Open JPEG file format parsing with text

The JFIF file format uses the JPEG standard directly for many of the tags defined by the application, so the JFIF format becomes the de facto standard for JPEG file interchange formats. Each token of a JPEG is made up of 2 bytes, and the first byte is a fixed value of 0xFF. You can also add an unlimited number of 0xFF padding bytes (fill byte) before each tag. Here are 8 of these tags:

SOI 0xd8 Image Start

APP0 0xe0 JFIF Application Data block

APPN 0XE1-0XEF Other Application data blocks (n, 1~15)

DQT 0xDB Quantization meter

SOF0 0xc0 Frame Start

DHT 0xc4 Hoffman (Huffman) Table

SOS 0xDA Scan Line started

EOI 0xd9 Image End