Vehicle Researcher
6adb63b915
date: 2026-06-04T09:49:56 master commit: c0ab3550eca2e9daf197c46b7e4b24aa9637cf2e
56 lines
1.9 KiB
Python
Executable File
56 lines
1.9 KiB
Python
Executable File
#!/usr/bin/env python3
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import sys
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import math
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import os
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from pathlib import Path
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CHUNK_SIZE = 45 * 1024 * 1024 # 45MB, under GitHub's 50MB limit
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def get_chunk_name(name, idx, num_chunks):
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return f"{name}.chunk{idx+1:02d}of{num_chunks:02d}"
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def get_manifest_path(name):
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return f"{name}.chunkmanifest"
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def _chunk_paths(path, num_chunks):
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return [get_manifest_path(path)] + [get_chunk_name(path, i, num_chunks) for i in range(num_chunks)]
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def get_chunk_targets(path, file_size):
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num_chunks = math.ceil(file_size / CHUNK_SIZE)
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return _chunk_paths(path, num_chunks)
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def chunk_file(path, targets):
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manifest_path, *chunk_paths = targets
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with open(path, 'rb') as f:
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data = f.read()
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actual_num_chunks = max(1, math.ceil(len(data) / CHUNK_SIZE))
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assert len(chunk_paths) >= actual_num_chunks, f"Allowed {len(chunk_paths)} chunks but needs at least {actual_num_chunks}, for path {path}"
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for i, chunk_path in enumerate(chunk_paths):
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with open(chunk_path, 'wb') as f:
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f.write(data[i * CHUNK_SIZE:(i + 1) * CHUNK_SIZE])
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Path(manifest_path).write_text(str(len(chunk_paths)))
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os.remove(path)
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def get_existing_chunks(path):
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if os.path.isfile(path):
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return [path]
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if os.path.isfile(manifest := get_manifest_path(path)):
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num_chunks = int(Path(manifest).read_text().strip())
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return _chunk_paths(path, num_chunks)
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raise FileNotFoundError(path)
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def read_file_chunked(path):
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manifest_path = get_manifest_path(path)
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if os.path.isfile(manifest_path):
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num_chunks = int(Path(manifest_path).read_text().strip())
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return b''.join(Path(get_chunk_name(path, i, num_chunks)).read_bytes() for i in range(num_chunks))
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if os.path.isfile(path):
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return Path(path).read_bytes()
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raise FileNotFoundError(path)
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if __name__ == "__main__":
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path = sys.argv[1]
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chunk_paths = get_chunk_targets(path, os.path.getsize(path))
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chunk_file(path, chunk_paths)
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