# - Find zlib
# Find the native ZLIB includes and library
#
#  $Id$
#
#  ZLIB_INCLUDE_DIRS - where to find zlib.h, etc.
#  ZLIB_LIBRARIES    - List of libraries when using zlib.
#  ZLIB_FOUND        - True if zlib found.

#=============================================================================
# Copyright 2001-2009 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distributed this file outside of CMake, substitute the full
#  License text for the above reference.)

IF (ZLIB_INCLUDE_DIR)
  # Already in cache, be silent
  SET(ZLIB_FIND_QUIETLY TRUE)
ENDIF (ZLIB_INCLUDE_DIR)

FIND_PATH(ZLIB_INCLUDE_DIR zlib.h)

SET(ZLIB_NAMES z zlib zdll)
FIND_LIBRARY(ZLIB_LIBRARY NAMES ${ZLIB_NAMES} )
MARK_AS_ADVANCED( ZLIB_LIBRARY ZLIB_INCLUDE_DIR )

# Per-recommendation
SET(ZLIB_INCLUDE_DIRS "${ZLIB_INCLUDE_DIR}")
SET(ZLIB_LIBRARIES    "${ZLIB_LIBRARY}")

INCLUDE(CheckFunctionExists)
SET(CMAKE_REQUIRED_LIBRARIES ${ZLIB_LIBRARIES})
CHECK_FUNCTION_EXISTS("gzclearerr" HAVE_GZCLEARERR)
# reset
SET(CMAKE_REQUIRED_LIBRARIES "")

# handle the QUIETLY and REQUIRED arguments and set ZLIB_FOUND to TRUE if 
# all listed variables are TRUE
INCLUDE(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(ZLIB DEFAULT_MSG ZLIB_LIBRARIES ZLIB_INCLUDE_DIRS)