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AK: Generalize ByteReader
Also use it instead of CPU.h's possibly_unaligned_data interface
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4 changed files with 20 additions and 113 deletions
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@ -6,68 +6,29 @@
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#pragma once
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#include <AK/StdLibExtraDetails.h>
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#include <AK/Types.h>
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namespace AK {
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struct ByteReader {
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static void store(u8* address, u16 value)
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template<typename T>
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requires(IsTriviallyCopyable<T>) static void store(u8* addr, T value)
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{
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union {
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u16 _16;
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u8 _8[2];
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} const v { ._16 = value };
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__builtin_memcpy(address, v._8, 2);
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__builtin_memcpy(addr, &value, sizeof(T));
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}
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static void store(u8* address, u32 value)
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template<typename T>
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requires(IsTriviallyConstructible<T>) static void load(const u8* addr, T& value)
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{
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union {
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u32 _32;
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u8 _8[4];
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} const v { ._32 = value };
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__builtin_memcpy(address, v._8, 4);
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}
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static void load(const u8* address, u16& value)
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{
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union {
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u16 _16;
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u8 _8[2];
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} v { ._16 = 0 };
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__builtin_memcpy(&v._8, address, 2);
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value = v._16;
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}
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static void load(const u8* address, u32& value)
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{
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union {
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u32 _32;
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u8 _8[4];
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} v { ._32 = 0 };
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__builtin_memcpy(&v._8, address, 4);
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value = v._32;
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}
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static void load(const u8* address, u64& value)
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{
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union {
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u64 _64;
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u8 _8[8];
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} v { ._64 = 0 };
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__builtin_memcpy(&v._8, address, 8);
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value = v._64;
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__builtin_memcpy(&value, addr, sizeof(T));
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}
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template<typename T>
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static T* load_pointer(const u8* address)
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{
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if constexpr (sizeof(T*) == 4) {
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return reinterpret_cast<T*>(load32(address));
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} else {
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static_assert(sizeof(T*) == 8, "sizeof(T*) must be either 4 or 8");
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return reinterpret_cast<T*>(load64(address));
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}
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FlatPtr value;
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load<FlatPtr>(address, value);
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return reinterpret_cast<T*>(value);
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}
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static u16 load16(const u8* address)
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