FF总是标识一个“标记”—因为我目前正在写一个javascript文件标识符,所以我将尝试用我的javascript对象来回答jpeg…
基本答案已经给出(被接受的答案),但这是关于如何检查不同的应用程序标记的更详细的信息(带有回退)。顺便说一句:
到目前为止,JFIF、exif、adobe、canon和三星都有专门的应用程序(但我们不知道未来)。所以JS对象的逻辑是:
如果有一个规格[x].regex匹配,它将获胜(第一个赢得)。但是如果没有匹配的对象,则父对象(只有ffd8)获胜。
specs对象提供
根据Pronom标识符
-你可以这样看它们
’
http://apps.nationalarchives.gov.uk/pronom/fmt/
'.concat(puid)【官方】
’
http://apps.nationalarchives.gov.uk/pronom/x-fmt/
'concat(xpuid)【实验】
_FFD8: {
SPECS: [
{
PUID: 112,
regex: /^FFD8FFE8(.{2})53504946460001/,
desc: 'jpeg: Still Picture Interchange Format file (SPIF)',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
version: '1.00'
}
},
{
PUID: 44,
regex: /^FFD8FFE0(.{2})4A464946000102/,
desc: 'jpeg: JPEG File Interchange Format file (JFIF), v. 1.02',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
version: '1.02',
}
},
{
PUID: 43,
regex: /^FFD8FFE0(.{2})4A464946000101/,
desc: 'jpeg: JPEG File Interchange Format file (JFIF), v. 1.01',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
version: '1.01',
}
},
{
PUID: 42,
regex: /^FFD8FFE0(.{2})4A464946000100/,
desc: 'jpeg: JPEG File Interchange Format file (JFIF), v. 1.00',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
version: '1.00',
}
},
{
PUID: 41,
xPUID: 398,
regex: /^FFD8FFE1(.{2})45786966000049492A00(.+)009007000400000030323030/,
desc: 'jpeg: JPG Image File, using Exchangeable Image File Format (Exif), little endian, v. 2.0',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
endian: 'little',
version: '2.0',
}
},
{
PUID: 41,
xPUID: 398,
regex: /^FFD8FFE1(.{2})4578696600004D4D002A(.+)900000070000000430323030/,
desc: 'jpeg: JPG Image File, using Exchangeable Image File Format (Exif), big endian, v. 2.0',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
endian: 'big',
version: '2.0',
}
},
{
PUID: 41,
xPUID: 390,
regex: /^FFD8FFE1(.{2})45786966000049492A00(.+)009007000400000030323130/,
desc: 'jpeg: JPG Image File, using Exchangeable Image File Format (Exif), little endian, v. 2.1',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
endian: 'little',
version: '2.1',
}
},
{
PUID: 41,
xPUID: 390,
regex: /^FFD8FFE1(.{2})4578696600004D4D002A(.+)900000070000000430323130/,
desc: 'jpeg: JPG Image File, using Exchangeable Image File Format (Exif), big endian, v. 2.1',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
endian: 'big',
version: '2.1',
}
},
{
PUID: 41,
xPUID: 391,
regex: /^FFD8FFE1(.{2})45786966000049492A00(.+)009007000400000030323230/,
desc: 'jpeg: JPG Image File, using Exchangeable Image File Format (Exif), little endian, v. 2.2',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
endian: 'little',
version: '2.2',
}
},
{
PUID: 41,
xPUID: 391,
regex: /^FFD8FFE1(.{2})4578696600004D4D002A(.+)900000070000000430323230/,
desc: 'jpeg: JPG Image File, using Exchangeable Image File Format (Exif), big endian, v. 2.2',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
endian: 'big',
version: '2.2',
}
},
// specific JPEG (all begin with FFD8FF, map them to PUID 41)
{
PUID: 41,
regex: /^FFD8FFED/,
desc: 'jpeg: JPG Image File, Adobe JPEG, Photoshop CMYK buffer'
},
{
PUID: 41,
regex: /^FFD8FFE2/,
desc: 'jpeg: JPG Image File, Canon JPEG, Canon EOS-1D'
},
{
PUID: 41,
regex: /^FFD8FFE3/,
desc: 'jpeg: JPG Image File, Samsung JPEG, e.g. Samsung D500'
},
{
PUID: 41,
regex: /^FFD8FFDB/,
desc: 'jpeg: JPG Image File, Samsung JPEG, e.g. Samsung D807'
}
],
ext: ['JPG', 'JPE', 'JPEG', 'SPF', 'SPIFF'],
signature: [ 255, 216 ],
desc: 'jpeg: JPEG File Interchange Format file, App0 marker not known',
mime: 'image/jpeg',
specifications: [
{ text:'Specification for the JFIF file format', href:'http://www.w3.org/Graphics/JPEG/jfif3.pdf', type:'W3', format:'pdf' },
{ text:'The JPEG compression specification', href:'http://www.w3.org/Graphics/JPEG/itu-t81.pdf', type:'W3', format:'pdf' },
{ text:'Exchangeable image file format for digital still cameras', href:'http://home.jeita.or.jp/tsc/std-pdf/CP3451C.pdf', type:'vendor', format:'pdf' }
],
references: [
{ text:'JPEG JFIF W3 Info', href:'http://www.w3.org/Graphics/JPEG/', type:'W3', format:'html' },
{ text:'JPEG.org', href:'http://www.jpeg.org/', type:'info', format:'html' },
{ text:'JPEG Exif App markers', href:'http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html', type:'info', format:'html'}
]
}
