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📄 jpeg文件格式简单分析 - 计算机之路 - blogjava.htm

📁 一个jpeg的解码库
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style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;</SPAN>****************<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>Content ID: 1<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>H Factor: 2<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>V Factor: 2<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>QT ID: 0<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>****************<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>Content ID: 2<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>H Factor: 1<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>V Factor: 1<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>QT 
ID: 1<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>****************<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>Content ID: 3<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>H Factor: 1<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>V Factor: 1<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>QT ID: 1<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>Length: 0x11<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>DHT<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>Type: DC TABLE<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>ID: 0<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN 
style="mso-spacerun: yes">&nbsp;</SPAN>Length: 0x1f<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>DHT<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>Type: AC TABLE<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>ID: 0<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>Length: 0xb5<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>DHT<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>Type: DC TABLE<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>ID: 1<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>Length: 0x1f<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>DHT<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>Type: AC TABLE<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>ID: 1<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; </SPAN><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;</SPAN>Length: 
0xb5<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt"><SPAN 
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>SOS<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>Length: 0xc<SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN>&lt;-Will Not Process This Seg.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt">FATAL ERROR: File 
Structure Does NOT Support.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US 
style="FONT-FAMILY: Verdana; mso-bidi-font-size: 10.5pt">&nbsp;<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 21pt; TEXT-INDENT: 21pt"><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">你首先会想到为什么最后会出现一个错误的信息呢？这是因为，在</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">SOS</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">（</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">Start Of Scan</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">）段的后面，就是编码后的一行一行的图像信息。不再是段的结构了。在开始的</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">SOI</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">（</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">Start Of Image</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">）不是一个段，它是文件的开始，它的值也是类似于</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">0xFF</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">，</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">0xXX</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">的结构（</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">SOI</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">的具体数值清自己察看相关书籍，本文章中将不作重点介绍），但是后面没有段的长度。在文件的最后，有一个</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">EOI</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">（</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">End Of Image</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">）的标识，它的结构和</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">SOI</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">是类似的。它标志着文件的结束。</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 21pt; TEXT-INDENT: 21pt"><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">在这中间，包含了</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">APP0</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">段，</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">DQT</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">段，</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">SOF0</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">段，</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">DHT</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">段，</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">SOS</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">段。有的段的个数是不唯一的，比方说</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma">DQT</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Tahoma; mso-bidi-font-family: Tahoma; mso-ascii-font-family: Tahoma">段。我们现在重点地介绍各个段的作用。</SPAN><SPAN 
lang=EN-US style="FONT-FAMILY: Tahoma"><o:p></o:p></SPAN></P>
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