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9a210ca2d5
Something like "char *s = ...; isdigit(s[0]);" triggers undefined behavior, because char can be signed, and thus s[0] can be a negative value. The is*() functions require unsigned char _or_ EOF. EOF is a special value outside of unsigned char range, thus the argument to the is*() functions can't be a char. This undefined behavior can actually trigger crashes if the implementation of these functions e.g. uses lookup tables, which are then indexed with out-of-range values. Replace all <ctype.h> uses with our own custom mp_is*() functions added with misc/ctype.h. As a bonus, these functions are locale-independent. (Although currently, we _require_ C locale for other reasons.)
98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/*
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* PNM image files loader
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*
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* copyleft (C) 2005-2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
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*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* You can alternatively redistribute this file and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*/
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/**
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* \file pnm_loader.c
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* \brief PNM image files loader
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdio.h>
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#include "misc/ctype.h"
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#include "pnm_loader.h"
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/**
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* \brief skips whitespace and comments
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* \param f file to read from
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*/
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static void ppm_skip(FILE *f) {
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int c, comment = 0;
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do {
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c = fgetc(f);
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if (c == '#')
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comment = 1;
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if (c == '\n')
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comment = 0;
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} while (c != EOF && (mp_isspace(c) || comment));
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if (c != EOF)
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ungetc(c, f);
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}
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#define MAXDIM (16 * 1024)
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uint8_t *read_pnm(FILE *f, int *width, int *height,
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int *bytes_per_pixel, int *maxval) {
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uint8_t *data;
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int type;
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unsigned w, h, m, val, bpp;
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*width = *height = *bytes_per_pixel = *maxval = 0;
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ppm_skip(f);
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if (fgetc(f) != 'P')
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return NULL;
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type = fgetc(f);
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if (type != '5' && type != '6')
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return NULL;
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ppm_skip(f);
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if (fscanf(f, "%u", &w) != 1)
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return NULL;
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ppm_skip(f);
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if (fscanf(f, "%u", &h) != 1)
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return NULL;
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ppm_skip(f);
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if (fscanf(f, "%u", &m) != 1)
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return NULL;
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val = fgetc(f);
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if (!mp_isspace(val))
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return NULL;
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if (w > MAXDIM || h > MAXDIM)
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return NULL;
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bpp = (m > 255) ? 2 : 1;
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if (type == '6')
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bpp *= 3;
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data = malloc(w * h * bpp);
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if (fread(data, w * bpp, h, f) != h) {
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free(data);
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return NULL;
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}
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*width = w;
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*height = h;
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*bytes_per_pixel = bpp;
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*maxval = m;
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return data;
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}
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