cmake_minimum_required(VERSION 3.2...3.15)
# set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS ON)

project(zlib VERSION 1.3.1 LANGUAGES C)

# ========= AudioCodecs =========
include(${CMAKE_CURRENT_SOURCE_DIR}/../audio_codec_common.cmake)

IF(NOT MSVC)
    ac_disable_c_warning_flag("implicit-fallthrough" IMPLICIT_FALLTHROUGH)
ELSE()
    add_definitions(-D_CRT_SECURE_NO_WARNINGS)
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /wd4100 /wd4244 /wd4005 /wd4013 /wd4047 /wd4996 /wd4267")
ENDIF()

if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX)
    # Turn on warnings and legacy C/C++ standards to support more compilers
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wno-pedantic -std=c99")
    add_definitions(-DSTDC) # WORKAROUND
endif()
# ========= AudioCodecs END =========

option(ASM686 "Enable building i686 assembly implementation")
option(AMD64 "Enable building amd64 assembly implementation")

set(INSTALL_BIN_DIR "bin" CACHE PATH "Installation directory for executables")
set(INSTALL_LIB_DIR "lib" CACHE PATH "Installation directory for libraries")
set(INSTALL_INC_DIR "include" CACHE PATH "Installation directory for headers")
set(INSTALL_MAN_DIR "share/man" CACHE PATH "Installation directory for manual pages")
set(INSTALL_PKGCONFIG_DIR "share/pkgconfig" CACHE PATH "Installation directory for pkgconfig (.pc) files")

include(CheckTypeSize)
include(CheckFunctionExists)
include(CheckIncludeFile)
include(CheckCSourceCompiles)
enable_testing()

check_include_file(sys/types.h HAVE_SYS_TYPES_H)
check_include_file(stdint.h    HAVE_STDINT_H)
check_include_file(stddef.h    HAVE_STDDEF_H)

#
# Check to see if we have large file support
#
set(CMAKE_REQUIRED_DEFINITIONS -D_LARGEFILE64_SOURCE=1)
# We add these other definitions here because CheckTypeSize.cmake
# in CMake 2.4.x does not automatically do so and we want
# compatibility with CMake 2.4.x.
if(HAVE_SYS_TYPES_H)
    list(APPEND CMAKE_REQUIRED_DEFINITIONS -DHAVE_SYS_TYPES_H)
endif()
if(HAVE_STDINT_H)
    list(APPEND CMAKE_REQUIRED_DEFINITIONS -DHAVE_STDINT_H)
endif()
if(HAVE_STDDEF_H)
    list(APPEND CMAKE_REQUIRED_DEFINITIONS -DHAVE_STDDEF_H)
endif()
check_type_size(off64_t OFF64_T)
if(HAVE_OFF64_T)
   add_definitions(-D_LARGEFILE64_SOURCE=1)
endif()
set(CMAKE_REQUIRED_DEFINITIONS) # clear variable

#
# Check for fseeko
#
check_function_exists(fseeko HAVE_FSEEKO)
if(NOT HAVE_FSEEKO)
    add_definitions(-DNO_FSEEKO)
endif()

#
# Check for unistd.h
#
check_include_file(unistd.h Z_HAVE_UNISTD_H)

if(MSVC)
    # set(CMAKE_DEBUG_POSTFIX "d")
    add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
    add_definitions(-D_CRT_NONSTDC_NO_DEPRECATE)
    include_directories(${CMAKE_CURRENT_SOURCE_DIR})
endif()

if(NOT CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR)
    # If we're doing an out of source build and the user has a zconf.h
    # in their source tree...
    if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/zlib/zconf.h)
        message(STATUS "Renaming")
        message(STATUS "    ${CMAKE_CURRENT_SOURCE_DIR}/zlib/zconf.h")
        message(STATUS "to 'zconf.h.included' because this file is included with zlib")
        message(STATUS "but CMake generates it automatically in the build directory.")
        file(RENAME ${CMAKE_CURRENT_SOURCE_DIR}/zlib/zconf.h ${CMAKE_CURRENT_SOURCE_DIR}/zlib/zconf.h.included)
    endif()
endif()

set(ZLIB_PC ${CMAKE_CURRENT_BINARY_DIR}/zlib.pc)
configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/zlib/zlib.pc.cmakein
        ${ZLIB_PC} @ONLY)
configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/zlib/zconf.h.cmakein
        ${CMAKE_CURRENT_BINARY_DIR}/zlib/zconf.h @ONLY)
include_directories(${CMAKE_CURRENT_BINARY_DIR}/zlib ${CMAKE_SOURCE_DIR})

# Copy for shared usage
configure_file( ${CMAKE_CURRENT_BINARY_DIR}/zlib/zconf.h
        ${CMAKE_BINARY_DIR}/zlib-include/zconf.h COPYONLY)
configure_file( ${CMAKE_CURRENT_SOURCE_DIR}/zlib/zlib.h
        ${CMAKE_BINARY_DIR}/zlib-include/zlib.h COPYONLY)


#============================================================================
# zlib
#============================================================================

set(ZLIB_PUBLIC_HDRS
        ${CMAKE_CURRENT_BINARY_DIR}/zlib/zconf.h
        zlib/zlib.h
        )
set(ZLIB_PRIVATE_HDRS
        zlib/crc32.h
        zlib/deflate.h
        zlib/gzguts.h
        zlib/inffast.h
        zlib/inffixed.h
        zlib/inflate.h
        zlib/inftrees.h
        zlib/trees.h
        zlib/zutil.h
        )
set(ZLIB_SRCS
        zlib/adler32.c
        zlib/compress.c
        zlib/crc32.c
        zlib/deflate.c
        zlib/gzclose.c
        zlib/gzlib.c
        zlib/gzread.c
        zlib/gzwrite.c
        zlib/inflate.c
        zlib/infback.c
        zlib/inftrees.c
        zlib/inffast.c
        zlib/trees.c
        zlib/uncompr.c
        zlib/zutil.c
        )

if(NOT MINGW)
    set(ZLIB_DLL_SRCS
        zlib/win32/zlib1.rc # If present will override custom build rule below.
    )
endif()

# parse the full version number from zlib.h and include in ZLIB_FULL_VERSION
file(READ ${CMAKE_CURRENT_SOURCE_DIR}/zlib/zlib.h _zlib_h_contents)
string(REGEX REPLACE ".*#define[ \t]+ZLIB_VERSION[ \t]+\"([-0-9A-Za-z.]+)\".*"
    "\\1" ZLIB_FULL_VERSION ${_zlib_h_contents})

if(MINGW)
    # This gets us DLL resource information when compiling on MinGW.
    if(NOT CMAKE_RC_COMPILER)
        set(CMAKE_RC_COMPILER windres.exe)
    endif()

    add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj
                       COMMAND ${CMAKE_RC_COMPILER}
                            -D GCC_WINDRES
                            -I ${CMAKE_CURRENT_SOURCE_DIR}/zlib/
                            -I ${CMAKE_CURRENT_BINARY_DIR}
                            -o ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj
                            -i ${CMAKE_CURRENT_SOURCE_DIR}/zlib/win32/zlib1.rc)
    set(ZLIB_DLL_SRCS ${CMAKE_CURRENT_BINARY_DIR}/zlib1rc.obj)
endif(MINGW)

#add_library(zlib SHARED ${ZLIB_SRCS} ${ZLIB_DLL_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
#target_include_directories(zlibstatic PUBLIC ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})
add_library(zlibstatic STATIC ${ZLIB_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
target_include_directories(zlibstatic PUBLIC ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})
#set_target_properties(zlib PROPERTIES DEFINE_SYMBOL ZLIB_DLL)
#set_target_properties(zlib PROPERTIES SOVERSION 1)

#if(NOT CYGWIN)
#    # This property causes shared libraries on Linux to have the full version
#    # encoded into their final filename.  We disable this on Cygwin because
#    # it causes cygz-${ZLIB_FULL_VERSION}.dll to be created when cygz.dll
#    # seems to be the default.
#    #
#    # This has no effect with MSVC, on that platform the version info for
#    # the DLL comes from the resource file win32/zlib1.rc
#    set_target_properties(zlib PROPERTIES VERSION ${ZLIB_FULL_VERSION})
#endif()

set_target_properties(zlibstatic PROPERTIES OUTPUT_NAME zlib)
#if(UNIX)
#    # On unix-like platforms the library is almost always called libz
#    set_target_properties(zlib zlibstatic PROPERTIES OUTPUT_NAME z)
#    if(NOT APPLE AND NOT(CMAKE_SYSTEM_NAME STREQUAL AIX))
#        set_target_properties(zlib PROPERTIES LINK_FLAGS "-Wl,--version-script,\"${CMAKE_CURRENT_SOURCE_DIR}/zlib/zlib.map\"")
#    endif()
#elseif(BUILD_SHARED_LIBS AND WIN32)
#    # Creates zlib1.dll when building shared library version
#    set_target_properties(zlib PROPERTIES SUFFIX "1.dll")
#endif()

if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
    # install(TARGETS zlib zlibstatic
    install(TARGETS zlibstatic
        RUNTIME DESTINATION "${INSTALL_BIN_DIR}"
        ARCHIVE DESTINATION "${INSTALL_LIB_DIR}"
        LIBRARY DESTINATION "${INSTALL_LIB_DIR}" )
endif()
if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
    install(FILES ${ZLIB_PUBLIC_HDRS} DESTINATION "${INSTALL_INC_DIR}")
endif()
if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
    install(FILES zlib/zlib.3 DESTINATION "${INSTALL_MAN_DIR}/man3")
endif()
if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
    install(FILES ${ZLIB_PC} DESTINATION "${INSTALL_PKGCONFIG_DIR}")
endif()

#============================================================================
# Example binaries
#============================================================================

#add_executable(example test/example.c)
#target_link_libraries(example zlib)
#add_test(example example)
#
#add_executable(minigzip test/minigzip.c)
#target_link_libraries(minigzip zlib)
#
#if(HAVE_OFF64_T)
#    add_executable(example64 test/example.c)
#    target_link_libraries(example64 zlib)
#    set_target_properties(example64 PROPERTIES COMPILE_FLAGS "-D_FILE_OFFSET_BITS=64")
#    add_test(example64 example64)
#
#    add_executable(minigzip64 test/minigzip.c)
#    target_link_libraries(minigzip64 zlib)
#    set_target_properties(minigzip64 PROPERTIES COMPILE_FLAGS "-D_FILE_OFFSET_BITS=64")
#endif()
