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# Derived from https://gitlab.com/jhamberg/cmake-examples/-/blob/master/cmake/FileEmbed.cmake
# MIT licensed
# Copyright (c) 2022 Jonathan Hamberg
function(FileEmbedSetup)
if (NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/file_embed)
file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}file_embed)
endif ()
if (NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/file_embed/file_embed_empty.c)
file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/file_embed/file_embed_empty.c "")
endif ()
add_library(file_embed ${CMAKE_CURRENT_BINARY_DIR}/file_embed/file_embed_empty.c)
target_include_directories(file_embed PUBLIC ${CMAKE_CURRENT_BINARY_DIR}/file_embed)
endfunction()
function(FileEmbedAdd file)
FileEmbedGenerate(${file} var)
target_sources(file_embed PUBLIC ${var})
add_custom_command(
OUTPUT ${var}
COMMAND ${CMAKE_COMMAND}
-DRUN_FILE_EMBED_GENERATE=1
"-DFILE_EMBED_GENERATE_PATH=${file}"
-P ${PROJECT_SOURCE_DIR}/cmake/FileEmbed.cmake
MAIN_DEPENDENCY ${file}
)
endfunction()
function(FileEmbedGenerate file generated_c)
get_filename_component(base_filename ${file} NAME)
set(output_filename "${base_filename}.c")
string(MAKE_C_IDENTIFIER ${base_filename} c_name)
file(READ ${file} content HEX)
string(LENGTH "${content}" size)
math(EXPR size_mult_16 "${size} - (${size} % 16)")
string(SUBSTRING "${content}" 0 ${size_mult_16} content_mult_16)
string(REGEX REPLACE
"([A-Fa-f0-9][A-Fa-f0-9])\
([A-Fa-f0-9][A-Fa-f0-9])\
([A-Fa-f0-9][A-Fa-f0-9])\
([A-Fa-f0-9][A-Fa-f0-9])\
([A-Fa-f0-9][A-Fa-f0-9])\
([A-Fa-f0-9][A-Fa-f0-9])\
([A-Fa-f0-9][A-Fa-f0-9])\
([A-Fa-f0-9][A-Fa-f0-9])"
"0x\\1,0x\\2,0x\\3,0x\\4,0x\\5,0x\\6,0x\\7,0x\\8,\n" SEPARATED_HEX "${content_mult_16}")
set(SEPARATED_HEX_REMAINDER "")
if (NOT ${size_mult_16} EQUAL ${size})
string(SUBSTRING "${content}" ${size_mult_16} 16 content_remainder)
string(REGEX REPLACE "([A-Fa-f0-9][A-Fa-f0-9])" "0x\\1," SEPARATED_HEX_REMAINDER "${content_remainder}")
endif()
set(output_c "${SEPARATED_HEX}${SEPARATED_HEX_REMAINDER}")
set(output_c "
#include \"${c_name}.h\"
const uint8_t ${c_name}_data[] = {
${output_c}
}\;
const unsigned ${c_name}_size = sizeof(${c_name}_data)\;
")
set(output_h "
#ifndef ${c_name}_H
#define ${c_name}_H
#include <stdint.h>
extern const uint8_t ${c_name}_data[]\;
extern const unsigned ${c_name}_size\;
#endif // ${c_name}_H
")
if (NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/file_embed)
file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}file_embed)
endif ()
file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/file_embed/${c_name}.c
${output_c})
file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/file_embed/${c_name}.h
${output_h})
set(${generated_c} ${CMAKE_CURRENT_BINARY_DIR}/file_embed/${c_name}.c PARENT_SCOPE)
endfunction()
if (RUN_FILE_EMBED_GENERATE)
FileEmbedGenerate(${FILE_EMBED_GENERATE_PATH} var)
endif ()
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