# Copyright (C) 1995-2019, Rene Brun and Fons Rademakers.
# All rights reserved.
#
# For the licensing terms see $ROOTSYS/LICENSE.
# For the list of contributors see $ROOTSYS/README/CREDITS.

project(LZ4 C)

find_package(xxHash REQUIRED)

set(LZ4_PUBLIC_HEADERS
  lz4.h
  lz4frame.h
  lz4hc.h
)

set(LZ4_PRIVATE_HEADERS
  lz4frame_static.h
)

set(LZ4_SOURCES
  lz4.c
  lz4frame.c
  lz4hc.c
)

unset(LZ4_FOUND CACHE)
unset(LZ4_FOUND PARENT_SCOPE)
set(LZ4_FOUND TRUE CACHE BOOL "" FORCE)

file(STRINGS "lz4.h" LZ4_H REGEX "^#define LZ4_VERSION_[A-Z]+[ ]+[0-9]+.*$")
string(REGEX REPLACE ".+LZ4_VERSION_MAJOR[ ]+([0-9]+).*$"   "\\1" LZ4_VERSION_MAJOR "${LZ4_H}")
string(REGEX REPLACE ".+LZ4_VERSION_MINOR[ ]+([0-9]+).*$"   "\\1" LZ4_VERSION_MINOR "${LZ4_H}")
string(REGEX REPLACE ".+LZ4_VERSION_RELEASE[ ]+([0-9]+).*$" "\\1" LZ4_VERSION_PATCH "${LZ4_H}")
set(LZ4_VERSION_STRING "${LZ4_VERSION_MAJOR}.${LZ4_VERSION_MINOR}.${LZ4_VERSION_PATCH}")
unset(LZ4_H)

set(LZ4_VERSION ${LZ4_VERSION_STRING} CACHE INTERNAL "" FORCE)
set(LZ4_VERSION_STRING ${LZ4_VERSION_STRING} CACHE INTERNAL "" FORCE)

set(LZ4_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR} CACHE INTERNAL "" FORCE)
set(LZ4_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR} CACHE INTERNAL "" FORCE)
mark_as_advanced(LZ4_INCLUDE_DIR)

add_library(lz4 STATIC ${LZ4_PUBLIC_HEADERS} ${LZ4_PRIVATE_HEADERS} ${LZ4_SOURCES})
set_target_properties(lz4 PROPERTIES C_VISIBILITY_PRESET hidden POSITION_INDEPENDENT_CODE ON)
target_include_directories(lz4
  PRIVATE ${xxHash_INCLUDE_DIR} ${LZ4_INCLUDE_DIR}
  INTERFACE $<BUILD_INTERFACE:${LZ4_INCLUDE_DIR}>
)

add_library(LZ4::LZ4 ALIAS lz4)

set(LZ4_LIBRARY $<TARGET_FILE:lz4> CACHE INTERNAL "")
set(LZ4_LIBRARIES LZ4::LZ4 CACHE INTERNAL "")

set_property(GLOBAL APPEND PROPERTY ROOT_BUILTIN_TARGETS LZ4::LZ4)