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# Copyright 2017 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import struct
from struct import unpack
def unpack_drawing(file_handle):
key_id, = unpack('Q', file_handle.read(8))
countrycode, = unpack('2s', file_handle.read(2))
recognized, = unpack('b', file_handle.read(1))
timestamp, = unpack('I', file_handle.read(4))
n_strokes, = unpack('H', file_handle.read(2))
image = []
for i in range(n_strokes):
n_points, = unpack('H', file_handle.read(2))
fmt = str(n_points) + 'B'
x = unpack(fmt, file_handle.read(n_points))
y = unpack(fmt, file_handle.read(n_points))
image.append((x, y))
return {
'key_id': key_id,
'countrycode': countrycode,
'recognized': recognized,
'timestamp': timestamp,
'image': image
}
def unpack_drawings(filename):
with open(filename, 'rb') as f:
while True:
try:
yield unpack_drawing(f)
except struct.error:
break
for drawing in unpack_drawings('nose.bin'):
# do something with the drawing
print(drawing['countrycode'])
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