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| 1 /* | 1 /* |
| 2 * Copyright 2015 The WebRTC Project Authors. All rights reserved. | 2 * Copyright 2015 The WebRTC Project Authors. All rights reserved. |
| 3 * | 3 * |
| 4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ | 9 */ |
| 10 | 10 |
| 11 #include "webrtc/base/bitbuffer.h" | 11 #include "webrtc/base/bitbuffer.h" |
| 12 | 12 |
| 13 #include <algorithm> | 13 #include <algorithm> |
| 14 #include <limits> | 14 #include <limits> |
| 15 | 15 |
| 16 #include "webrtc/base/checks.h" | 16 #include "webrtc/base/checks.h" |
| 17 | 17 |
| 18 namespace { | 18 namespace { |
| 19 | 19 |
| 20 // Returns the lowest (right-most) |bit_count| bits in |byte|. | 20 // Returns the lowest (right-most) |bit_count| bits in |byte|. |
| 21 uint8_t LowestBits(uint8_t byte, size_t bit_count) { | 21 uint8_t LowestBits(uint8_t byte, size_t bit_count) { |
| 22 RTC_DCHECK_LE(bit_count, 8u); | 22 RTC_DCHECK_LE(bit_count, 8); |
| 23 return byte & ((1 << bit_count) - 1); | 23 return byte & ((1 << bit_count) - 1); |
| 24 } | 24 } |
| 25 | 25 |
| 26 // Returns the highest (left-most) |bit_count| bits in |byte|, shifted to the | 26 // Returns the highest (left-most) |bit_count| bits in |byte|, shifted to the |
| 27 // lowest bits (to the right). | 27 // lowest bits (to the right). |
| 28 uint8_t HighestBits(uint8_t byte, size_t bit_count) { | 28 uint8_t HighestBits(uint8_t byte, size_t bit_count) { |
| 29 RTC_DCHECK_LE(bit_count, 8u); | 29 RTC_DCHECK_LE(bit_count, 8); |
| 30 uint8_t shift = 8 - static_cast<uint8_t>(bit_count); | 30 uint8_t shift = 8 - static_cast<uint8_t>(bit_count); |
| 31 uint8_t mask = 0xFF << shift; | 31 uint8_t mask = 0xFF << shift; |
| 32 return (byte & mask) >> shift; | 32 return (byte & mask) >> shift; |
| 33 } | 33 } |
| 34 | 34 |
| 35 // Returns the highest byte of |val| in a uint8_t. | 35 // Returns the highest byte of |val| in a uint8_t. |
| 36 uint8_t HighestByte(uint64_t val) { | 36 uint8_t HighestByte(uint64_t val) { |
| 37 return static_cast<uint8_t>(val >> 56); | 37 return static_cast<uint8_t>(val >> 56); |
| 38 } | 38 } |
| 39 | 39 |
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| 301 return WriteExponentialGolomb((signed_val * 2) - 1); | 301 return WriteExponentialGolomb((signed_val * 2) - 1); |
| 302 } else { | 302 } else { |
| 303 if (val == std::numeric_limits<int32_t>::min()) | 303 if (val == std::numeric_limits<int32_t>::min()) |
| 304 return false; // Not supported, would cause overflow. | 304 return false; // Not supported, would cause overflow. |
| 305 uint32_t signed_val = -val; | 305 uint32_t signed_val = -val; |
| 306 return WriteExponentialGolomb(signed_val * 2); | 306 return WriteExponentialGolomb(signed_val * 2); |
| 307 } | 307 } |
| 308 } | 308 } |
| 309 | 309 |
| 310 } // namespace rtc | 310 } // namespace rtc |
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