1// Table B.1
2#[derive(Clone, Copy, Debug, PartialEq)]
3// Note: Established names.
4#[allow(clippy::upper_case_acronyms)]
5pub enum Marker {
6 /// Start Of Frame markers
7 ///
8 /// - SOF(0): Baseline DCT (Huffman coding)
9 /// - SOF(1): Extended sequential DCT (Huffman coding)
10 /// - SOF(2): Progressive DCT (Huffman coding)
11 /// - SOF(3): Lossless (sequential) (Huffman coding)
12 /// - SOF(5): Differential sequential DCT (Huffman coding)
13 /// - SOF(6): Differential progressive DCT (Huffman coding)
14 /// - SOF(7): Differential lossless (sequential) (Huffman coding)
15 /// - SOF(9): Extended sequential DCT (arithmetic coding)
16 /// - SOF(10): Progressive DCT (arithmetic coding)
17 /// - SOF(11): Lossless (sequential) (arithmetic coding)
18 /// - SOF(13): Differential sequential DCT (arithmetic coding)
19 /// - SOF(14): Differential progressive DCT (arithmetic coding)
20 /// - SOF(15): Differential lossless (sequential) (arithmetic coding)
21 SOF(u8),
22 /// Reserved for JPEG extensions
23 JPG,
24 /// Define Huffman table(s)
25 DHT,
26 /// Define arithmetic coding conditioning(s)
27 DAC,
28 /// Restart with modulo 8 count `m`
29 RST(u8),
30 /// Start of image
31 SOI,
32 /// End of image
33 EOI,
34 /// Start of scan
35 SOS,
36 /// Define quantization table(s)
37 DQT,
38 /// Define number of lines
39 DNL,
40 /// Define restart interval
41 DRI,
42 /// Define hierarchical progression
43 DHP,
44 /// Expand reference component(s)
45 EXP,
46 /// Reserved for application segments
47 APP(u8),
48 /// Reserved for JPEG extensions
49 JPGn(u8),
50 /// Comment
51 COM,
52 /// For temporary private use in arithmetic coding
53 TEM,
54 /// Reserved
55 RES,
56}
57
58impl Marker {
59 pub fn has_length(self) -> bool {
60 use self::Marker::*;
61 ! matches!(self, RST(..) | SOI | EOI | TEM)
62 }
63
64 pub fn from_u8(n: u8) -> Option<Marker> {
65 use self::Marker::*;
66 match n {
67 0x00 => None, // Byte stuffing
68 0x01 => Some(TEM),
69 0x02 ..= 0xBF => Some(RES),
70 0xC0 => Some(SOF(0)),
71 0xC1 => Some(SOF(1)),
72 0xC2 => Some(SOF(2)),
73 0xC3 => Some(SOF(3)),
74 0xC4 => Some(DHT),
75 0xC5 => Some(SOF(5)),
76 0xC6 => Some(SOF(6)),
77 0xC7 => Some(SOF(7)),
78 0xC8 => Some(JPG),
79 0xC9 => Some(SOF(9)),
80 0xCA => Some(SOF(10)),
81 0xCB => Some(SOF(11)),
82 0xCC => Some(DAC),
83 0xCD => Some(SOF(13)),
84 0xCE => Some(SOF(14)),
85 0xCF => Some(SOF(15)),
86 0xD0 => Some(RST(0)),
87 0xD1 => Some(RST(1)),
88 0xD2 => Some(RST(2)),
89 0xD3 => Some(RST(3)),
90 0xD4 => Some(RST(4)),
91 0xD5 => Some(RST(5)),
92 0xD6 => Some(RST(6)),
93 0xD7 => Some(RST(7)),
94 0xD8 => Some(SOI),
95 0xD9 => Some(EOI),
96 0xDA => Some(SOS),
97 0xDB => Some(DQT),
98 0xDC => Some(DNL),
99 0xDD => Some(DRI),
100 0xDE => Some(DHP),
101 0xDF => Some(EXP),
102 0xE0 => Some(APP(0)),
103 0xE1 => Some(APP(1)),
104 0xE2 => Some(APP(2)),
105 0xE3 => Some(APP(3)),
106 0xE4 => Some(APP(4)),
107 0xE5 => Some(APP(5)),
108 0xE6 => Some(APP(6)),
109 0xE7 => Some(APP(7)),
110 0xE8 => Some(APP(8)),
111 0xE9 => Some(APP(9)),
112 0xEA => Some(APP(10)),
113 0xEB => Some(APP(11)),
114 0xEC => Some(APP(12)),
115 0xED => Some(APP(13)),
116 0xEE => Some(APP(14)),
117 0xEF => Some(APP(15)),
118 0xF0 => Some(JPGn(0)),
119 0xF1 => Some(JPGn(1)),
120 0xF2 => Some(JPGn(2)),
121 0xF3 => Some(JPGn(3)),
122 0xF4 => Some(JPGn(4)),
123 0xF5 => Some(JPGn(5)),
124 0xF6 => Some(JPGn(6)),
125 0xF7 => Some(JPGn(7)),
126 0xF8 => Some(JPGn(8)),
127 0xF9 => Some(JPGn(9)),
128 0xFA => Some(JPGn(10)),
129 0xFB => Some(JPGn(11)),
130 0xFC => Some(JPGn(12)),
131 0xFD => Some(JPGn(13)),
132 0xFE => Some(COM),
133 0xFF => None, // Fill byte
134 }
135 }
136}
137