#!/bin/sh

# Copyright 2017  Eric Hameleers, Eindhoven, NL
# Copyright 2017 Patrick J. Volkerding, Sebeka, MN, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

PKGNAM=id3lib
VERSION=${VERSION:-3.8.3}
BUILD=${BUILD:-1}

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$(uname -m)" in
    i?86) ARCH=i486 ;;
    arm*) readelf /usr/bin/file -A | egrep -q "Tag_CPU.*[4,5]" && ARCH=arm || ARCH=armv7hl ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
    *) ARCH=$(uname -m) ;;
  esac
  export ARCH
fi

CWD=$(pwd)
TMP=${TMP:-/tmp}
PKG=$TMP/package-$PKGNAM

if [ "$ARCH" = "i486" ]; then
  SLKCFLAGS="-O2 -march=i486 -mtune=i686"
  SLKLDFLAGS=""
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  SLKLDFLAGS="-L/usr/lib64"
  LIBDIRSUFFIX="64"
elif [ "$ARCH" = "armv7hl" ]; then
  SLKCFLAGS="-O3 -march=armv7-a -mfpu=vfpv3-d16"
  SLKLDFLAGS=""
  LIBDIRSUFFIX="64"
  LIBDIRSUFFIX=""
else
  SLKCFLAGS="-O2"
  SLKLDFLAGS=""
  LIBDIRSUFFIX=""
fi

case "$ARCH" in
    arm*) TARGET=$ARCH-slackware-linux-gnueabi ;;
    *)    TARGET=$ARCH-slackware-linux ;;
esac

rm -rf $PKG
mkdir -p $TMP $PKG
cd $TMP

rm -rf $PKGNAM-$VERSION
tar xvf $CWD/$PKGNAM-$VERSION.tar.?z* || exit 1
cd $PKGNAM-$VERSION || exit 1

# Patches obtained from Arch who obtained them from Debian and elsewhere -
# Use proper C++ headers:
cat $CWD/patches/id3lib.cppheaders.patch | patch -p1 --verbose || exit 1
# Add man pages:
cat $CWD/patches/id3lib.manpages.patch | patch -p1 --verbose || exit 1
# Write UTF8/UTF16 characters correctly:
cat $CWD/patches/id3lib.utf8_writing.patch | patch -p1 --verbose || exit 1
# Securely use mkstemp:
cat $CWD/patches/id3lib.mkstemp.patch | patch -p1 --verbose || exit 1
# Add C wrapper functions for field encoding:
cat $CWD/patches/id3lib.c_wrapper.patch | patch -p1 --verbose || exit 1
# Add a null pointer check:
cat $CWD/patches/id3lib.nullpointer_check.patch | patch -p1 --verbose || exit 1
# Fix stack smash crashes when reading VBR MP3:
cat $CWD/patches/id3lib.vbr_stack_smash.patch | patch -p1 --verbose || exit 1

# iomanip.h is obsolete; use the standard C++ header:
sed -e "s%iomanip.h%iomanip%g" -i configure

# Make sure ownerships and permissions are sane:
chown -R root:root .
find . \
  \( -perm 777 -o -perm 775 -o -perm 711 -o -perm 555 -o -perm 511 \) \
  -exec chmod 755 {} \; -o \
  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
  -exec chmod 644 {} \;

# Configure:
[ ! -x configure ] && ./autogen.sh
CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
LDFLAGS="$SLKLDFLAGS" \
./configure \
  --prefix=/usr \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --mandir=/usr/man \
  --localstatedir=/var \
  --sysconfdir=/etc \
  --enable-static=no \
  --enable-debug=no \
  --build=$TARGET

# Build and install:
make || exit 1
make install DESTDIR=$PKG || exit 1

# Strip binaries (if any):
find $PKG | xargs file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

# Add documentation:
mkdir -p $PKG/usr/doc/$PKGNAM-$VERSION
cp -a \
  AUTHORS COPYING ChangeLog HISTORY NEWS README THANKS TODO doc/*.txt \
  $PKG/usr/doc/$PKGNAM-$VERSION

# Add and compress man pages:
mkdir -p ${PKG}/usr/man/man1
install -p -m0644 doc/man/*.1 ${PKG}/usr/man/man1/
gzip -9 $PKG/usr/man/man?/*.1

# Add a package description:
mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

# Build the package:
cd $PKG
/sbin/makepkg -l y -c n $TMP/$PKGNAM-$VERSION-$ARCH-$BUILD.txz