333 lines
9.8 KiB
C
333 lines
9.8 KiB
C
/*
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* rdswitch.c
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*
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* Copyright (C) 1991-1996, Thomas G. Lane.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains routines to process some of cjpeg's more complicated
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* command-line switches. Switches processed here are:
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* -qtables file Read quantization tables from text file
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* -scans file Read scan script from text file
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* -qslots N[,N,...] Set component quantization table selectors
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* -sample HxV[,HxV,...] Set component sampling factors
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*/
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#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
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#include <ctype.h> /* to declare isdigit(), isspace() */
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LOCAL(int)
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text_getc (FILE * file)
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/* Read next char, skipping over any comments (# to end of line) */
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/* A comment/newline sequence is returned as a newline */
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{
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register int ch;
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ch = getc(file);
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if (ch == '#') {
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do {
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ch = getc(file);
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} while (ch != '\n' && ch != EOF);
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}
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return ch;
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}
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LOCAL(boolean)
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read_text_integer (FILE * file, long * result, int * termchar)
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/* Read an unsigned decimal integer from a file, store it in result */
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/* Reads one trailing character after the integer; returns it in termchar */
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{
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register int ch;
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register long val;
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/* Skip any leading whitespace, detect EOF */
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do {
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ch = text_getc(file);
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if (ch == EOF) {
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*termchar = ch;
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return FALSE;
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}
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} while (isspace(ch));
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if (! isdigit(ch)) {
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*termchar = ch;
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return FALSE;
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}
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val = ch - '0';
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while ((ch = text_getc(file)) != EOF) {
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if (! isdigit(ch))
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break;
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val *= 10;
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val += ch - '0';
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}
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*result = val;
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*termchar = ch;
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return TRUE;
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}
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GLOBAL(boolean)
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read_quant_tables (j_compress_ptr cinfo, char * filename,
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int scale_factor, boolean force_baseline)
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/* Read a set of quantization tables from the specified file.
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* The file is plain ASCII text: decimal numbers with whitespace between.
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* Comments preceded by '#' may be included in the file.
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* There may be one to NUM_QUANT_TBLS tables in the file, each of 64 values.
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* The tables are implicitly numbered 0,1,etc.
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* NOTE: does not affect the qslots mapping, which will default to selecting
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* table 0 for luminance (or primary) components, 1 for chrominance components.
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* You must use -qslots if you want a different component->table mapping.
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*/
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{
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FILE * fp;
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int tblno, i, termchar;
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long val;
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unsigned int table[DCTSIZE2];
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if ((fp = fopen(filename, "r")) == NULL) {
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fprintf(stderr, "Can't open table file %s\n", filename);
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return FALSE;
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}
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tblno = 0;
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while (read_text_integer(fp, &val, &termchar)) { /* read 1st element of table */
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if (tblno >= NUM_QUANT_TBLS) {
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fprintf(stderr, "Too many tables in file %s\n", filename);
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fclose(fp);
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return FALSE;
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}
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table[0] = (unsigned int) val;
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for (i = 1; i < DCTSIZE2; i++) {
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if (! read_text_integer(fp, &val, &termchar)) {
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fprintf(stderr, "Invalid table data in file %s\n", filename);
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fclose(fp);
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return FALSE;
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}
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table[i] = (unsigned int) val;
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}
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jpeg_add_quant_table(cinfo, tblno, table, scale_factor, force_baseline);
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tblno++;
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}
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if (termchar != EOF) {
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fprintf(stderr, "Non-numeric data in file %s\n", filename);
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fclose(fp);
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return FALSE;
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}
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fclose(fp);
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return TRUE;
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}
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#ifdef C_MULTISCAN_FILES_SUPPORTED
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LOCAL(boolean)
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read_scan_integer (FILE * file, long * result, int * termchar)
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/* Variant of read_text_integer that always looks for a non-space termchar;
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* this simplifies parsing of punctuation in scan scripts.
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*/
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{
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register int ch;
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if (! read_text_integer(file, result, termchar))
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return FALSE;
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ch = *termchar;
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while (ch != EOF && isspace(ch))
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ch = text_getc(file);
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if (isdigit(ch)) { /* oops, put it back */
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if (ungetc(ch, file) == EOF)
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return FALSE;
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ch = ' ';
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} else {
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/* Any separators other than ';' and ':' are ignored;
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* this allows user to insert commas, etc, if desired.
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*/
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if (ch != EOF && ch != ';' && ch != ':')
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ch = ' ';
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}
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*termchar = ch;
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return TRUE;
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}
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GLOBAL(boolean)
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read_scan_script (j_compress_ptr cinfo, char * filename)
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/* Read a scan script from the specified text file.
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* Each entry in the file defines one scan to be emitted.
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* Entries are separated by semicolons ';'.
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* An entry contains one to four component indexes,
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* optionally followed by a colon ':' and four progressive-JPEG parameters.
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* The component indexes denote which component(s) are to be transmitted
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* in the current scan. The first component has index 0.
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* Sequential JPEG is used if the progressive-JPEG parameters are omitted.
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* The file is free format text: any whitespace may appear between numbers
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* and the ':' and ';' punctuation marks. Also, other punctuation (such
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* as commas or dashes) can be placed between numbers if desired.
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* Comments preceded by '#' may be included in the file.
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* Note: we do very little validity checking here;
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* jcmaster.c will validate the script parameters.
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*/
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{
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FILE * fp;
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int scanno, ncomps, termchar;
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long val;
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jpeg_scan_info * scanptr;
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#define MAX_SCANS 100 /* quite arbitrary limit */
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jpeg_scan_info scans[MAX_SCANS];
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if ((fp = fopen(filename, "r")) == NULL) {
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fprintf(stderr, "Can't open scan definition file %s\n", filename);
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return FALSE;
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}
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scanptr = scans;
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scanno = 0;
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while (read_scan_integer(fp, &val, &termchar)) {
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if (scanno >= MAX_SCANS) {
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fprintf(stderr, "Too many scans defined in file %s\n", filename);
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fclose(fp);
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return FALSE;
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}
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scanptr->component_index[0] = (int) val;
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ncomps = 1;
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while (termchar == ' ') {
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if (ncomps >= MAX_COMPS_IN_SCAN) {
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fprintf(stderr, "Too many components in one scan in file %s\n",
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filename);
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fclose(fp);
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return FALSE;
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}
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if (! read_scan_integer(fp, &val, &termchar))
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goto bogus;
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scanptr->component_index[ncomps] = (int) val;
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ncomps++;
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}
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scanptr->comps_in_scan = ncomps;
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if (termchar == ':') {
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if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
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goto bogus;
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scanptr->Ss = (int) val;
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if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
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goto bogus;
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scanptr->Se = (int) val;
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if (! read_scan_integer(fp, &val, &termchar) || termchar != ' ')
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goto bogus;
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scanptr->Ah = (int) val;
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if (! read_scan_integer(fp, &val, &termchar))
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goto bogus;
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scanptr->Al = (int) val;
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} else {
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/* set non-progressive parameters */
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scanptr->Ss = 0;
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scanptr->Se = DCTSIZE2-1;
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scanptr->Ah = 0;
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scanptr->Al = 0;
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}
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if (termchar != ';' && termchar != EOF) {
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bogus:
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fprintf(stderr, "Invalid scan entry format in file %s\n", filename);
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fclose(fp);
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return FALSE;
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}
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scanptr++, scanno++;
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}
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if (termchar != EOF) {
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fprintf(stderr, "Non-numeric data in file %s\n", filename);
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fclose(fp);
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return FALSE;
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}
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if (scanno > 0) {
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/* Stash completed scan list in cinfo structure.
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* NOTE: for cjpeg's use, JPOOL_IMAGE is the right lifetime for this data,
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* but if you want to compress multiple images you'd want JPOOL_PERMANENT.
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*/
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scanptr = (jpeg_scan_info *)
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
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scanno * SIZEOF(jpeg_scan_info));
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MEMCOPY(scanptr, scans, scanno * SIZEOF(jpeg_scan_info));
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cinfo->scan_info = scanptr;
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cinfo->num_scans = scanno;
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}
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fclose(fp);
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return TRUE;
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}
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#endif /* C_MULTISCAN_FILES_SUPPORTED */
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GLOBAL(boolean)
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set_quant_slots (j_compress_ptr cinfo, char *arg)
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/* Process a quantization-table-selectors parameter string, of the form
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* N[,N,...]
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* If there are more components than parameters, the last value is replicated.
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*/
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{
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int val = 0; /* default table # */
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int ci;
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char ch;
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for (ci = 0; ci < MAX_COMPONENTS; ci++) {
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if (*arg) {
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ch = ','; /* if not set by sscanf, will be ',' */
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if (sscanf(arg, "%d%c", &val, &ch) < 1)
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return FALSE;
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if (ch != ',') /* syntax check */
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return FALSE;
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if (val < 0 || val >= NUM_QUANT_TBLS) {
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fprintf(stderr, "JPEG quantization tables are numbered 0..%d\n",
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NUM_QUANT_TBLS-1);
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return FALSE;
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}
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cinfo->comp_info[ci].quant_tbl_no = val;
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while (*arg && *arg++ != ',') /* advance to next segment of arg string */
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;
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} else {
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/* reached end of parameter, set remaining components to last table */
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cinfo->comp_info[ci].quant_tbl_no = val;
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}
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}
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return TRUE;
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}
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GLOBAL(boolean)
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set_sample_factors (j_compress_ptr cinfo, char *arg)
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/* Process a sample-factors parameter string, of the form
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* HxV[,HxV,...]
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* If there are more components than parameters, "1x1" is assumed for the rest.
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*/
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{
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int ci, val1, val2;
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char ch1, ch2;
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for (ci = 0; ci < MAX_COMPONENTS; ci++) {
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if (*arg) {
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ch2 = ','; /* if not set by sscanf, will be ',' */
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if (sscanf(arg, "%d%c%d%c", &val1, &ch1, &val2, &ch2) < 3)
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return FALSE;
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if ((ch1 != 'x' && ch1 != 'X') || ch2 != ',') /* syntax check */
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return FALSE;
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if (val1 <= 0 || val1 > 4 || val2 <= 0 || val2 > 4) {
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fprintf(stderr, "JPEG sampling factors must be 1..4\n");
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return FALSE;
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}
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cinfo->comp_info[ci].h_samp_factor = val1;
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cinfo->comp_info[ci].v_samp_factor = val2;
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while (*arg && *arg++ != ',') /* advance to next segment of arg string */
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;
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} else {
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/* reached end of parameter, set remaining components to 1x1 sampling */
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cinfo->comp_info[ci].h_samp_factor = 1;
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cinfo->comp_info[ci].v_samp_factor = 1;
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}
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}
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return TRUE;
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}
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