61 lines
2.0 KiB
Nim
61 lines
2.0 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 unsigned integer
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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 to an array[3, uint8]
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result = cast[array[3, uint8]](uint(input))
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proc toQuad*(input: int | uint | uint16 | uint32): array[4, uint8] =
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## Converts an unsigned integer to an array[4, uint8]
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result = cast[array[4, uint8]](uint(input))
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proc toLong*(input: int | uint | uint16 | uint32 | uint64): array[8, uint8] =
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## Converts an unsigned integer to an array[8, uint8]
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result = cast[array[8, 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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proc fromQuad*(input: array[4, uint8]): uint =
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## Rebuilts the output of toQuad into
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## an uint
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copyMem(result.addr, unsafeAddr(input), sizeof(uint32))
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proc fromLong*(input: array[8, uint8]): uint =
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## Rebuilts the output of toQuad into
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## an uint
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copyMem(result.addr, unsafeAddr(input), sizeof(uint64)) |