/*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]);   }main(int argc,char *argv[]){      j_compress_struct main_cinfo;      int i,p;      char c;      jpeg_destination_mgr main_dest;      unsigned char fileheader[8];            /*the compact image data include only width and height*/      j_compress_ptr cinfo=&main_cinfo;      arith_entropy_encoder entropy;      jpeg_source_mgr src;      cinfo->src=&src;      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;      cinfo->unread_marker=0;      MEMZERO(cinfo->entropy->dc_stats,160);      MEMZERO(cinfo->entropy->context_b,1000);      MEMZERO(cinfo->entropy->val_b,1000);      MEMZERO(cinfo->pre.N,365*4);      MEMZERO(cinfo->pre.B,365*4);      MEMZERO(cinfo->pre.C,365*4);      cinfo->pre.reset=64;                cinfo->arith_dc_U=2;      cinfo->entropy->c = 0;      cinfo->entropy->a = 0x10000;      cinfo->entropy->sc = 0;      cinfo->entropy->zc = 0;      cinfo->entropy->ct = 0;      cinfo->entropy->last_val=0;      cinfo->entropy->context=0;      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);      }      sscanf(argv[3],"%d",&cinfo->pre.near);            #define UCH(x) ((int)(x))      #define GET_2B(array,offset)  ((unsigned int) UCH(array[offset+1]) + \			       (((unsigned int) UCH(array[offset])) << 8))      if (! ReadOK(cinfo->inputfile, fileheader, 6)){         printf("error when read the head of file");         exit(0);      }      cinfo->image_width = (UINT16) GET_2B(fileheader,2);      cinfo->image_height = (UINT16) GET_2B(fileheader,4);            cinfo->inbuffer=alloc_sarray((JDIMENSION) (4096),				  1,cinfo);                /*the inbuffer is a row of image elements now for*                                                            *one demintion prediction.                                                            */            src.next_input_byte=cinfo->inbuffer[0];      src.bytes_in_buffer=0;      /*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*/                      initial_decoder(cinfo);     for (i=0;i<(cinfo->image_height);i++){             decode_row(cinfo,i);     }                  /*kill all the buffer and output EOI marker*/                           /*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);}