vo_gl: Move the read_pnm function into a separate file

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@32513 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 97 insertions, 0 deletions

diff --git a/pnm_loader.c b/pnm_loader.c
new file mode 100644
index 0000000000..048461e51f
--- /dev/null
+++ b/pnm_loader.c
@@ -0,0 +1,97 @@
+/*
+ * PNM image files loader
+ *
+ * copyleft (C) 2005-2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
+ *
+ * This file is part of MPlayer.
+ *
+ * MPlayer is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * MPlayer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with MPlayer; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * You can alternatively redistribute this file and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ */
+
+/**
+ * \file pnm_loader.c
+ * \brief PNM image files loader
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <ctype.h>
+#include "pnm_loader.h"
+
+/**
+ * \brief skips whitespace and comments
+ * \param f file to read from
+ */
+static void ppm_skip(FILE *f) {
+  int c, comment = 0;
+  do {
+    c = fgetc(f);
+    if (c == '#')
+      comment = 1;
+    if (c == '\n')
+      comment = 0;
+  } while (c != EOF && (isspace(c) || comment));
+  if (c != EOF)
+    ungetc(c, f);
+}
+
+#define MAXDIM (16 * 1024)
+
+uint8_t *read_pnm(FILE *f, int *width, int *height,
+                  int *bytes_per_pixel, int *maxval) {
+  uint8_t *data;
+  int type;
+  unsigned w, h, m, val, bpp;
+  *width = *height = *bytes_per_pixel = *maxval = 0;
+  ppm_skip(f);
+  if (fgetc(f) != 'P')
+    return NULL;
+  type = fgetc(f);
+  if (type != '5' && type != '6')
+    return NULL;
+  ppm_skip(f);
+  if (fscanf(f, "%u", &w) != 1)
+    return NULL;
+  ppm_skip(f);
+  if (fscanf(f, "%u", &h) != 1)
+    return NULL;
+  ppm_skip(f);
+  if (fscanf(f, "%u", &m) != 1)
+    return NULL;
+  val = fgetc(f);
+  if (!isspace(val))
+    return NULL;
+  if (w > MAXDIM || h > MAXDIM)
+    return NULL;
+  bpp = (m > 255) ? 2 : 1;
+  if (type == '6')
+    bpp *= 3;
+  data = malloc(w * h * bpp);
+  if (fread(data, w * bpp, h, f) != h) {
+    free(data);
+    return NULL;
+  }
+  *width  = w;
+  *height = h;
+  *bytes_per_pixel = bpp;
+  *maxval = m;
+  return data;
+}