From 7170b90c2ad8c3014c69f12a0192e7464336f492 Mon Sep 17 00:00:00 2001
From: Pixel <pixel@nobis-crew.org>
Date: Tue, 2 Jun 2009 00:07:39 +0000
Subject: Protecting Buffers against erratic seeks.

---
 lib/Buffer.cc | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'lib')

diff --git a/lib/Buffer.cc b/lib/Buffer.cc
index 68ecb9e..473da62 100644
--- a/lib/Buffer.cc
+++ b/lib/Buffer.cc
@@ -181,9 +181,11 @@ bool Buffer::CanSeek() const {
 }
 
 off_t Buffer::seek(off_t off, int wheel) throw (GeneralException) {
+    size_t old_ptr;
     if (!seekable) {
         throw GeneralException("This buffer is a fifo, thus is not seekable");
     }
+    old_ptr = ptr;
     switch (wheel) {
     case SEEK_SET:
         ptr = off;
@@ -195,6 +197,10 @@ off_t Buffer::seek(off_t off, int wheel) throw (GeneralException) {
         ptr = realsiz + off;
         break;
     }
+    if (ptr < 0) {
+        ptr = old_ptr;
+        throw GeneralException("Can't seek a Buffer before its start.")
+    }
     operator[](ptr);
     return ptr;
 }
-- 
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