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+# Sumchecker
+
+[![Travis CI](https://travis-ci.org/malept/sumchecker.svg?branch=master)](https://travis-ci.org/malept/sumchecker)
+[![AppVeyor CI](https://ci.appveyor.com/api/projects/status/wm4n2r11nlff8ify?svg=true)](https://ci.appveyor.com/project/malept/sumchecker)
+[![Code Climate](https://codeclimate.com/github/malept/sumchecker/badges/gpa.svg)](https://codeclimate.com/github/malept/sumchecker)
+[![Test Coverage](https://codeclimate.com/github/malept/sumchecker/badges/coverage.svg)](https://codeclimate.com/github/malept/sumchecker/coverage)
+
+Sumchecker is a pure Node.js solution to validating files specified in a checksum file, which are
+usually generated by programs such as [`sha256sum`](https://en.wikipedia.org/wiki/Sha256sum).
+
+## Usage
+
+```javascript
+sumchecker(algorithm, checksumFilename, baseDir, filesToCheck)
+  .then(() => {
+    console.log('All files validate!');
+  }, (error) => {
+    console.error('An error occurred', error);
+  });
+```
+
+Returns a [`Promise`](https://www.promisejs.org/). The promise is resolved when all files specified
+in [`filesToCheck`](#filesToCheck) are validated. The promise is rejected otherwise.
+
+### Parameters
+
+#### `algorithm`
+
+`String` - The hash algorithm used in [`checksumFilename`](#checksumFilename). Corresponds to the
+algorithms allowed by [`crypto.createHash()`].
+
+#### `checksumFilename`
+
+`String` - The path to the checksum file.
+
+#### `baseDir`
+
+`String` - The base directory for the files specified in [`filesToCheck`](#filesToCheck).
+
+#### `filesToCheck`
+
+`Array` or `String` - one or more paths of the files that will be validated, relative to
+[`baseDir`](#baseDir).
+
+### Errors
+
+These are `sumchecker`-specific error classes that are passed to the promise's reject callback.
+
+#### `sumchecker.ChecksumMismatchError`
+
+When at least one of the files does not match its expected checksum.
+
+Properties:
+
+* `filename` (`String`) - a path to a file that did not match
+
+#### `sumchecker.ChecksumParseError`
+
+When the checksum file cannot be parsed (as in, it does not match the checksum file format).
+
+Properties:
+
+* `lineNumber` (`Number`) - the line number that could not be parsed
+* `line` (`String`) - the raw line data that could not be parsed, sans newline
+
+#### `sumchecker.NoChecksumFoundError`
+
+When at least one of the files specified to check is not listed in the checksum file.
+
+Properties:
+
+* `filename` (`String`)- a filename from [`filesToCheck`](#filesToCheck)
+
+## Legal
+
+This library is copyrighted under the terms of the [Apache 2.0 License].
+
+[`crypto.createHash()`]: https://nodejs.org/dist/latest-v4.x/docs/api/crypto.html#crypto_crypto_createhash_algorithm
+[`Promise.all`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/all
+[Apache 2.0 License]: http://www.apache.org/licenses/LICENSE-2.0