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"""Generate a binary image of SerializedStringArray."""
import struct
def SerializeToFile(strings, filename):
"""Builds a binary image of strings.
For file format, see base/serialized_string_array.h.
Args:
strings: A list of strings to be serialized.
filename: Output binary file.
"""
array_size = len(strings)
# Precompute offsets and lengths.
offsets = []
lengths = []
offset = 4 + 8 * array_size # The start offset of strings chunk
for s in strings:
offsets.append(offset)
lengths.append(len(s))
offset += len(s) + 1 # Include one byte for the trailing '\0'
with open(filename, 'wb') as f:
# 4-byte array_size.
f.write(struct.pack('<I', array_size))
# Offset and length array of (4 + 4) * array_size bytes.
for i in xrange(array_size):
f.write(struct.pack('<I', offsets[i]))
f.write(struct.pack('<I', lengths[i]))
# Strings chunk.
for i in xrange(array_size):
f.write(strings[i])
f.write('\0')