Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | RSS feed

  1. /*
  2.  * rdswitch.c
  3.  *
  4.  * Copyright (C) 1991-1996, Thomas G. Lane.
  5.  * This file is part of the Independent JPEG Group's software.
  6.  * For conditions of distribution and use, see the accompanying README file.
  7.  *
  8.  * This file contains routines to process some of cjpeg's more complicated
  9.  * command-line switches.  Switches processed here are:
  10.  *      -qtables file           Read quantization tables from text file
  11.  *      -scans file             Read scan script from text file
  12.  *      -qslots N[,N,...]       Set component quantization table selectors
  13.  *      -sample HxV[,HxV,...]   Set component sampling factors
  14.  */
  15.  
  16. #include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
  17. #include <ctype.h>              /* to declare isdigit(), isspace() */
  18.  
  19.  
  20. LOCAL(int)
  21. text_getc (FILE * file)
  22. /* Read next char, skipping over any comments (# to end of line) */
  23. /* A comment/newline sequence is returned as a newline */
  24. {
  25.   register int ch;
  26.  
  27.   ch = getc(file);
  28.   if (ch == '#') {
  29.     do {
  30.       ch = getc(file);
  31.     } while (ch != '\n' && ch != EOF);
  32.   }
  33.   return ch;
  34. }
  35.  
  36.  
  37. LOCAL(boolean)
  38. read_text_integer (FILE * file, long * result, int * termchar)
  39. /* Read an unsigned decimal integer from a file, store it in result */
  40. /* Reads one trailing character after the integer; returns it in termchar */
  41. {
  42.   register int ch;
  43.   register long val;
  44.  
  45.   /* Skip any leading whitespace, detect EOF */
  46.   do {
  47.     ch = text_getc(file);
  48.     if (ch == EOF) {
  49.       *termchar = ch;
  50.       return FALSE;
  51.     }
  52.   } while (isspace(ch));
  53.  
  54.   if (! isdigit(ch)) {
  55.     *termchar = ch;
  56.     return FALSE;
  57.   }
  58.  
  59.   val = ch - '0';
  60.   while ((ch = text_getc(file)) != EOF) {
  61.     if (! isdigit(ch))
  62.       break;
  63.     val *= 10;
  64.     val += ch - '0';
  65.   }
  66.   *result = val;
  67.   *termchar = ch;
  68.   return TRUE;
  69. }
  70.  
  71.  
  72. GLOBAL(boolean)
  73. read_quant_tables (j_compress_ptr cinfo, char * filename,
  74.                    int scale_factor, boolean force_baseline)
  75. /* Read a set of quantization tables from the specified file.
  76.  * The file is plain ASCII text: decimal numbers with whitespace between.
  77.  * Comments preceded by '#' may be included in the file.
  78.  * There may be one to NUM_QUANT_TBLS tables in the file, each of 64 values.
  79.  * The tables are implicitly numbered 0,1,etc.
  80.  * NOTE: does not affect the qslots mapping, which will default to selecting
  81.  * table 0 for luminance (or primary) components, 1 for chrominance components.
  82.  * You must use -qslots if you want a different component->table mapping.
  83.  */
  84. {
  85.   FILE * fp;
  86.   int tblno, i, termchar;
  87.   long val;
  88.   unsigned int table[DCTSIZE2];
  89.  
  90.   if ((fp = fopen(filename, "r")) == NULL) {
  91.     fprintf(stderr, "Can't open table file %s\n", filename);
  92.     return FALSE;
  93.   }
  94.   tblno = 0;
  95.  
  96.   while (read_text_integer(fp, &val, &termchar)) { /* read 1st element of table */
  97.     if (tblno >= NUM_QUANT_TBLS) {
  98.       fprintf(stderr, "Too many tables in file %s\n", filename);
  99.       fclose(fp);
  100.       return FALSE;
  101.     }
  102.     table[0] = (unsigned int) val;
  103.     for (i = 1; i < DCTSIZE2; i++) {
  104.       if (! read_text_integer(fp, &val, &termchar)) {
  105.         fprintf(stderr, "Invalid table data in file %s\n", filename);
  106.         fclose(fp);
  107.         return FALSE;
  108.       }
  109.       table[i] = (unsigned int) val;
  110.     }
  111.     jpeg_add_quant_table(cinfo, tblno, table, scale_factor, force_baseline);
  112.     tblno++;
  113.   }
  114.  
  115.   if (termchar != EOF) {
  116.     fprintf(stderr, "Non-numeric data in file %s\n", filename);
  117.     fclose(fp);
  118.     return FALSE;
  119.   }
  120.  
  121.   fclose(fp);
  122.   return TRUE;
  123. }
  124.  
  125.  
  126. #ifdef C_MULTISCAN_FILES_SUPPORTED
  127.  
  128. LOCAL(boolean)
  129. read_scan_integer (FILE * file, long * result, int * termchar)
  130. /* Variant of read_text_integer that always looks for a non-space termchar;
  131.  * this simplifies parsing of punctuation in scan scripts.
  132.  */
  133. {
  134.   register int ch;
  135.  
  136.   if (! read_text_integer(file, result, termchar))
  137.     return FALSE;
  138.   ch = *termchar;
  139.   while (ch != EOF && isspace(ch))
  140.     ch = text_getc(file);
  141.   if (isdigit(ch)) {            /* oops, put it back */
  142.     if (ungetc(ch, file) == EOF)
  143.       return FALSE;
  144.     ch = ' ';
  145.   } else {
  146.     /* Any separators other than ';' and ':' are ignored;
  147.      * this allows user to insert commas, etc, if desired.
  148.      */
  149.     if (ch != EOF && ch != ';' && ch != ':')
  150.       ch = ' ';
  151.   }
  152.   *termchar = ch;
  153.   return TRUE;
  154. }
  155.  
  156.  
  157. GLOBAL(boolean)
  158. read_scan_script (j_compress_ptr cinfo, char * filename)
  159. /* Read a scan script from the specified text file.
  160.  * Each entry in the file defines one scan to be emitted.
  161.  * Entries are separated by semicolons ';'.
  162.  * An entry contains one to four component indexes,
  163.  * optionally followed by a colon ':' and four progressive-JPEG parameters.
  164.  * The component indexes denote which component(s) are to be transmitted
  165.  * in the current scan.  The first component has index 0.
  166.  * Sequential JPEG is used if the progressive-JPEG parameters are omitted.
  167.  * The file is free format text: any whitespace may appear between numbers
  168.  * and the ':' and ';' punctuation marks.  Also, other punctuation (such
  169.  * as commas or dashes) can be placed between numbers if desired.
  170.  * Comments preceded by '#' may be included in the file.
  171.  * Note: we do very little validity checking here;
  172.  * jcmaster.c will validate the script parameters.
  173.  */
  174. {
  175.   FILE * fp;
  176.   int scanno, ncomps, termchar;
  177.   long val;
  178.   jpeg_scan_info * scanptr;
  179. #define MAX_SCANS  100          /* quite arbitrary limit */
  180.   jpeg_scan_info scans[MAX_SCANS];
  181.  
  182.   if ((fp = fopen(filename, "r")) == NULL) {
  183.     fprintf(stderr, "Can't open scan definition file %s\n", filename);
  184.     return FALSE;
  185.   }
  186.   scanptr = scans;
  187.   scanno = 0;
  188.  
  189.   while (read_scan_integer(fp, &val, &termchar)) {
  190.     if (scanno >= MAX_SCANS) {
  191.       fprintf(stderr, "Too many scans defined in file %s\n", filename);
  192.       fclose(fp);
  193.       return FALSE;
  194.     }
  195.     scanptr->component_index[0] = (int) val;
  196.     ncomps = 1;
  197.     while (termchar == ' ') {
  198.       if (ncomps >= MAX_COMPS_IN_SCAN) {
  199.         fprintf(stderr, "Too many components in one scan in file %s\n",
  200.                 filename);
  201.         fclose(fp);
  202.         return FALSE;
  203.       }
  204.       if (! read_scan_integer(fp, &val, &termchar))
  205.         goto bogus;
  206.       scanptr->component_index[ncomps] = (int) val;
  207.       ncomps++;
  208.     }
  209.     scanptr->comps_in_scan = ncomps;
  210.     if (termchar == ':') {
  211.       if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
  212.         goto bogus;
  213.       scanptr->Ss = (int) val;
  214.       if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
  215.         goto bogus;
  216.       scanptr->Se = (int) val;
  217.       if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
  218.         goto bogus;
  219.       scanptr->Ah = (int) val;
  220.       if (! read_scan_integer(fp, &val, &termchar))
  221.         goto bogus;
  222.       scanptr->Al = (int) val;
  223.     } else {
  224.       /* set non-progressive parameters */
  225.       scanptr->Ss = 0;
  226.       scanptr->Se = DCTSIZE2-1;
  227.       scanptr->Ah = 0;
  228.       scanptr->Al = 0;
  229.     }
  230.     if (termchar != ';' && termchar != EOF) {
  231. bogus:
  232.       fprintf(stderr, "Invalid scan entry format in file %s\n", filename);
  233.       fclose(fp);
  234.       return FALSE;
  235.     }
  236.     scanptr++, scanno++;
  237.   }
  238.  
  239.   if (termchar != EOF) {
  240.     fprintf(stderr, "Non-numeric data in file %s\n", filename);
  241.     fclose(fp);
  242.     return FALSE;
  243.   }
  244.  
  245.   if (scanno > 0) {
  246.     /* Stash completed scan list in cinfo structure.
  247.      * NOTE: for cjpeg's use, JPOOL_IMAGE is the right lifetime for this data,
  248.      * but if you want to compress multiple images you'd want JPOOL_PERMANENT.
  249.      */
  250.     scanptr = (jpeg_scan_info *)
  251.       (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
  252.                                   scanno * SIZEOF(jpeg_scan_info));
  253.     MEMCOPY(scanptr, scans, scanno * SIZEOF(jpeg_scan_info));
  254.     cinfo->scan_info = scanptr;
  255.     cinfo->num_scans = scanno;
  256.   }
  257.  
  258.   fclose(fp);
  259.   return TRUE;
  260. }
  261.  
  262. #endif /* C_MULTISCAN_FILES_SUPPORTED */
  263.  
  264.  
  265. GLOBAL(boolean)
  266. set_quant_slots (j_compress_ptr cinfo, char *arg)
  267. /* Process a quantization-table-selectors parameter string, of the form
  268.  *     N[,N,...]
  269.  * If there are more components than parameters, the last value is replicated.
  270.  */
  271. {
  272.   int val = 0;                  /* default table # */
  273.   int ci;
  274.   char ch;
  275.  
  276.   for (ci = 0; ci < MAX_COMPONENTS; ci++) {
  277.     if (*arg) {
  278.       ch = ',';                 /* if not set by sscanf, will be ',' */
  279.       if (sscanf(arg, "%d%c", &val, &ch) < 1)
  280.         return FALSE;
  281.       if (ch != ',')            /* syntax check */
  282.         return FALSE;
  283.       if (val < 0 || val >= NUM_QUANT_TBLS) {
  284.         fprintf(stderr, "JPEG quantization tables are numbered 0..%d\n",
  285.                 NUM_QUANT_TBLS-1);
  286.         return FALSE;
  287.       }
  288.       cinfo->comp_info[ci].quant_tbl_no = val;
  289.       while (*arg && *arg++ != ',') /* advance to next segment of arg string */
  290.         ;
  291.     } else {
  292.       /* reached end of parameter, set remaining components to last table */
  293.       cinfo->comp_info[ci].quant_tbl_no = val;
  294.     }
  295.   }
  296.   return TRUE;
  297. }
  298.  
  299.  
  300. GLOBAL(boolean)
  301. set_sample_factors (j_compress_ptr cinfo, char *arg)
  302. /* Process a sample-factors parameter string, of the form
  303.  *     HxV[,HxV,...]
  304.  * If there are more components than parameters, "1x1" is assumed for the rest.
  305.  */
  306. {
  307.   int ci, val1, val2;
  308.   char ch1, ch2;
  309.  
  310.   for (ci = 0; ci < MAX_COMPONENTS; ci++) {
  311.     if (*arg) {
  312.       ch2 = ',';                /* if not set by sscanf, will be ',' */
  313.       if (sscanf(arg, "%d%c%d%c", &val1, &ch1, &val2, &ch2) < 3)
  314.         return FALSE;
  315.       if ((ch1 != 'x' && ch1 != 'X') || ch2 != ',') /* syntax check */
  316.         return FALSE;
  317.       if (val1 <= 0 || val1 > 4 || val2 <= 0 || val2 > 4) {
  318.         fprintf(stderr, "JPEG sampling factors must be 1..4\n");
  319.         return FALSE;
  320.       }
  321.       cinfo->comp_info[ci].h_samp_factor = val1;
  322.       cinfo->comp_info[ci].v_samp_factor = val2;
  323.       while (*arg && *arg++ != ',') /* advance to next segment of arg string */
  324.         ;
  325.     } else {
  326.       /* reached end of parameter, set remaining components to 1x1 sampling */
  327.       cinfo->comp_info[ci].h_samp_factor = 1;
  328.       cinfo->comp_info[ci].v_samp_factor = 1;
  329.     }
  330.   }
  331.   return TRUE;
  332. }
  333.