1 files changed, 136 insertions, 0 deletions
diff --git a/vendor/jpeg-decoder/src/marker.rs b/vendor/jpeg-decoder/src/marker.rs
new file mode 100644
index 0000000..2fe74be
--- /dev/null
+++ b/vendor/jpeg-decoder/src/marker.rs
@@ -0,0 +1,136 @@
+// Table B.1
+#[derive(Clone, Copy, Debug, PartialEq)]
+// Note: Established names.
+#[allow(clippy::upper_case_acronyms)]
+pub enum Marker {
+    /// Start Of Frame markers
+    ///
+    /// - SOF(0):  Baseline DCT (Huffman coding)
+    /// - SOF(1):  Extended sequential DCT (Huffman coding)
+    /// - SOF(2):  Progressive DCT (Huffman coding)
+    /// - SOF(3):  Lossless (sequential) (Huffman coding)
+    /// - SOF(5):  Differential sequential DCT (Huffman coding)
+    /// - SOF(6):  Differential progressive DCT (Huffman coding)
+    /// - SOF(7):  Differential lossless (sequential) (Huffman coding)
+    /// - SOF(9):  Extended sequential DCT (arithmetic coding)
+    /// - SOF(10): Progressive DCT (arithmetic coding)
+    /// - SOF(11): Lossless (sequential) (arithmetic coding)
+    /// - SOF(13): Differential sequential DCT (arithmetic coding)
+    /// - SOF(14): Differential progressive DCT (arithmetic coding)
+    /// - SOF(15): Differential lossless (sequential) (arithmetic coding)
+    SOF(u8),
+    /// Reserved for JPEG extensions
+    JPG,
+    /// Define Huffman table(s)
+    DHT,
+    /// Define arithmetic coding conditioning(s)
+    DAC,
+    /// Restart with modulo 8 count `m`
+    RST(u8),
+    /// Start of image
+    SOI,
+    /// End of image
+    EOI,
+    /// Start of scan
+    SOS,
+    /// Define quantization table(s)
+    DQT,
+    /// Define number of lines
+    DNL,
+    /// Define restart interval
+    DRI,
+    /// Define hierarchical progression
+    DHP,
+    /// Expand reference component(s)
+    EXP,
+    /// Reserved for application segments
+    APP(u8),
+    /// Reserved for JPEG extensions
+    JPGn(u8),
+    /// Comment
+    COM,
+    /// For temporary private use in arithmetic coding
+    TEM,
+    /// Reserved
+    RES,
+}
+
+impl Marker {
+    pub fn has_length(self) -> bool {
+        use self::Marker::*;
+        ! matches!(self, RST(..) | SOI | EOI | TEM)
+    }
+
+    pub fn from_u8(n: u8) -> Option<Marker> {
+        use self::Marker::*;
+        match n {
+            0x00 => None, // Byte stuffing
+            0x01 => Some(TEM),
+            0x02 ..= 0xBF => Some(RES),
+            0xC0 => Some(SOF(0)),
+            0xC1 => Some(SOF(1)),
+            0xC2 => Some(SOF(2)),
+            0xC3 => Some(SOF(3)),
+            0xC4 => Some(DHT),
+            0xC5 => Some(SOF(5)),
+            0xC6 => Some(SOF(6)),
+            0xC7 => Some(SOF(7)),
+            0xC8 => Some(JPG),
+            0xC9 => Some(SOF(9)),
+            0xCA => Some(SOF(10)),
+            0xCB => Some(SOF(11)),
+            0xCC => Some(DAC),
+            0xCD => Some(SOF(13)),
+            0xCE => Some(SOF(14)),
+            0xCF => Some(SOF(15)),
+            0xD0 => Some(RST(0)),
+            0xD1 => Some(RST(1)),
+            0xD2 => Some(RST(2)),
+            0xD3 => Some(RST(3)),
+            0xD4 => Some(RST(4)),
+            0xD5 => Some(RST(5)),
+            0xD6 => Some(RST(6)),
+            0xD7 => Some(RST(7)),
+            0xD8 => Some(SOI),
+            0xD9 => Some(EOI),
+            0xDA => Some(SOS),
+            0xDB => Some(DQT),
+            0xDC => Some(DNL),
+            0xDD => Some(DRI),
+            0xDE => Some(DHP),
+            0xDF => Some(EXP),
+            0xE0 => Some(APP(0)),
+            0xE1 => Some(APP(1)),
+            0xE2 => Some(APP(2)),
+            0xE3 => Some(APP(3)),
+            0xE4 => Some(APP(4)),
+            0xE5 => Some(APP(5)),
+            0xE6 => Some(APP(6)),
+            0xE7 => Some(APP(7)),
+            0xE8 => Some(APP(8)),
+            0xE9 => Some(APP(9)),
+            0xEA => Some(APP(10)),
+            0xEB => Some(APP(11)),
+            0xEC => Some(APP(12)),
+            0xED => Some(APP(13)),
+            0xEE => Some(APP(14)),
+            0xEF => Some(APP(15)),
+            0xF0 => Some(JPGn(0)),
+            0xF1 => Some(JPGn(1)),
+            0xF2 => Some(JPGn(2)),
+            0xF3 => Some(JPGn(3)),
+            0xF4 => Some(JPGn(4)),
+            0xF5 => Some(JPGn(5)),
+            0xF6 => Some(JPGn(6)),
+            0xF7 => Some(JPGn(7)),
+            0xF8 => Some(JPGn(8)),
+            0xF9 => Some(JPGn(9)),
+            0xFA => Some(JPGn(10)),
+            0xFB => Some(JPGn(11)),
+            0xFC => Some(JPGn(12)),
+            0xFD => Some(JPGn(13)),
+            0xFE => Some(COM),
+            0xFF => None, // Fill byte
+        }
+    }
+}