const MAX_SHORT_STRING = require('./wasm-hash').MAX_SHORT_STRING;
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class BatchedHash {
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constructor(hash) {
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this.string = undefined;
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this.encoding = undefined;
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this.hash = hash;
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}
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/**
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* Update hash {@link https://nodejs.org/api/crypto.html#crypto_hash_update_data_inputencoding}
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* @param {string|Buffer} data data
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* @param {string=} inputEncoding data encoding
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* @returns {this} updated hash
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*/
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update(data, inputEncoding) {
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if (this.string !== undefined) {
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if (
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typeof data === 'string' &&
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inputEncoding === this.encoding &&
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this.string.length + data.length < MAX_SHORT_STRING
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) {
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this.string += data;
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return this;
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}
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this.hash.update(this.string, this.encoding);
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this.string = undefined;
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}
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if (typeof data === 'string') {
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if (
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data.length < MAX_SHORT_STRING &&
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// base64 encoding is not valid since it may contain padding chars
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(!inputEncoding || !inputEncoding.startsWith('ba'))
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) {
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this.string = data;
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this.encoding = inputEncoding;
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} else {
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this.hash.update(data, inputEncoding);
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}
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} else {
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this.hash.update(data);
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}
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return this;
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}
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/**
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* Calculates the digest {@link https://nodejs.org/api/crypto.html#crypto_hash_digest_encoding}
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* @param {string=} encoding encoding of the return value
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* @returns {string|Buffer} digest
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*/
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digest(encoding) {
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if (this.string !== undefined) {
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this.hash.update(this.string, this.encoding);
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}
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return this.hash.digest(encoding);
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}
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}
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module.exports = BatchedHash;
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