Fix issue 884 (VirusTotal#887)

The yr_compiler_add_fd was reading only the first 1024 bytes of the file.

Author: plusvic

libyara/compiler.c

@@ -1159,6 +1159,13 @@ YR_API char* yr_compiler_get_error_message(
           buffer_size,
           "integer overflow in \"%s\"",
           compiler->last_error_extra_info);
+      break;
+    case ERROR_COULD_NOT_READ_FILE:
+      snprintf(
+          buffer,
+          buffer_size,
+          "could not read file");
+      break;
   }
 
   return buffer;

libyara/include/yara/error.h

@@ -97,6 +97,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define ERROR_INTEGER_OVERFLOW                  52
 #define ERROR_CALLBACK_REQUIRED                 53
 #define ERROR_INVALID_OPERAND                   54
+#define ERROR_COULD_NOT_READ_FILE               55
 
 
 #define FAIL_ON_ERROR(x) { \