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import os
def split_file(input_file, output_dir, chunk_size):
if not os.path.exists(output_dir):
os.makedirs(output_dir)
file_size = os.path.getsize(input_file)
base_name = os.path.basename(input_file)
num_chunks = (file_size + chunk_size - 1) // chunk_size
print(f"Total size: {file_size} bytes, split to {num_chunks} files")
with open(input_file, 'rb') as f:
for i in range(num_chunks):
part_filename = os.path.join(output_dir, f"{base_name}.part{i + 1:03d}")
with open(part_filename, 'wb') as part_file:
bytes_written = 0
while bytes_written < chunk_size:
buffer = f.read(min(1024 * 1024, chunk_size - bytes_written))
if not buffer:
break
part_file.write(buffer)
bytes_written += len(buffer)
print(f"Write to: {part_filename} Size: {bytes_written} bytes")
if __name__ == '__main__':
input_file = "data/BIOSCAN_1M/split_data/BioScan_data_in_splits.hdf5"
output_dir = "data/BIOSCAN_1M/split_data/splitted_files"
chunk_size = 45 * (1024 ** 3)
split_file(input_file, output_dir, chunk_size)
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