mirror of
https://github.com/a2-4am/4cade.git
synced 2024-11-25 09:30:57 +00:00
95 lines
4.0 KiB
Python
Executable File
95 lines
4.0 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
|
|
# flags
|
|
# -p pad sizes within data file to next block size (default off)
|
|
|
|
# parameters
|
|
# stdin - input containing list of files (e.g. FX.CONF)
|
|
# stdout - binary OKVS data structure
|
|
# 1 - output filename for data file
|
|
# 2 - input directory of files to merge into data file
|
|
# 3 - (optional) output filename for log of key,offset,size
|
|
|
|
import argparse
|
|
import os
|
|
import os.path
|
|
from struct import pack
|
|
import sys
|
|
|
|
kStandardFilename = 'STANDARD'
|
|
|
|
def build(records, args):
|
|
output_file_size = os.path.getsize(args.output_file)
|
|
standard_offset = standard_size = 0
|
|
standard_filename = os.path.join(args.input_directory, kStandardFilename)
|
|
with open(args.output_file, 'ab') as output_file_handle:
|
|
if os.path.exists(standard_filename):
|
|
standard_offset = output_file_size
|
|
standard_size = os.path.getsize(standard_filename)
|
|
with open(standard_filename, 'rb') as standard_handle:
|
|
output_file_handle.write(standard_handle.read())
|
|
output_file_size += standard_size
|
|
|
|
# yield OKVS header (2 x 2 bytes, unsigned int, little-endian)
|
|
yield pack('<2H', len(records), 0)
|
|
|
|
for rec in records:
|
|
filename, dummy, dummy = rec.partition('=')
|
|
key, dummy, addr = filename.partition('#')
|
|
key_length = len(key)
|
|
filename = os.path.join(args.input_directory, filename)
|
|
rec_offset = standard_offset
|
|
rec_size = standard_size
|
|
|
|
# yield record length (1 byte, unsigned byte)
|
|
if addr:
|
|
# if filename is in the form 'NAME#06ADDR' then create extended index record
|
|
yield pack('B', key_length+9)
|
|
# trim '06' so we get just the starting address
|
|
addr = addr[2:]
|
|
else:
|
|
yield pack('B', key_length+7)
|
|
|
|
# yield key (Pascal-style string)
|
|
yield pack(f'{key_length+1}p', key.encode('ascii'))
|
|
|
|
if os.path.exists(filename):
|
|
rec_offset = output_file_size
|
|
rec_size = os.path.getsize(filename)
|
|
output_file_size += rec_size
|
|
if args.pad:
|
|
# If offset+size does not cross a block boundary, use file's true size.
|
|
# Otherwise, round up size to the next block boundary.
|
|
# This padding does not get added to the file; it is just an
|
|
# optimization to avoid a partial copy on the last block read.
|
|
if (rec_offset // 512) != ((rec_offset + rec_size) // 512):
|
|
rec_size = ((rec_offset + rec_size + 511) & -512) - rec_offset
|
|
with open(filename, 'rb') as input_file_handle:
|
|
output_file_handle.write(input_file_handle.read())
|
|
|
|
# yield record offset (3 bytes, big-endian, unsigned long)
|
|
yield pack('>L', rec_offset)[1:]
|
|
|
|
# yield record size (2 bytes, little-endian, unsigned short)
|
|
yield pack('<H', rec_size)
|
|
|
|
if addr:
|
|
# for extended index record, yield load address (2 bytes, little-endian, unsigned short)
|
|
yield bytes.fromhex(addr)[::-1]
|
|
|
|
if args.log_file:
|
|
with open(args.log_file, 'a') as log_file_handle:
|
|
log_file_handle.write(f'{key},{rec_offset},{rec_size}\n')
|
|
|
|
if __name__ == "__main__":
|
|
parser = argparse.ArgumentParser(description="Build indexed OKVS structure with links to data stored in TOTAL.DATA file")
|
|
parser.add_argument("output_file")
|
|
parser.add_argument("input_directory")
|
|
parser.add_argument("log_file", nargs='?', default=None)
|
|
parser.add_argument("-p", "--pad", action="store_true", default=False, help="pad file sizes to multiples of 512 (default: use exact size)")
|
|
args = parser.parse_args()
|
|
records = [x.strip() for x in sys.stdin.readlines()]
|
|
records = [x for x in records if x and x[0] not in ('#', '[')]
|
|
for b in build(records, args):
|
|
sys.stdout.buffer.write(b)
|