# The following variable can be defined on the command line:
#
#   BUILD_SHARED_LIBS
#
# The following environment variables will be taken into account when running
# cmake for the first time:
#
#   CFLAGS
#   LDFLAGS

cmake_minimum_required(VERSION 3.1)
project(ls-qpack 
	LANGUAGES C
        HOMEPAGE_URL "https://github.com/litespeedtech/ls-qpack"
        DESCRIPTION "QPACK compression library for use with HTTP/3" 
        VERSION 2.6.2)

option(LSQPACK_TESTS "Build tests")
option(LSQPACK_BIN "Build binaries" ON)
option(LSQPACK_XXH "Include XXH" ON)
option(BUILD_SHARED_LIBS OFF)

# Use `cmake -DBUILD_SHARED_LIBS=OFF` to build a static library.
add_library(ls-qpack "")
add_library(ls-qpack::ls-qpack ALIAS ls-qpack)
set_target_properties(ls-qpack PROPERTIES
	VERSION ${PROJECT_VERSION}
	SOVERSION ${PROJECT_VERSION_MAJOR})
target_include_directories(ls-qpack PUBLIC 
    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
    $<INSTALL_INTERFACE:include>
)
target_sources(ls-qpack PRIVATE lsqpack.c)

if(LSQPACK_XXH)
    target_include_directories(ls-qpack PRIVATE deps/xxhash/)
    target_sources(ls-qpack PRIVATE deps/xxhash/xxhash.c)
    set(LSQPACK_DEPENDS "")
else()
    find_package(xxHash CONFIG)
    if(NOT xxHash_FOUND)
        find_package(PkgConfig REQUIRED)
        pkg_check_modules(LS_QPACK_XXH REQUIRED IMPORTED_TARGET libxxhash GLOBAL)
        add_library(xxHash::xxhash ALIAS PkgConfig::LS_QPACK_XXH)
    endif()
    target_link_libraries(ls-qpack PRIVATE xxHash::xxhash)
    set(LSQPACK_DEPENDS "libxxhash")
endif()

if(WIN32 OR EMSCRIPTEN)
    target_include_directories(ls-qpack PUBLIC
        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/wincompat>
        $<INSTALL_INTERFACE:include>
    )
endif()

if(MSVC)
    target_compile_options(ls-qpack PRIVATE
        /Wall
        /wd4100 # unreffed parameter
        /wd4200 # zero-sized array
        # Apparently this C99 construct is not supported properly by VS:
        #   https://stackoverflow.com/questions/1064930/struct-initializer-typedef-with-visual-studio
        /wd4204 # non-constant aggregate initializer
        /wd4255 # no function prototype (getopt)
        /wd4334 # result of 32-bit shift implicitly converted to 64 bits
        /wd4820 # padding
        /wd4668 # undefined macro
        /wd4710 # not inlined by default
        /wd4996 # unsafe function
        /wd4061 # enum is not explicitly handled by a case
        /wd5045 # Compiler will insert Spectre mitigation for memory load
    )
else()
    target_compile_options(ls-qpack PRIVATE
        -Wall
        -Wextra
        -Wno-unused-parameter
        -fno-omit-frame-pointer
    )
endif()

IF (CMAKE_SYSTEM_NAME STREQUAL Windows)
    IF (LSQPACK_TESTS OR LSQPACK_BIN)
        FIND_PATH(GETOPT_INCLUDE_DIR NAMES getopt.h)
        IF (GETOPT_INCLUDE_DIR)
            INCLUDE_DIRECTORIES(${GETOPT_INCLUDE_DIR})
        ELSE()
            MESSAGE(FATAL_ERROR "getopt.h was not found")
        ENDIF()
            FIND_LIBRARY(GETOPT_LIB getopt)
        IF(GETOPT_LIB)
            MESSAGE(STATUS "Found getopt: ${GETOPT_LIB}")
        ELSE()
            MESSAGE(STATUS "getopt not found")
        ENDIF()
    ENDIF()
ENDIF()

IF(DEFINED LSXPACK_MAX_STRLEN)
    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DLSXPACK_MAX_STRLEN=${LSXPACK_MAX_STRLEN}")
ENDIF()

IF (CMAKE_BUILD_TYPE STREQUAL MinSizeRel)
    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DLS_QPACK_USE_LARGE_TABLES=0")
ENDIF()

IF(LSQPACK_TESTS)
    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DLSQPACK_DEVEL_MODE=1")
ENDIF()

INCLUDE(CheckCCompilerFlag)
CHECK_C_COMPILER_FLAG(-Wno-implicit-fallthrough HAS_NO_IMPLICIT_FALLTHROUGH)
IF (HAS_NO_IMPLICIT_FALLTHROUGH)
    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-implicit-fallthrough")
ENDIF()

SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} $ENV{EXTRA_CFLAGS}")
MESSAGE(STATUS "Compiler flags: ${CMAKE_C_FLAGS}")

if(LSQPACK_TESTS)
    enable_testing()
    add_subdirectory(test)
endif()

# The executables are used within the test suite as well.
if(LSQPACK_BIN OR LSQPACK_TESTS)
    add_subdirectory(bin)
endif()

include(GNUInstallDirs)
configure_file(lsqpack.pc.in lsqpack.pc @ONLY)
install(FILES "${CMAKE_CURRENT_BINARY_DIR}/lsqpack.pc"
    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)

configure_file(ls-qpack-config.cmake.in ls-qpack-config.cmake @ONLY)
install(TARGETS ls-qpack EXPORT ls-qpack-config
        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
install(FILES "${CMAKE_CURRENT_BINARY_DIR}/ls-qpack-config.cmake"
    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/ls-qpack)
install(
    EXPORT ls-qpack-config
    FILE ls-qpack-targets.cmake
    NAMESPACE ls-qpack::
    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/ls-qpack
)
install(FILES lsqpack.h lsxpack_header.h
	DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})

if(LSQPACK_BIN)
    install(TARGETS
            encode-int
            fuzz-decode
            interop-decode
            interop-encode
            RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
endif()

if(WIN32 OR EMSCRIPTEN)
    install(DIRECTORY wincompat/sys DESTINATION include)
endif()