/*This file is used to finish the compression of a gray image *jpeglole.c ,jcmarker.c ,jarithc.c,jaricom.c need to combined together. */#include "commondecls.h"void  *alloc_one_row(j_compress_ptr cinfo,size_t size_object){  void *buffer_ptr;   buffer_ptr=cinfo->buffer[cinfo->buffer_count++]=(void *)     malloc(size_object);  return buffer_ptr;}/*arrage several rows buffer,that is a array*/JSAMPARRAYalloc_sarray (JDIMENSION samplesperrow, JDIMENSION numrows,j_compress_ptr cinfo)/* Allocate a 2-D sample array */{  JSAMPARRAY result;  JSAMPROW workspace;  int currow;   /* Get space for row pointers (small object) */  result = (JSAMPARRAY) alloc_one_row(cinfo,((size_t) numrows) * SIZEOF(JSAMPROW));  /* Get the rows themselves (large objects) */  currow = 0;  while (currow < numrows) {    workspace = (JSAMPROW) alloc_one_row(cinfo,((size_t) (samplesperrow)		  * SIZEOF(JSAMPLE)));    result[currow++] = workspace;      }  return result;}LOCAL(void)free_mem(j_compress_ptr cinfo){  int i;    for (i=0;i<cinfo->buffer_count;i++)       free(cinfo->buffer[i]);   }/*the fowllowing function is used to input image data to the inbuffer*/voidinput_image_data(j_compress_ptr cinfo){  int j,input_lines;  JSAMPARRAY in_array=cinfo->inbuffer;  input_lines=1;    for(j=0;j<input_lines;j++)    JFREAD(cinfo->inputfile,in_array[j],cinfo->image_width);   } /*the following function acomplish the arithmetic  entropy coding*/voidcompress_data(j_compress_ptr cinfo,int i){    JDIMENSION bi;  JSAMPARRAY in_array=cinfo->inbuffer;    /*dipose a row of image*/          encode_row (cinfo,in_array[0],i);          }main(int argc,char *argv[]){      j_compress_struct main_cinfo;      int i,p;      char c;      jpeg_destination_mgr main_dest;      unsigned char fileheader[4];            /*the compact image data include only width and height*/      j_compress_ptr cinfo=&main_cinfo;      arith_entropy_encoder entropy;            cinfo->dest=&main_dest;      cinfo->buffer_count=0;      cinfo->entropy=&entropy;      main_cinfo.outbuffer=(JOCTET *) alloc_one_row(cinfo,(size_t) (OUTPUT_BUF_SIZE)); /*sizeof(JOCTET) is 1 */      main_dest.next_output_byte =cinfo->outbuffer;      main_dest.free_in_buffer = OUTPUT_BUF_SIZE;      cinfo->arith_dc_L=1;      cinfo->first_line=0;      MEMZERO(cinfo->entropy->dc_stats,160);      MEMZERO(cinfo->entropy->context_b,1000);      MEMZERO(cinfo->entropy->val_b,1000);      MEMZERO(cinfo->pre.B,4*365);      MEMZERO(cinfo->pre.N,4*365);       MEMZERO(cinfo->pre.C,4*365);                cinfo->pre.reset=64;      cinfo->entropy->last_val=0;      cinfo->entropy->context=0;      cinfo->arith_dc_U=2;      cinfo->entropy->c = 0;      cinfo->entropy->a = 0x10000L;      cinfo->entropy->sc = 0;      cinfo->entropy->zc = 0;      cinfo->entropy->ct = 11;      cinfo->entropy->buffer = -1;            /* empty */     if((cinfo->inputfile=fopen(argv[1],"rb"))==NULL){	printf("The %s can't be opended\n",argv[1]);	exit(0);      }      if((cinfo->outputfile=fopen(argv[2],"wb+"))==NULL){	printf("The %s can't be created\n",argv[2]);	exit(0);      }                  #define UCH(x) ((int)(x))      #define GET_2B(array,offset)  ((unsigned int) UCH(array[offset]) + \			       (((unsigned int) UCH(array[offset+1])) << 8))      if (! ReadOK(cinfo->inputfile, fileheader, 4)){         printf("error when read the head of file");         exit(0);      }      cinfo->image_width = (UINT16) GET_2B(fileheader,0);      cinfo->image_height = (UINT16) GET_2B(fileheader,2);            cinfo->inbuffer=alloc_sarray((JDIMENSION) (cinfo->image_width),				  1,cinfo);                /*the inbuffer is a row of image elements now for*                                                            *one demintion prediction.                                                            */            /*create the quality and huff table*/      /*create_huff (cinfo); It is keeped for later compareration*/                      /*write the proper file header,for simplisity we only reserve the SOI and EOI symbole*/      write_file_header (cinfo);                  /*prepare for the compresion*/      /*jpeg_make_c_derived_tbl (cinfo, 1,       *		      &(cinfo->d_dc_huff_tbl_ptr));       *jpeg_make_c_derived_tbl (cinfo, 0,       *		      &(cinfo->d_ac_huff_tbl_ptr));       */     /*Enthopy coding and write to the JPEG file*/                          for (i=0;i<(cinfo->image_height);i++){             input_image_data(cinfo);       compress_data(cinfo,i);                   /*include DCT and entropy coding*/       if (i==0)	 cinfo->first_line=0;     }                  /*kill all the buffer and output EOI marker*/     flush_bits (cinfo);                      /*out put the patial image data*/     write_file_trailer (cinfo);      JFWRITE(cinfo->outputfile, cinfo->outbuffer,        (((size_t) (OUTPUT_BUF_SIZE))-cinfo->dest->free_in_buffer));          free_mem(cinfo);     /*fseek(cinfo->inputfile,-2,2);*/     p=0;      while(getc(cinfo->inputfile)!=EOF)		    p++;      printf("the mumber is%d\n",p);      fclose(cinfo->inputfile);      fclose(cinfo->outputfile);}