zune_jpeg/
marker.rs

1/*
2 * Copyright (c) 2023.
3 *
4 * This software is free software;
5 *
6 * You can redistribute it or modify it under terms of the MIT, Apache License or Zlib license
7 */
8
9#![allow(clippy::upper_case_acronyms)]
10
11/// JPEG Markers
12///
13/// **NOTE** This doesn't cover all markers, just the ones zune-jpeg supports.
14#[derive(Clone, Copy, Debug, PartialEq, Eq)]
15pub enum Marker {
16    /// Start Of Frame markers
17    ///
18    /// - SOF(0):  Baseline DCT (Huffman coding)
19    /// - SOF(1):  Extended sequential DCT (Huffman coding)
20    /// - SOF(2):  Progressive DCT (Huffman coding)
21    /// - SOF(3):  Lossless (sequential) (Huffman coding)
22    /// - SOF(5):  Differential sequential DCT (Huffman coding)
23    /// - SOF(6):  Differential progressive DCT (Huffman coding)
24    /// - SOF(7):  Differential lossless (sequential) (Huffman coding)
25    /// - SOF(9):  Extended sequential DCT (arithmetic coding)
26    /// - SOF(10): Progressive DCT (arithmetic coding)
27    /// - SOF(11): Lossless (sequential) (arithmetic coding)
28    /// - SOF(13): Differential sequential DCT (arithmetic coding)
29    /// - SOF(14): Differential progressive DCT (arithmetic coding)
30    /// - SOF(15): Differential lossless (sequential) (arithmetic coding)
31    SOF(u8),
32    /// Define Huffman table(s)
33    DHT,
34    /// Define arithmetic coding conditioning(s)
35    DAC,
36    /// Restart with modulo 8 count `m`
37    RST(u8),
38    /// Start of image
39    SOI,
40    /// End of image
41    EOI,
42    /// Start of scan
43    SOS,
44    /// Define quantization table(s)
45    DQT,
46    /// Define number of lines
47    DNL,
48    /// Define restart interval
49    DRI,
50    /// Reserved for application segments
51    APP(u8),
52    /// Comment
53    COM,
54    /// Unknown markers
55    UNKNOWN(u8)
56}
57
58impl Marker {
59    pub fn from_u8(n: u8) -> Option<Marker> {
60        use self::Marker::{APP, COM, DAC, DHT, DNL, DQT, DRI, EOI, RST, SOF, SOI, SOS, UNKNOWN};
61
62        match n {
63            0xFE => Some(COM),
64            0xC0 => Some(SOF(0)),
65            0xC1 => Some(SOF(1)),
66            0xC2 => Some(SOF(2)),
67            0xC4 => Some(DHT),
68            0xCC => Some(DAC),
69            0xD0 => Some(RST(0)),
70            0xD1 => Some(RST(1)),
71            0xD2 => Some(RST(2)),
72            0xD3 => Some(RST(3)),
73            0xD4 => Some(RST(4)),
74            0xD5 => Some(RST(5)),
75            0xD6 => Some(RST(6)),
76            0xD7 => Some(RST(7)),
77            0xD8 => Some(SOI),
78            0xD9 => Some(EOI),
79            0xDA => Some(SOS),
80            0xDB => Some(DQT),
81            0xDC => Some(DNL),
82            0xDD => Some(DRI),
83            0xE0 => Some(APP(0)),
84            0xE1 => Some(APP(1)),
85            0xE2 => Some(APP(2)),
86            0xED => Some(APP(13)),
87            0xEE => Some(APP(14)),
88            _ => Some(UNKNOWN(n))
89        }
90    }
91}
zune_jpeg/marker.rs

zune_jpeg/
marker.rs
