@azure/cosmos/dist-esm/src/utils/hashing/encoding/string.js

Microsoft Azure Cosmos DB Service Node.js SDK for SQL API

// Copyright (c) Microsoft Corporation.
// Licensed under the MIT license.
import { BytePrefix } from "./prefix";
export function writeStringForBinaryEncoding(payload) {
    let outputStream = Buffer.from(BytePrefix.String, "hex");
    const MAX_STRING_BYTES_TO_APPEND = 100;
    const byteArray = [...Buffer.from(payload)];
    const isShortString = payload.length <= MAX_STRING_BYTES_TO_APPEND;
    for (let index = 0; index < (isShortString ? byteArray.length : MAX_STRING_BYTES_TO_APPEND + 1); index++) {
        let charByte = byteArray[index];
        if (charByte < 0xff) {
            charByte++;
        }
        outputStream = Buffer.concat([outputStream, Buffer.from(charByte.toString(16), "hex")]);
    }
    if (isShortString) {
        outputStream = Buffer.concat([outputStream, Buffer.from(BytePrefix.Undefined, "hex")]);
    }
    return outputStream;
}
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