aurorafw.metadata.jpeg source code

1 module aurorafw.metadata.jpeg;
2 
3 enum JPEGVersion
4 {
5 	JPEG_CANON_EOS,
6 	JPEG_SAMSUNG_D500,
7 	Unknown
8 }
9 
10 import std.stdio : File;
11 
12 @safe
13 JPEGVersion getJPEGVersion(File file)
14 {
15 	char[4] buf = file.rawRead(new char[4]);
16 	if (buf[3] == 0xE2)
17 		return JPEGVersion.JPEG_CANON_EOS;
18 	else if (buf[3] == 0xE3)
19 		return JPEGVersion.JPEG_SAMSUNG_D500;
20 
21 	return JPEGVersion.Unknown;
22 }
23 
24 @safe pure
25 string toString(JPEGVersion ver)
26 {
27 	final switch (ver)
28 	{
29 	case JPEGVersion.JPEG_CANON_EOS:
30 		return "CANON EOS JPEG Format";
31 	case JPEGVersion.JPEG_SAMSUNG_D500:
32 		return "Samsung D500 JPEG Format";
33 	case JPEGVersion.Unknown:
34 		return "Unknown";
35 	}
36 }
37 
38 @safe
39 @("JPEG: Versioning")
40 unittest
41 {
42 	import std.file;
43 
44 	version (unittest) import aurorafw.unit.assertion;
45 	import std.conv : to;
46 
47 	scope (exit)
48 	{
49 		assert(exists(deleteme));
50 		remove(deleteme);
51 	}
52 
53 	JPEGVersion version_;
54 	char[] buf = [0xFF, 0xD8, 0xFF];
55 
56 	write(deleteme, buf ~ 0xE2);
57 	version_ = getJPEGVersion(File(deleteme));
58 	assertEquals(JPEGVersion.JPEG_CANON_EOS, version_);
59 	assertEquals("CANON EOS JPEG Format", version_.toString);
60 
61 	write(deleteme, buf ~ 0xE3);
62 	version_ = getJPEGVersion(File(deleteme));
63 	assertEquals(JPEGVersion.JPEG_SAMSUNG_D500, version_);
64 	assertEquals("Samsung D500 JPEG Format", version_.toString);
65 
66 	write(deleteme, buf ~ 0xFF);
67 	version_ = getJPEGVersion(File(deleteme));
68 	assertEquals(JPEGVersion.Unknown, version_);
69 	assertEquals("Unknown", version_.toString);
70 }