CMake/Tests/RunCMake/File_Archive/compression-level.cmake

foreach(parameter OUTPUT_NAME ARCHIVE_FORMAT)
  if(NOT DEFINED ${parameter})
    message(FATAL_ERROR "missing required parameter ${parameter}")
  endif()
endforeach()

set(COMPRESS_DIR compress_dir)
set(FULL_COMPRESS_DIR ${CMAKE_CURRENT_BINARY_DIR}/${COMPRESS_DIR})

set(DECOMPRESS_DIR decompress_dir)
set(FULL_DECOMPRESS_DIR ${CMAKE_CURRENT_BINARY_DIR}/${DECOMPRESS_DIR})

set(FULL_OUTPUT_NAME ${CMAKE_CURRENT_BINARY_DIR}/${OUTPUT_NAME})

set(CHECK_FILES
  "f1.txt"
  "d1/f1.txt"
  "d 2/f1.txt"
  "d + 3/f1.txt"
  "d_4/f1.txt"
  "d-4/f1.txt"
  "My Special Directory/f1.txt"
)

function(check_compression_level COMPRESSION_LEVEL)
  foreach(file ${CHECK_FILES})
    configure_file(${CMAKE_CURRENT_LIST_FILE} ${FULL_COMPRESS_DIR}/${file} COPYONLY)
  endforeach()

  if(UNIX)
    execute_process(COMMAND ln -sf f1.txt ${FULL_COMPRESS_DIR}/d1/f2.txt)
    list(APPEND CHECK_FILES "d1/f2.txt")
  endif()

  file(REMOVE ${FULL_OUTPUT_NAME})
  file(REMOVE_RECURSE ${FULL_DECOMPRESS_DIR})
  file(MAKE_DIRECTORY ${FULL_DECOMPRESS_DIR})

  file(ARCHIVE_CREATE
    OUTPUT ${FULL_OUTPUT_NAME}
    FORMAT "${ARCHIVE_FORMAT}"
    COMPRESSION "${COMPRESSION_TYPE}"
    COMPRESSION_LEVEL ${COMPRESSION_LEVEL}
    VERBOSE
    PATHS ${COMPRESS_DIR})

  file(ARCHIVE_EXTRACT
    INPUT ${FULL_OUTPUT_NAME}
    ${DECOMPRESSION_OPTIONS}
    DESTINATION ${FULL_DECOMPRESS_DIR}
    VERBOSE)

  if(CUSTOM_CHECK_FILES)
    set(CHECK_FILES ${CUSTOM_CHECK_FILES})
  endif()

  foreach(file ${CHECK_FILES})
    set(input ${FULL_COMPRESS_DIR}/${file})
    set(output ${FULL_DECOMPRESS_DIR}/${COMPRESS_DIR}/${file})

    if(NOT EXISTS ${input})
      message(SEND_ERROR "Cannot find input file ${output}")
    endif()

    if(NOT EXISTS ${output})
      message(SEND_ERROR "Cannot find output file ${output}")
    endif()

    file(MD5 ${input} input_md5)
    file(MD5 ${output} output_md5)

    if(NOT input_md5 STREQUAL output_md5)
      message(SEND_ERROR "Files \"${input}\" and \"${output}\" are different")
    endif()
  endforeach()

  foreach(file ${NOT_EXISTING_FILES_CHECK})
    set(output ${FULL_DECOMPRESS_DIR}/${COMPRESS_DIR}/${file})

    if(EXISTS ${output})
      message(SEND_ERROR "File ${output} exists but it shouldn't")
    endif()
  endforeach()

endfunction()