jpegtran

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Program JpegTran;
 
{ This file contains a command-line user interface for JPEG transcoding.
  It is very similar to cjpeg.c, but provides lossless transcoding between
  different JPEG file formats. } 
{ Original: jpegtran.c ; Copyright (C) 1995-1996, Thomas G. Lane. }
 
{$define TWO_FILE_COMMANDLINE}
 {$I jconfig.inc}
 
uses
  jdeferr,
  jerror,  jmorecfg,
  jpeglib,
  cdjpeg,       { Common decls for cjpeg/djpeg applications }
  jdatasrc, JDatadst, transupp, JCTrans, JDtrans,
  JdAPImin, JcAPImin, JcParam,  RdSwitch;
 
 
{ Argument-parsing code.
  The switch parser is designed to be useful with DOS-style command line  syntax, ie, intermixed switches and file names, where only the switches
  to the left of a given file name affect processing of that file.
  The main program in this file doesn't actually use this capability... }
 
 var
  progname,             { program name for error messages }
  outfilename : string; { for -outfile switch }
  copyoption : JCOPY_OPTION;                  { -copy switch }
  transformoption : jpeg_transform_info; { image transformation options } 
procedure Stop(errcode : int);
begin
  Halt(errcode);
end; 
{LOCAL}
procedure usage;
{ complain about bad command line }
begin  Write(output, 'usage: ',progname,' [switches] ');
{$ifdef TWO_FILE_COMMANDLINE}
  WriteLn(output, 'inputfile outputfile');
{$else}
  WriteLn(output, '[inputfile]');{$endif}
 
  WriteLn(output, 'Switches (names may be abbreviated):');
  WriteLn('  -copy none     Copy no extra markers from source file');
  WriteLn('  -copy comments Copy only comment markers (default)');  WriteLn('  -copy all      Copy all extra markers');
{$ifdef ENTROPY_OPT_SUPPORTED}
  WriteLn('  -optimize      Optimize Huffman table (smaller file, but slow compression)');
{$endif}
{$ifdef C_PROGRESSIVE_SUPPORTED}  WriteLn('  -progressive   Create progressive JPEG file');
{$endif}
{$ifdef TRANSFORMS_SUPPORTED}
  WriteLn('Switches for modifying the image:');
  WriteLn('  -grayscale     Reduce to grayscale (omit color data)');  WriteLn('  -flip [horizontal|vertical]  Mirror image (left-right or top-bottom)');
  WriteLn('  -rotate [90|180|270]         Rotate image (degrees clockwise)');
  WriteLn('  -transpose     Transpose image');
  WriteLn('  -transverse    Transverse transpose image');
  WriteLn('  -trim          Drop non-transformable edge blocks');  {$ifdef CROP_SUPPORTED}
  WriteLn('  -cut WxH+X+Y   Cut out a subset of the image');
  {$endif}
{$endif} { TRANSFORMS_SUPPORTED }
  WriteLn('Switches for advanced users:');  WriteLn('  -restart N     Set restart interval in rows, or in blocks with B');
  WriteLn('  -maxmemory N   Maximum memory to use (in kbytes)');
  WriteLn('  -outfile name  Specify name for output file');
  WriteLn('  -verbose  or  -debug   Emit debug output');
  WriteLn('Switches for wizards:');{$ifdef C_ARITH_CODING_SUPPORTED}
  WriteLn('  -arithmetic    Use arithmetic coding');
{$endif}
{$ifdef C_MULTISCAN_FILES_SUPPORTED}
  WriteLn('  -scans file    Create multi-scan JPEG per script file');{$endif}
  Stop(EXIT_FAILURE);
end;
 
{LOCAL}procedure select_transform (transform : JXFORM_CODE);
{ Silly little routine to detect multiple transform options,
  which we can't handle. }
 
begin{$ifdef TRANSFORMS_SUPPORTED}
  if (transformoption.transform = JXFORM_NONE) or
     (transformoption.transform = transform) then
    transformoption.transform := transform
  else  begin
    WriteLn(progname, ': can only do one image transformation at a time');
    usage;
  end;
{$else}  WriteLn(progname, ': sorry, image transformation was not compiled');
  exit(EXIT_FAILURE);
{$endif}
end;
 {LOCAL}
function parse_switches (cinfo : j_compress_ptr;
                         last_file_arg_seen: int;
                         for_real : boolean ) : int;
const  printed_version : boolean = FALSE;
 
{ Parse optional switches.
  Returns argv[] index of first file-name argument (= argc if none).
  Any file names with indexes <= last_file_arg_seen are ignored;  they have presumably been processed in a previous iteration.
  (Pass 0 for last_file_arg_seen on the first or only iteration.)
  for_real is FALSE on the first (dummy) pass; we may skip any expensive
  processing. }
var  argn,
  argc : int;
  arg : string;
 
  simple_progressive : boolean;const
  scansarg : string = '';       { saves -scans parm if any }
var
  lval : long;
  ch : char;  code : integer;
begin
  { Set up default JPEG parameters. }
  simple_progressive := FALSE;
  outfilename := '';  cinfo^.err^.trace_level := 0;
  copyoption := JCOPYOPT_DEFAULT;
  transformoption.transform := JXFORM_NONE;
  transformoption.trim := FALSE;
  transformoption.force_grayscale := FALSE;  cinfo^.err^.trace_level := 0;
 
  { Scan command line options, adjust parameters }
 
  argn := 0;  argc := ParamCount;
 
  while argn < argc do
  begin
    Inc(argn);    arg := ParamStr(argn);
    if (arg[1] <> '-') then
    begin
      { Not a switch, must be a file name argument }
      if (argn <= last_file_arg_seen) then      begin
        outfilename := '';      { -outfile applies to just one input file }
        continue;               { ignore this name if previously processed }
      end;
      break;                    { else done parsing switches }    end;
    {Inc(arg);                  - advance past switch marker character }
 
    if (keymatch(arg, '-arithmetic', 1)) then
    begin      { Use arithmetic coding. }
{$ifdef C_ARITH_CODING_SUPPORTED}
      cinfo^.arith_code := TRUE;
{$else}
      WriteLn(output, progname, ': sorry, arithmetic coding not supported');      Stop(EXIT_FAILURE);
{$endif}
    end
    else
      if keymatch(arg, '-copy', 2) then      begin { Select which extra markers to copy. }
        Inc(argn);
        if (argn >= argc) then          { advance to next argument }
          usage;
        if (keymatch(ParamStr(argn), 'none', 1)) then          copyoption := JCOPYOPT_NONE
        else
          if (keymatch(ParamStr(argn), 'comments', 1)) then
            copyoption := JCOPYOPT_COMMENTS
          else            if (keymatch(ParamStr(argn), 'all', 1)) then
              copyoption := JCOPYOPT_ALL
            else
              usage;
      end      else
        if keymatch(arg, '-debug', 2) or keymatch(arg, '-verbose', 2) then
        begin
        { Enable debug printouts. }
        { On first -d, print version identification } 
        if (not printed_version) then
        begin
          WriteLn('PASJPEG Group''s JPEGTRAN translation version ',
                  JVERSION, JCOPYRIGHT, JNOTICE);          printed_version := TRUE;
        end;
        Inc(cinfo^.err^.trace_level);
      end
      else  {$ifdef CROP_SUPPORTED}
        if keymatch(arg, '-cut', 2) then
        begin
        { Cut out a region of the image specified by an X geometry-like string }
        p : PChar; 
          Inc(argn);
          if (argn >= argc) then
            usage;
          select_transform(JXFORM_CUT); 
          arg := ParamStr(argn);
                  px := Pos('x', arg);
                  if ( px = 'x') then
                    usage;                  arg_w := Copy(arg, 1, px-1);
                  Val(arg_w, lval, code);
                  if (code <> 0) then
                    usage;
           transformoption.newwidth := lval;
                  arg_w := Copy(arg, px+1, Length(arg));
                  Val(arg_w, lval, code);
                  if (code <> 0) then
                    usage; 
          transformoption.newheight := lval;
          if (p^ <> '+') and (p^ <> '-') then
            usage;
                  arg_w := Copy(arg, px+1, Length(arg));                  Val(arg_w, lval, code);
                  if (code <> 0) then
                    usage;
 
          transformoption.xoffs := lval;                  arg_w := Copy(arg, px+1, Length(arg));
                  Val(arg_w, lval, code);
                  if (code <> 0) then
                    usage;
           if (p^ <> '+') and (p^ <> '-') then
            usage;
          transformoption.yoffs := lval;
 
          if (transformoption.newwidth=0) or (transformoption.newheight=0) then          begin
            WriteLn(progname,': degenerate -cut size in ', argv[argn]);
            exit(EXIT_FAILURE);
          end
        end        else
  {$endif}
          if keymatch(arg, '-flip', 2) then
          begin { Mirror left-right or top-bottom. }
            Inc(argn);            if (argn >= argc) then        { advance to next argument }
              usage;
            if keymatch(ParamStr(argn), 'horizontal', 2) then
              select_transform(JXFORM_FLIP_H)
            else              if keymatch(ParamStr(argn), 'vertical', 2) then
                select_transform(JXFORM_FLIP_V)
              else
                usage;
          end          else
            if keymatch(arg, '-grayscale', 2) or
               keymatch(arg, '-greyscale',2) then
            begin  { Force to grayscale. }
  {$ifdef TRANSFORMS_SUPPORTED}              transformoption.force_grayscale := TRUE;
  {$else}
              select_transform(JXFORM_NONE);    { force an error }
  {$endif}
            end            else
              if keymatch(arg, '-maxmemory', 4) then
              begin
              { Maximum memory in Kb (or Mb with 'm'). }
                ch := 'x'; 
                Inc(argn);
                if (argn >= argc) then  { advance to next argument }
                  usage;
                 arg := ParamStr(argn);
                if (length(arg) > 1) and (arg[length(arg)] in ['m','M']) then
                begin
                  ch := arg[length(arg)];
                  arg := Copy(arg, 1, Length(arg)-1);                end;
                Val(arg, lval, code);
                if (code <> 0) then
                  usage;
                if (ch = 'm') or (ch = 'M') then                  lval := lval * long(1000);
                cinfo^.mem^.max_memory_to_use := lval * long(1000);
              end
              else
                if keymatch(arg, '-optimize', 2) or                   keymatch(arg, '-optimise', 2) then
                begin
                  { Enable entropy parm optimization. }
      {$ifdef ENTROPY_OPT_SUPPORTED}
                  cinfo^.optimize_coding := TRUE;      {$else}
                  WriteLn(output, progname,
                    ': sorry, entropy optimization was not compiled');
                  Stop(EXIT_FAILURE);
      {$endif} 
                end
                else
                  if keymatch(arg, '-outfile', 5) then
                  begin                    { Set output file name. }
                    Inc(argn);
                    if (argn >= argc) then      { advance to next argument }
                      usage;
                    outfilename := ParamStr(argn);      { save it away for later use }                  end
                  else
                    if keymatch(arg, '-progressive', 2) then
                    begin
                      { Select simple progressive mode. }  {$ifdef C_PROGRESSIVE_SUPPORTED}
                      simple_progressive := TRUE;
                      { We must postpone execution until num_components is known. }
  {$else}
                      WriteLn(output, progname,                        ': sorry, progressive output was not compiled');
                      Stop(EXIT_FAILURE);
  {$endif}
                    end
                    else                      if keymatch(arg, '-restart', 2) then
                      begin
                        ch := 'x';
                        { Restart interval in MCU rows (or in MCUs with 'b'). }
                        Inc(argn);                        if (argn >= argc) then { advance to next argument }
                          usage;
                        arg := ParamStr(argn);
                        if (length(arg) > 1) and (arg[length(arg)] in ['b','B']) then
                        begin                          ch := arg[length(arg)];
                          arg := Copy(arg, 1, Length(arg)-1);
                        end;
 
                        Val(arg, lval, code);                        if (code <> 1) or (lval < 0) or (lval > Long(65535)) then
                          usage;
 
                        if (ch = 'b') or (ch = 'B') then
                        begin                          cinfo^.restart_interval := uint(lval);
                          cinfo^.restart_in_rows := 0; { else prior '-restart n' overrides me }
                        end
                        else
                        begin                          cinfo^.restart_in_rows := int(lval);
                          { restart_interval will be computed during startup }
                        end;
 
                      end                      else
                        if keymatch(arg, '-rotate', 3) then
                        begin { Rotate 90, 180, or 270 degrees (measured clockwise). }
                          Inc(argn);
                          if (argn >= argc)     then { advance to next argument }                            usage;
                          if (keymatch(ParamStr(argn), '90', 2)) then
                            select_transform(JXFORM_ROT_90)
                          else
                            if keymatch(ParamStr(argn), '180', 3) then                              select_transform(JXFORM_ROT_180)
                            else
                              if keymatch(ParamStr(argn), '270', 3) then
                                select_transform(JXFORM_ROT_270)
                              else                                usage;
                         end
                         else
                         if keymatch(arg, '-scans', 2) then
                         begin                           { Set scan script. }
         {$ifdef C_MULTISCAN_FILES_SUPPORTED}
                           Inc(argn);
                           if (argn >= argc) then       { advance to next argument }
                             usage;                           scansarg := ParamStr(argn);
                           { We must postpone reading the file in case -progressive appears. }
         {$else}
                           WriteLn(output, progname,
                             ': sorry, multi-scan output was not compiled');                           Stop(EXIT_FAILURE);
         {$endif}
                         end
                         else
                           if keymatch(arg, '-transpose', 2) then                             { Transpose (across UL-to-LR axis). }
                             select_transform(JXFORM_TRANSPOSE)
                           else
                             if keymatch(arg, '-transverse', 7) then
                               { Transverse transpose (across UR-to-LL axis). }                               select_transform(JXFORM_TRANSVERSE)
                             else
                               if keymatch(arg, '-trim', 4) then
                                 { Trim off any partial edge MCUs that
                                   the transform can't handle. }                                 transformoption.trim := TRUE
                               else
                                 usage;                { bogus switch }
  end;
   { Post-switch-scanning cleanup }
 
  if (for_real) then
  begin
 {$ifdef C_PROGRESSIVE_SUPPORTED}
    if (simple_progressive) then { process -progressive; -scans can override }
      jpeg_simple_progression(cinfo);
{$endif}
 {$ifdef C_MULTISCAN_FILES_SUPPORTED}
    if (scansarg <> '') then       { process -scans if it was present }
    begin
      WriteLn('Scripts are not supported in PasJPEG.');
      {if not read_scan_script(cinfo, scansarg) then        usage;
      }
    end;
{$endif}
  end; 
  parse_switches  := argn;      { return index of next arg (file name) }
end;
 
 { The main program. }
 
{main (int argc, char **argv)}
var
  srcinfo : jpeg_decompress_struct;  dstinfo : jpeg_compress_struct;
  jsrcerr, jdsterr : jpeg_error_mgr;
{$ifdef PROGRESS_REPORT}
  progress : cdjpeg_progress_mgr;
{$endif}  src_coef_arrays,
  dst_coef_arrays : jvirt_barray_tbl_ptr;
  file_index : int;
  input_file : FILE;
  output_file : FILE;begin
  { On Mac, fetch a command line. }
{$ifdef USE_CCOMMAND}
  argc := ccommand(@argv);
{$endif} 
  progname := ParamStr(0);
 
  { Initialize the JPEG decompression object with default error handling. }
  srcinfo.err := jpeg_std_error(jsrcerr);  jpeg_create_decompress(@srcinfo);
  { Initialize the JPEG compression object with default error handling. }
  dstinfo.err := jpeg_std_error(jdsterr);
  jpeg_create_compress(@dstinfo);
   { Now safe to enable signal catcher.
    Note: we assume only the decompression object will have virtual arrays. }
 
{$ifdef NEED_SIGNAL_CATCHER}
  enable_signal_catcher(j_common_ptr(@srcinfo));{$endif}
 
  { Scan command line to find file names.
    It is convenient to use just one switch-parsing routine, but the switch
    values read here are mostly ignored; we will rescan the switches after    opening the input file.  Also note that most of the switches affect the
    destination JPEG object, so we parse into that and then copy over what
    needs to affects the source too. }
 
  file_index := parse_switches(@dstinfo, 0, FALSE);  jsrcerr.trace_level := jdsterr.trace_level;
  srcinfo.mem^.max_memory_to_use := dstinfo.mem^.max_memory_to_use;
 
{$ifdef TWO_FILE_COMMANDLINE}
  { Must have either -outfile switch or explicit output file name }  if (outfilename = '') then
  begin
    if (file_index <> ParamCount-1) then
    begin
      WriteLn(output, progname, ': must name one input and one output file');      usage;
    end;
    outfilename := ParamStr(file_index+1);
  end
  else  begin
    if (file_index <> ParamCount-1) then
    begin
      WriteLn(output, progname, ': must name one input and one output file');
      usage;    end;
  end;
{$else}
  { Unix style: expect zero or one file name }
  if (file_index < argc-1) then  begin
    WriteLn(output, progname, ': only one input file');
    usage;
  end;
{$endif} { TWO_FILE_COMMANDLINE } 
  { Open the input file. }
  if (file_index < ParamCount) then
  begin
    assign(input_file, ParamStr(file_index));    {$I-}
    reset(input_file, 1);
    {$IFDEF IoCheck} {$I+} {$ENDIF}
    if (IOresult <> 0) then
    begin      WriteLn(output, progname, ': can''t open ', ParamStr(file_index));
      Stop(EXIT_FAILURE);
    end;
  end
  else  begin
    { default input file is stdin }
    assign(input_file, '');
    reset(input_file, 1);
  end; 
  { Open the output file. }
  if (outfilename <> '') then
  begin
    assign(output_file, outfilename);    {$I-}
    rewrite(output_file, 1);
    {$IFDEF IoCheck} {$I+} {$ENDIF}
    if (IOresult <> 0) then
    begin      WriteLn(output, progname, ': can''t open ', outfilename);
      Stop(EXIT_FAILURE);
    end;
  end
  else  begin
    { default output file is stdout }
    assign(output_file, '');
    rewrite(output_file, 1);
  end; 
{$ifdef PROGRESS_REPORT}
  start_progress_monitor(j_common_ptr(@dstinfo), @progress);
{$endif}
   { Specify data source for decompression }
  jpeg_stdio_src(@srcinfo, @input_file);
 
  { Enable saving of extra markers that we want to copy }
  jcopy_markers_setup(@srcinfo, copyoption); 
  { Read file header }
  {void} jpeg_read_header(@srcinfo, TRUE);
 
  { Any space needed by a transform option must be requested before    jpeg_read_coefficients so that memory allocation will be done right. }
 
{$ifdef TRANSFORMS_SUPPORTED}
  jtransform_request_workspace(@srcinfo, transformoption);
{$endif} 
  { Read source file as DCT coefficients }
  src_coef_arrays := jpeg_read_coefficients(@srcinfo);
 
  { Initialize destination compression parameters from source values }  jpeg_copy_critical_parameters(@srcinfo, @dstinfo);
 
  { Adjust destination parameters if required by transform options;
    also find out which set of coefficient arrays will hold the output. }
 {$ifdef TRANSFORMS_SUPPORTED}
  dst_coef_arrays := jtransform_adjust_parameters(@srcinfo, @dstinfo,
                                                 src_coef_arrays,
                                                 transformoption);
{$else}  dst_coef_arrays := src_coef_arrays;
{$endif}
 
  { Adjust default compression parameters by re-parsing the options }
  file_index := parse_switches(@dstinfo, 0, TRUE); 
  { Specify data destination for compression }
  jpeg_stdio_dest(@dstinfo, @output_file);
 
  { Start compressor (note no image data is actually written here) }  jpeg_write_coefficients(@dstinfo, dst_coef_arrays);
 
  { Copy to the output file any extra markers that we want to preserve }
  jcopy_markers_execute(@srcinfo, @dstinfo, copyoption);
   { Execute image transformation, if any }
{$ifdef TRANSFORMS_SUPPORTED}
  jtransform_execute_transformation(@srcinfo, @dstinfo,
                                    src_coef_arrays,
                                    transformoption);{$endif}
 
  { Finish compression and release memory }
  jpeg_finish_compress(@dstinfo);
  jpeg_destroy_compress(@dstinfo);  {void} jpeg_finish_decompress(@srcinfo);
  jpeg_destroy_decompress(@srcinfo);
 
  { Close files, if we opened them }
  close(input_file);  close(output_file);
 
{$ifdef PROGRESS_REPORT}
  end_progress_monitor(j_common_ptr(@dstinfo));
{$endif} 
  { All done. }
  if jsrcerr.num_warnings + jdsterr.num_warnings <> 0 then
    Stop(EXIT_WARNING)
  else    Stop(EXIT_SUCCESS);
end.

Punto importante: Si vas a sugerir un segmento de código en algún lenguaje debes hacerlo así:

  • Si es lenguaje C <code lang="c">Código en C</code>
  • Si es lenguaje Pascal <code lang="pascal">Aquí dentro el código de Pascal</code>.

De esta manera el código coloreas el código.

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