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/src/FreeImage/Source/LibJPEG/rdswitch.c

https://bitbucket.org/cabalistic/ogredeps/
C | 365 lines | 258 code | 36 blank | 71 comment | 100 complexity | b71cdc92f9685701ead2cd69e03f99bb MD5 | raw file
  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 *	-quality N[,N,...]	Set quality ratings
 13 *	-qslots N[,N,...]	Set component quantization table selectors
 14 *	-sample HxV[,HxV,...]	Set component sampling factors
 15 */
 16
 17#include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */
 18#include <ctype.h>		/* to declare isdigit(), isspace() */
 19
 20
 21LOCAL(int)
 22text_getc (FILE * file)
 23/* Read next char, skipping over any comments (# to end of line) */
 24/* A comment/newline sequence is returned as a newline */
 25{
 26  register int ch;
 27  
 28  ch = getc(file);
 29  if (ch == '#') {
 30    do {
 31      ch = getc(file);
 32    } while (ch != '\n' && ch != EOF);
 33  }
 34  return ch;
 35}
 36
 37
 38LOCAL(boolean)
 39read_text_integer (FILE * file, long * result, int * termchar)
 40/* Read an unsigned decimal integer from a file, store it in result */
 41/* Reads one trailing character after the integer; returns it in termchar */
 42{
 43  register int ch;
 44  register long val;
 45  
 46  /* Skip any leading whitespace, detect EOF */
 47  do {
 48    ch = text_getc(file);
 49    if (ch == EOF) {
 50      *termchar = ch;
 51      return FALSE;
 52    }
 53  } while (isspace(ch));
 54  
 55  if (! isdigit(ch)) {
 56    *termchar = ch;
 57    return FALSE;
 58  }
 59
 60  val = ch - '0';
 61  while ((ch = text_getc(file)) != EOF) {
 62    if (! isdigit(ch))
 63      break;
 64    val *= 10;
 65    val += ch - '0';
 66  }
 67  *result = val;
 68  *termchar = ch;
 69  return TRUE;
 70}
 71
 72
 73GLOBAL(boolean)
 74read_quant_tables (j_compress_ptr cinfo, char * filename, 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, cinfo->q_scale_factor[tblno],
112			 force_baseline);
113    tblno++;
114  }
115
116  if (termchar != EOF) {
117    fprintf(stderr, "Non-numeric data in file %s\n", filename);
118    fclose(fp);
119    return FALSE;
120  }
121
122  fclose(fp);
123  return TRUE;
124}
125
126
127#ifdef C_MULTISCAN_FILES_SUPPORTED
128
129LOCAL(boolean)
130read_scan_integer (FILE * file, long * result, int * termchar)
131/* Variant of read_text_integer that always looks for a non-space termchar;
132 * this simplifies parsing of punctuation in scan scripts.
133 */
134{
135  register int ch;
136
137  if (! read_text_integer(file, result, termchar))
138    return FALSE;
139  ch = *termchar;
140  while (ch != EOF && isspace(ch))
141    ch = text_getc(file);
142  if (isdigit(ch)) {		/* oops, put it back */
143    if (ungetc(ch, file) == EOF)
144      return FALSE;
145    ch = ' ';
146  } else {
147    /* Any separators other than ';' and ':' are ignored;
148     * this allows user to insert commas, etc, if desired.
149     */
150    if (ch != EOF && ch != ';' && ch != ':')
151      ch = ' ';
152  }
153  *termchar = ch;
154  return TRUE;
155}
156
157
158GLOBAL(boolean)
159read_scan_script (j_compress_ptr cinfo, char * filename)
160/* Read a scan script from the specified text file.
161 * Each entry in the file defines one scan to be emitted.
162 * Entries are separated by semicolons ';'.
163 * An entry contains one to four component indexes,
164 * optionally followed by a colon ':' and four progressive-JPEG parameters.
165 * The component indexes denote which component(s) are to be transmitted
166 * in the current scan.  The first component has index 0.
167 * Sequential JPEG is used if the progressive-JPEG parameters are omitted.
168 * The file is free format text: any whitespace may appear between numbers
169 * and the ':' and ';' punctuation marks.  Also, other punctuation (such
170 * as commas or dashes) can be placed between numbers if desired.
171 * Comments preceded by '#' may be included in the file.
172 * Note: we do very little validity checking here;
173 * jcmaster.c will validate the script parameters.
174 */
175{
176  FILE * fp;
177  int scanno, ncomps, termchar;
178  long val;
179  jpeg_scan_info * scanptr;
180#define MAX_SCANS  100		/* quite arbitrary limit */
181  jpeg_scan_info scans[MAX_SCANS];
182
183  if ((fp = fopen(filename, "r")) == NULL) {
184    fprintf(stderr, "Can't open scan definition file %s\n", filename);
185    return FALSE;
186  }
187  scanptr = scans;
188  scanno = 0;
189
190  while (read_scan_integer(fp, &val, &termchar)) {
191    if (scanno >= MAX_SCANS) {
192      fprintf(stderr, "Too many scans defined in file %s\n", filename);
193      fclose(fp);
194      return FALSE;
195    }
196    scanptr->component_index[0] = (int) val;
197    ncomps = 1;
198    while (termchar == ' ') {
199      if (ncomps >= MAX_COMPS_IN_SCAN) {
200	fprintf(stderr, "Too many components in one scan in file %s\n",
201		filename);
202	fclose(fp);
203	return FALSE;
204      }
205      if (! read_scan_integer(fp, &val, &termchar))
206	goto bogus;
207      scanptr->component_index[ncomps] = (int) val;
208      ncomps++;
209    }
210    scanptr->comps_in_scan = ncomps;
211    if (termchar == ':') {
212      if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
213	goto bogus;
214      scanptr->Ss = (int) val;
215      if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
216	goto bogus;
217      scanptr->Se = (int) val;
218      if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
219	goto bogus;
220      scanptr->Ah = (int) val;
221      if (! read_scan_integer(fp, &val, &termchar))
222	goto bogus;
223      scanptr->Al = (int) val;
224    } else {
225      /* set non-progressive parameters */
226      scanptr->Ss = 0;
227      scanptr->Se = DCTSIZE2-1;
228      scanptr->Ah = 0;
229      scanptr->Al = 0;
230    }
231    if (termchar != ';' && termchar != EOF) {
232bogus:
233      fprintf(stderr, "Invalid scan entry format in file %s\n", filename);
234      fclose(fp);
235      return FALSE;
236    }
237    scanptr++, scanno++;
238  }
239
240  if (termchar != EOF) {
241    fprintf(stderr, "Non-numeric data in file %s\n", filename);
242    fclose(fp);
243    return FALSE;
244  }
245
246  if (scanno > 0) {
247    /* Stash completed scan list in cinfo structure.
248     * NOTE: for cjpeg's use, JPOOL_IMAGE is the right lifetime for this data,
249     * but if you want to compress multiple images you'd want JPOOL_PERMANENT.
250     */
251    scanptr = (jpeg_scan_info *)
252      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
253				  scanno * SIZEOF(jpeg_scan_info));
254    MEMCOPY(scanptr, scans, scanno * SIZEOF(jpeg_scan_info));
255    cinfo->scan_info = scanptr;
256    cinfo->num_scans = scanno;
257  }
258
259  fclose(fp);
260  return TRUE;
261}
262
263#endif /* C_MULTISCAN_FILES_SUPPORTED */
264
265
266GLOBAL(boolean)
267set_quality_ratings (j_compress_ptr cinfo, char *arg, boolean force_baseline)
268/* Process a quality-ratings parameter string, of the form
269 *     N[,N,...]
270 * If there are more q-table slots than parameters, the last value is replicated.
271 */
272{
273  int val = 75;			/* default value */
274  int tblno;
275  char ch;
276
277  for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) {
278    if (*arg) {
279      ch = ',';			/* if not set by sscanf, will be ',' */
280      if (sscanf(arg, "%d%c", &val, &ch) < 1)
281	return FALSE;
282      if (ch != ',')		/* syntax check */
283	return FALSE;
284      /* Convert user 0-100 rating to percentage scaling */
285      cinfo->q_scale_factor[tblno] = jpeg_quality_scaling(val);
286      while (*arg && *arg++ != ',') /* advance to next segment of arg string */
287	;
288    } else {
289      /* reached end of parameter, set remaining factors to last value */
290      cinfo->q_scale_factor[tblno] = jpeg_quality_scaling(val);
291    }
292  }
293  jpeg_default_qtables(cinfo, force_baseline);
294  return TRUE;
295}
296
297
298GLOBAL(boolean)
299set_quant_slots (j_compress_ptr cinfo, char *arg)
300/* Process a quantization-table-selectors parameter string, of the form
301 *     N[,N,...]
302 * If there are more components than parameters, the last value is replicated.
303 */
304{
305  int val = 0;			/* default table # */
306  int ci;
307  char ch;
308
309  for (ci = 0; ci < MAX_COMPONENTS; ci++) {
310    if (*arg) {
311      ch = ',';			/* if not set by sscanf, will be ',' */
312      if (sscanf(arg, "%d%c", &val, &ch) < 1)
313	return FALSE;
314      if (ch != ',')		/* syntax check */
315	return FALSE;
316      if (val < 0 || val >= NUM_QUANT_TBLS) {
317	fprintf(stderr, "JPEG quantization tables are numbered 0..%d\n",
318		NUM_QUANT_TBLS-1);
319	return FALSE;
320      }
321      cinfo->comp_info[ci].quant_tbl_no = val;
322      while (*arg && *arg++ != ',') /* advance to next segment of arg string */
323	;
324    } else {
325      /* reached end of parameter, set remaining components to last table */
326      cinfo->comp_info[ci].quant_tbl_no = val;
327    }
328  }
329  return TRUE;
330}
331
332
333GLOBAL(boolean)
334set_sample_factors (j_compress_ptr cinfo, char *arg)
335/* Process a sample-factors parameter string, of the form
336 *     HxV[,HxV,...]
337 * If there are more components than parameters, "1x1" is assumed for the rest.
338 */
339{
340  int ci, val1, val2;
341  char ch1, ch2;
342
343  for (ci = 0; ci < MAX_COMPONENTS; ci++) {
344    if (*arg) {
345      ch2 = ',';		/* if not set by sscanf, will be ',' */
346      if (sscanf(arg, "%d%c%d%c", &val1, &ch1, &val2, &ch2) < 3)
347	return FALSE;
348      if ((ch1 != 'x' && ch1 != 'X') || ch2 != ',') /* syntax check */
349	return FALSE;
350      if (val1 <= 0 || val1 > 4 || val2 <= 0 || val2 > 4) {
351	fprintf(stderr, "JPEG sampling factors must be 1..4\n");
352	return FALSE;
353      }
354      cinfo->comp_info[ci].h_samp_factor = val1;
355      cinfo->comp_info[ci].v_samp_factor = val2;
356      while (*arg && *arg++ != ',') /* advance to next segment of arg string */
357	;
358    } else {
359      /* reached end of parameter, set remaining components to 1x1 sampling */
360      cinfo->comp_info[ci].h_samp_factor = 1;
361      cinfo->comp_info[ci].v_samp_factor = 1;
362    }
363  }
364  return TRUE;
365}