Jpeg文件格式转换成bmp文件格式

Jpeg文件格式转换成bmp文件格式为了简单，我将jpg图片原文件和转换后的bmp文件都直接存到内存的数组，这样不会涉及文件操作。将jpg文件转换成数组，并将数组存到文件中方便编译调用，我用的是C库文件操作接口，也可以用其他文件系统。//读文件int FILE_Read(FILE*fd, const void*buf, int len){#define READ_MAX_LEN         1024int cnt,leftLen;int hasread=0;cnt = len/READ_MAX_LEN;leftLen = len%READ_MAX_LEN;     if(cnt>0)hasread += READ_MAX_LEN*fread((char*)buf+hasread, READ_MAX_LEN, cnt, fd);  if(leftLen>0){while(!feof(fd)&&(len-hasread)>0){hasread += fread((char*)buf+hasread, 1, len-hasread, fd);if(ferror(fd)){break;}}}return hasread;}//将jpg文件保存到数组void SaveJpgFile2Arry(const char * jpgFileName ,unsigned char *jpgFileBuf, DWORD len){FILE *fd;DWORD i = 0;char *s2 = "};";char buf[50]={0};char rollEnd[]={0x0d,0x0a};FILE *fd;DWORD FileSize;unsigned char * pFile;//将文件读到缓冲区fd = fopen(jpgFileName,"rb");fseek(fd,0,SEEK_END);FileSize = ftell(fd);pFile = malloc(FileSize);fseek(fd,0,SEEK_SET);FILE_Read(fd,pFile,FileSize);fclose(fd);//生成jpg数据对应的数组文件，我的路径是：//      "E:\\UCGUI390_sim\\Start\\Application\\jpg_data.c",你需要改成你自己的存储路劲// fuck! 注意文件打开模式必须是2进制的，否则图片可能失真，其他文件系统不知道会不//会出问题fd = fopen("E:\\UCGUI390_sim\\Start\\Application\\jpg_data.c","wb+");//数组名：const unsigned char jpgData[]sprintf(buf,"const unsigned char jpgData[%d] = {",len);fwrite(buf,strlen(buf),1,fd);for (i =0; i<len; i++){if(i%16 == 0){fwrite(rollEnd,2,1,fd);      //换行符，最好不要直接使用字符串“\n”，有些编辑//器不识别}sprintf(buf,"0X%02X,", jpgFileBuf[i]);//十六进制格式fwrite(buf,strlen(buf),1,fd);  }fwrite(rollEnd,2,1,fd);     fwrite(s2,strlen(s2),1,fd);fclose(fd);}数组const unsigned char jpgData[]就是我们要转换的jpg文件数据。有了jpg数据文件，下一步就开始转换了。先生成一个头文件jpeg.h，头文件中声明一些数据类型以及定义相关数据结构和宏头文件源码如下：#ifndef JPG_H_#define JPG_H_#define M_SOF0  0xc0#define M_DHT   0xc4#define M_EOI   0xd9#define M_SOS   0xda#define M_DQT   0xdb#define M_DRI   0xdd#define M_APP0  0xe0static int Zig_Zag[8][8]={{0,1,5,6,14,15,27,28},{2,4,7,13,16,26,29,42},{3,8,12,17,25,30,41,43},{9,11,18,24,37,40,44,53},{10,19,23,32,39,45,52,54},{20,22,33,38,46,51,55,60},{21,34,37,47,50,56,59,61},{35,36,48,49,57,58,62,63}};#define W1 2841 /* 2048*sqrt(2)*cos(1*pi/16) */#define W2 2676 /* 2048*sqrt(2)*cos(2*pi/16) */#define W3 2408 /* 2048*sqrt(2)*cos(3*pi/16) */#define W5 1609 /* 2048*sqrt(2)*cos(5*pi/16) */#define W6 1108 /* 2048*sqrt(2)*cos(6*pi/16) */#define W7 565  /* 2048*sqrt(2)*cos(7*pi/16) */#define BI_RGB        0L#ifndef FALSE                      /* in case these macros already exist */#define FALSE  0                /* values of boolean */#endif#ifndef TRUE#define TRUE   1#endiftypedef unsigned long       DWORD;typedef int                 BOOL;typedef unsigned char       BYTE;typedef unsigned short      WORD;typedef long LONG;#define MAKEWORD(a, b)      ((WORD)(((BYTE)(a)) | ((WORD)((BYTE)(b))) << 8))typedef struct tagRGBQUAD {BYTE    rgbBlue;BYTE    rgbGreen;BYTE    rgbRed;BYTE    rgbReserved;} RGBQUAD;// fuck! 2字节对齐,否则编译器默认4字节对齐,导致文件头长度错误#pragma pack (2)typedef struct tagBITMAPFILEHEADER {WORD    bfType;DWORD   bfSize;WORD    bfReserved1;WORD    bfReserved2;DWORD   bfOffBits;} BITMAPFILEHEADER;#pragma pack()typedef struct tagBITMAPINFOHEADER{DWORD      biSize;LONG       biWidth;LONG       biHeight;WORD       biPlanes;WORD       biBitCount;DWORD      biCompression;DWORD      biSizeImage;LONG       biXPelsPerMeter;LONG       biYPelsPerMeter;DWORD      biClrUsed;DWORD      biClrImportant;} BITMAPINFOHEADER;#endif下面是转换文件源码jpg2bmp.c,这里声明下：源码来源于网上，我同学下的，其实也是昨天我同学问了我jpg文件显示相关问题，我今天才写了这篇博客。至于出处我也不知道，请作者见谅。我将其中文件操作去掉了，转换后的bmp文件数据直接存到内存，同时涉及vc的内容也去掉了，这样可以更独立的使用。/*start of file*/#include "jpeg.h"#include "stdio.h"#include "string.h"#include "stdlib.h"#define WIDTHBYTES(i)    ((i+31)/32*4)#define PI 3.1415926535#define FUNC_OK 0#define FUNC_MEMORY_ERROR 1#define FUNC_FILE_ERROR 2#define FUNC_FORMAT_ERROR 3////Jpeg functionsBOOL LoadJpegFile(char *BmpFileName);void showerror(int funcret);int  InitTag();void InitTable();int  Decode();int  DecodeMCUBlock();int  HufBlock(unsigned char dchufindex,unsigned char achufindex);int  DecodeElement();void IQtIZzMCUComponent(short flag);void IQtIZzBlock(short  *s ,int * d,short flag);void GetYUV(short flag);void StoreBuffer();BYTE ReadByte();void Initialize_Fast_IDCT();void Fast_IDCT(int * block);void idctrow(int * blk);void idctcol(int * blk);////global variable declarationBITMAPFILEHEADER   bf;BITMAPINFOHEADER   bi;char*            hBitmap=NULL;char*            hImgData=NULL;DWORD              NumColors;DWORD              LineBytes;DWORD              ImgWidth=0 , ImgHeight=0;unsigned int       PcxBytesPerLine;char*              lpPtr;////variables used in jpeg functionshort                           SampRate_Y_H,SampRate_Y_V;short                           SampRate_U_H,SampRate_U_V;short                           SampRate_V_H,SampRate_V_V;short                           H_YtoU,V_YtoU,H_YtoV,V_YtoV;short                           Y_in_MCU,U_in_MCU,V_in_MCU;unsigned char   *lpJpegBuf;unsigned char   *lp;short                           qt_table[3][64];short                           comp_num;BYTE                            comp_index[3];BYTE                      YDcIndex,YAcIndex,UVDcIndex,UVAcIndex;BYTE                            HufTabIndex;short                      *YQtTable,*UQtTable,*VQtTable;BYTE                            And[9]={0,1,3,7,0xf,0x1f,0x3f,0x7f,0xff};short                      code_pos_table[4][16],code_len_table[4][16];unsigned short         code_value_table[4][256];unsigned short         huf_max_value[4][16],huf_min_value[4][16];short                           BitPos,CurByte;short                           rrun,vvalue;short                           MCUBuffer[10*64];int                                QtZzMCUBuffer[10*64];short                           BlockBuffer[64];short                           ycoef,ucoef,vcoef;BOOL                           IntervalFlag;short                           interval=0;int                                Y[4*64],U[4*64],V[4*64];DWORD                sizei,sizej;short                          restart;static  long     iclip[1024];static  long     *iclp;char*   myBmpData;//jpg数据声明，这个就是我们之前生成的数组extern unsigned char jpgData[];int LoadJpegFile (void){DWORD                  ImgSize;int                                   funcret;FILE *fd;int bitmapFileHeaderLen,bitmapInfoHeaderLen;char *p;lpJpegBuf = jpgData;InitTable();if((funcret=InitTag())!=FUNC_OK){return 0;}bitmapFileHeaderLen = sizeof(BITMAPFILEHEADER);bitmapInfoHeaderLen = sizeof(BITMAPINFOHEADER);//create new bitmapfileheader and bitmapinfoheadermemset((char *)&bf,0,sizeof(BITMAPFILEHEADER));   memset((char *)&bi,0,sizeof(BITMAPINFOHEADER));bi.biSize=(DWORD)sizeof(BITMAPINFOHEADER);bi.biWidth=(LONG)(ImgWidth);bi.biHeight=(LONG)(ImgHeight);bi.biPlanes=1;bi.biBitCount=24;bi.biClrUsed=0;bi.biClrImportant=0;bi.biCompression=BI_RGB;NumColors=0;LineBytes=(DWORD)WIDTHBYTES(bi.biWidth*bi.biBitCount);ImgSize=(DWORD)LineBytes*bi.biHeight;bf.bfType=0x4d42;bf.bfSize=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+NumColors*sizeof(RGBQUAD)+ImgSize;bf.bfOffBits=(DWORD)(NumColors*sizeof(RGBQUAD)+sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER));if((hImgData=malloc(ImgSize))==NULL){return 0;}lpPtr=(char *)hImgData;if((SampRate_Y_H==0)||(SampRate_Y_V==0)){return 0 ;}funcret=Decode();if(funcret==FUNC_OK){/*用文件存储转换后的bmp数据，主要是为了在vc下验证数据转换是否正确在应用中可以去掉*/fd=fopen("E:\\UCGUI390_sim\\Start\\jpgFile\\test_my.bmp","wb+");fwrite(&bf,sizeof(BITMAPFILEHEADER),1,fd); //写BMP文件头fwrite(&bi,sizeof(BITMAPINFOHEADER),1,fd); //写BMP文件信息fwrite(hImgData,ImgSize,1,fd);            //写BMP位图数据fclose(fd);//直接将转换后的bmp数据存到内存数组中//申请内存if((myBmpData=malloc(bf.bfSize))==NULL){return 0;}p = myBmpData;memcpy(p,&bf,sizeof(BITMAPFILEHEADER));//存储bmp文件头p += sizeof(BITMAPFILEHEADER);memcpy(p,&bi,sizeof(BITMAPINFOHEADER)); //存储bmp信息头p += sizeof(BITMAPINFOHEADER);memcpy(p,hImgData,ImgSize); //存储bmp显示数据free(hImgData);  //释放直接存储图片数据申请的内存return 1;}else{return 0;}}/int InitTag(){BOOL finish=FALSE;BYTE id;short  llength;short  i,j,k;short  huftab1,huftab2;short  huftabindex;BYTE hf_table_index;BYTE qt_table_index;BYTE comnum;unsigned char  *lptemp;short  ccount;lp=lpJpegBuf+2;while (!finish){id=*(lp+1);lp+=2;switch (id){case M_APP0:llength=MAKEWORD(*(lp+1),*lp);lp+=llength;break;case M_DQT:llength=MAKEWORD(*(lp+1),*lp);qt_table_index=(*(lp+2))&0x0f;lptemp=lp+3;if(llength<80){for(i=0;i<64;i++)qt_table[qt_table_index][i]=(short)*(lptemp++);}else{for(i=0;i<64;i++)qt_table[qt_table_index][i]=(short)*(lptemp++);qt_table_index=(*(lptemp++))&0x0f;for(i=0;i<64;i++)qt_table[qt_table_index][i]=(short)*(lptemp++);}lp+=llength;              break;case M_SOF0:llength=MAKEWORD(*(lp+1),*lp);ImgHeight=MAKEWORD(*(lp+4),*(lp+3));ImgWidth=MAKEWORD(*(lp+6),*(lp+5));comp_num=*(lp+7);if((comp_num!=1)&&(comp_num!=3))return FUNC_FORMAT_ERROR;if(comp_num==3){comp_index[0]=*(lp+8);SampRate_Y_H=(*(lp+9))>>4;SampRate_Y_V=(*(lp+9))&0x0f;YQtTable=(short *)qt_table[*(lp+10)];comp_index[1]=*(lp+11);SampRate_U_H=(*(lp+12))>>4;SampRate_U_V=(*(lp+12))&0x0f;UQtTable=(short *)qt_table[*(lp+13)];comp_index[2]=*(lp+14);SampRate_V_H=(*(lp+15))>>4;SampRate_V_V=(*(lp+15))&0x0f;VQtTable=(short *)qt_table[*(lp+16)];}else{comp_index[0]=*(lp+8);SampRate_Y_H=(*(lp+9))>>4;SampRate_Y_V=(*(lp+9))&0x0f;YQtTable=(short *)qt_table[*(lp+10)];comp_index[1]=*(lp+8);SampRate_U_H=1;SampRate_U_V=1;UQtTable=(short *)qt_table[*(lp+10)];comp_index[2]=*(lp+8);SampRate_V_H=1;SampRate_V_V=1;VQtTable=(short *)qt_table[*(lp+10)];}lp+=llength;                                                       break;case M_DHT:            llength=MAKEWORD(*(lp+1),*lp);if (llength<0xd0){huftab1=(short)(*(lp+2))>>4;     //huftab1=0,1huftab2=(short)(*(lp+2))&0x0f;   //huftab2=0,1huftabindex=huftab1*2+huftab2;lptemp=lp+3;for (i=0; i<16; i++)code_len_table[huftabindex][i]=(short)(*(lptemp++));j=0;for (i=0; i<16; i++)if(code_len_table[huftabindex][i]!=0){k=0;while(k<code_len_table[huftabindex][i]){code_value_table[huftabindex][k+j]=(short)(*(lptemp++));k++;}j+=k;         }i=0;while (code_len_table[huftabindex][i]==0)i++;for (j=0;j<i;j++){huf_min_value[huftabindex][j]=0;huf_max_value[huftabindex][j]=0;}huf_min_value[huftabindex][i]=0;huf_max_value[huftabindex][i]=code_len_table[huftabindex][i]-1;for (j=i+1;j<16;j++){huf_min_value[huftabindex][j]=(huf_max_value[huftabindex][j-1]+1)<<1;huf_max_value[huftabindex][j]=huf_min_value[huftabindex][j]+code_len_table[huftabindex][j]-1;}code_pos_table[huftabindex][0]=0;for (j=1;j<16;j++)code_pos_table[huftabindex][j]=code_len_table[huftabindex][j-1]+code_pos_table[huftabindex][j-1];lp+=llength;}  //ifelse{hf_table_index=*(lp+2);lp+=2;while (hf_table_index!=0xff){huftab1=(short)hf_table_index>>4;     //huftab1=0,1huftab2=(short)hf_table_index&0x0f;   //huftab2=0,1huftabindex=huftab1*2+huftab2;lptemp=lp+1;ccount=0;for (i=0; i<16; i++){code_len_table[huftabindex][i]=(short)(*(lptemp++));ccount+=code_len_table[huftabindex][i];}ccount+=17;    j=0;for (i=0; i<16; i++)if(code_len_table[huftabindex][i]!=0){k=0;while(k<code_len_table[huftabindex][i]){code_value_table[huftabindex][k+j]=(short)(*(lptemp++));k++;}j+=k;}i=0;while (code_len_table[huftabindex][i]==0)i++;for (j=0;j<i;j++){huf_min_value[huftabindex][j]=0;huf_max_value[huftabindex][j]=0;}huf_min_value[huftabindex][i]=0;huf_max_value[huftabindex][i]=code_len_table[huftabindex][i]-1;for (j=i+1;j<16;j++){huf_min_value[huftabindex][j]=(huf_max_value[huftabindex][j-1]+1)<<1;huf_max_value[huftabindex][j]=huf_min_value[huftabindex][j]+code_len_table[huftabindex][j]-1;}code_pos_table[huftabindex][0]=0;for (j=1;j<16;j++)code_pos_table[huftabindex][j]=code_len_table[huftabindex][j-1]+code_pos_table[huftabindex][j-1];lp+=ccount;hf_table_index=*lp;}  //while}  //elsebreak;case M_DRI:llength=MAKEWORD(*(lp+1),*lp);restart=MAKEWORD(*(lp+3),*(lp+2));lp+=llength;break;case M_SOS:llength=MAKEWORD(*(lp+1),*lp);comnum=*(lp+2);if(comnum!=comp_num)return FUNC_FORMAT_ERROR;lptemp=lp+3;for (i=0;i<comp_num;i++){if(*lptemp==comp_index[0]){YDcIndex=(*(lptemp+1))>>4;   //YYAcIndex=((*(lptemp+1))&0x0f)+2;}else{UVDcIndex=(*(lptemp+1))>>4;   //U,VUVAcIndex=((*(lptemp+1))&0x0f)+2;}lptemp+=2;}lp+=llength;finish=TRUE;break;case M_EOI:   return FUNC_FORMAT_ERROR;break;default:if ((id&0xf0)!=0xd0){llength=MAKEWORD(*(lp+1),*lp);lp+=llength;}else lp+=2;break;}  //switch} //whilereturn FUNC_OK;}/void InitTable(){short i,j;sizei=sizej=0;ImgWidth=ImgHeight=0;rrun=vvalue=0;BitPos=0;CurByte=0;IntervalFlag=FALSE;restart=0;for(i=0;i<3;i++)for(j=0;j<64;j++)qt_table[i][j]=0;comp_num=0;HufTabIndex=0;for(i=0;i<3;i++)comp_index[i]=0;for(i=0;i<4;i++)for(j=0;j<16;j++){code_len_table[i][j]=0;code_pos_table[i][j]=0;huf_max_value[i][j]=0;huf_min_value[i][j]=0;}for(i=0;i<4;i++)for(j=0;j<256;j++)code_value_table[i][j]=0;for(i=0;i<10*64;i++){MCUBuffer[i]=0;QtZzMCUBuffer[i]=0;}for(i=0;i<4*64;i++){Y[i]=0;U[i]=0;V[i]=0;               }for(i=0;i<64;i++)BlockBuffer[i]=0;ycoef=ucoef=vcoef=0;}/int Decode(){int funcret;Y_in_MCU=SampRate_Y_H*SampRate_Y_V;U_in_MCU=SampRate_U_H*SampRate_U_V;V_in_MCU=SampRate_V_H*SampRate_V_V;H_YtoU=SampRate_Y_H/SampRate_U_H;V_YtoU=SampRate_Y_V/SampRate_U_V;H_YtoV=SampRate_Y_H/SampRate_V_H;V_YtoV=SampRate_Y_V/SampRate_V_V;Initialize_Fast_IDCT();while((funcret=DecodeMCUBlock())==FUNC_OK){interval++;if((restart)&&(interval % restart==0))IntervalFlag=TRUE;elseIntervalFlag=FALSE;IQtIZzMCUComponent(0);IQtIZzMCUComponent(1);IQtIZzMCUComponent(2);GetYUV(0);GetYUV(1);GetYUV(2);StoreBuffer();sizej+=SampRate_Y_H*8;if(sizej>=ImgWidth){sizej=0;sizei+=SampRate_Y_V*8;}if ((sizej==0)&&(sizei>=ImgHeight))break;}return funcret;}/void  GetYUV(short flag){short         H,VV;short         i,j,k,h;int              *buf;int              *pQtZzMCU;switch(flag){case 0:H=SampRate_Y_H;VV=SampRate_Y_V;buf=Y;pQtZzMCU=QtZzMCUBuffer;break;case 1:H=SampRate_U_H;VV=SampRate_U_V;buf=U;pQtZzMCU=QtZzMCUBuffer+Y_in_MCU*64;break;case 2:H=SampRate_V_H;VV=SampRate_V_V;buf=V;pQtZzMCU=QtZzMCUBuffer+(Y_in_MCU+U_in_MCU)*64;break;}for (i=0;i<VV;i++)for(j=0;j<H;j++)for(k=0;k<8;k++)for(h=0;h<8;h++)buf[(i*8+k)*SampRate_Y_H*8+j*8+h]=*pQtZzMCU++;}///void StoreBuffer(){short i,j;unsigned char  *lpbmp;unsigned char R,G,B;int y,u,v,rr,gg,bb;for(i=0;i<SampRate_Y_V*8;i++){if((sizei+i)<ImgHeight){lpbmp=((unsigned char *)lpPtr+(DWORD)(ImgHeight-sizei-i-1)*LineBytes+sizej*3);for(j=0;j<SampRate_Y_H*8;j++){if((sizej+j)<ImgWidth){y=Y[i*8*SampRate_Y_H+j];u=U[(i/V_YtoU)*8*SampRate_Y_H+j/H_YtoU];v=V[(i/V_YtoV)*8*SampRate_Y_H+j/H_YtoV];rr=((y<<8)+18*u+367*v)>>8;gg=((y<<8)-159*u-220*v)>>8;bb=((y<<8)+411*u-29*v)>>8;R=(unsigned char)rr;G=(unsigned char)gg;B=(unsigned char)bb;if (rr&0xffffff00) if (rr>255) R=255; else if (rr<0) R=0;if (gg&0xffffff00) if (gg>255) G=255; else if (gg<0) G=0;if (bb&0xffffff00) if (bb>255) B=255; else if (bb<0) B=0;*lpbmp++=B;*lpbmp++=G;*lpbmp++=R;}else  break;}}else break;}}///int DecodeMCUBlock(){short *lpMCUBuffer;short i,j;int funcret;if (IntervalFlag){lp+=2;ycoef=ucoef=vcoef=0;BitPos=0;CurByte=0;}switch(comp_num){case 3:lpMCUBuffer=MCUBuffer;for (i=0;i<SampRate_Y_H*SampRate_Y_V;i++)  //Y{funcret=HufBlock(YDcIndex,YAcIndex);if (funcret!=FUNC_OK)return funcret;BlockBuffer[0]=BlockBuffer[0]+ycoef;ycoef=BlockBuffer[0];for (j=0;j<64;j++)*lpMCUBuffer++=BlockBuffer[j];}for (i=0;i<SampRate_U_H*SampRate_U_V;i++)  //U{funcret=HufBlock(UVDcIndex,UVAcIndex);if (funcret!=FUNC_OK)return funcret;BlockBuffer[0]=BlockBuffer[0]+ucoef;ucoef=BlockBuffer[0];for (j=0;j<64;j++)*lpMCUBuffer++=BlockBuffer[j];}for (i=0;i<SampRate_V_H*SampRate_V_V;i++)  //V{funcret=HufBlock(UVDcIndex,UVAcIndex);if (funcret!=FUNC_OK)return funcret;BlockBuffer[0]=BlockBuffer[0]+vcoef;vcoef=BlockBuffer[0];for (j=0;j<64;j++)*lpMCUBuffer++=BlockBuffer[j];}break;case 1:lpMCUBuffer=MCUBuffer;funcret=HufBlock(YDcIndex,YAcIndex);if (funcret!=FUNC_OK)return funcret;BlockBuffer[0]=BlockBuffer[0]+ycoef;ycoef=BlockBuffer[0];for (j=0;j<64;j++)*lpMCUBuffer++=BlockBuffer[j];for (i=0;i<128;i++)*lpMCUBuffer++=0;break;default:return FUNC_FORMAT_ERROR;}return FUNC_OK;}//int HufBlock(BYTE dchufindex,BYTE achufindex){short count=0;short i;int funcret;//dcHufTabIndex=dchufindex;funcret=DecodeElement();if(funcret!=FUNC_OK)return funcret;BlockBuffer[count++]=vvalue;//acHufTabIndex=achufindex;while (count<64){funcret=DecodeElement();if(funcret!=FUNC_OK)return funcret;if ((rrun==0)&&(vvalue==0)){for (i=count;i<64;i++)BlockBuffer[i]=0;count=64;}else{for (i=0;i<rrun;i++)BlockBuffer[count++]=0;BlockBuffer[count++]=vvalue;}}return FUNC_OK;}//int DecodeElement(){int thiscode,tempcode;unsigned short temp,valueex;short codelen;BYTE hufexbyte,runsize,tempsize,sign;BYTE newbyte,lastbyte;if(BitPos>=1){BitPos--;thiscode=(BYTE)CurByte>>BitPos;CurByte=CurByte&And[BitPos];}else{lastbyte=ReadByte();BitPos--;newbyte=CurByte&And[BitPos];thiscode=lastbyte>>7;CurByte=newbyte;}codelen=1;while ((thiscode<huf_min_value[HufTabIndex][codelen-1])||(code_len_table[HufTabIndex][codelen-1]==0)||(thiscode>huf_max_value[HufTabIndex][codelen-1])){if(BitPos>=1){BitPos--;tempcode=(BYTE)CurByte>>BitPos;CurByte=CurByte&And[BitPos];}else{lastbyte=ReadByte();BitPos--;newbyte=CurByte&And[BitPos];tempcode=(BYTE)lastbyte>>7;CurByte=newbyte;}thiscode=(thiscode<<1)+tempcode;codelen++;if(codelen>16)return FUNC_FORMAT_ERROR;}  //whiletemp=thiscode-huf_min_value[HufTabIndex][codelen-1]+code_pos_table[HufTabIndex][codelen-1];hufexbyte=(BYTE)code_value_table[HufTabIndex][temp];rrun=(short)(hufexbyte>>4);runsize=hufexbyte&0x0f;if(runsize==0){vvalue=0;return FUNC_OK;}tempsize=runsize;if(BitPos>=runsize){BitPos-=runsize;valueex=(BYTE)CurByte>>BitPos;CurByte=CurByte&And[BitPos];}else{valueex=CurByte;tempsize-=BitPos;while(tempsize>8){lastbyte=ReadByte();valueex=(valueex<<8)+(BYTE)lastbyte;tempsize-=8;}  //whilelastbyte=ReadByte();BitPos-=tempsize;valueex=(valueex<<tempsize)+(lastbyte>>BitPos);CurByte=lastbyte&And[BitPos];}  //elsesign=valueex>>(runsize-1);if(sign)vvalue=valueex;else{valueex=valueex^0xffff;temp=0xffff<<runsize;vvalue=-(short)(valueex^temp);}return FUNC_OK;}/void IQtIZzMCUComponent(short flag){short H,VV;short i,j;int *pQtZzMCUBuffer;short  *pMCUBuffer;switch(flag){case 0:H=SampRate_Y_H;VV=SampRate_Y_V;pMCUBuffer=MCUBuffer;pQtZzMCUBuffer=QtZzMCUBuffer;break;case 1:H=SampRate_U_H;VV=SampRate_U_V;pMCUBuffer=MCUBuffer+Y_in_MCU*64;pQtZzMCUBuffer=QtZzMCUBuffer+Y_in_MCU*64;break;case 2:H=SampRate_V_H;VV=SampRate_V_V;pMCUBuffer=MCUBuffer+(Y_in_MCU+U_in_MCU)*64;pQtZzMCUBuffer=QtZzMCUBuffer+(Y_in_MCU+U_in_MCU)*64;break;}for(i=0;i<VV;i++)for (j=0;j<H;j++)IQtIZzBlock(pMCUBuffer+(i*H+j)*64,pQtZzMCUBuffer+(i*H+j)*64,flag);}//void IQtIZzBlock(short  *s ,int * d,short flag){short i,j;short tag;short *pQt;int buffer2[8][8];int *buffer1;short offset;switch(flag){case 0:pQt=YQtTable;offset=128;break;case 1:pQt=UQtTable;offset=0;break;case 2:pQt=VQtTable;offset=0;break;}for(i=0;i<8;i++)for(j=0;j<8;j++){tag=Zig_Zag[i][j];buffer2[i][j]=(int)s[tag]*(int)pQt[tag];}buffer1=(int *)buffer2;Fast_IDCT(buffer1);for(i=0;i<8;i++)for(j=0;j<8;j++)d[i*8+j]=buffer2[i][j]+offset;}///void Fast_IDCT(int * block){short i;for (i=0; i<8; i++)idctrow(block+8*i);for (i=0; i<8; i++)idctcol(block+i);}///BYTE  ReadByte(){BYTE  i;i=*(lp++);if(i==0xff)lp++;BitPos=8;CurByte=i;return i;}///void Initialize_Fast_IDCT(){short i;iclp = iclip+512;for (i= -512; i<512; i++)iclp[i] = (i<-256) ? -256 : ((i>255) ? 255 : i);}void idctrow(int * blk){int x0, x1, x2, x3, x4, x5, x6, x7, x8;//intcutif (!((x1 = blk[4]<<11) | (x2 = blk[6]) | (x3 = blk[2]) |(x4 = blk[1]) | (x5 = blk[7]) | (x6 = blk[5]) | (x7 = blk[3]))){blk[0]=blk[1]=blk[2]=blk[3]=blk[4]=blk[5]=blk[6]=blk[7]=blk[0]<<3;return;}x0 = (blk[0]<<11) + 128; // for proper rounding in the fourth stage//first stagex8 = W7*(x4+x5);x4 = x8 + (W1-W7)*x4;x5 = x8 - (W1+W7)*x5;x8 = W3*(x6+x7);x6 = x8 - (W3-W5)*x6;x7 = x8 - (W3+W5)*x7;//second stagex8 = x0 + x1;x0 -= x1;x1 = W6*(x3+x2);x2 = x1 - (W2+W6)*x2;x3 = x1 + (W2-W6)*x3;x1 = x4 + x6;x4 -= x6;x6 = x5 + x7;x5 -= x7;//third stagex7 = x8 + x3;x8 -= x3;x3 = x0 + x2;x0 -= x2;x2 = (181*(x4+x5)+128)>>8;x4 = (181*(x4-x5)+128)>>8;//fourth stageblk[0] = (x7+x1)>>8;blk[1] = (x3+x2)>>8;blk[2] = (x0+x4)>>8;blk[3] = (x8+x6)>>8;blk[4] = (x8-x6)>>8;blk[5] = (x0-x4)>>8;blk[6] = (x3-x2)>>8;blk[7] = (x7-x1)>>8;}//void idctcol(int * blk){int x0, x1, x2, x3, x4, x5, x6, x7, x8;//intcutif (!((x1 = (blk[8*4]<<8)) | (x2 = blk[8*6]) | (x3 = blk[8*2]) |(x4 = blk[8*1]) | (x5 = blk[8*7]) | (x6 = blk[8*5]) | (x7 = blk[8*3]))){blk[8*0]=blk[8*1]=blk[8*2]=blk[8*3]=blk[8*4]=blk[8*5]=blk[8*6]=blk[8*7]=iclp[(blk[8*0]+32)>>6];return;}x0 = (blk[8*0]<<8) + 8192;//first stagex8 = W7*(x4+x5) + 4;x4 = (x8+(W1-W7)*x4)>>3;x5 = (x8-(W1+W7)*x5)>>3;x8 = W3*(x6+x7) + 4;x6 = (x8-(W3-W5)*x6)>>3;x7 = (x8-(W3+W5)*x7)>>3;//second stagex8 = x0 + x1;x0 -= x1;x1 = W6*(x3+x2) + 4;x2 = (x1-(W2+W6)*x2)>>3;x3 = (x1+(W2-W6)*x3)>>3;x1 = x4 + x6;x4 -= x6;x6 = x5 + x7;x5 -= x7;//third stagex7 = x8 + x3;x8 -= x3;x3 = x0 + x2;x0 -= x2;x2 = (181*(x4+x5)+128)>>8;x4 = (181*(x4-x5)+128)>>8;//fourth stageblk[8*0] = iclp[(x7+x1)>>14];blk[8*1] = iclp[(x3+x2)>>14];blk[8*2] = iclp[(x0+x4)>>14];blk[8*3] = iclp[(x8+x6)>>14];blk[8*4] = iclp[(x8-x6)>>14];blk[8*5] = iclp[(x0-x4)>>14];blk[8*6] = iclp[(x3-x2)>>14];blk[8*7] = iclp[(x7-x1)>>14];}/*endof file*/调用int LoadJpegFile (void)这个函数后，转换后的bmp数据文件会存到myBmpData所指的内存中，我们可以调用Gui的bmp图片显示借口显示，也可转换成文件在pc上验证数据是否准确。

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Jpeg文件格式转换成bmp文件格式

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