# Ubuntu 12.04 LTS has CMake 2.8.7, and is an important target since
# several CI services, such as Travis and Drone, use it.  Solaris 11
# has 2.8.6, and it's not difficult to support if you already have to
# support 2.8.7.
cmake_minimum_required(VERSION 2.8.6)

project(brotli C)

include(CheckCSourceCompiles)
check_c_source_compiles(
  "#if defined(__EMSCRIPTEN__)
   int main() {return 0;}
   #endif"
  BROTLI_EMSCRIPTEN
)
if (BROTLI_EMSCRIPTEN)
  message("-- Compiler is EMSCRIPTEN")
else()
  message("-- Compiler is not EMSCRIPTEN")
endif()

# If Brotli is being bundled in another project, we don't want to
# install anything.  However, we want to let people override this, so
# we'll use the BROTLI_BUNDLED_MODE variable to let them do that; just
# set it to OFF in your project before you add_subdirectory(brotli).
get_directory_property(BROTLI_PARENT_DIRECTORY PARENT_DIRECTORY)
if(NOT DEFINED BROTLI_BUNDLED_MODE)
  # Bundled mode hasn't been set one way or the other, set the default
  # depending on whether or not we are the top-level project.
  if(BROTLI_PARENT_DIRECTORY)
    set(BROTLI_BUNDLED_MODE ON)
  else()
    set(BROTLI_BUNDLED_MODE OFF)
  endif()
endif()
mark_as_advanced(BROTLI_BUNDLED_MODE)

include(GNUInstallDirs)

# Parse version information from common/version.h. Normally we would
# define these values here and write them out to configuration file(s)
# (i.e., config.h), but in this case we parse them from
# common/version.h to be less intrusive.
function(hex_to_dec HEXADECIMAL DECIMAL)
  string(TOUPPER "${HEXADECIMAL}" _tail)
  set(_decimal 0)
  string(LENGTH "${_tail}" _tail_length)
  while (_tail_length GREATER 0)
    math(EXPR _decimal "${_decimal} * 16")
    string(SUBSTRING "${_tail}" 0 1 _digit)
    string(SUBSTRING "${_tail}" 1 -1 _tail)
    if (_digit STREQUAL "A")
      math(EXPR _decimal "${_decimal} + 10")
    elseif (_digit STREQUAL "B")
      math(EXPR _decimal "${_decimal} + 11")
    elseif (_digit STREQUAL "C")
      math(EXPR _decimal "${_decimal} + 12")
    elseif (_digit STREQUAL "D")
      math(EXPR _decimal "${_decimal} + 13")
    elseif (_digit STREQUAL "E")
      math(EXPR _decimal "${_decimal} + 14")
    elseif (_digit STREQUAL "F")
      math(EXPR _decimal "${_decimal} + 15")
    else()
      math(EXPR _decimal "${_decimal} + ${_digit}")
    endif()
    string(LENGTH "${_tail}" _tail_length)
  endwhile()
  set(${DECIMAL} ${_decimal} PARENT_SCOPE)
endfunction(hex_to_dec)

# Version information
file(STRINGS "c/common/version.h" _brotli_version_line REGEX "^#define BROTLI_VERSION (0x[0-9a-fA-F]+)$")
string(REGEX REPLACE "^#define BROTLI_VERSION 0x([0-9a-fA-F]+)$" "\\1" _brotli_version_hex "${_brotli_version_line}")
hex_to_dec("${_brotli_version_hex}" _brotli_version)
math(EXPR BROTLI_VERSION_MAJOR "${_brotli_version} >> 24")
math(EXPR BROTLI_VERSION_MINOR "(${_brotli_version} >> 12) & 4095")
math(EXPR BROTLI_VERSION_PATCH "${_brotli_version} & 4095")
set(BROTLI_VERSION "${BROTLI_VERSION_MAJOR}.${BROTLI_VERSION_MINOR}.${BROTLI_VERSION_PATCH}")
mark_as_advanced(BROTLI_VERSION BROTLI_VERSION_MAJOR BROTLI_VERSION_MINOR BROTLI_VERSION_PATCH)

# ABI Version information
file(STRINGS "c/common/version.h" _brotli_abi_info_line REGEX "^#define BROTLI_ABI_VERSION (0x[0-9a-fA-F]+)$")
string(REGEX REPLACE "^#define BROTLI_ABI_VERSION 0x([0-9a-fA-F]+)$" "\\1" _brotli_abi_info_hex "${_brotli_abi_info_line}")
hex_to_dec("${_brotli_abi_info_hex}" _brotli_abi_info)
math(EXPR BROTLI_ABI_CURRENT "${_brotli_abi_info} >> 24")
math(EXPR BROTLI_ABI_REVISION "(${_brotli_abi_info} >> 12) & 4095")
math(EXPR BROTLI_ABI_AGE "${_brotli_abi_info} & 4095")
math(EXPR BROTLI_ABI_COMPATIBILITY "${BROTLI_ABI_CURRENT} - ${BROTLI_ABI_AGE}")
mark_as_advanced(BROTLI_ABI_CURRENT BROTLI_ABI_REVISION BROTLI_ABI_AGE BROTLI_ABI_COMPATIBILITY)

if (ENABLE_SANITIZER)
  set(CMAKE_C_FLAGS " ${CMAKE_C_FLAGS} -fsanitize=${ENABLE_SANITIZER}")
  set(CMAKE_CXX_FLAGS " ${CMAKE_CXX_FLAGS} -fsanitize=${ENABLE_SANITIZER}")
  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=${ENABLE_SANITIZER}")

  # By default, brotli depends on undefined behavior, but setting
  # BROTLI_BUILD_PORTABLE should result in a build which does not.
  if(ENABLE_SANITIZER STREQUAL "undefined")
    add_definitions(-DBROTLI_BUILD_PORTABLE)
  endif()
endif ()

include(CheckFunctionExists)
set(LIBM_LIBRARY)
CHECK_FUNCTION_EXISTS(log2 LOG2_RES)
if(NOT LOG2_RES)
  set(orig_req_libs "${CMAKE_REQUIRED_LIBRARIES}")
  set(CMAKE_REQUIRED_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES};m")
  CHECK_FUNCTION_EXISTS(log2 LOG2_LIBM_RES)
  if(LOG2_LIBM_RES)
    set(LIBM_LIBRARY "m")
  else()
    message(FATAL_ERROR "log2() not found")
  endif()

  set(CMAKE_REQUIRED_LIBRARIES "${orig_req_libs}")
  unset(LOG2_LIBM_RES)
  unset(orig_req_libs)
endif()
unset(LOG2_RES)

set(BROTLI_INCLUDE_DIRS "${CMAKE_CURRENT_SOURCE_DIR}/c/include")
mark_as_advanced(BROTLI_INCLUDE_DIRS)

set(BROTLI_LIBRARIES_CORE brotlienc brotlidec brotlicommon)
set(BROTLI_LIBRARIES ${BROTLI_LIBRARIES_CORE} ${LIBM_LIBRARY})
mark_as_advanced(BROTLI_LIBRARIES)

set(BROTLI_LIBRARIES_CORE_STATIC brotlienc-static brotlidec-static brotlicommon-static)
set(BROTLI_LIBRARIES_STATIC ${BROTLI_LIBRARIES_CORE_STATIC} ${LIBM_LIBRARY})
mark_as_advanced(BROTLI_LIBRARIES_STATIC)

if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
  add_definitions(-DOS_LINUX)
elseif(${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
  add_definitions(-DOS_FREEBSD)
elseif(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
  add_definitions(-DOS_MACOSX)
endif()

function(transform_sources_list INPUT_FILE OUTPUT_FILE)
  file(READ ${INPUT_FILE} TEXT)
  string(REGEX REPLACE "\\\\\n" "~continuation~" TEXT ${TEXT})
  string(REGEX REPLACE "([a-zA-Z_][a-zA-Z0-9_]*)[\t ]*=[\t ]*([^\n]*)" "SET(\\1 \\2)" TEXT ${TEXT})
  string(REPLACE "~continuation~" "\n" TEXT ${TEXT})
  file(WRITE ${OUTPUT_FILE} ${TEXT})
endfunction()

transform_sources_list("scripts/sources.lst" "${CMAKE_CURRENT_BINARY_DIR}/sources.lst.cmake")
include("${CMAKE_CURRENT_BINARY_DIR}/sources.lst.cmake")

if(BROTLI_EMSCRIPTEN)
  set(BROTLI_SHARED_LIBS "")
else()
  set(BROTLI_SHARED_LIBS brotlicommon brotlidec brotlienc)
  add_library(brotlicommon SHARED ${BROTLI_COMMON_C})
  add_library(brotlidec SHARED ${BROTLI_DEC_C})
  add_library(brotlienc SHARED ${BROTLI_ENC_C})
endif()

set(BROTLI_STATIC_LIBS brotlicommon-static brotlidec-static brotlienc-static)
add_library(brotlicommon-static STATIC ${BROTLI_COMMON_C})
add_library(brotlidec-static STATIC ${BROTLI_DEC_C})
add_library(brotlienc-static STATIC ${BROTLI_ENC_C})

# Older CMake versions does not understand INCLUDE_DIRECTORIES property.
include_directories(${BROTLI_INCLUDE_DIRS})

foreach(lib IN LISTS BROTLI_SHARED_LIBS)
  target_compile_definitions(${lib} PUBLIC "BROTLI_SHARED_COMPILATION" )
  string(TOUPPER "${lib}" LIB)
  set_target_properties (${lib} PROPERTIES DEFINE_SYMBOL "${LIB}_SHARED_COMPILATION")
endforeach()

foreach(lib IN LISTS BROTLI_SHARED_LIBS BROTLI_STATIC_LIBS)
  target_link_libraries(${lib} ${LIBM_LIBRARY})
  set_property(TARGET ${lib} APPEND PROPERTY INCLUDE_DIRECTORIES ${BROTLI_INCLUDE_DIRS})
  set_target_properties(${lib} PROPERTIES
    VERSION "${BROTLI_ABI_COMPATIBILITY}.${BROTLI_ABI_AGE}.${BROTLI_ABI_REVISION}"
    SOVERSION "${BROTLI_ABI_COMPATIBILITY}")
  if(NOT BROTLI_EMSCRIPTEN)
    set_target_properties(${lib} PROPERTIES POSITION_INDEPENDENT_CODE TRUE)
  endif()
  set_property(TARGET ${lib} APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES "${BROTLI_INCLUDE_DIRS}")
endforeach()

if(NOT BROTLI_EMSCRIPTEN)
target_link_libraries(brotlidec brotlicommon)
target_link_libraries(brotlienc brotlicommon)
endif()

target_link_libraries(brotlidec-static brotlicommon-static)
target_link_libraries(brotlienc-static brotlicommon-static)

# For projects stuck on older versions of CMake, this will set the
# BROTLI_INCLUDE_DIRS and BROTLI_LIBRARIES variables so they still
# have a relatively easy way to use Brotli:
#
#   include_directories(${BROTLI_INCLUDE_DIRS})
#   target_link_libraries(foo ${BROTLI_LIBRARIES})
if(BROTLI_PARENT_DIRECTORY)
  set(BROTLI_INCLUDE_DIRS "${BROTLI_INCLUDE_DIRS}" PARENT_SCOPE)
  set(BROTLI_LIBRARIES "${BROTLI_LIBRARIES}" PARENT_SCOPE)
endif()

# Build the brotli executable
add_executable(brotli ${BROTLI_CLI_C})
target_link_libraries(brotli ${BROTLI_LIBRARIES_STATIC})

# Installation
if(NOT BROTLI_EMSCRIPTEN)
if(NOT BROTLI_BUNDLED_MODE)
  install(
    TARGETS brotli
    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
  )

  install(
    TARGETS ${BROTLI_LIBRARIES_CORE}
    ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
  )

  install(
    TARGETS ${BROTLI_LIBRARIES_CORE_STATIC}
    ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
  )

  install(
    DIRECTORY ${BROTLI_INCLUDE_DIRS}/brotli
    DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
  )
endif()  # BROTLI_BUNDLED_MODE
endif()  # BROTLI_EMSCRIPTEN

# Tests

# If we're targeting Windows but not running on Windows, we need Wine
# to run the tests...
if(NOT BROTLI_DISABLE_TESTS)
  if(WIN32 AND NOT CMAKE_HOST_WIN32)
    find_program(BROTLI_WRAPPER NAMES wine)

    if(NOT BROTLI_WRAPPER)
      message(STATUS "wine not found, disabling tests")
      set(BROTLI_DISABLE_TESTS TRUE)
    endif()
  endif()
endif()

# If our compiler is a cross-compiler that we know about (arm/aarch64),
# then we need to use qemu to execute the tests.
if(NOT BROTLI_DISABLE_TESTS)
  if ("${CMAKE_C_COMPILER}" MATCHES "^.*/arm-linux-gnueabihf-.*$")
    message(STATUS "Detected arm-linux-gnueabihf cross-compilation")
    set(BROTLI_WRAPPER "qemu-arm")
    set(BROTLI_WRAPPER_LD_PREFIX "/usr/arm-linux-gnueabihf")
  endif()

  if ("${CMAKE_C_COMPILER}" MATCHES "^.*/arm-linux-gnueabi-.*$")
    message(STATUS "Detected arm-linux-gnueabi cross-compilation")
    set(BROTLI_WRAPPER "qemu-arm")
    set(BROTLI_WRAPPER_LD_PREFIX "/usr/arm-linux-gnueabi")
  endif()

  if ("${CMAKE_C_COMPILER}" MATCHES "^.*/aarch64-linux-gnu-.*$")
    message(STATUS "Detected aarch64-linux-gnu cross-compilation")
    set(BROTLI_WRAPPER "qemu-aarch64")
    set(BROTLI_WRAPPER_LD_PREFIX "/usr/aarch64-linux-gnu")
  endif()
endif()

if(NOT BROTLI_DISABLE_TESTS)
  include(CTest)
  enable_testing()

  set(ROUNDTRIP_INPUTS
    tests/testdata/alice29.txt
    tests/testdata/asyoulik.txt
    tests/testdata/lcet10.txt
    tests/testdata/plrabn12.txt
    c/enc/encode.c
    c/common/dictionary.h
    c/dec/decode.c)

  foreach(INPUT ${ROUNDTRIP_INPUTS})
    get_filename_component(OUTPUT_NAME "${INPUT}" NAME)

    set(OUTPUT_FILE "${CMAKE_CURRENT_BINARY_DIR}/${OUTPUT_NAME}")
    set(INPUT_FILE "${CMAKE_CURRENT_SOURCE_DIR}/${INPUT}")

    foreach(quality 1 6 9 11)
      add_test(NAME "${BROTLI_TEST_PREFIX}roundtrip/${INPUT}/${quality}"
        COMMAND "${CMAKE_COMMAND}"
          -DBROTLI_WRAPPER=${BROTLI_WRAPPER}
          -DBROTLI_WRAPPER_LD_PREFIX=${BROTLI_WRAPPER_LD_PREFIX}
          -DBROTLI_CLI=$<TARGET_FILE:brotli>
          -DQUALITY=${quality}
          -DINPUT=${INPUT_FILE}
          -DOUTPUT=${OUTPUT_FILE}.${quality}
          -P ${CMAKE_CURRENT_SOURCE_DIR}/tests/run-roundtrip-test.cmake)
    endforeach()
  endforeach()

  file(GLOB_RECURSE
    COMPATIBILITY_INPUTS
    RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
    tests/testdata/*.compressed*)

  foreach(INPUT ${COMPATIBILITY_INPUTS})
    add_test(NAME "${BROTLI_TEST_PREFIX}compatibility/${INPUT}"
      COMMAND "${CMAKE_COMMAND}"
        -DBROTLI_WRAPPER=${BROTLI_WRAPPER}
        -DBROTLI_WRAPPER_LD_PREFIX=${BROTLI_WRAPPER_LD_PREFIX}
        -DBROTLI_CLI=$<TARGET_FILE:brotli>
        -DINPUT=${CMAKE_CURRENT_SOURCE_DIR}/${INPUT}
        -P ${CMAKE_CURRENT_SOURCE_DIR}/tests/run-compatibility-test.cmake)
  endforeach()
endif()

# Generate a pkg-config files

function(generate_pkg_config_path outvar path)
  string(LENGTH "${path}" path_length)

  set(path_args ${ARGV})
  list(REMOVE_AT path_args 0 1)
  list(LENGTH path_args path_args_remaining)

  set("${outvar}" "${path}")

  while(path_args_remaining GREATER 1)
    list(GET path_args 0 name)
    list(GET path_args 1 value)

    get_filename_component(value_full "${value}" ABSOLUTE)
    string(LENGTH "${value}" value_length)

    if(path_length EQUAL value_length AND path STREQUAL value)
      set("${outvar}" "\${${name}}")
      break()
    elseif(path_length GREATER value_length)
      # We might be in a subdirectory of the value, but we have to be
      # careful about a prefix matching but not being a subdirectory
      # (for example, /usr/lib64 is not a subdirectory of /usr/lib).
      # We'll do this by making sure the next character is a directory
      # separator.
      string(SUBSTRING "${path}" ${value_length} 1 sep)
      if(sep STREQUAL "/")
        string(SUBSTRING "${path}" 0 ${value_length} s)
        if(s STREQUAL value)
          string(SUBSTRING "${path}" "${value_length}" -1 suffix)
          set("${outvar}" "\${${name}}${suffix}")
          break()
        endif()
      endif()
    endif()

    list(REMOVE_AT path_args 0 1)
    list(LENGTH path_args path_args_remaining)
  endwhile()

  set("${outvar}" "${${outvar}}" PARENT_SCOPE)
endfunction(generate_pkg_config_path)

function(transform_pc_file INPUT_FILE OUTPUT_FILE VERSION)
  file(READ ${INPUT_FILE} TEXT)

  set(PREFIX "${CMAKE_INSTALL_PREFIX}")
  string(REGEX REPLACE "@prefix@" "${PREFIX}" TEXT ${TEXT})
  string(REGEX REPLACE "@exec_prefix@" "${PREFIX}" TEXT ${TEXT})

  generate_pkg_config_path(LIBDIR "${CMAKE_INSTALL_FULL_LIBDIR}" prefix "${PREFIX}")
  string(REGEX REPLACE "@libdir@" "${LIBDIR}" TEXT ${TEXT})

  generate_pkg_config_path(INCLUDEDIR "${CMAKE_INSTALL_FULL_INCLUDEDIR}" prefix "${PREFIX}")
  string(REGEX REPLACE "@includedir@" "${INCLUDEDIR}" TEXT ${TEXT})

  string(REGEX REPLACE "@PACKAGE_VERSION@" "${VERSION}" TEXT ${TEXT})

  file(WRITE ${OUTPUT_FILE} ${TEXT})
endfunction()

transform_pc_file("scripts/libbrotlicommon.pc.in" "${CMAKE_CURRENT_BINARY_DIR}/libbrotlicommon.pc" "${BROTLI_VERSION}")

transform_pc_file("scripts/libbrotlidec.pc.in" "${CMAKE_CURRENT_BINARY_DIR}/libbrotlidec.pc" "${BROTLI_VERSION}")

transform_pc_file("scripts/libbrotlienc.pc.in" "${CMAKE_CURRENT_BINARY_DIR}/libbrotlienc.pc" "${BROTLI_VERSION}")

if(NOT BROTLI_EMSCRIPTEN)
if(NOT BROTLI_BUNDLED_MODE)
  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/libbrotlicommon.pc"
    DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/libbrotlidec.pc"
    DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/libbrotlienc.pc"
    DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
endif()  # BROTLI_BUNDLED_MODE
endif()  # BROTLI_EMSCRIPTEN

if (ENABLE_COVERAGE STREQUAL "yes")
  SETUP_TARGET_FOR_COVERAGE(coverage test coverage)
endif ()
