check GIF list files to be the same size so not crashing

[goodguy/cinelerra.git] / cinelerra-5.1 / cinelerra / filegif.C

diff --git a/cinelerra-5.1/cinelerra/filegif.C b/cinelerra-5.1/cinelerra/filegif.C
index bb26762bef07094251db75deeaea1b000230bcc6..b80f741206c4b47a97e9b8020c0e049eccabce23 100644 (file)
--- a/cinelerra-5.1/cinelerra/filegif.C
+++ b/cinelerra-5.1/cinelerra/filegif.C
@@ -31,6 +31,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <string.h>
+#include <ctype.h>
 
 //from "getarg.h"
 extern "C"
@@ -500,6 +501,65 @@ FrameWriterUnit* FileGIFList::new_writer_unit(FrameWriter *writer)
        return new GIFUnit(this, writer);
 }
 
+int FileGIFList::verify_file_list()
+{
+ // go through all .gif files in the list and
+ // verify their sizes match or not.
+ //printf("\nAsset Path: %s\n", asset->path);
+ FILE *stream = fopen(asset->path, "rb");
+ if (stream) {
+  char string[BCTEXTLEN];
+  int width, height, prev_width=-1, prev_height=-1;
+  // build the path prefix
+  char prefix[BCTEXTLEN], *bp = prefix, *cp = strrchr(asset->path, '/');
+  for( int i=0, n=!cp ? 0 : cp-asset->path; i<n; ++i ) *bp++ = asset->path[i];
+  *bp = 0;
+  // read entire input file
+  while( !feof(stream) && fgets(string, BCTEXTLEN, stream) ) {
+   int len = strlen(string);
+   if(!len || string[0] == '#' || string[0] == ' ' || isalnum(string[0])) continue;
+   if( string[len-1] == '\n' ) string[len-1] = 0;
+   // a possible .gif file path? fetch it
+   char path[BCTEXTLEN], *pp = path, *ep = pp + sizeof(path)-1;
+   if( string[0] == '.' && string[1] == '/' && prefix[0] )
+    pp += snprintf(pp, ep-pp, "%s/", prefix);
+   snprintf(pp, ep-pp, "%s", string);
+   // check if a valid file exists
+   if(!access(path, R_OK)) {
+    // check file header for size
+    FILE *gif_file_temp = fopen(path, "rb");
+    if (gif_file_temp) {
+     unsigned char test[16];
+     int ret = fread(test, 16, 1, gif_file_temp);
+     fclose(gif_file_temp);
+     if( ret < 1 ) continue;
+     // get height and width of gif file
+     width = test[6] | (test[7] << 8);
+     height = test[8] | (test[9] << 8);
+     // test with previous
+     if ( (prev_width == -1) && (prev_height == -1) ) {
+      prev_width = width;
+      prev_height = height;
+      continue;
+     }
+     else if ( (prev_width != width) || (prev_height != height) ) {
+      // this is the error case we are trying to avoid
+      fclose(stream);
+      return 0;
+     }
+    }
+
+   }
+  }
+  fclose(stream);
+  return 1;
+ }
+ // not sure if our function should be the one to raise not found error
+ perror(asset->path);
+ return 0;
+}
+
+
 GIFUnit::GIFUnit(FileGIFList *file, FrameWriter *writer)
  : FrameWriterUnit(writer)
 {