From 8e7e4b87bfa0521d2969c8d933e1d8e1c64cc9a6 Mon Sep 17 00:00:00 2001
From: Lee Salzman <lsalzman@gmail.com>
Date: Fri, 11 Feb 2011 08:57:42 +0000
Subject: [PATCH] gzstream SEEK_END support

git-svn-id: svn://svn.code.sf.net/p/actiongame/code/trunk/ac@6089 e016b1c5-ed68-44aa-a2f7-31cac88cffde
---
 source/src/stream.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/source/src/stream.cpp b/source/src/stream.cpp
index 3974c73d..9c7f15e0 100644
--- a/source/src/stream.cpp
+++ b/source/src/stream.cpp
@@ -622,9 +622,15 @@ struct gzstream : stream
 
     bool seek(long offset, int whence)
     {
-        if(writing || !reading || whence == SEEK_END) return false;
+        if(writing || !reading) return false;
 
-        if(whence == SEEK_CUR) offset += zfile.total_out;
+        if(whence == SEEK_END)
+        {
+            uchar skip[512];
+            while(read(skip, sizeof(skip)) == sizeof(skip));
+            return !offset;
+        }
+        else if(whence == SEEK_CUR) offset += zfile.total_out;
 
         if(offset >= (int)zfile.total_out) offset -= zfile.total_out;
         else if(offset < 0 || !file->seek(headersize, SEEK_SET)) return false;