decoder.c

实现图像的jpeg无损压缩

								}
							else 
							{
								local_cscanline=cscanline;
								local_pscanline=pscanline;
							}

							if ( lossless_undoscanline(local_pscanline, local_cscanline, columns, n_c ) != 0 )
							{
								fprintf(stderr,"*** Premature EOF: expected %d rows, got %d\n",rows, n-1);
								found_EOF = 1;
								break;
							}

							if (components>1)
								for (my_i=0;my_i<columns+LEFTMARGIN+RIGHTMARGIN;my_i++)
									cscanline[-components+my_i*components+n_c]=local_cscanline[-1+my_i];
						}

						write_one_line(cscanline + components, components*columns, out);

						tot_out += components*columns;

						/* extend the edges */
						for (n_c=0;n_c<components;n_c++)
							cscanline[components*(columns+1)+n_c] = cscanline[components*columns+n_c];

						/* make the current scanline the previous one */
						swaplines();

						/* Take out the Restart Markers */
						if (got_restart)
						{
							/* Look for restart markers only after a restart interval */
							if ((MCUs_counted % restart_interval) == 0)
							{
								bitiflush();
								read_n_bytes(in, 2);	/* read the RST marker */
								bitiinit();
							}
							MCUs_counted++;

						}

					}	/* End of while loop for each file line */

				else

					/* LOSSY MODE */
					while (++n <= rows)
					{
						/* 'extend' the edges */
						for (n_c=0;n_c<components;n_c++)
							cscanline[-components+n_c]=cscanline[n_c]=pscanline[components+n_c];

						for (n_c=0;n_c<components;n_c++)
						{
							if (components>1)
								for (my_i=0;my_i<columns+LEFTMARGIN+RIGHTMARGIN;my_i++)
								{
									local_cscanline[-1+my_i]=cscanline[-components+my_i*components+n_c];
									local_pscanline[-1+my_i]=pscanline[-components+my_i*components+n_c];
								}
							else 
							{
								local_cscanline=cscanline;
								local_pscanline=pscanline;
							}

							if ( lossy_undoscanline(local_pscanline, local_cscanline, columns, n_c ) != 0 )
							{
								fprintf(stderr,"*** Premature EOF: expected %d rows, got %d\n",rows, n-1);
								found_EOF = 1;
								break;
							}

							if (components>1)
								for (my_i=0;my_i<columns+LEFTMARGIN+RIGHTMARGIN;my_i++)
									cscanline[-components+my_i*components+n_c]=local_cscanline[-1+my_i];
						}

						write_one_line(cscanline + components, components*columns, out);

						tot_out += components*columns;

						/* extend the edges */
						for (n_c=0;n_c<components;n_c++)
							cscanline[components*(columns+1)+n_c] = cscanline[components*columns+n_c];

						/* make the current scanline the previous one */
						swaplines();

						/* Take out the Restart Markers */
						if (got_restart)
						{
							/* Look for restart markers only after a restart interval */
							if ((MCUs_counted % restart_interval) == 0)
							{
								bitiflush();
								read_n_bytes(in, 2);	/* read the RST marker */
								bitiinit();
							}
							MCUs_counted++;

						}

					}	/* End of while loop for each file line */

			}
			else
			{		/* Multiple files */
				/* color_mode==LINE_INT and multi==1 */
				/***********************************************************************/
				/*           Line interleaved mode with multiple files received        */
				/***********************************************************************/

				n++;

				if (lossy==FALSE)

					/* LOSSLESS MODE */
					while (n <= c_rows[whose_max_size_rows])
					{
						for (n_c=0;n_c<components;n_c++)
						{
							for (n_r=0;n_r<samplingy[n_c];n_r++)
							{

								/* 'extend' the edges */
								c_cscanline[n_c][-1]=c_cscanline[n_c][0]=c_pscanline[n_c][1];

								if ( lossless_undoscanline(c_pscanline[n_c], c_cscanline[n_c], c_columns[n_c], n_c ) != 0 )
								{
									fprintf(stderr,"*** Premature EOF: expected %d rows, got %d\n",rows, n-1);
									found_EOF = 1;
									break;
								}

								write_one_line(c_cscanline[n_c] + 1, c_columns[n_c], c_out[n_c]);

								tot_out += c_columns[n_c];

								/* extend the edges */
								c_cscanline[n_c][c_columns[n_c]+1] = c_cscanline[n_c][c_columns[n_c]];

								/* make the current scanline the previous one */
								c_swaplines(n_c);
							}
						}	/* End of for loop for each component */

						n+=samplingy[whose_max_size_rows];

						/* Take out the Restart Markers */
						if (got_restart)
						{
							/* Look for restart markers only after a restart interval */
							if ((MCUs_counted % restart_interval) == 0)
							{
								bitiflush();
								read_n_bytes(in, 2);	/* read the RST marker */
								bitiinit();
							}
							MCUs_counted++;

						}

					}	/* End of while loop for each line */

				else

					/* LOSSY MODE */
					while (n <= c_rows[whose_max_size_rows])
					{
						for (n_c=0;n_c<components;n_c++)
						{
							for (n_r=0;n_r<samplingy[n_c];n_r++)
							{

								/* 'extend' the edges */
								c_cscanline[n_c][-1]=c_cscanline[n_c][0]=c_pscanline[n_c][1];

								if ( lossy_undoscanline(c_pscanline[n_c], c_cscanline[n_c], c_columns[n_c], n_c ) != 0 )
								{
									fprintf(stderr,"*** Premature EOF: expected %d rows, got %d\n",rows, n-1);
									found_EOF = 1;
									break;
								}

								write_one_line(c_cscanline[n_c] + 1, c_columns[n_c], c_out[n_c]);

								tot_out += c_columns[n_c];

								/* extend the edges */
								c_cscanline[n_c][c_columns[n_c]+1] = c_cscanline[n_c][c_columns[n_c]];

								/* make the current scanline the previous one */
								c_swaplines(n_c);
							}
						}	/* End of for loop for each component */

						n+=samplingy[whose_max_size_rows];

						/* Take out the Restart Markers */
						if (got_restart)
						{
							/* Look for restart markers only after a restart interval */
							if ((MCUs_counted % restart_interval) == 0)
							{
								bitiflush();
								read_n_bytes(in, 2);	/* read the RST marker */
								bitiinit();
							}
							MCUs_counted++;

						}

					}	/* End of while loop for each line */


			}		/* Closes the else, LINE_INT and multi=1 */

		}		/* End of part for LINE_INT */

		else {		/* Non LINE_INT mode */
			if (color_mode==PIXEL_INT) {
				/***********************************************************************/
				/*           Pixel interleaved mode with single file received          */
				/***********************************************************************/

				if (lossy==FALSE)

					/* LOSSLESS MODE */
					while (++n <= rows)
					{
						/* 'extend' the edges */
						for (n_c=0;n_c<components;n_c++)
							cscanline[-components+n_c]=cscanline[n_c]=pscanline[components+n_c];

						if ( lossless_undoscanline_pixel(pscanline, cscanline, components*columns) != 0 )
						{
							fprintf(stderr,"*** Premature EOF: expected %d rows, got %d\n",rows,n-1);
							found_EOF = 1;
							break;
						}

						write_one_line(cscanline+components, components*columns, out);

						tot_out += components*columns;

						/* extend the edges */
						for (n_c=0;n_c<components;n_c++)
							cscanline[components*(columns+1)+n_c] = cscanline[components*columns+n_c];

						/* make the current scanline the previous one */
						swaplines();

						/* Take out the Restart Markers */
						if (got_restart)
						{
							/* Look for restart markers only after a restart interval */
							if ((MCUs_counted % restart_interval) == 0)
							{
								bitiflush();
								read_n_bytes(in, 2);	/* read the RST marker */
								bitiinit();
							}
							MCUs_counted++;

						}

					}	/* End of line loop for PIXEL_INT */


				else

					/* LOSSY MODE */
					while (++n <= rows)
					{
						/* 'extend' the edges */
						for (n_c=0;n_c<components;n_c++)
							cscanline[-components+n_c]=cscanline[n_c]=pscanline[components+n_c];

						if ( lossy_undoscanline_pixel(pscanline, cscanline, components*columns) != 0 )
						{
							fprintf(stderr,"*** Premature EOF: expected %d rows, got %d\n",rows,n-1);
							found_EOF = 1;
							break;
						}

						write_one_line(cscanline+components, components*columns, out);

						tot_out += components*columns;

						/* extend the edges */
						for (n_c=0;n_c<components;n_c++)
							cscanline[components*(columns+1)+n_c] = cscanline[components*columns+n_c];

						/* make the current scanline the previous one */
						swaplines();

						/* Take out the Restart Markers */
						if (got_restart)
						{
							/* Look for restart markers only after a restart interval */
							if ((MCUs_counted % restart_interval) == 0)
							{
								bitiflush();
								read_n_bytes(in, 2);	/* read the RST marker */
								bitiinit();
							}
							MCUs_counted++;

						}

					}	/* End of line loop for PIXEL_INT */

			}
			else {
				/***********************************************************************/
				/*           Plane interleaved mode 				       */
				/***********************************************************************/

				if (lossy==FALSE)

					/* LOSSLESS MODE */
					while (++n <= c_rows[n_s])
					{
						/* 'extend' the edges */
						c_cscanline[n_s][-1]=c_cscanline[n_s][0]=c_pscanline[n_s][1];

						if (lossless_undoscanline(c_pscanline[n_s], c_cscanline[n_s], c_columns[n_s], n_s ) != 0 )
						{
							fprintf(stderr,"*** Premature EOF: expected %d rows, got %d\n",rows, n-1);
							found_EOF = 1;
							break;
						}

						write_one_line(c_cscanline[n_s]+1, c_columns[n_s], c_out[n_s]);

						tot_out += c_columns[n_s];

						/* extend the edges */
						c_cscanline[n_s][c_columns[n_s]+1] = c_cscanline[n_s][c_columns[n_s]];

						/* make the current scanline the previous one */
						c_swaplines(n_s);

						/* Take out the Restart Markers */
						if (got_restart)
						{
							/* Look for restart markers only after a restart interval */
							if ((MCUs_counted % restart_interval) == 0)
							{
								bitiflush();
								read_n_bytes(in, 2);	/* read the RST marker */
								bitiinit();
							}
							MCUs_counted++;

						}

					}	/* End of line loop in PLANE_INT */

				else

					/* LOSSY MODE */
					while (++n <= c_rows[n_s])
					{
						/* 'extend' the edges */
						c_cscanline[n_s][-1]=c_cscanline[n_s][0]=c_pscanline[n_s][1];

						if (lossy_undoscanline(c_pscanline[n_s], c_cscanline[n_s], c_columns[n_s], n_s ) != 0 )
						{
							fprintf(stderr,"*** Premature EOF: expected %d rows, got %d\n",rows, n-1);
							found_EOF = 1;
							break;
						}

						write_one_line(c_cscanline[n_s]+1, c_columns[n_s], c_out[n_s]);

						tot_out += c_columns[n_s];

						/* extend the edges */
						c_cscanline[n_s][c_columns[n_s]+1] = c_cscanline[n_s][c_columns[n_s]];

						/* make the current scanline the previous one */
						c_swaplines(n_s);

						/* Take out the Restart Markers */
						if (got_restart)
						{
							/* Look for restart markers only after a restart interval */
							if ((MCUs_counted % restart_interval) == 0)
							{
								bitiflush();
								read_n_bytes(in, 2);	/* read the RST marker */
								bitiinit();
							}
							MCUs_counted++;

						}

					}	/* End of line loop in PLANE_INT */

			}	/* End of each component for PLANE_INT */

		}	/* End of non LINE_INT */

		bitiflush();

	} /* End of loop for scans */


	mk = 0;

	/* Read EOI */
	seek_return=seek_marker(in,&mk);
	if (seek_return==EOF)
	{
		fprintf(stderr,"Did not get EOI at end of compressed image\n");
		exit(10);
	}
	if ( seek_return > 2 )
	{
		fprintf(msgfile,"*** WARNING: %d extra bytes between end of scan and next marker.\n",seek_return-2);
		fprintf(msgfile,"***          Added to marker segment count.\n");
	}

	pos0 += seek_return;
	if (mk != EOI)
	{
		fprintf(stderr,"In this implementation last marker must be EOI\n");
		exit(10);
	}

	if (head_scan[0]->need_table)
		fprintf(msgfile,"A mapping table was used which had %i entries of %i bytes each.\n",head_scan[0]->MAXTAB, head_scan[0]->Wt);

	if (got_restart)
		fprintf(msgfile,"Restart markers were found with a restart interval of %i.\n",restart_interval);

	if ( verbose )
		fprintf(msgfile,"Marker segment bytes: %ld\n",pos0);

	/* position in input file */
	pos1 = ftell(in);
	/* tot_in = 8*(pos1-pos0); */

	/* size of compressed file read (bits), incl. headers. */
	tot_in = 8*pos1;

	/* Close down */
	close_process_run();
	closebuffers(multi);


	t1 = get_utime();
	fprintf(msgfile,"Total bits  in: %ld  Symbols out: %ld  %5.3lf bps\n",
		tot_in,tot_out,tot_in/(double)tot_out);
	fprintf(msgfile,"Time = %1.3lf secs : %1.0lf KSymbols/sec\n",t1-t0,
		(tot_out)/(1024*(t1-t0)));

	if ( found_EOF )
		exit(0);
	else
		return 1;
}




usage()
{
	fprintf(stderr,"Usage: %s [flags] [infile] [outfile1 [outfile2, ...]]\n\
				   DEFAULTS:\n\
				   infile   = %s.\n\
				   outfile1 = %s for color image in a single (PPM) output file.\n\
				   outfile1 = %s for monochrome image in a single (PGM) output file.\n\
				   outfile[1,2,...] = %s for multiple (PGM) output files \n\
				   in plane or line interleaved modes.\n",
				   "locod", "specified JLS file", OUTFILE ".out", 
				   OUTFILE "1.out",
				   OUTFILE "[1,2,...].out");
	fprintf(stderr,"FLAGS:\n\
				   outfile2, ... : Multiple output specification for plane or line int. mode.\n\
				   -i<infile>    : Alternate input specification, use -i- for stdin.\n\
				   -o<outfile>   : Alternate output specification, use -o- for stdout.\n\
				   -P            : Generate single (.ppm) output file for sample/line int. mode.\n\
				   ");
	fprintf(stderr,"\
				   -h            : Print this help.\n\
				   *** No spaces allowed between a flag and its argument.\n\
				   ");

}


bad_flag(char *s)
{
	fprintf(stderr,"Bad flag %s\n",s);
	usage();
	exit(10);
}