skip empty files

log2wav.c

@@ -144,6 +144,13 @@ int main(int argc, char* argv[]){
     printf("Failed to open input file\n");
     return 0;
   }
+  fseek(logfile, 0, SEEK_END);
+  long filesize =  ftell(logfile);
+  if(filesize == 0){
+    printf("skipped empty file : %s\n", argv[1]);
+    return 0;
+  }
+  fseek(logfile, 0, SEEK_SET);
   int verbose = 0;
   if(argc==5){
     verbose = *argv[4]=='1';
@@ -152,8 +159,7 @@ int main(int argc, char* argv[]){
   parseLogFileHeader(logfile, &hdr, verbose);
   int resolutionBytes = hdr.resolutionBits/8;
   // get file size then move to start of data
-  fseek(logfile, 0, SEEK_END);
-  long filesize =  ftell(logfile);
+
   long dataBlockSampleSize = hdr.dmaBlockSize / ( hdr.numberOfChan  * resolutionBytes);
   if(verbose){
     printf("file size (bytes) %ld \n", filesize);
@@ -203,7 +209,6 @@ int main(int argc, char* argv[]){
   int ichan, isample;
   long pos = 0;
   bool isFirst = true;
-  fseek(logfile, hdr.headerSize + 4, SEEK_SET); // move past the logfile header
   // read each dataBlock
   do{
     fread(additionnalDataBlock, hdr.sizeOfAdditionnalDataBuffer, 1, logfile);