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Fix font header generation hang (#16) #19

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Fix font header generation hang (#16) #19

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37 changes: 12 additions & 25 deletions bin2header.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -4,31 +4,18 @@
# cmake -DINPUT=<file> -DOUTPUT=<file> -DARRAY_NAME=<name> -P bin2header.cmake

file(READ "${INPUT}" hex HEX)
string(LENGTH "${hex}" hex_len)

set(output "// Auto-generated from ${INPUT} — do not edit.\n")
string(APPEND output "static const unsigned char ${ARRAY_NAME}[] = {\n ")
# Convert each byte pair to "0xNN," in one regex pass. A per-byte
# loop is O(n^2) in CMake because every iteration re-expands the
# whole hex string, which made the build appear to hang on the font.
string(REGEX REPLACE "([0-9a-f][0-9a-f])" "0x\\1," bytes "${hex}")

math(EXPR last_byte "${hex_len} / 2 - 1")
set(col 0)
set(i 0)
while(i LESS hex_len)
math(EXPR next "${i} + 2")
string(SUBSTRING "${hex}" ${i} 2 byte)
math(EXPR byte_idx "${i} / 2")
if(byte_idx LESS last_byte)
string(APPEND output "0x${byte}, ")
else()
string(APPEND output "0x${byte}")
endif()
math(EXPR col "${col} + 1")
if(col EQUAL 12)
string(APPEND output "\n ")
set(col 0)
endif()
set(i ${next})
endwhile()
# Wrap every 12 bytes. CMake's regex has no {n} quantifier, so the
# 12-byte pattern is built with string(REPEAT). The trailing comma
# after the last byte is valid C, so no special case is needed.
string(REPEAT "0x[0-9a-f][0-9a-f]," 12 row)
string(REGEX REPLACE "(${row})" "\\1\n " bytes "${bytes}")

string(APPEND output "\n};\n")

file(WRITE "${OUTPUT}" "${output}")
file(WRITE "${OUTPUT}"
"// Auto-generated from ${INPUT} — do not edit.\n"
"static const unsigned char ${ARRAY_NAME}[] = {\n ${bytes}\n};\n")