374 lines
12 KiB
C++
374 lines
12 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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// ----------------------------------------------------------------------------
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// Copyright 2011-2020 Arm Limited
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy
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// of the License at:
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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// ----------------------------------------------------------------------------
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/**
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* @brief Functions for encoding/decoding Bounded Integer Sequence Encoding.
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*/
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#include "astc_codec_internals.h"
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// unpacked quint triplets <low,middle,high> for each packed-quint value
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static const uint8_t quints_of_integer[128][3] = {
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{0, 0, 0}, {1, 0, 0}, {2, 0, 0}, {3, 0, 0},
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{4, 0, 0}, {0, 4, 0}, {4, 4, 0}, {4, 4, 4},
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{0, 1, 0}, {1, 1, 0}, {2, 1, 0}, {3, 1, 0},
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{4, 1, 0}, {1, 4, 0}, {4, 4, 1}, {4, 4, 4},
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{0, 2, 0}, {1, 2, 0}, {2, 2, 0}, {3, 2, 0},
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{4, 2, 0}, {2, 4, 0}, {4, 4, 2}, {4, 4, 4},
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{0, 3, 0}, {1, 3, 0}, {2, 3, 0}, {3, 3, 0},
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{4, 3, 0}, {3, 4, 0}, {4, 4, 3}, {4, 4, 4},
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{0, 0, 1}, {1, 0, 1}, {2, 0, 1}, {3, 0, 1},
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{4, 0, 1}, {0, 4, 1}, {4, 0, 4}, {0, 4, 4},
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{0, 1, 1}, {1, 1, 1}, {2, 1, 1}, {3, 1, 1},
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{4, 1, 1}, {1, 4, 1}, {4, 1, 4}, {1, 4, 4},
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{0, 2, 1}, {1, 2, 1}, {2, 2, 1}, {3, 2, 1},
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{4, 2, 1}, {2, 4, 1}, {4, 2, 4}, {2, 4, 4},
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{0, 3, 1}, {1, 3, 1}, {2, 3, 1}, {3, 3, 1},
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{4, 3, 1}, {3, 4, 1}, {4, 3, 4}, {3, 4, 4},
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{0, 0, 2}, {1, 0, 2}, {2, 0, 2}, {3, 0, 2},
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{4, 0, 2}, {0, 4, 2}, {2, 0, 4}, {3, 0, 4},
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{0, 1, 2}, {1, 1, 2}, {2, 1, 2}, {3, 1, 2},
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{4, 1, 2}, {1, 4, 2}, {2, 1, 4}, {3, 1, 4},
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{0, 2, 2}, {1, 2, 2}, {2, 2, 2}, {3, 2, 2},
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{4, 2, 2}, {2, 4, 2}, {2, 2, 4}, {3, 2, 4},
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{0, 3, 2}, {1, 3, 2}, {2, 3, 2}, {3, 3, 2},
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{4, 3, 2}, {3, 4, 2}, {2, 3, 4}, {3, 3, 4},
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{0, 0, 3}, {1, 0, 3}, {2, 0, 3}, {3, 0, 3},
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{4, 0, 3}, {0, 4, 3}, {0, 0, 4}, {1, 0, 4},
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{0, 1, 3}, {1, 1, 3}, {2, 1, 3}, {3, 1, 3},
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{4, 1, 3}, {1, 4, 3}, {0, 1, 4}, {1, 1, 4},
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{0, 2, 3}, {1, 2, 3}, {2, 2, 3}, {3, 2, 3},
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{4, 2, 3}, {2, 4, 3}, {0, 2, 4}, {1, 2, 4},
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{0, 3, 3}, {1, 3, 3}, {2, 3, 3}, {3, 3, 3},
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{4, 3, 3}, {3, 4, 3}, {0, 3, 4}, {1, 3, 4}
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};
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// unpacked trit quintuplets <low,_,_,_,high> for each packed-quint value
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static const uint8_t trits_of_integer[256][5] = {
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{0, 0, 0, 0, 0}, {1, 0, 0, 0, 0}, {2, 0, 0, 0, 0}, {0, 0, 2, 0, 0},
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{0, 1, 0, 0, 0}, {1, 1, 0, 0, 0}, {2, 1, 0, 0, 0}, {1, 0, 2, 0, 0},
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{0, 2, 0, 0, 0}, {1, 2, 0, 0, 0}, {2, 2, 0, 0, 0}, {2, 0, 2, 0, 0},
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{0, 2, 2, 0, 0}, {1, 2, 2, 0, 0}, {2, 2, 2, 0, 0}, {2, 0, 2, 0, 0},
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{0, 0, 1, 0, 0}, {1, 0, 1, 0, 0}, {2, 0, 1, 0, 0}, {0, 1, 2, 0, 0},
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{0, 1, 1, 0, 0}, {1, 1, 1, 0, 0}, {2, 1, 1, 0, 0}, {1, 1, 2, 0, 0},
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{0, 2, 1, 0, 0}, {1, 2, 1, 0, 0}, {2, 2, 1, 0, 0}, {2, 1, 2, 0, 0},
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{0, 0, 0, 2, 2}, {1, 0, 0, 2, 2}, {2, 0, 0, 2, 2}, {0, 0, 2, 2, 2},
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{0, 0, 0, 1, 0}, {1, 0, 0, 1, 0}, {2, 0, 0, 1, 0}, {0, 0, 2, 1, 0},
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{0, 1, 0, 1, 0}, {1, 1, 0, 1, 0}, {2, 1, 0, 1, 0}, {1, 0, 2, 1, 0},
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{0, 2, 0, 1, 0}, {1, 2, 0, 1, 0}, {2, 2, 0, 1, 0}, {2, 0, 2, 1, 0},
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{0, 2, 2, 1, 0}, {1, 2, 2, 1, 0}, {2, 2, 2, 1, 0}, {2, 0, 2, 1, 0},
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{0, 0, 1, 1, 0}, {1, 0, 1, 1, 0}, {2, 0, 1, 1, 0}, {0, 1, 2, 1, 0},
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{0, 1, 1, 1, 0}, {1, 1, 1, 1, 0}, {2, 1, 1, 1, 0}, {1, 1, 2, 1, 0},
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{0, 2, 1, 1, 0}, {1, 2, 1, 1, 0}, {2, 2, 1, 1, 0}, {2, 1, 2, 1, 0},
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{0, 1, 0, 2, 2}, {1, 1, 0, 2, 2}, {2, 1, 0, 2, 2}, {1, 0, 2, 2, 2},
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{0, 0, 0, 2, 0}, {1, 0, 0, 2, 0}, {2, 0, 0, 2, 0}, {0, 0, 2, 2, 0},
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{0, 1, 0, 2, 0}, {1, 1, 0, 2, 0}, {2, 1, 0, 2, 0}, {1, 0, 2, 2, 0},
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{0, 2, 0, 2, 0}, {1, 2, 0, 2, 0}, {2, 2, 0, 2, 0}, {2, 0, 2, 2, 0},
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{0, 2, 2, 2, 0}, {1, 2, 2, 2, 0}, {2, 2, 2, 2, 0}, {2, 0, 2, 2, 0},
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{0, 0, 1, 2, 0}, {1, 0, 1, 2, 0}, {2, 0, 1, 2, 0}, {0, 1, 2, 2, 0},
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{0, 1, 1, 2, 0}, {1, 1, 1, 2, 0}, {2, 1, 1, 2, 0}, {1, 1, 2, 2, 0},
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{0, 2, 1, 2, 0}, {1, 2, 1, 2, 0}, {2, 2, 1, 2, 0}, {2, 1, 2, 2, 0},
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{0, 2, 0, 2, 2}, {1, 2, 0, 2, 2}, {2, 2, 0, 2, 2}, {2, 0, 2, 2, 2},
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{0, 0, 0, 0, 2}, {1, 0, 0, 0, 2}, {2, 0, 0, 0, 2}, {0, 0, 2, 0, 2},
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{0, 1, 0, 0, 2}, {1, 1, 0, 0, 2}, {2, 1, 0, 0, 2}, {1, 0, 2, 0, 2},
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{0, 2, 0, 0, 2}, {1, 2, 0, 0, 2}, {2, 2, 0, 0, 2}, {2, 0, 2, 0, 2},
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{0, 2, 2, 0, 2}, {1, 2, 2, 0, 2}, {2, 2, 2, 0, 2}, {2, 0, 2, 0, 2},
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{0, 0, 1, 0, 2}, {1, 0, 1, 0, 2}, {2, 0, 1, 0, 2}, {0, 1, 2, 0, 2},
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{0, 1, 1, 0, 2}, {1, 1, 1, 0, 2}, {2, 1, 1, 0, 2}, {1, 1, 2, 0, 2},
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{0, 2, 1, 0, 2}, {1, 2, 1, 0, 2}, {2, 2, 1, 0, 2}, {2, 1, 2, 0, 2},
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{0, 2, 2, 2, 2}, {1, 2, 2, 2, 2}, {2, 2, 2, 2, 2}, {2, 0, 2, 2, 2},
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{0, 0, 0, 0, 1}, {1, 0, 0, 0, 1}, {2, 0, 0, 0, 1}, {0, 0, 2, 0, 1},
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{0, 1, 0, 0, 1}, {1, 1, 0, 0, 1}, {2, 1, 0, 0, 1}, {1, 0, 2, 0, 1},
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{0, 2, 0, 0, 1}, {1, 2, 0, 0, 1}, {2, 2, 0, 0, 1}, {2, 0, 2, 0, 1},
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{0, 2, 2, 0, 1}, {1, 2, 2, 0, 1}, {2, 2, 2, 0, 1}, {2, 0, 2, 0, 1},
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{0, 0, 1, 0, 1}, {1, 0, 1, 0, 1}, {2, 0, 1, 0, 1}, {0, 1, 2, 0, 1},
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{0, 1, 1, 0, 1}, {1, 1, 1, 0, 1}, {2, 1, 1, 0, 1}, {1, 1, 2, 0, 1},
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{0, 2, 1, 0, 1}, {1, 2, 1, 0, 1}, {2, 2, 1, 0, 1}, {2, 1, 2, 0, 1},
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{0, 0, 1, 2, 2}, {1, 0, 1, 2, 2}, {2, 0, 1, 2, 2}, {0, 1, 2, 2, 2},
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{0, 0, 0, 1, 1}, {1, 0, 0, 1, 1}, {2, 0, 0, 1, 1}, {0, 0, 2, 1, 1},
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{0, 1, 0, 1, 1}, {1, 1, 0, 1, 1}, {2, 1, 0, 1, 1}, {1, 0, 2, 1, 1},
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{0, 2, 0, 1, 1}, {1, 2, 0, 1, 1}, {2, 2, 0, 1, 1}, {2, 0, 2, 1, 1},
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{0, 2, 2, 1, 1}, {1, 2, 2, 1, 1}, {2, 2, 2, 1, 1}, {2, 0, 2, 1, 1},
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{0, 0, 1, 1, 1}, {1, 0, 1, 1, 1}, {2, 0, 1, 1, 1}, {0, 1, 2, 1, 1},
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{0, 1, 1, 1, 1}, {1, 1, 1, 1, 1}, {2, 1, 1, 1, 1}, {1, 1, 2, 1, 1},
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{0, 2, 1, 1, 1}, {1, 2, 1, 1, 1}, {2, 2, 1, 1, 1}, {2, 1, 2, 1, 1},
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{0, 1, 1, 2, 2}, {1, 1, 1, 2, 2}, {2, 1, 1, 2, 2}, {1, 1, 2, 2, 2},
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{0, 0, 0, 2, 1}, {1, 0, 0, 2, 1}, {2, 0, 0, 2, 1}, {0, 0, 2, 2, 1},
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{0, 1, 0, 2, 1}, {1, 1, 0, 2, 1}, {2, 1, 0, 2, 1}, {1, 0, 2, 2, 1},
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{0, 2, 0, 2, 1}, {1, 2, 0, 2, 1}, {2, 2, 0, 2, 1}, {2, 0, 2, 2, 1},
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{0, 2, 2, 2, 1}, {1, 2, 2, 2, 1}, {2, 2, 2, 2, 1}, {2, 0, 2, 2, 1},
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{0, 0, 1, 2, 1}, {1, 0, 1, 2, 1}, {2, 0, 1, 2, 1}, {0, 1, 2, 2, 1},
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{0, 1, 1, 2, 1}, {1, 1, 1, 2, 1}, {2, 1, 1, 2, 1}, {1, 1, 2, 2, 1},
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{0, 2, 1, 2, 1}, {1, 2, 1, 2, 1}, {2, 2, 1, 2, 1}, {2, 1, 2, 2, 1},
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{0, 2, 1, 2, 2}, {1, 2, 1, 2, 2}, {2, 2, 1, 2, 2}, {2, 1, 2, 2, 2},
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{0, 0, 0, 1, 2}, {1, 0, 0, 1, 2}, {2, 0, 0, 1, 2}, {0, 0, 2, 1, 2},
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{0, 1, 0, 1, 2}, {1, 1, 0, 1, 2}, {2, 1, 0, 1, 2}, {1, 0, 2, 1, 2},
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{0, 2, 0, 1, 2}, {1, 2, 0, 1, 2}, {2, 2, 0, 1, 2}, {2, 0, 2, 1, 2},
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{0, 2, 2, 1, 2}, {1, 2, 2, 1, 2}, {2, 2, 2, 1, 2}, {2, 0, 2, 1, 2},
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{0, 0, 1, 1, 2}, {1, 0, 1, 1, 2}, {2, 0, 1, 1, 2}, {0, 1, 2, 1, 2},
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{0, 1, 1, 1, 2}, {1, 1, 1, 1, 2}, {2, 1, 1, 1, 2}, {1, 1, 2, 1, 2},
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{0, 2, 1, 1, 2}, {1, 2, 1, 1, 2}, {2, 2, 1, 1, 2}, {2, 1, 2, 1, 2},
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{0, 2, 2, 2, 2}, {1, 2, 2, 2, 2}, {2, 2, 2, 2, 2}, {2, 1, 2, 2, 2}
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};
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void find_number_of_bits_trits_quints(
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int quantization_level,
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int* bits,
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int* trits,
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int* quints
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) {
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*bits = 0;
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*trits = 0;
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*quints = 0;
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switch (quantization_level)
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{
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case QUANT_2:
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*bits = 1;
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break;
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case QUANT_3:
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*bits = 0;
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*trits = 1;
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break;
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case QUANT_4:
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*bits = 2;
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break;
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case QUANT_5:
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*bits = 0;
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*quints = 1;
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break;
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case QUANT_6:
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*bits = 1;
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*trits = 1;
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break;
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case QUANT_8:
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*bits = 3;
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break;
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case QUANT_10:
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*bits = 1;
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*quints = 1;
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break;
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case QUANT_12:
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*bits = 2;
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*trits = 1;
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break;
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case QUANT_16:
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*bits = 4;
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break;
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case QUANT_20:
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*bits = 2;
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*quints = 1;
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break;
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case QUANT_24:
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*bits = 3;
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*trits = 1;
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break;
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case QUANT_32:
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*bits = 5;
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break;
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case QUANT_40:
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*bits = 3;
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*quints = 1;
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break;
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case QUANT_48:
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*bits = 4;
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*trits = 1;
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break;
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case QUANT_64:
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*bits = 6;
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break;
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case QUANT_80:
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*bits = 4;
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*quints = 1;
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break;
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case QUANT_96:
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*bits = 5;
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*trits = 1;
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break;
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case QUANT_128:
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*bits = 7;
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break;
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case QUANT_160:
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*bits = 5;
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*quints = 1;
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break;
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case QUANT_192:
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*bits = 6;
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*trits = 1;
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break;
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case QUANT_256:
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*bits = 8;
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break;
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}
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}
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// routine to read up to 8 bits
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static inline int read_bits(
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int bitcount,
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int bitoffset,
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const uint8_t* ptr
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) {
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int mask = (1 << bitcount) - 1;
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ptr += bitoffset >> 3;
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bitoffset &= 7;
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int value = ptr[0] | (ptr[1] << 8);
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value >>= bitoffset;
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value &= mask;
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return value;
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}
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void decode_ise(
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int quantization_level,
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int elements,
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const uint8_t* input_data,
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uint8_t* output_data,
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int bit_offset
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) {
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int i;
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// note: due to how the trit/quint-block unpacking is done in this function,
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// we may write more temporary results than the number of outputs
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// The maximum actual number of results is 64 bit, but we keep 4 additional elements
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// of padding.
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uint8_t results[68];
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uint8_t tq_blocks[22]; // trit-blocks or quint-blocks
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int bits, trits, quints;
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find_number_of_bits_trits_quints(quantization_level, &bits, &trits, &quints);
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int lcounter = 0;
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int hcounter = 0;
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// trit-blocks or quint-blocks must be zeroed out before we collect them in the loop below.
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for (i = 0; i < 22; i++)
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tq_blocks[i] = 0;
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// collect bits for each element, as well as bits for any trit-blocks and quint-blocks.
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for (i = 0; i < elements; i++)
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{
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results[i] = read_bits(bits, bit_offset, input_data);
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bit_offset += bits;
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if (trits)
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{
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static const int bits_to_read[5] = { 2, 2, 1, 2, 1 };
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static const int block_shift[5] = { 0, 2, 4, 5, 7 };
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static const int next_lcounter[5] = { 1, 2, 3, 4, 0 };
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static const int hcounter_incr[5] = { 0, 0, 0, 0, 1 };
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int tdata = read_bits(bits_to_read[lcounter], bit_offset, input_data);
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bit_offset += bits_to_read[lcounter];
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tq_blocks[hcounter] |= tdata << block_shift[lcounter];
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hcounter += hcounter_incr[lcounter];
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lcounter = next_lcounter[lcounter];
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}
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if (quints)
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{
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static const int bits_to_read[3] = { 3, 2, 2 };
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static const int block_shift[3] = { 0, 3, 5 };
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static const int next_lcounter[3] = { 1, 2, 0 };
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static const int hcounter_incr[3] = { 0, 0, 1 };
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int tdata = read_bits(bits_to_read[lcounter], bit_offset, input_data);
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bit_offset += bits_to_read[lcounter];
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tq_blocks[hcounter] |= tdata << block_shift[lcounter];
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hcounter += hcounter_incr[lcounter];
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lcounter = next_lcounter[lcounter];
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}
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}
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// unpack trit-blocks or quint-blocks as needed
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if (trits)
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{
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int trit_blocks = (elements + 4) / 5;
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for (i = 0; i < trit_blocks; i++)
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{
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const uint8_t *tritptr = trits_of_integer[tq_blocks[i]];
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results[5 * i] |= tritptr[0] << bits;
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results[5 * i + 1] |= tritptr[1] << bits;
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results[5 * i + 2] |= tritptr[2] << bits;
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results[5 * i + 3] |= tritptr[3] << bits;
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results[5 * i + 4] |= tritptr[4] << bits;
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}
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}
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if (quints)
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{
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int quint_blocks = (elements + 2) / 3;
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for (i = 0; i < quint_blocks; i++)
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{
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const uint8_t *quintptr = quints_of_integer[tq_blocks[i]];
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results[3 * i] |= quintptr[0] << bits;
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results[3 * i + 1] |= quintptr[1] << bits;
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results[3 * i + 2] |= quintptr[2] << bits;
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}
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}
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for (i = 0; i < elements; i++)
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output_data[i] = results[i];
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}
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int compute_ise_bitcount(
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int items,
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quantization_method quant
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) {
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switch (quant)
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{
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case QUANT_2:
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return items;
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case QUANT_3:
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return (8 * items + 4) / 5;
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case QUANT_4:
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return 2 * items;
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case QUANT_5:
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return (7 * items + 2) / 3;
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case QUANT_6:
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return (13 * items + 4) / 5;
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case QUANT_8:
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|
return 3 * items;
|
|
case QUANT_10:
|
|
return (10 * items + 2) / 3;
|
|
case QUANT_12:
|
|
return (18 * items + 4) / 5;
|
|
case QUANT_16:
|
|
return items * 4;
|
|
case QUANT_20:
|
|
return (13 * items + 2) / 3;
|
|
case QUANT_24:
|
|
return (23 * items + 4) / 5;
|
|
case QUANT_32:
|
|
return 5 * items;
|
|
case QUANT_40:
|
|
return (16 * items + 2) / 3;
|
|
case QUANT_48:
|
|
return (28 * items + 4) / 5;
|
|
case QUANT_64:
|
|
return 6 * items;
|
|
case QUANT_80:
|
|
return (19 * items + 2) / 3;
|
|
case QUANT_96:
|
|
return (33 * items + 4) / 5;
|
|
case QUANT_128:
|
|
return 7 * items;
|
|
case QUANT_160:
|
|
return (22 * items + 2) / 3;
|
|
case QUANT_192:
|
|
return (38 * items + 4) / 5;
|
|
case QUANT_256:
|
|
return 8 * items;
|
|
default:
|
|
return 100000;
|
|
}
|
|
}
|