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import sys
import re
import argparse
def main():
parser = argparse.ArgumentParser(
description="A script to generate Go bindings for the CRIU magic values provided by magic.h"
)
parser.add_argument("src", help="Input path (magic.h)", type=str)
parser.add_argument("dest", help="Output path (magic.go)", type=str)
args = parser.parse_args()
try:
with open(args.src, "r") as src:
magics = read_magics(src)
except IOError:
sys.exit("Failed to open magic.h")
try:
with open(args.dest, "w") as dest:
write_magics(dest, magics)
except IOError:
sys.exit("Failed to open magic.py")
def read_magics(src):
magics = {}
# The magic.h header file contains lines like below:
# #define MAGIC_NAME MAGIC_VALUE
# where the magic value can be a hexadecimal or regular
# integer value. The regex below matches lines in the
# header and extracts the name and value as regex groups.
pattern = re.compile(r"#define\s+(\S+)\s+(0x[0-9A-Fa-f]+|\d+)")
for line in src:
match = pattern.match(line)
if match:
name = match.group(1)
value_str = match.group(2)
# If the magic is defined as another magic, skip it
if value_str in magics:
continue
try:
value = int(value_str, 16)
magics[name] = value
except ValueError:
print(f"Failed to parse magic {name}")
continue
return magics
def write_magics(dest, magics):
dest.write(
"""// Code generated by magicgen. DO NOT EDIT.
package magic
type MagicMap struct {
\tByName map[string]uint64
\tByValue map[uint64]string
}
func LoadMagic() MagicMap {
\tmagicMap := MagicMap{
\t\tByName: make(map[string]uint64),
\t\tByValue: make(map[uint64]string),
\t}"""
)
for name in sorted(magics.keys()):
value = magics[name]
# Ignore RAW_IMAGE_MAGIC and V1 magic
if value == 0 or value == 1:
continue
name = name.replace("_MAGIC", "")
dest.write(f'\n\tmagicMap.ByName["{name}"] = {value}')
dest.write(f'\n\tmagicMap.ByValue[{value}] = "{name}"')
dest.write("\n\treturn magicMap\n}\n")
if __name__ == "__main__":
main()
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