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#!/usr/bin/env python3
import argparse
import sys
import os.path
import subprocess
import xml.etree.ElementTree as xml
def train(files, output, zstd='zstd', maxdict=512):
cmd = [ zstd, '--train', '--stdout', '--maxdict=' + str(maxdict), '-o', output ]
for f in files:
cmd.append(f.name)
subprocess.run(cmd)
def compress(file, zstd='zstd', level=19, dictionary=None):
cmd = [ zstd, '--compress', '--stdout', '-' + str(level) ]
if dictionary is not None:
cmd.append('-D')
cmd.append(dictionary.name)
cmd.append(file.name)
return subprocess.run(cmd, capture_output=True).stdout
def hexdump(array_name, input_file, out_h):
array_len = 0
print("constexpr unsigned char {}[] = {{".format(array_name), file=out_h)
for byte in input_file[0:len(input_file)]:
array_len+=1
if array_len%16 == 0:
print(" 0x{:02X},".format(byte), file=out_h)
else:
print(" 0x{:02X},".format(byte), file=out_h, end='')
print("};", file=out_h)
print("constexpr size_t {}_len = {};\n".format(array_name, array_len), file=out_h)
def name(path):
name = path.replace('/', '_')
if name.endswith('.zstd'):
name = name[:-5]
name = name.replace('-', '_')
name = name.replace('.', '_')
return name
if __name__ == "__main__":
parser = argparse.ArgumentParser(
description='Resource Compiler for C++',
epilog='If using compression, make sure the required dependencies are provided.',
formatter_class=argparse.ArgumentDefaultsHelpFormatter
)
parser.add_argument('input', type=argparse.FileType('rt'), help='input file (.xrc)')
parser.add_argument('-o', '--output', type=argparse.FileType('wt'), metavar='OUT', default=sys.stdout, help='output header file')
parser.add_argument('--compress', choices=[ 'None', 'Zstd' ], help='compress input files using algorightm')
parser.add_argument('--dict', type=argparse.FileType('rb'), help='[zstd] use specified dictionary, recommended for many similar small files')
parser.add_argument('--train', action='store_true', help='[zstd] train dictionary')
args=parser.parse_args()
entries_list = ""
if args.compress=='Zstd' and args.train:
train(args.input, args.dict.name)
# write header
print("// Autogenerated binary file hexdump", file=args.output)
print("// This file may get overwritten by the build system\n", file=args.output)
print("#include <embed.h>\n", file=args.output)
# write file data
for child in xml.parse(args.input).getroot():
if child.tag == 'qresource':
prefix = child.attrib['prefix']
for i in child:
vname = name(i.text)
with open(i.text) as f:
hexdump(vname, compress(f, dictionary=args.dict), args.output)
entries_list += " {{ \"{}/{}\", std::span({}, {}_len) }},\n".format(prefix, i.attrib['alias'], vname, vname)
# write dictionary
if args.dict is not None:
hexdump('dictionary', args.dict.read(), args.output)
# write entries
print("constexpr auto entries = frozen::make_unordered_map<frozen::string, std::span<const unsigned char>>({", file=args.output)
print(entries_list, file=args.output)
print("});\n", file=args.output)
# write metadata struct
print("constexpr embed::ResourceData metadata = {", file=args.output)
print(" .compression = embed::{},".format(args.compress), file=args.output)
if args.dict is not None:
print(" .dictionary = std::span(dictionary, dictionary_len),", file=args.output)
print("};", file=args.output)
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