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Comparing version 0.0.2 to 1.0.0

6

History.md
1.0.0 / 2018-06-28
==================
**others**
* [[`e07ae1b`](http://github.com/node-modules/buffer-type/commit/e07ae1bf830afd369e892e8abeb722c75ccbaf80)] - * feat: support Exif - Exchange Image File Format image (fengmk2 <<fengmk2@gmail.com>>)
0.0.2 / 2014-05-04

@@ -3,0 +9,0 @@ ==================

167

lib/buffer-type.js

@@ -1,18 +0,4 @@

/**!
* buffer-type - lib/buffer-type.js
*
* Copyright(c) fengmk2 and other contributors.
* MIT Licensed
*
* Authors:
* fengmk2 <fengmk2@gmail.com> (http://fengmk2.github.com)
*/
'use strict';
/**
* Module dependencies.
*/
/**
* @see http://www.onicos.com/staff/iz/formats/gif.html

@@ -41,3 +27,4 @@ *

*/
var gif = function (buf) {
function gif(buf) {
if (buf.length < 13 ||

@@ -50,11 +37,11 @@ // "GIF" 0x47 0x49 0x46

}
var width = buf.readUInt16LE(6);
var height = buf.readUInt16LE(8);
const width = buf.readUInt16LE(6);
const height = buf.readUInt16LE(8);
return {
type: 'image/gif',
extension: '.gif',
width: width,
height: height
width,
height,
};
};
}

@@ -73,3 +60,4 @@ /**

*/
var png = function (buf) {
function png(buf) {
if (buf.length < 16 ||

@@ -86,6 +74,6 @@ buf[0] !== 0x89 ||

// 4 bytes 4 bytes Length bytes 4 bytes
var length = buf.readUInt32BE(8);
const length = buf.readUInt32BE(8);
// var chunkType = buf.slice(12, 16).toString(); // should be 'IHDR'
// console.log(length, chunkType, buf.slice(12, 16))
var chunkData = buf.slice(16, 16 + length);
const chunkData = buf.slice(16, 16 + length);
// Width: 4 bytes 0

@@ -98,9 +86,9 @@ // Height: 4 bytes 4

// Interlace method: 1 byte 12
var width = chunkData.readUInt32BE(0, true);
var height = chunkData.readUInt32BE(4, true);
const width = chunkData.readUInt32BE(0, true);
const height = chunkData.readUInt32BE(4, true);
return {
type: 'image/png',
extension: '.png',
width: width,
height: height,
width,
height,
bit: chunkData.readUInt8(8, true),

@@ -112,3 +100,3 @@ color: chunkData.readUInt8(9, true),

};
};
}

@@ -147,3 +135,4 @@ /**

var jpeg = function (buf) {
function jpeg(buf) {
// JFIF - JPEG FILE Interchange Format
if (buf.length < 20 ||

@@ -163,5 +152,6 @@ // 0xff 0xd8(SOI)

}
// APP0
var majorVersion = buf.readUInt8(11, true);
var minorVersion = buf.readUInt8(12, true);
// const majorVersion = buf.readUInt8(11, true);
// const minorVersion = buf.readUInt8(12, true);
// var units = buf.readUInt8(13, true);

@@ -206,7 +196,7 @@ // var width = buf.readUInt16BE(14, true);

// find SOF0
var offset = 20;
var sof0 = null;
let offset = 20;
let sof0 = null;
while (offset < buf.length) {
var flag = buf.slice(offset, offset + 2);
var size = buf.readUInt16BE(offset + 2);
const flag = buf.slice(offset, offset + 2);
const size = buf.readUInt16BE(offset + 2);
if (flag[0] === 0xff && flag[1] === 0xc0) {

@@ -219,3 +209,3 @@ sof0 = offset;

var r = {
const r = {
type: 'image/jpeg',

@@ -233,4 +223,82 @@ extension: '.jpg',

return r;
};
}
// Exif - Exchange Image File Format
// 这个标准是 Camera 产业联合会发布的,主要目的就是设计一种文件格式,方便交换照片文件的 metadata
// https://blog.csdn.net/kickxxx/article/details/8173332
// Exif文件的layout
//
// SOI 0xFF, 0xD8 Start of frame
// APP1 0xFF, 0xE1 Exif Attribute Information
// APP2 0xFF, 0xE2 Flashpix Externsion data
// ...
// APPz 0xFF, 0xEn
// DQT 0xFF, 0xDB
// DHT 0xFF, 0xC4
// DRI 0xFF, 0xDD
// SOF 0xFF, 0xC0(0xFF, 0xC2)
// SOS 0xFF, 0xDA
// Compressed Data
// EOI 0xFF, 0xD9
function jpegExif(buf) {
if (buf.length < 4 ||
// 0xff 0xd8(SOI)
buf[0] !== 0xff || buf[1] !== 0xd8 ||
// 0xff 0xe0(APP1)
buf[2] !== 0xff || buf[3] !== 0xe1) {
return;
}
// APPn 应用程序保留标记
// 标记代码 marker 2 bytes 固定值0xFFE1 ~ 0xFFEF, n=1~15
// 数据长度 length 2 bytes APPn的总长度,不包括marker的2bytes
// 详细信息 (length - 2) bytes 内容是应用特定的,比如Exif使用APP1来存放图片的metadata,Adobe Photoshop用APP1和APP13两个标记段分别存储了一副图像的副本。
// find SOF0
let offset = 2;
let sof0 = null;
while (offset < buf.length) {
const flag = buf.slice(offset, offset + 2);
const size = buf.readUInt16BE(offset + 2);
if (flag[0] === 0xff && flag[1] === 0xc0) {
sof0 = offset;
break;
}
offset += 2 + size;
}
// SOF0,Start of Frame,帧图像开始
// u 标记代码 2字节 固定值0xFFC0
// u 包含9个具体字段:
// ① 数据长度 2字节 ①~⑥六个字段的总长度
// 即不包括标记代码,但包括本字段
// ② 精度 1字节 每个数据样本的位数
// 通常是8位,一般软件都不支持 12位和16位
// ③ 图像高度 2字节 图像高度(单位:像素),如果不支持 DNL 就必须 >0
// ④ 图像宽度 2字节 图像宽度(单位:像素),如果不支持 DNL 就必须 >0
// ⑤ 颜色分量数 1字节 只有3个数值可选
// 1:灰度图;3:YCrCb或YIQ;4:CMYK
// 而JFIF中使用YCrCb,故这里颜色分量数恒为3
// ⑥颜色分量信息 颜色分量数×3字节(通常为9字节)
// a) 颜色分量ID 1字节
// b) 水平/垂直采样因子 1字节 高4位:水平采样因子
// 低4位:垂直采样因子
// (曾经看到某资料把这两者调转了)
// c) 量化表 1字节 当前分量使用的量化表的ID
// 本标记段中,字段⑥应该重复出现,有多少个颜色分量(字段⑤),就出现多少次(一般为3次)。
const r = {
type: 'image/jpeg',
extension: '.jpg',
};
if (sof0) {
// If found out SOF0, we can detect width and height
offset = sof0 + 2 + 2 + 1;
r.height = buf.readUInt16BE(offset, true);
r.width = buf.readUInt16BE(offset + 2, true);
}
return r;
}
/**

@@ -275,3 +343,3 @@ * @see http://www.onicos.com/staff/iz/formats/bmp.html

var bmp = function (buf) {
function bmp(buf) {
if (buf.length < 36 ||

@@ -281,5 +349,6 @@ buf[0] !== 0x42 || buf[1] !== 0x4d) {

}
var headerSize = buf.readUInt32LE(14, true);
var header = buf.slice(18, 18 + headerSize - 4);
var width, height;
const headerSize = buf.readUInt32LE(14, true);
const header = buf.slice(18, 18 + headerSize - 4);
let width,
height;
if (headerSize === 12) {

@@ -295,6 +364,6 @@ width = header.readUInt16LE(0, true);

extension: '.bmp',
width: width,
height: height
width,
height,
};
};
}

@@ -331,3 +400,3 @@ // webp format: https://developers.google.com/speed/webp/docs/riff_container

// The file size in the header is the total size of the chunks that follow plus 4 bytes for the 'WEBP' FourCC.
var size = buf.readUInt32LE(4);
const size = buf.readUInt32LE(4);

@@ -337,7 +406,7 @@ return {

extension: '.webp',
size: size + 8
size: size + 8,
};
}
var types = [gif, png, jpeg, bmp, webp];
const types = [ gif, png, jpeg, jpegExif, bmp, webp ];

@@ -349,4 +418,4 @@ function detect(buf) {

for (var i = 0; i < types.length; i++) {
var r = types[i](buf);
for (let i = 0; i < types.length; i++) {
const r = types[i](buf);
if (r) {

@@ -353,0 +422,0 @@ return r;

This software is licensed under the MIT License.
Copyright (C) 2013 fengmk2 <fengmk2@gmail.com>
Copyright(c) 2013 fengmk2 <fengmk2@gmail.com>
Copyright(c) 2013 - present node-modules and other contributors.

@@ -5,0 +6,0 @@ Permission is hereby granted, free of charge, to any person obtaining a copy

{
"name": "buffer-type",
"version": "0.0.2",
"version": "1.0.0",
"description": "Detect content-type from Buffer data.",
"main": "index.js",
"main": "lib/buffer-type.js",
"files": [
"lib"
],
"scripts": {
"test": "make test-all"
"lint": "eslint lib test",
"test-local": "egg-bin test",
"test": "npm run lint && npm run test-local",
"ci": "npm run lint && egg-bin cov"
},
"config": {
"blanket": {
"pattern": "buffer-type/lib",
"data-cover-flags": {
"debug": false
}
},
"travis-cov": {
"threshold": 100
}
},
"dependencies": {
},
"dependencies": {},
"devDependencies": {
"should": "*",
"blanket": "*",
"travis-cov": "*",
"coveralls": "*",
"mocha-lcov-reporter": "*",
"mime": "*",
"mocha": "*"
"egg-bin": "^4.7.0",
"egg-ci": "^1.8.0",
"eslint": "^5.0.1",
"eslint-config-egg": "^7.0.0",
"mime": "1"
},

@@ -35,4 +26,3 @@ "homepage": "https://github.com/node-modules/buffer-type",

"type": "git",
"url": "git://github.com/node-modules/buffer-type.git",
"web": "https://github.com/node-modules/buffer-type"
"url": "git://github.com/node-modules/buffer-type.git"
},

@@ -42,11 +32,18 @@ "keywords": [

"image-type",
"content-type", "buffer", "type",
"content-type",
"buffer",
"type",
"mime",
"filetype", "file extension", "buffer type"
"filetype",
"file extension",
"buffer type"
],
"engines": {
"node": ">= 0.8.0"
"node": ">= 8.0.0"
},
"ci": {
"version": "8, 10"
},
"author": "fengmk2 <fengmk2@gmail.com>",
"license": "MIT"
}
buffer-type
=======
[![Build Status](https://secure.travis-ci.org/node-modules/buffer-type.png)](http://travis-ci.org/node-modules/buffer-type)
[![NPM version][npm-image]][npm-url]
[![NPM quality][quality-image]][quality-url]
[![build status][travis-image]][travis-url]
[![Test coverage][codecov-image]][codecov-url]
[![David deps][david-image]][david-url]
[![Known Vulnerabilities][snyk-image]][snyk-url]
[![NPM download][download-image]][download-url]
[![Coverage Status](https://coveralls.io/repos/node-modules/buffer-type/badge.png)](https://coveralls.io/r/node-modules/buffer-type)
[npm-image]: https://img.shields.io/npm/v/buffer-type.svg?style=flat-square
[npm-url]: https://npmjs.org/package/buffer-type
[quality-image]: http://npm.packagequality.com/shield/buffer-type.svg?style=flat-square
[quality-url]: http://packagequality.com/#?package=buffer-type
[travis-image]: https://img.shields.io/travis/node-modules/buffer-type.svg?style=flat-square
[travis-url]: https://travis-ci.org/node-modules/buffer-type
[codecov-image]: https://img.shields.io/codecov/c/github/node-modules/buffer-type.svg?style=flat-square
[codecov-url]: https://codecov.io/gh/node-modules/buffer-type
[david-image]: https://img.shields.io/david/node-modules/buffer-type.svg?style=flat-square
[david-url]: https://david-dm.org/node-modules/buffer-type
[snyk-image]: https://snyk.io/test/npm/buffer-type/badge.svg?style=flat-square
[snyk-url]: https://snyk.io/test/npm/buffer-type
[download-image]: https://img.shields.io/npm/dm/buffer-type.svg?style=flat-square
[download-url]: https://npmjs.org/package/buffer-type
[![NPM](https://nodei.co/npm/buffer-type.png?downloads=true&stars=true)](https://nodei.co/npm/buffer-type/)
![logo](https://raw.github.com/node-modules/buffer-type/master/logo.png)
Detect content-type from Buffer data.

@@ -23,6 +38,6 @@

```js
var bt = require('buffer-type');
var fs = require('fs');
const bt = require('buffer-type');
const fs = require('fs');
var info = bt(fs.readFileSync(__dirname + '/logo.png'));
const info = bt(fs.readFileSync(__dirname + '/logo.png'));
console.log(info);

@@ -79,39 +94,4 @@ // {

## Authors
```bash
$ git summary
project : buffer-type
repo age : 8 hours
active : 2 days
commits : 5
files : 17
authors :
5 fengmk2 100.0%
```
## License
(The MIT License)
Copyright (c) 2013 fengmk2 &lt;fengmk2@gmail.com&gt;
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
'Software'), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
[MIT](LICENSE.txt)
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