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| 1 # Copyright 2013 The Chromium Authors. All rights reserved. | 1 # Copyright 2013 The Chromium Authors. All rights reserved. |
| 2 # Use of this source code is governed by a BSD-style license that can be | 2 # Use of this source code is governed by a BSD-style license that can be |
| 3 # found in the LICENSE file. | 3 # found in the LICENSE file. |
| 4 | 4 |
| 5 import module as mojom | 5 import module as mojom |
| 6 | 6 |
| 7 # This module provides a mechanism for determining the packed order and offsets | 7 # This module provides a mechanism for determining the packed order and offsets |
| 8 # of a mojom.Struct. | 8 # of a mojom.Struct. |
| 9 # | 9 # |
| 10 # ps = pack.PackedStruct(struct) | 10 # ps = pack.PackedStruct(struct) |
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| 241 # The fields are iterated in ordinal order here. However, the size of a | 241 # The fields are iterated in ordinal order here. However, the size of a |
| 242 # version is determined by the last field of that version in pack order, | 242 # version is determined by the last field of that version in pack order, |
| 243 # instead of ordinal order. Therefore, we need to calculate the max value. | 243 # instead of ordinal order. Therefore, we need to calculate the max value. |
| 244 last_payload_size = max(GetPayloadSizeUpToField(packed_field), | 244 last_payload_size = max(GetPayloadSizeUpToField(packed_field), |
| 245 last_payload_size) | 245 last_payload_size) |
| 246 | 246 |
| 247 assert len(versions) == 0 or last_num_fields != versions[-1].num_fields | 247 assert len(versions) == 0 or last_num_fields != versions[-1].num_fields |
| 248 versions.append(VersionInfo(last_version, last_num_fields, | 248 versions.append(VersionInfo(last_version, last_num_fields, |
| 249 last_payload_size + HEADER_SIZE)) | 249 last_payload_size + HEADER_SIZE)) |
| 250 return versions | 250 return versions |
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