:
|
||||
return this.decode_big(buffer, 1);
|
||||
case Types.LARGE_BIG:
|
||||
return this.decode_big(buffer, 4);
|
||||
case Types.FLOAT:
|
||||
return this.decode_float(buffer);
|
||||
case Types.NEW_FLOAT:
|
||||
return this.decode_new_float(buffer);
|
||||
case Types.STRING:
|
||||
return this.decode_string(buffer);
|
||||
case Types.LIST:
|
||||
return this.decode_list(buffer);
|
||||
case Types.SMALL_TUPLE:
|
||||
return this.decode_tuple(buffer, 1);
|
||||
// case Types.LARGE_TUPLE:
|
||||
// return this.decode_large_tuple(buffer, 4)
|
||||
case Types.NIL:
|
||||
return this.decode_nil(buffer);
|
||||
case Types.MAP:
|
||||
return this.decode_map(buffer);
|
||||
default:
|
||||
throw new Error(`Unexpected BERT type: ${t}`);
|
||||
}
|
||||
};
|
||||
|
||||
decode = (buffer: Buffer) => {
|
||||
if (buffer[0] !== Types.BERT_START) {
|
||||
throw new Error("Not a valid BERT");
|
||||
}
|
||||
|
||||
const obj = this.#decode(Buffer.from(buffer, 1));
|
||||
|
||||
if (obj.rest.length !== 0) {
|
||||
throw new Error("Invalid BERT");
|
||||
}
|
||||
|
||||
return obj.value;
|
||||
};
|
||||
|
||||
encode_string = (obj: string, buffer: Buffer) => {
|
||||
if (this.convention === Lang.ELIXIR) {
|
||||
return this.encode_binary(Buffer.from(obj), buffer);
|
||||
}
|
||||
else {
|
||||
buffer[0] = Types.STRING;
|
||||
buffer.writeUInt16BE(obj.length, 1);
|
||||
const len = buffer.write(obj, 3);
|
||||
return Buffer.from(buffer, 0, 3 + len);
|
||||
}
|
||||
};
|
||||
|
||||
encode_boolean = (obj: boolean, buffer: Buffer) => {
|
||||
if (obj) {
|
||||
return this.#encode(this.toAtom("true"), buffer);
|
||||
} else {
|
||||
return this.#encode(this.toAtom("false"), buffer);
|
||||
}
|
||||
};
|
||||
|
||||
encode_number = (obj: number, buffer: Buffer) => {
|
||||
const isInteger = obj % 1 === 0;
|
||||
|
||||
// Handle floats...
|
||||
if (!isInteger) {
|
||||
return this.encode_float(obj, buffer);
|
||||
}
|
||||
|
||||
// Small int...
|
||||
if (isInteger && obj >= 0 && obj < 256) {
|
||||
buffer[0] = Types.SMALL_INTEGER;
|
||||
buffer.writeUInt8(obj, 1);
|
||||
return Buffer.from(buffer, 0, 2);
|
||||
}
|
||||
|
||||
// 4 byte int...
|
||||
if (isInteger && obj >= -134217728 && obj <= 134217727) {
|
||||
buffer[0] = Types.INTEGER;
|
||||
buffer.writeInt32BE(obj, 1);
|
||||
return Buffer.from(buffer, 0, 5);
|
||||
}
|
||||
|
||||
// Bignum...
|
||||
const numBuffer = Buffer.alloc(buffer.length);
|
||||
if (obj < 0) {
|
||||
obj *= -1;
|
||||
numBuffer[0] = 1;
|
||||
} else {
|
||||
numBuffer[0] = 0;
|
||||
}
|
||||
|
||||
let offset = 1;
|
||||
while (obj !== 0) {
|
||||
numBuffer[offset] = obj % 256;
|
||||
obj = Math.floor(obj / 256);
|
||||
offset++;
|
||||
}
|
||||
|
||||
if (offset < 256) {
|
||||
buffer[0] = Types.SMALL_BIG;
|
||||
buffer.writeUInt8(offset - 1, 1);
|
||||
numBuffer.copy(buffer, 2, 0, offset);
|
||||
return Buffer.from(buffer, 0, 2 + offset);
|
||||
} else {
|
||||
buffer[0] = Types.LARGE_BIG;
|
||||
buffer.writeUInt32BE(offset - 1, 1);
|
||||
numBuffer.copy(buffer, 5, 0, offset);
|
||||
return Buffer.from(buffer, 0, 5 + offset);
|
||||
}
|
||||
};
|
||||
|
||||
encode_float = (obj: number, buffer: Buffer) => {
|
||||
// float...
|
||||
buffer[0] = Types.NEW_FLOAT;
|
||||
buffer.writeDoubleBE(obj, 1);
|
||||
return Buffer.from(buffer, 0, 9);
|
||||
};
|
||||
|
||||
encode_object = (obj: any, buffer: Buffer) => {
|
||||
// Check if it's an atom, binary, or tuple...
|
||||
if (obj === null) {
|
||||
const undefinedAtom =
|
||||
this.convention === Lang.ELIXIR ? "nil" : "undefined";
|
||||
return this.#encode(this.toAtom(undefinedAtom), buffer);
|
||||
}
|
||||
|
||||
if (Buffer.isBuffer(obj)) {
|
||||
return this.encode_binary(obj, buffer);
|
||||
}
|
||||
if (Array.isArray(obj)) {
|
||||
return this.encode_array(obj, buffer);
|
||||
}
|
||||
if (obj.type === "Atom") {
|
||||
return this.encode_atom(obj, buffer);
|
||||
}
|
||||
if (obj.type === "Tuple") {
|
||||
return this.encode_tuple(obj, buffer);
|
||||
}
|
||||
// Treat the object as an associative array...
|
||||
return this.encode_map(obj, buffer);
|
||||
};
|
||||
|
||||
encode_atom = (obj: any, buffer: Buffer) => {
|
||||
buffer[0] = Types.ATOM;
|
||||
buffer.writeUInt16BE(obj.value.length, 1);
|
||||
const len = buffer.write(obj.value, 3);
|
||||
return Buffer.from(buffer, 0, 3 + len);
|
||||
};
|
||||
|
||||
encode_binary = (obj: Buffer, buffer: Buffer) => {
|
||||
buffer[0] = Types.BINARY;
|
||||
buffer.writeUInt32BE(obj.length, 1);
|
||||
obj.copy(buffer, 5);
|
||||
return Buffer.from(buffer, 0, 5 + obj.length);
|
||||
};
|
||||
|
||||
encode_undefined = (_obj: Buffer, buffer: Buffer) => {
|
||||
return this.#encode(null, buffer);
|
||||
};
|
||||
|
||||
encode_tuple = (obj: Buffer, buffer: Buffer) => {
|
||||
if (obj.length < 256) {
|
||||
buffer[0] = Types.SMALL_TUPLE;
|
||||
buffer.writeUInt8(obj.length, 1);
|
||||
buffer = Buffer.from(buffer, 0, 2);
|
||||
} else {
|
||||
buffer[0] = Types.LARGE_TUPLE;
|
||||
buffer.writeUInt32BE(obj.length, 1);
|
||||
buffer = Buffer.from(buffer, 0, 5);
|
||||
}
|
||||
|
||||
for (let i = 0; i < obj.length; ++i) {
|
||||
buffer = this.#encode(obj[i], buffer);
|
||||
}
|
||||
|
||||
return buffer;
|
||||
};
|
||||
|
||||
encode_array = (obj: any[], buffer: Buffer) => {
|
||||
if (obj.length === 0) {
|
||||
buffer[0] = Types.NIL;
|
||||
return Buffer.from(buffer, 0, 1);
|
||||
}
|
||||
|
||||
buffer[0] = Types.LIST;
|
||||
buffer.writeUInt32BE(obj.length, 1);
|
||||
buffer = Buffer.from(buffer, 0, 5);
|
||||
|
||||
for (let i = 0; i < obj.length; ++i) {
|
||||
buffer = this.#encode(obj[i], buffer);
|
||||
}
|
||||
buffer[0] = Types.NIL;
|
||||
return Buffer.from(buffer, 0, 1);
|
||||
};
|
||||
|
||||
encode_map = (obj: Record<string, any>, buffer: Buffer) => {
|
||||
const keys = Object.keys(obj);
|
||||
buffer[0] = Types.MAP;
|
||||
buffer.writeUInt32BE(keys.length, 1);
|
||||
buffer = Buffer.from(buffer, 0, 5);
|
||||
|
||||
for (let i = 0; i < keys.length; ++i) {
|
||||
const key = this.mapKeyAsAtom ? this.toAtom(keys[i]) : keys[i];
|
||||
buffer = this.#encode(key, buffer);
|
||||
buffer = this.#encode(obj[keys[i]], buffer);
|
||||
}
|
||||
return buffer;
|
||||
};
|
||||
|
||||
decode_atom = (buffer: Buffer, count: 1 | 2 | 4) => {
|
||||
const size = this.bytesToInt(buffer, count, true);
|
||||
buffer = Buffer.from(buffer, count);
|
||||
let value: any = buffer.toString("utf8", 0, size);
|
||||
if (value === "true") {
|
||||
value = true;
|
||||
} else if (value === "false") {
|
||||
value = false;
|
||||
} else if (
|
||||
this.decodeUndefinedValues &&
|
||||
this.convention === Lang.ELIXIR &&
|
||||
value === "nil"
|
||||
constructor(
|
||||
allBinariesAsString = false,
|
||||
mapKeyAsAtom = true,
|
||||
decodeUndefinedValues = true,
|
||||
convention = Lang.ELIXIR,
|
||||
) {
|
||||
value = null;
|
||||
} else if (
|
||||
this.decodeUndefinedValues &&
|
||||
this.convention === Lang.ERLANG &&
|
||||
value === "undefined"
|
||||
) {
|
||||
value = null;
|
||||
} else {
|
||||
value = this.toAtom(value);
|
||||
}
|
||||
return {
|
||||
value,
|
||||
rest: Buffer.from(buffer, size),
|
||||
};
|
||||
};
|
||||
|
||||
decode_binary = (buffer: Buffer) => {
|
||||
const size = this.bytesToInt(buffer, 4, true);
|
||||
buffer = Buffer.from(buffer, 4);
|
||||
const bin = Buffer.alloc(size);
|
||||
buffer.copy(bin, 0, 0, size);
|
||||
return {
|
||||
value:
|
||||
this.convention === Lang.ELIXIR && this.allBinariesAsString
|
||||
? bin.toString()
|
||||
: bin,
|
||||
rest: Buffer.from(buffer, size),
|
||||
};
|
||||
};
|
||||
|
||||
decode_integer = (buffer: Buffer, count: 1 | 2 | 4, unsigned = false) => {
|
||||
return {
|
||||
value: this.bytesToInt(buffer, count, unsigned),
|
||||
rest: Buffer.from(buffer, count),
|
||||
};
|
||||
};
|
||||
|
||||
decode_big = (buffer: Buffer, count: 1 | 2 | 4) => {
|
||||
const size = this.bytesToInt(buffer, count, false);
|
||||
buffer = Buffer.from(buffer, count);
|
||||
|
||||
let num = 0;
|
||||
const isNegative = buffer[0] === 1;
|
||||
|
||||
buffer = Buffer.from(buffer, 1);
|
||||
|
||||
for (let i = size - 1; i >= 0; --i) {
|
||||
const n = buffer[i];
|
||||
if (num === 0) {
|
||||
num = n;
|
||||
} else {
|
||||
num = num * 256 + n;
|
||||
}
|
||||
}
|
||||
if (isNegative) {
|
||||
num = num * -1;
|
||||
this.allBinariesAsString = allBinariesAsString;
|
||||
this.mapKeyAsAtom = mapKeyAsAtom;
|
||||
this.decodeUndefinedValues = decodeUndefinedValues;
|
||||
this.convention = convention;
|
||||
this.outputBuffer = Buffer.alloc(10000000);
|
||||
this.outputBuffer[0] = Types.BERT_START;
|
||||
}
|
||||
|
||||
return {
|
||||
value: num,
|
||||
rest: Buffer.from(buffer, size),
|
||||
toAtom = toAtom;
|
||||
toTuple = toTuple;
|
||||
|
||||
#encode = (obj: any, buffer: Buffer) =>
|
||||
(this as any)[`encode_${typeof obj}`](obj, buffer);
|
||||
|
||||
encode = (obj: any, copy = true) => {
|
||||
const tailBuffer = this.#encode(obj, Buffer.from(this.outputBuffer, 1));
|
||||
|
||||
if (tailBuffer.length === 0) {
|
||||
throw new Error("Bert encode a too big term, encoding buffer overflow");
|
||||
}
|
||||
else if (copy) {
|
||||
const ret = Buffer.alloc(tailBuffer.length);
|
||||
this.outputBuffer.copy(ret, 0, 0, ret.length);
|
||||
return ret;
|
||||
}
|
||||
else {
|
||||
return Buffer.from(
|
||||
this.outputBuffer,
|
||||
0,
|
||||
tailBuffer.length,
|
||||
);
|
||||
}
|
||||
};
|
||||
};
|
||||
|
||||
decode_float = (buffer: Buffer) => {
|
||||
const size = 31;
|
||||
#decode = (buffer: Buffer): any => {
|
||||
const t = buffer[0];
|
||||
buffer = Buffer.from(buffer, 1);
|
||||
|
||||
return {
|
||||
value: parseFloat(buffer.toString("utf8", 0, size)),
|
||||
rest: Buffer.from(buffer, size),
|
||||
switch (t) {
|
||||
case Types.SMALL_ATOM:
|
||||
return this.decode_atom(buffer, 1);
|
||||
case Types.ATOM:
|
||||
return this.decode_atom(buffer, 2);
|
||||
case Types.BINARY:
|
||||
return this.decode_binary(buffer);
|
||||
case Types.SMALL_INTEGER:
|
||||
return this.decode_integer(buffer, 1, true);
|
||||
case Types.INTEGER:
|
||||
return this.decode_integer(buffer, 4);
|
||||
case Types.SMALL_BIG:
|
||||
return this.decode_big(buffer, 1);
|
||||
case Types.LARGE_BIG:
|
||||
return this.decode_big(buffer, 4);
|
||||
case Types.FLOAT:
|
||||
return this.decode_float(buffer);
|
||||
case Types.NEW_FLOAT:
|
||||
return this.decode_new_float(buffer);
|
||||
case Types.STRING:
|
||||
return this.decode_string(buffer);
|
||||
case Types.LIST:
|
||||
return this.decode_list(buffer);
|
||||
case Types.SMALL_TUPLE:
|
||||
return this.decode_tuple(buffer, 1);
|
||||
// case Types.LARGE_TUPLE:
|
||||
// return this.decode_large_tuple(buffer, 4)
|
||||
case Types.NIL:
|
||||
return this.decode_nil(buffer);
|
||||
case Types.MAP:
|
||||
return this.decode_map(buffer);
|
||||
default:
|
||||
throw new Error(`Unexpected BERT type: ${t}`);
|
||||
}
|
||||
};
|
||||
};
|
||||
|
||||
decode_new_float = (buffer: Buffer) => {
|
||||
return {
|
||||
value: buffer.readDoubleBE(0),
|
||||
rest: Buffer.from(buffer, 8),
|
||||
decode = (buffer: Buffer) => {
|
||||
if (buffer[0] !== Types.BERT_START) {
|
||||
throw new Error("Not a valid BERT");
|
||||
}
|
||||
|
||||
const obj = this.#decode(Buffer.from(buffer, 1));
|
||||
|
||||
if (obj.rest.length !== 0) {
|
||||
throw new Error("Invalid BERT");
|
||||
}
|
||||
|
||||
return obj.value;
|
||||
};
|
||||
};
|
||||
|
||||
decode_string = (buffer: Buffer) => {
|
||||
const size = this.bytesToInt(buffer, 2, true);
|
||||
|
||||
buffer = Buffer.from(buffer, 2);
|
||||
|
||||
return {
|
||||
value: buffer.toString("utf8", 0, size),
|
||||
rest: Buffer.from(buffer, size),
|
||||
encode_string = (obj: string, buffer: Buffer) => {
|
||||
if (this.convention === Lang.ELIXIR) {
|
||||
return this.encode_binary(Buffer.from(obj), buffer);
|
||||
}
|
||||
else {
|
||||
buffer[0] = Types.STRING;
|
||||
buffer.writeUInt16BE(Buffer.byteLength(obj, "utf-8"), 1);
|
||||
const len = buffer.write(obj, 3);
|
||||
return Buffer.from(buffer, 0, 3 + len);
|
||||
}
|
||||
};
|
||||
};
|
||||
|
||||
decode_list = (buffer: Buffer) => {
|
||||
const arr = [];
|
||||
const size = this.bytesToInt(buffer, 4, true);
|
||||
buffer = Buffer.from(buffer, 4);
|
||||
|
||||
for (let i = 0; i < size; ++i) {
|
||||
const el = this.#decode(buffer);
|
||||
arr.push(el.value);
|
||||
buffer = el.rest;
|
||||
}
|
||||
|
||||
const lastChar = buffer[0];
|
||||
|
||||
if (lastChar !== Types.NIL) {
|
||||
throw new Error("List does not end with NIL");
|
||||
}
|
||||
|
||||
buffer = Buffer.from(buffer, 1);
|
||||
|
||||
return {
|
||||
value: arr,
|
||||
rest: buffer,
|
||||
encode_boolean = (obj: boolean, buffer: Buffer) => {
|
||||
if (obj) {
|
||||
return this.#encode(this.toAtom("true"), buffer);
|
||||
} else {
|
||||
return this.#encode(this.toAtom("false"), buffer);
|
||||
}
|
||||
};
|
||||
};
|
||||
|
||||
decode_map = (buffer: Buffer) => {
|
||||
const map: Record<string, any> = {};
|
||||
const size = this.bytesToInt(buffer, 4, true);
|
||||
encode_number = (obj: number, buffer: Buffer) => {
|
||||
const isInteger = obj % 1 === 0;
|
||||
|
||||
buffer = Buffer.from(buffer, 4);
|
||||
// Handle floats...
|
||||
if (!isInteger) {
|
||||
return this.encode_float(obj, buffer);
|
||||
}
|
||||
|
||||
for (let i = 0; i < size; ++i) {
|
||||
let el = this.#decode(buffer);
|
||||
const key = el.value;
|
||||
el = this.#decode(el.rest);
|
||||
const value = el.value;
|
||||
map[key] = value;
|
||||
buffer = el.rest;
|
||||
}
|
||||
return {
|
||||
value: map,
|
||||
rest: buffer,
|
||||
// Small int...
|
||||
if (isInteger && obj >= 0 && obj < 256) {
|
||||
buffer[0] = Types.SMALL_INTEGER;
|
||||
buffer.writeUInt8(obj, 1);
|
||||
return Buffer.from(buffer, 0, 2);
|
||||
}
|
||||
|
||||
// 4 byte int...
|
||||
if (isInteger && obj >= -134217728 && obj <= 134217727) {
|
||||
buffer[0] = Types.INTEGER;
|
||||
buffer.writeInt32BE(obj, 1);
|
||||
return Buffer.from(buffer, 0, 5);
|
||||
}
|
||||
|
||||
// Bignum...
|
||||
const numBuffer = Buffer.alloc(buffer.length);
|
||||
if (obj < 0) {
|
||||
obj *= -1;
|
||||
numBuffer[0] = 1;
|
||||
} else {
|
||||
numBuffer[0] = 0;
|
||||
}
|
||||
|
||||
let offset = 1;
|
||||
while (obj !== 0) {
|
||||
numBuffer[offset] = obj % 256;
|
||||
obj = Math.floor(obj / 256);
|
||||
offset++;
|
||||
}
|
||||
|
||||
if (offset < 256) {
|
||||
buffer[0] = Types.SMALL_BIG;
|
||||
buffer.writeUInt8(offset - 1, 1);
|
||||
numBuffer.copy(buffer, 2, 0, offset);
|
||||
return Buffer.from(buffer, 0, 2 + offset);
|
||||
} else {
|
||||
buffer[0] = Types.LARGE_BIG;
|
||||
buffer.writeUInt32BE(offset - 1, 1);
|
||||
numBuffer.copy(buffer, 5, 0, offset);
|
||||
return Buffer.from(buffer, 0, 5 + offset);
|
||||
}
|
||||
};
|
||||
};
|
||||
|
||||
decode_tuple = (buffer: Buffer, count: 1 | 2 | 4) => {
|
||||
const arr = [];
|
||||
const size = this.bytesToInt(buffer, count, true);
|
||||
buffer = Buffer.from(buffer, count);
|
||||
for (let i = 0; i < size; ++i) {
|
||||
const el = this.#decode(buffer);
|
||||
arr.push(el.value);
|
||||
buffer = el.rest;
|
||||
}
|
||||
return {
|
||||
value: this.toTuple(arr),
|
||||
rest: buffer,
|
||||
encode_float = (obj: number, buffer: Buffer) => {
|
||||
// float...
|
||||
buffer[0] = Types.NEW_FLOAT;
|
||||
buffer.writeDoubleBE(obj, 1);
|
||||
return Buffer.from(buffer, 0, 9);
|
||||
};
|
||||
};
|
||||
|
||||
decode_nil = (buffer: Buffer) => {
|
||||
// nil is an empty list
|
||||
return {
|
||||
value: [],
|
||||
rest: buffer,
|
||||
encode_object = (obj: any, buffer: Buffer) => {
|
||||
// Check if it's an atom, binary, or tuple...
|
||||
if (obj === null) {
|
||||
const undefinedAtom =
|
||||
this.convention === Lang.ELIXIR ? "nil" : "undefined";
|
||||
return this.#encode(this.toAtom(undefinedAtom), buffer);
|
||||
}
|
||||
|
||||
if (Buffer.isBuffer(obj)) {
|
||||
return this.encode_binary(obj, buffer);
|
||||
}
|
||||
if (Array.isArray(obj)) {
|
||||
return this.encode_array(obj, buffer);
|
||||
}
|
||||
if (obj.type === "Atom") {
|
||||
return this.encode_atom(obj, buffer);
|
||||
}
|
||||
if (obj.type === "Tuple") {
|
||||
return this.encode_tuple(obj, buffer);
|
||||
}
|
||||
// Treat the object as an associative array...
|
||||
return this.encode_map(obj, buffer);
|
||||
};
|
||||
};
|
||||
|
||||
bytesToInt = (buffer: Buffer, length: 1 | 2 | 4, unsigned: boolean) => {
|
||||
switch (length) {
|
||||
case 1:
|
||||
return unsigned ? buffer.readUInt8(0) : buffer.readInt8(0);
|
||||
case 2:
|
||||
return unsigned ? buffer.readUInt16BE(0) : buffer.readInt16BE(0);
|
||||
case 4:
|
||||
return unsigned ? buffer.readUInt32BE(0) : buffer.readInt32BE(0);
|
||||
}
|
||||
};
|
||||
encode_atom = (obj: any, buffer: Buffer) => {
|
||||
buffer[0] = Types.ATOM;
|
||||
buffer.writeUInt16BE(obj.value.length, 1);
|
||||
const len = buffer.write(obj.value, 3);
|
||||
return Buffer.from(buffer, 0, 3 + len);
|
||||
};
|
||||
|
||||
binary_to_list = (str: string) => {
|
||||
const ret = [];
|
||||
for (let i = 0; i < str.length; ++i) ret.push(str[i]);
|
||||
encode_binary = (obj: Buffer, buffer: Buffer) => {
|
||||
buffer[0] = Types.BINARY;
|
||||
buffer.writeUInt32BE(obj.length, 1);
|
||||
const len = obj.copy(buffer, 5);
|
||||
return Buffer.from(buffer, 0, 5 + len);
|
||||
};
|
||||
|
||||
return ret;
|
||||
};
|
||||
encode_undefined = (_obj: Buffer, buffer: Buffer) => {
|
||||
return this.#encode(null, buffer);
|
||||
};
|
||||
|
||||
encode_tuple = (obj: Buffer, buffer: Buffer) => {
|
||||
if (obj.length < 256) {
|
||||
buffer[0] = Types.SMALL_TUPLE;
|
||||
buffer.writeUInt8(obj.length, 1);
|
||||
buffer = Buffer.from(buffer, 0, 2);
|
||||
} else {
|
||||
buffer[0] = Types.LARGE_TUPLE;
|
||||
buffer.writeUInt32BE(obj.length, 1);
|
||||
buffer = Buffer.from(buffer, 0, 5);
|
||||
}
|
||||
|
||||
for (let i = 0; i < obj.length; ++i) {
|
||||
buffer = this.#encode(obj[i], buffer);
|
||||
}
|
||||
|
||||
return buffer;
|
||||
};
|
||||
|
||||
encode_array = (obj: any[], buffer: Buffer) => {
|
||||
if (obj.length === 0) {
|
||||
buffer[0] = Types.NIL;
|
||||
return Buffer.from(buffer, 0, 1);
|
||||
}
|
||||
|
||||
buffer[0] = Types.LIST;
|
||||
buffer.writeUInt32BE(obj.length, 1);
|
||||
buffer = Buffer.from(buffer, 0, 5);
|
||||
|
||||
for (let i = 0; i < obj.length; ++i) {
|
||||
buffer = this.#encode(obj[i], buffer);
|
||||
}
|
||||
buffer[0] = Types.NIL;
|
||||
return Buffer.from(buffer, 0, 1);
|
||||
};
|
||||
|
||||
encode_map = (obj: Record<string, any>, buffer: Buffer) => {
|
||||
const keys = Object.keys(obj);
|
||||
buffer[0] = Types.MAP;
|
||||
buffer.writeUInt32BE(keys.length, 1);
|
||||
buffer = Buffer.from(buffer, 0, 5);
|
||||
|
||||
for (let i = 0; i < keys.length; ++i) {
|
||||
const key = this.mapKeyAsAtom ? this.toAtom(keys[i]) : keys[i];
|
||||
buffer = this.#encode(key, buffer);
|
||||
buffer = this.#encode(obj[keys[i]], buffer);
|
||||
}
|
||||
return buffer;
|
||||
};
|
||||
|
||||
decode_atom = (buffer: Buffer, count: 1 | 2 | 4) => {
|
||||
const size = this.bytesToInt(buffer, count, true);
|
||||
buffer = Buffer.from(buffer, count);
|
||||
let value: any = buffer.toString("utf8", 0, size);
|
||||
if (value === "true") {
|
||||
value = true;
|
||||
} else if (value === "false") {
|
||||
value = false;
|
||||
} else if (
|
||||
this.decodeUndefinedValues &&
|
||||
this.convention === Lang.ELIXIR &&
|
||||
value === "nil"
|
||||
) {
|
||||
value = null;
|
||||
} else if (
|
||||
this.decodeUndefinedValues &&
|
||||
this.convention === Lang.ERLANG &&
|
||||
value === "undefined"
|
||||
) {
|
||||
value = null;
|
||||
} else {
|
||||
value = this.toAtom(value);
|
||||
}
|
||||
return {
|
||||
value,
|
||||
rest: Buffer.from(buffer, size),
|
||||
};
|
||||
};
|
||||
|
||||
decode_binary = (buffer: Buffer) => {
|
||||
const size = this.bytesToInt(buffer, 4, true);
|
||||
buffer = Buffer.from(buffer, 4);
|
||||
const bin = Buffer.alloc(size);
|
||||
buffer.copy(bin, 0, 0, size);
|
||||
return {
|
||||
value:
|
||||
this.convention === Lang.ELIXIR && this.allBinariesAsString
|
||||
? bin.toString()
|
||||
: bin,
|
||||
rest: Buffer.from(buffer, size),
|
||||
};
|
||||
};
|
||||
|
||||
decode_integer = (buffer: Buffer, count: 1 | 2 | 4, unsigned = false) => {
|
||||
return {
|
||||
value: this.bytesToInt(buffer, count, unsigned),
|
||||
rest: Buffer.from(buffer, count),
|
||||
};
|
||||
};
|
||||
|
||||
decode_big = (buffer: Buffer, count: 1 | 2 | 4) => {
|
||||
const size = this.bytesToInt(buffer, count, false);
|
||||
buffer = Buffer.from(buffer, count);
|
||||
|
||||
let num = 0;
|
||||
const isNegative = buffer[0] === 1;
|
||||
|
||||
buffer = Buffer.from(buffer, 1);
|
||||
|
||||
for (let i = size - 1; i >= 0; --i) {
|
||||
const n = buffer[i];
|
||||
if (num === 0) {
|
||||
num = n;
|
||||
} else {
|
||||
num = num * 256 + n;
|
||||
}
|
||||
}
|
||||
if (isNegative) {
|
||||
num = num * -1;
|
||||
}
|
||||
|
||||
return {
|
||||
value: num,
|
||||
rest: Buffer.from(buffer, size),
|
||||
};
|
||||
};
|
||||
|
||||
decode_float = (buffer: Buffer) => {
|
||||
const size = 31;
|
||||
|
||||
return {
|
||||
value: parseFloat(buffer.toString("utf8", 0, size)),
|
||||
rest: Buffer.from(buffer, size),
|
||||
};
|
||||
};
|
||||
|
||||
decode_new_float = (buffer: Buffer) => {
|
||||
return {
|
||||
value: buffer.readDoubleBE(0),
|
||||
rest: Buffer.from(buffer, 8),
|
||||
};
|
||||
};
|
||||
|
||||
decode_string = (buffer: Buffer) => {
|
||||
const size = this.bytesToInt(buffer, 2, true);
|
||||
|
||||
buffer = Buffer.from(buffer, 2);
|
||||
|
||||
return {
|
||||
value: buffer.toString("utf8", 0, size),
|
||||
rest: Buffer.from(buffer, size),
|
||||
};
|
||||
};
|
||||
|
||||
decode_list = (buffer: Buffer) => {
|
||||
const arr = [];
|
||||
const size = this.bytesToInt(buffer, 4, true);
|
||||
buffer = Buffer.from(buffer, 4);
|
||||
|
||||
for (let i = 0; i < size; ++i) {
|
||||
const el = this.#decode(buffer);
|
||||
arr.push(el.value);
|
||||
buffer = el.rest;
|
||||
}
|
||||
|
||||
const lastChar = buffer[0];
|
||||
|
||||
if (lastChar !== Types.NIL) {
|
||||
throw new Error("List does not end with NIL");
|
||||
}
|
||||
|
||||
buffer = Buffer.from(buffer, 1);
|
||||
|
||||
return {
|
||||
value: arr,
|
||||
rest: buffer,
|
||||
};
|
||||
};
|
||||
|
||||
decode_map = (buffer: Buffer) => {
|
||||
const map: Record<string, any> = {};
|
||||
const size = this.bytesToInt(buffer, 4, true);
|
||||
|
||||
buffer = Buffer.from(buffer, 4);
|
||||
|
||||
for (let i = 0; i < size; ++i) {
|
||||
let el = this.#decode(buffer);
|
||||
const key = el.value;
|
||||
el = this.#decode(el.rest);
|
||||
const value = el.value;
|
||||
map[key] = value;
|
||||
buffer = el.rest;
|
||||
}
|
||||
return {
|
||||
value: map,
|
||||
rest: buffer,
|
||||
};
|
||||
};
|
||||
|
||||
decode_tuple = (buffer: Buffer, count: 1 | 2 | 4) => {
|
||||
const arr = [];
|
||||
const size = this.bytesToInt(buffer, count, true);
|
||||
buffer = Buffer.from(buffer, count);
|
||||
for (let i = 0; i < size; ++i) {
|
||||
const el = this.#decode(buffer);
|
||||
arr.push(el.value);
|
||||
buffer = el.rest;
|
||||
}
|
||||
return {
|
||||
value: this.toTuple(arr),
|
||||
rest: buffer,
|
||||
};
|
||||
};
|
||||
|
||||
decode_nil = (buffer: Buffer) => {
|
||||
// nil is an empty list
|
||||
return {
|
||||
value: [],
|
||||
rest: buffer,
|
||||
};
|
||||
};
|
||||
|
||||
bytesToInt = (buffer: Buffer, length: 1 | 2 | 4, unsigned: boolean) => {
|
||||
switch (length) {
|
||||
case 1:
|
||||
return unsigned ? buffer.readUInt8(0) : buffer.readInt8(0);
|
||||
case 2:
|
||||
return unsigned ? buffer.readUInt16BE(0) : buffer.readInt16BE(0);
|
||||
case 4:
|
||||
return unsigned ? buffer.readUInt32BE(0) : buffer.readInt32BE(0);
|
||||
}
|
||||
};
|
||||
|
||||
binary_to_list = (str: string) => {
|
||||
const ret = [];
|
||||
for (let i = 0; i < str.length; ++i) ret.push(str[i]);
|
||||
|
||||
return ret;
|
||||
};
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -486,9 +489,9 @@ export class Bert {
|
|||
*
|
||||
*/
|
||||
export const toAtom = (str: string) => ({
|
||||
type: "Atom",
|
||||
value: str,
|
||||
toString: () => str,
|
||||
type: "Atom",
|
||||
value: str,
|
||||
toString: () => str,
|
||||
});
|
||||
|
||||
/**
|
||||
|
|
@ -496,15 +499,15 @@ export const toAtom = (str: string) => ({
|
|||
*
|
||||
*/
|
||||
export const toTuple = (arr: any[]) => ({
|
||||
...arr,
|
||||
type: "Tuple",
|
||||
length: arr.length,
|
||||
value: arr,
|
||||
toString: () =>
|
||||
"{" +
|
||||
arr
|
||||
.filter((i) => i !== "")
|
||||
.map((i) => i.toString())
|
||||
.join(", ") +
|
||||
"}",
|
||||
...arr,
|
||||
type: "Tuple",
|
||||
length: arr.length,
|
||||
value: arr,
|
||||
toString: () =>
|
||||
"{" +
|
||||
arr
|
||||
.filter((i) => i !== "")
|
||||
.map((i) => i.toString())
|
||||
.join(", ") +
|
||||
"}",
|
||||
});
|
||||
|
|
|
|||
Loading…
Reference in New Issue