rnd-19990822-1-src

[rocksndiamonds.git] / src / pcx.c

diff --git a/src/pcx.c b/src/pcx.c
index 514d30de6041f7683a86e96cffed79e474767357..a5fd0c92819bef9931867f43d0eda76f744886b6 100644 (file)
--- a/src/pcx.c
+++ b/src/pcx.c
@@ -45,6 +45,9 @@ 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 +130,29 @@ 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 +161,7 @@ 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;
   }
 
@@ -176,6 +188,7 @@ Image *Read_PCX_to_Image(char *filename)
       width < 0 || height < 0)
   {
     free(file_buffer);
+    errno_pcx = PCX_FileInvalid;
     return NULL;
   }
 
@@ -185,6 +198,7 @@ Image *Read_PCX_to_Image(char *filename)
           filename, pcx.xmax, pcx.ymax,
           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" :
@@ -202,6 +216,15 @@ 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 +233,7 @@ Image *Read_PCX_to_Image(char *filename)
   {
     free(file_buffer);
     freeImage(image);
+    errno_pcx = PCX_ColorFailed;
     return NULL;
   }