#include?“stdio.h“
#include?“windows.h“
//宏定義
#define?SBYTE??signed??char
#define?SWORD??signed??short?int
#define?WORD???unsigned?short?int
#define?DWORD??unsigned?long?int
#define?SDWORD?signed?long?int
#define??Y（RGB）?（（BYTE）（?（YRtab[（R）]+YGtab[（G）]+YBtab[（B）]）>>16?）?-?128）
#define?Cb（RGB）?（（BYTE）（?（CbRtab[（R）]+CbGtab[（G）]+CbBtab[（B）]）>>16?）?）
#define?Cr（RGB）?（（BYTE）（?（CrRtab[（R）]+CrGtab[（G）]+CrBtab[（B）]）>>16?）?）
#define?writebyte（b）?fputc（（b）fp_jpeg_stream）???
#define?writeword（w）?writebyte（（w）/256）;writebyte（（w）%256）;
//定義解碼時用到的一些結構體
static?struct?APP0infotype?{
??WORD?marker;???????????
??WORD?length;???????????
??BYTE?JFIFsignature[5];?
??BYTE?versionhi;????????
??BYTE?versionlo;????????
??BYTE?xyunits;??????????????????????????????
??WORD?xdensity;?????????
??WORD?ydensity;?????????
??BYTE?thumbnwidth;??????
??BYTE?thumbnheight;?????
}?APP0info={0xFFE016‘J‘‘F‘‘I‘‘F‘01101100};
static?struct??SOF0infotype?{
??WORD?marker;????????
??WORD?length;??????
??BYTE?precision?;????
??WORD?height?;
??WORD?width;
??BYTE?nrofcomponents;
??BYTE?IdY;???????????
??BYTE?HVY;??????????
??BYTE?QTY;???????????
??BYTE?IdCb;??????????
??BYTE?HVCb;
??BYTE?QTCb;??????????
??BYTE?IdCr;??????????
??BYTE?HVCr;
??BYTE?QTCr;?????????
}?SOF0info?=?{?0xFFC017800310x11020x11130x111};
static?struct?DQTinfotype?{
???WORD?marker;?
???WORD?length;?
???BYTE?QTYinfo;
???BYTE?Ytable[64];
???BYTE?QTCbinfo;?
???BYTE?Cbtable[64];
?????}?DQTinfo;
static?struct?DHTinfotype?{
???WORD?marker;??????????
???WORD?length;??????????
???BYTE?HTYDCinfo;???????
???BYTE?YDC_nrcodes[16];?
???BYTE?YDC_values[12];
???BYTE?HTYACinfo;???????
???BYTE?YAC_nrcodes[16];
???BYTE?YAC_values[162];
???BYTE?HTCbDCinfo;?
???BYTE?CbDC_nrcodes[16];
???BYTE?CbDC_values[12];
???BYTE?HTCbACinfo;?
???BYTE?CbAC_nrcodes[16];
???BYTE?CbAC_values[162];
}?DHTinfo;
static?struct?SOSinfotype?{
???WORD?marker;?????????
???WORD?length;?????????
???BYTE?nrofcomponents;?
???BYTE?IdY;????????????
???BYTE?HTY;????????????
???BYTE?IdCb;??????????
???BYTE?HTCb;??????????
???BYTE?IdCr;??????????
???BYTE?HTCr;??????????
???BYTE?SsSeBf;???????
}?SOSinfo={0xFFDA1231020x1130x1100x3F0};
typedef?struct?{?BYTE?BGR;?}?colorRGB;
typedef?struct?{?BYTE?length;WORD?value;}?bitstring;
//定義解碼時經常用到的常量
static?BYTE?zigzag[64]={?0?1?5?614152728
???????????????????2?4?71316262942
???????????????????3?8121725304143
???????????????????911182431404453
??????????????????1019233239455254
??????????????????2022333846515560
??????????????????2134374750565961
??????????????????3536484957586263?};
static?BYTE?std_luminance_qt[64]?=?{???????
?16??11??10??16??24??40??51??61
?12??12??14??19??26??58??60??55
?14??13??16??24??40??57??69??56
?14??17??22??29??51??87??80??62
?18??22??37??56??68?109?103??77
?24??35??55??

?屬性????????????大小?????日期????時間???名稱
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?????文件??????23320??2013-05-02?23:18??bmp2jpg.c

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????????????????23320????????????????????1