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117 lines
3.6 KiB
117 lines
3.6 KiB
2 years ago
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# • ▌ ▄ ·. ▄▄▄▄· ▄▄▄ .·▄▄▄▄ ▪ ▄▄▄▄▄ ▄▄▄ ▄▄▄·▄▄▄
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# ·██ ▐███▪▐█ ▀█▪ ▀▄.▀·██▪ ██ ██ •██ ▪ ▀▄ █· ▐█ ▄█▀▄ █·▪
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# ▐█ ▌▐▌▐█·▐█▀▀█▄ ▐▀▀▪▄▐█· ▐█▌▐█· ▐█.▪ ▄█▀▄ ▐▀▀▄ ██▀·▐▀▀▄ ▄█▀▄
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# ██ ██▌▐█▌██▄▪▐█ ▐█▄▄▌██. ██ ▐█▌ ▐█▌·▐█▌.▐▌▐█•█▌ ▐█▪·•▐█•█▌▐█▌.▐▌
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# ▀▀ █▪▀▀▀·▀▀▀▀ ▀▀▀ ▀▀▀▀▀• ▀▀▀ ▀▀▀ ▀█▄▀▪.▀ ▀ .▀ .▀ ▀ ▀█▄▀▪
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# Magicbane Emulator Project © 2013 - 2022
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# www.magicbane.com
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2 years ago
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import struct
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import zlib
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def read_dword(cache_file):
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data = cache_file.read(4)
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return struct.unpack('<I', data)[0]
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def read_qword(cache_file):
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dwords = struct.unpack('<II', cache_file.read(8))
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buffer = struct.pack('<II', dwords[1], dwords[0])
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return struct.unpack('<Q', buffer)[0]
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def read_resource_data(cache_file, start, length):
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current_position = cache_file.tell()
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cache_file.seek(start)
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data = cache_file.read(length)
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cache_file.seek(current_position)
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return data
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def load_cache_file(filename):
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cache_file = open(filename, 'rb')
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num_resources = read_dword(cache_file)
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read_dword(cache_file)
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read_dword(cache_file)
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read_dword(cache_file)
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resources = []
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for _ in range(num_resources):
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resource_id = read_qword(cache_file)
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resource_offset = read_dword(cache_file)
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resource_decompressed_len = read_dword(cache_file)
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resource_compressed_len = read_dword(cache_file)
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resource_data = read_resource_data(
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cache_file,
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resource_offset,
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resource_compressed_len
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)
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if resource_decompressed_len > resource_compressed_len:
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resource_data = zlib.decompress(resource_data)
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resources.append([
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resource_id,
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resource_data
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])
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return resources
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def write_dword(cache_file, value):
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data = struct.pack('<I', value)
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cache_file.write(data)
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def write_qword(cache_file, value):
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qword = struct.pack('<Q', value)
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dwords = [
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struct.unpack('<I', qword[:4])[0],
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struct.unpack('<I', qword[4:])[0],
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]
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data = struct.pack('<II', dwords[1], dwords[0])
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cache_file.write(data)
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def write_bytes(cache_file, value):
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cache_file.write(value)
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def save_cache_file(filename, resources, compress=True):
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cache_file = open(filename, 'wb')
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num_resources = len(resources)
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last_offset = 0
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last_offset += 0x10 # header
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last_offset += num_resources * 0x14 # resource_headers
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data_start = last_offset
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for resource in resources:
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resource.append(last_offset)
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resource.append(len(resource[1]))
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if compress:
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resource[1] = zlib.compress(resource[1])
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resource.append(len(resource[1]))
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last_offset += resource[4]
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data_end = last_offset
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write_dword(cache_file, num_resources)
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write_dword(cache_file, data_start)
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write_dword(cache_file, data_end)
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write_dword(cache_file, 0xffffffff)
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for resource in resources:
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write_qword(cache_file, resource[0])
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write_dword(cache_file, resource[2])
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write_dword(cache_file, resource[3])
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write_dword(cache_file, resource[4])
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for resource in resources:
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write_bytes(cache_file, resource[1])
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