aws-crt
Version:
NodeJS/browser bindings to the aws-c-* libraries
73 lines • 2.72 kB
JavaScript
;
/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.unmarshalInt64BigintFromBuffer = exports.marshalInt64BigintAsBuffer = exports.MIN_INT64 = exports.MAX_INT64 = exports.MIN_INT32 = exports.MAX_INT32 = exports.MIN_INT16 = exports.MAX_INT16 = exports.MIN_INT8 = exports.MAX_INT8 = void 0;
const error_1 = require("./error");
/*
* Limits for header value validation
*/
exports.MAX_INT8 = 127;
exports.MIN_INT8 = -128;
exports.MAX_INT16 = 32767;
exports.MIN_INT16 = -32768;
exports.MAX_INT32 = 2147483647;
exports.MIN_INT32 = -2147483648;
exports.MAX_INT64 = BigInt("9223372036854775807");
exports.MIN_INT64 = BigInt("-9223372036854775808");
const MAX_UINT8_AS_BIGINT = BigInt("256");
/** @internal */
function marshalInt64BigintAsBuffer(value) {
if (value < exports.MIN_INT64 || value > exports.MAX_INT64) {
throw new error_1.CrtError("marshalInt64BigintAsBuffer expects a value that can fit in 8 bytes");
}
let buffer = new Uint8Array(8);
/* encode the integer as a twos-complement byte sequence */
if (value < 0) {
value = -value - BigInt(1);
for (let i = 0; i < 8; ++i) {
buffer[i] = 255 - Number(value % MAX_UINT8_AS_BIGINT);
value /= MAX_UINT8_AS_BIGINT;
}
}
else {
for (let i = 0; i < 8; ++i) {
buffer[i] = Number(value % MAX_UINT8_AS_BIGINT);
value /= MAX_UINT8_AS_BIGINT;
}
}
return buffer;
}
exports.marshalInt64BigintAsBuffer = marshalInt64BigintAsBuffer;
/** @internal */
function unmarshalInt64BigintFromBuffer(buffer) {
let value = BigInt(0);
let byteView = new Uint8Array(buffer);
if (byteView.length != 8) {
throw new error_1.CrtError("unmarshalInt64BigintFromBuffer expects a byte buffer of length 8");
}
let shift = BigInt(1);
let isNegative = (byteView[7] & 0x80) != 0;
/* encoding is two's-complement, so treat negative and non-negative differently */
if (isNegative) {
for (let i = 0; i < byteView.length; ++i) {
let byteValue = BigInt(255 - byteView[i]);
value += (byteValue * shift);
shift *= MAX_UINT8_AS_BIGINT;
}
value += BigInt(1);
value = -value;
}
else {
for (let i = 0; i < byteView.length; ++i) {
let byteValue = BigInt(byteView[i]);
value += (byteValue * shift);
shift *= MAX_UINT8_AS_BIGINT;
}
}
return value;
}
exports.unmarshalInt64BigintFromBuffer = unmarshalInt64BigintFromBuffer;
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