#!/bin/sh
echo "Don't forget to update this script with the change-log!
Press ENTER to start..."
read

NAME="libtorrent"
VERSION="0.12.6"
SOURCE="http://libtorrent.rakshasa.no/downloads/libtorrent-$VERSION.tar.gz"
CONFIGURE="--prefix=/usr/local --disable-debug"
DATE=`date '+%Y/%m/%d'`
export CFLAGS="-march=i486 -mtune=i686 -Os -pipe"
export CXXFLAGS="-march=i486 -mtune=i686 -Os -pipe"
export LDFLAGS="-Wl,-O1"

echo "Downloading essential packages..."
tce-load -wi compiletc squashfs-tools-4.x openssl-0.9.8-dev libsigc++

cd /tmp/
wget $SOURCE
sudo rm -rf $NAME-$VERSION 2>/dev/null
sudo rm /tmp/$NAME.tcz /tmp/$NAME.tcz.list /tmp/$NAME.tcz.md5.txt /tmp/$NAME.tcz.dep 2>/dev/null
sudo rm -rf /tmp/$NAME 2>/dev/null
tar xvfz $NAME-$VERSION.tar.gz
cd $NAME-$VERSION

# http://www.ha-obsession.net/2010/02/rtorrent-patch-almost-linear.html
echo "--- libtorrent-0.12.5/src/download/chunk_selector.cc    2009-05-13 15:10:13.000000000 +0200
+++ libtorrent-0.12.5.new/src/download/chunk_selector.cc        2009-12-22 16:38:50.000000000 +0100
@@ -79,13 +79,14 @@
   m_sharedQueue.clear();
 
   if (m_position == invalid_chunk)
-    m_position = random() % size();
+    m_position = (random() % size()) / 10;
 
   advance_position();
 }
 
 uint32_t
 ChunkSelector::find(PeerChunks* pc, __UNUSED bool highPriority) {
+  int tmp;
   // This needs to be re-enabled.
   if (m_position == invalid_chunk)
     return invalid_chunk;
@@ -100,8 +101,28 @@
   // Randomize position on average every 16 chunks to prevent
   // inefficient distribution with a slow seed and fast peers
   // all arriving at the same position.
-  if ((random() & 63) == 0) {
-    m_position = random() % size();
+
+  if ((random() & 31) == 0) {
+
+    tmp = random();
+    switch( tmp % 7 ) {
+       case 0:
+       case 1:
+       case 2:
+       case 3:
+       case 4:
+         m_position = 0;
+         break;
+       case 6:
+         m_position = size() - 20;
+         if (m_position > 0) {
+           break;
+         }
+       default:
+          m_position = tmp % size();
+         break;
+    }
+
     queue->clear();
   }
" > libtorrent-0.12.5-almost-linear-downloading.patch

################################
  
echo "
Check source BEFORE almost-linear-downloading patch: (grep should NOT find any matches):
"
grep -c "int tmp;" ./src/download/chunk_selector.cc
echo "Press ENTER to continue..."
read
patch -Np1 -i libtorrent-0.12.5-almost-linear-downloading.patch
echo "
Check source AFTER almost-linear-downloading patch: (grep should find 1 match):
"
grep -c "int tmp;" ./src/download/chunk_selector.cc
echo "Press ENTER to continue..."
read

################################

echo "
Starting ./configure $CONFIGURE"
./configure $CONFIGURE
echo "Press ENTER to continue...
"
read
make -j3
echo "
Starting make install to: /tmp/$NAME"
sudo make DESTDIR=/tmp/$NAME install-strip

cd /tmp/$NAME

sudo find . | xargs file | grep "executable" | grep ELF | grep "not stripped" | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null
sudo find . | xargs file | grep "shared object" | grep ELF | grep "not stripped" | cut -f 1 -d : | xargs strip -g 2> /dev/null

cd /tmp/
sudo mv $NAME $NAME-dev
mkdir -p /tmp/$NAME/usr/local/lib
cd /tmp/$NAME-dev/usr/local/lib
sudo mv *.so* /tmp/$NAME/usr/local/lib/
sudo mv *.la* /tmp/$NAME/usr/local/lib/

echo "Creating package..."
cd /tmp/
sudo mksquashfs $NAME $NAME.tcz
sudo md5sum $NAME.tcz > $NAME.tcz.md5.txt
cd $NAME
sudo find usr -not -type d > ../$NAME.tcz.list
cd /tmp/

SIZE="`du -k $NAME.tcz|cut -f1`k"
sudo echo "Title:          $NAME.tcz
Description:    libTorrent + patch
Version:        $VERSION 
Author:         Jari Sundell
Original-site:  http://libtorrent.rakshasa.no/
Copying-policy: GPL
Size:           $SIZE
Extension_by:   andriscom
Comments:       LibTorrent is a BitTorrent library written in C++ for *nix, with a focus on high performance and good code.

                The following patch was applied:
                 http://www.ha-obsession.net/2010/02/rtorrent-patch-almost-linear.html

                Built with CFLAGS: -march=i486 -mtune=i686 -Os -pipe
                Built with CXXFLAGS: -march=i486 -mtune=i686 -Os -pipe
                Built with LDFLAGS: -Wl,-O1
                Built with the following options:
                ./configure $CONFIGURE
Source:         $SOURCE
Change-log:     2010/09/28 First version (0.12.6)
                $DATE Version: $VERSION - Added: CFLAGS, CXXFLAGS, LDFLAGS, file preallocation with posix-fallocate, almost-linear-downloading.patch
Current:        $DATE Version: $VERSION - Added: CFLAGS, CXXFLAGS, LDFLAGS, file preallocation with posix-fallocate, almost-linear-downloading.patch
" > $NAME.tcz.info

sudo echo "openssl-0.9.8.tcz
libsigc++.tcz
" > $NAME.tcz.dep

echo "Creating package..."
cd /tmp/
sudo mksquashfs $NAME-dev $NAME-dev.tcz
sudo md5sum $NAME-dev.tcz > $NAME-dev.tcz.md5.txt
cd $NAME-dev
sudo find usr -not -type d > ../$NAME-dev.tcz.list
cd /tmp/

SIZE="`du -k $NAME-dev.tcz|cut -f1`k"
sudo echo "Title:          $NAME-dev.tcz
Description:    libTorrent dev files
Version:        $VERSION 
Author:         Jari Sundell
Original-site:  http://libtorrent.rakshasa.no/
Copying-policy: GPL
Size:           $SIZE
Extension_by:   andriscom
Comments:       LibTorrent is a BitTorrent library written in C++ for *nix, with a focus on high performance and good code.

                The following patch was applied:
                 http://www.ha-obsession.net/2010/02/rtorrent-patch-almost-linear.html

                Built with CFLAGS: -march=i486 -mtune=i686 -Os -pipe
                Built with CXXFLAGS: -march=i486 -mtune=i686 -Os -pipe
                Built with LDFLAGS: -Wl,-O1
                Built with the following options:
                ./configure $CONFIGURE
Source:         $SOURCE
Change-log:     2010/09/28 First version (0.12.6)
                $DATE Version: $VERSION - Added: CFLAGS, CXXFLAGS, LDFLAGS, almost-linear-downloading.patch
Current:        $DATE Version: $VERSION - Added: CFLAGS, CXXFLAGS, LDFLAGS, almost-linear-downloading.patch
" > $NAME-dev.tcz.info

sudo echo "$NAME.tcz
" > $NAME-dev.tcz.dep

cd /tmp/
mkdir packages 2>/dev/null
sudo rm packages/$NAME.tar.gz 2>/dev/null
sudo rm packages/$NAME-dev.tar.gz 2>/dev/null
tar zcf packages/$NAME.tar.gz $NAME.tcz*
tar zcf packages/$NAME-dev.tar.gz $NAME-dev.tcz*
echo "
Run bcrypt on /tmp/packages/*.tar.gz... give password: tinycore"
echo "Run the extension_audit.sh and reboot a clean system to try the packages!"
echo "Send it to: tcesubmit@gmail.com"