rnd-20000718-1-src

[rocksndiamonds.git] / src / pcx.c

diff --git a/src/pcx.c b/src/pcx.c
index 514d30de6041f7683a86e96cffed79e474767357..b26e44274c4c99d8f7dbfa18857cf5bedd20af6b 100644 (file)
--- a/src/pcx.c
+++ b/src/pcx.c
@@ -15,6 +15,8 @@
 #include "image.h"
 #include "misc.h"
 
+#define PCX_DEBUG              FALSE
+
 #define PCX_MAGIC              0x0a    /* first byte in a PCX image file    */
 #define PCX_LAST_VERSION       5       /* last acceptable version number    */
 #define PCX_ENCODING           1       /* PCX encoding method               */
@@ -45,6 +47,9 @@ struct PCX_Header
   unsigned char filler[58];    /* fill to struct size of 128          */
 };
 
+/* global PCX error value */
+int errno_pcx = PCX_Success;
+
 static byte *PCX_ReadBitmap(Image *image, byte *buffer_ptr, byte *buffer_last)
 {
   /* Run Length Encoding: If the two high bits are set,
@@ -127,21 +132,30 @@ Image *Read_PCX_to_Image(char *filename)
   int width, height, depth;
   int i;
 
+  errno_pcx = PCX_Success;
+
   if (!(file = fopen(filename, "r")))
+  {
+    errno_pcx = PCX_OpenFailed;
     return NULL;
+  }
 
   if (fseek(file, 0, SEEK_END) == -1)
   {
     fclose(file);
+    errno_pcx = PCX_ReadFailed;
     return NULL;
   }
 
   file_length = ftell(file);
   rewind(file);
 
-  if (file_length < PCX_HEADER_SIZE + PCX_COLORMAP_SIZE)
+  if (file_length < PCX_HEADER_SIZE)
   {
+    /* PCX file is too short to contain a valid PCX header */
     fclose(file);
+
+    errno_pcx = PCX_FileInvalid;
     return NULL;
   }
 
@@ -150,6 +164,7 @@ Image *Read_PCX_to_Image(char *filename)
   if (fread(file_buffer, 1, file_length, file) != file_length)
   {
     fclose(file);
+    errno_pcx = PCX_ReadFailed;
     return NULL;
   }
 
@@ -176,20 +191,25 @@ Image *Read_PCX_to_Image(char *filename)
       width < 0 || height < 0)
   {
     free(file_buffer);
+
+    errno_pcx = PCX_FileInvalid;
     return NULL;
   }
 
+#if PCX_DEBUG
   if (options.verbose)
   {
     printf("%s is a %dx%d PC Paintbrush image with %d bitplanes\n",
-          filename, pcx.xmax, pcx.ymax,
+          filename, width, height,
           pcx.color_planes);
     printf("depth: %d\n", pcx.bits_per_pixel);
+    printf("color_planes: %d\n", pcx.color_planes);
     printf("bytes_per_line: %d\n", pcx.bytes_per_line);
     printf("palette type: %s\n",
           (pcx.palette_type == 1 ? "color" :
            pcx.palette_type == 2 ? "grayscale" : "undefined"));
   }
+#endif
 
   /* allocate new image structure */
   image = newImage(width, height, depth);
@@ -202,6 +222,16 @@ Image *Read_PCX_to_Image(char *filename)
   {
     free(file_buffer);
     freeImage(image);
+
+    errno_pcx = PCX_FileInvalid;
+    return NULL;
+  }
+
+  if (file_length < PCX_HEADER_SIZE + PCX_COLORMAP_SIZE)
+  {
+    /* PCX file is too short to contain a valid 256 colors colormap */
+    fclose(file);
+    errno_pcx = PCX_ColorFailed;
     return NULL;
   }
 
@@ -210,6 +240,7 @@ Image *Read_PCX_to_Image(char *filename)
   {
     free(file_buffer);
     freeImage(image);
+    errno_pcx = PCX_ColorFailed;
     return NULL;
   }
 
@@ -221,8 +252,10 @@ Image *Read_PCX_to_Image(char *filename)
     if (image->rgb.color_used[i])
       image->rgb.used++;
 
+#if PCX_DEBUG
   if (options.verbose)
     printf("Read_PCX_to_Image: %d colors found\n", image->rgb.used);
+#endif
 
   return image;
 }