Format: Fixing space indent when there is no signature.

Incorporating feedback from Bu11etmagnet related to checking is an unsigned size_t is negative.

src/format-isobmff.cpp

@@ -368,7 +368,7 @@ sealfield *	Seal_BMFF	(sealfield *Args, mmapfile *Mmap)
   Args = Seal_BMFFsign(Args,Mmap); // Add a signature as needed
   if (SealGetIindex(Args,"@s",2)==0) // no signatures
     {
-    printf("No SEAL signatures found.\n");
+    printf(" No SEAL signatures found.\n");
     }
 
   return(Args);

src/format-jpeg.cpp

@@ -721,7 +721,7 @@ sealfield *	Seal_JPEG	(sealfield *Args, mmapfile *Mmap)
   Args = Seal_JPEGsign(Args,Mmap,FFDAoffset, (PreviousBlockType == 0xffe8) ? 0xffe9 : 0xffe8);
   if (SealGetIindex(Args,"@s",2)==0) // no signatures
     {
-    printf("No SEAL signatures found.\n");
+    printf(" No SEAL signatures found.\n");
     }
 
   return(Args);

src/format-matroska.cpp

@@ -244,7 +244,7 @@ sealfield *	Seal_Matroska	(sealfield *Args, mmapfile *Mmap)
   Args = Seal_Matroskasign(Args,Mmap); // Add a signature as needed
   if (SealGetIindex(Args,"@s",2)==0) // no signatures
     {
-    printf("No SEAL signatures found.\n");
+    printf(" No SEAL signatures found.\n");
     }
 
   return(Args);

src/format-png.cpp

@@ -374,7 +374,7 @@ sealfield *	Seal_PNG	(sealfield *Args, mmapfile *Mmap)
   Args = Seal_PNGsign(Args,Mmap,IEND_offset); // Add a signature as needed
   if (SealGetIindex(Args,"@s",2)==0) // no signatures
     {
-    printf("No SEAL signatures found.\n");
+    printf(" No SEAL signatures found.\n");
     }
 
   return(Args);

src/format-riff.cpp

@@ -271,7 +271,7 @@ sealfield *	Seal_RIFF	(sealfield *Args, mmapfile *Mmap)
   Args = Seal_RIFFsign(Args,Mmap); // Add a signature as needed
   if (SealGetIindex(Args,"@s",2)==0) // no signatures
     {
-    printf("No SEAL signatures found.\n");
+    printf(" No SEAL signatures found.\n");
     }
 
   return(Args);

src/seal-parse.cpp

@@ -68,7 +68,7 @@ void	SealStrEncode	(sealfield *Data)
   // Count amount of new space required
   for(i=j=0; i < Data->ValueLen; i++,j++)
     {
-    if (strchr("'\"",Data->Value[i])) { j++; }
+    if (strchr("'\"\\",Data->Value[i])) { j++; }
     }
 
   // i=string length, j=new string length
@@ -78,14 +78,15 @@ void	SealStrEncode	(sealfield *Data)
     Data->Value = (byte*)realloc(Data->Value,Data->ValueLen+4);
     memset(Data->Value+i,0,j-i+4); // clear new memory
     // Now copy over all new characters
-    i--; j--; // Start at the last character
-    while((i >= 0) && (j > i))
+    // Start at the last character
+    // NOTE: Can't check if (i >= 0) since size_t is unsigned; always true.
+    while((i > 0) && (j > i))
       {
-      Data->Value[j] = Data->Value[i];
-      if (strchr("'\"",Data->Value[i]))
+      Data->Value[j-1] = Data->Value[i-1];
+      if (strchr("'\"\\",Data->Value[i-1]))
         {
 	j--;
-	Data->Value[j]='\\';
+	Data->Value[j-1]='\\';
 	}
        j--; i--;
       }

src/sign-verify.cpp

@@ -657,7 +657,7 @@ sealfield *	SealVerify	(sealfield *Rec, mmapfile *Mmap)
    If it's 1, then check if it covers the start of the file.
    *****/
   signum = SealGetIindex(Rec,"@s",2);
-  if (signum < 1) // should never happen
+  if (signum < 1) // happens if the seal record is corrupted
     {
     printf(" WARNING: Invalid SEAL record count (%ld).\n",signum);
     return(Rec);