mirror of
https://github.com/fluencelabs/assemblyscript
synced 2025-04-26 15:32:16 +00:00
32 lines
921 B
TypeScript
32 lines
921 B
TypeScript
export function bswap<T>(value: T): T {
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assert(sizeof<T>() == 1 || sizeof<T>() == 2 || sizeof<T>() == 4 || sizeof<T>() == 8);
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if (sizeof<T>() == 2) {
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return bswap16<T>(value);
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} else if (sizeof<T>() == 4) {
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return <T>(
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rotl<u32>(<u32>value & 0xFF00FF00, 8) |
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rotr<u32>(<u32>value & 0x00FF00FF, 8)
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);
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} else if (sizeof<T>() == 8) {
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var a: u64 = (<u64>value >> 8) & 0x00FF00FF00FF00FF;
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var b: u64 = (<u64>value & 0x00FF00FF00FF00FF) << 8;
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var v: u64 = a | b;
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a = (v >> 16) & 0x0000FFFF0000FFFF;
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b = (v & 0x0000FFFF0000FFFF) << 16;
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return <T>rotr<u64>(a | b, 32);
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}
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return value;
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}
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export function bswap16<T>(value: T): T {
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assert(sizeof<T>() == 1 || sizeof<T>() == 2 || sizeof<T>() == 4);
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if (sizeof<T>() == 2 || sizeof<T>() == 4) {
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return <T>(((value << 8) & <T>0xFF00) | ((value >> 8) & <T>0x00FF) | (value & <T>0xFFFF0000));
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}
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return value;
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}
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