41 lines
1.4 KiB
Nim
41 lines
1.4 KiB
Nim
# Copyright 2022 Mattia Giambirtone & All Contributors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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## Utilities to convert from/to our 16-bit and 24-bit representations
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## of numbers
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proc toDouble*(input: int | uint | uint16): array[2, uint8] =
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## Converts an int (either int, uint or uint16)
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## to an array[2, uint8]
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result = cast[array[2, uint8]](uint16(input))
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proc toTriple*(input: uint | int): array[3, uint8] =
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## Converts an unsigned integer (int is converted
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## to an uint and sign is lost!) to an array[3, uint8]
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result = cast[array[3, uint8]](uint(input))
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proc fromDouble*(input: array[2, uint8]): uint16 =
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## Rebuilds the output of toDouble into
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## an uint16
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copyMem(result.addr, unsafeAddr(input), sizeof(uint16))
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proc fromTriple*(input: array[3, uint8]): uint =
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## Rebuilds the output of toTriple into
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## an uint
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copyMem(result.addr, unsafeAddr(input), sizeof(uint8) * 3)
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