08-27-周三_17-09-29

node_modules/hasha/index.js

@@ -0,0 +1,70 @@
+'use strict';
+var fs = require('fs');
+var crypto = require('crypto');
+var isStream = require('is-stream');
+var Promise = require('pinkie-promise');
+
+var hasha = module.exports = function (input, opts) {
+	opts = opts || {};
+
+	var outputEncoding = opts.encoding || 'hex';
+
+	if (outputEncoding === 'buffer') {
+		outputEncoding = undefined;
+	}
+
+	var hash = crypto.createHash(opts.algorithm || 'sha512');
+
+	var update = function (buf) {
+		var inputEncoding = typeof buf === 'string' ? 'utf8' : undefined;
+		hash.update(buf, inputEncoding);
+	};
+
+	if (Array.isArray(input)) {
+		input.forEach(update);
+	} else {
+		update(input);
+	}
+
+	return hash.digest(outputEncoding);
+};
+
+hasha.stream = function (opts) {
+	opts = opts || {};
+
+	var outputEncoding = opts.encoding || 'hex';
+
+	if (outputEncoding === 'buffer') {
+		outputEncoding = undefined;
+	}
+
+	var stream = crypto.createHash(opts.algorithm || 'sha512');
+	stream.setEncoding(outputEncoding);
+	return stream;
+};
+
+hasha.fromStream = function (stream, opts) {
+	if (!isStream(stream)) {
+		return Promise.reject(new TypeError('Expected a stream'));
+	}
+
+	opts = opts || {};
+
+	return new Promise(function (resolve, reject) {
+		stream
+			.on('error', reject)
+			.pipe(hasha.stream(opts))
+			.on('error', reject)
+			.on('finish', function () {
+				resolve(this.read());
+			});
+	});
+};
+
+hasha.fromFile = function (fp, opts) {
+	return hasha.fromStream(fs.createReadStream(fp), opts);
+};
+
+hasha.fromFileSync = function (fp, opts) {
+	return hasha(fs.readFileSync(fp), opts);
+};