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873c6b48d6
This also makes sure the file is only rebuilt if the inputs change, saving on unnecessary rebuilds.
55 lines
1.7 KiB
CMake
55 lines
1.7 KiB
CMake
# Filename: ConcatenateToCXX.cmake
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#
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# Description: When run, creates a single C++ file which includes a const char[]
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# containing the bytes from one or more files.
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#
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# Usage:
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# This script is invoked via add_custom_target, like this:
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# cmake -D OUTPUT_FILE="out.cxx" -D SYMBOL_NAME=data -D INPUT_FILES="a.bin b.bin" -P ConcatenateToCXX.cmake
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#
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if(NOT CMAKE_SCRIPT_MODE_FILE)
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message(FATAL_ERROR "ConcatenateToCXX.cmake should not be included but run in script mode.")
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return()
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endif()
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if(NOT DEFINED OUTPUT_FILE)
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message(FATAL_ERROR "OUTPUT_FILE should be defined when running ConcatenateToCXX.cmake!")
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return()
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endif()
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if(NOT DEFINED SYMBOL_NAME)
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set(SYMBOL_NAME "data")
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endif()
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file(WRITE "${OUTPUT_FILE}" "/* Generated by CMake. DO NOT EDIT. */\
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extern const char ${SYMBOL_NAME}[];
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const char ${SYMBOL_NAME}[] = {\n")
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separate_arguments(INPUT_FILES)
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foreach(infile ${INPUT_FILES})
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file(APPEND "${OUTPUT_FILE}" " /* ${infile} */\n")
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set(offset 0)
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while(1)
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# Read up to 1024 bytes from the input file
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file(READ "${infile}" data LIMIT 1024 OFFSET ${offset} HEX)
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math(EXPR offset "${offset} + 1024")
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# If 'data' is empty, we're done
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if(NOT data)
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break()
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endif()
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# Format runs of up to 32 hex chars by indenting and giving a newline
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string(REGEX REPLACE
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"(...?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?.?)" " \\1\n"
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data "${data}")
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# Format each byte (2 hex chars) in each line with 0x prefix and comma suffix
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string(REGEX REPLACE "([0-9a-fA-F][0-9a-fA-F])" " 0x\\1," data "${data}")
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file(APPEND "${OUTPUT_FILE}" "${data}")
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endwhile()
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endforeach(infile)
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file(APPEND "${OUTPUT_FILE}" "};\n")
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