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AK: Generalize ByteReader

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Also use it instead of CPU.h's possibly_unaligned_data interface
This commit is contained in:
Hendiadyoin1 2021-07-13 17:17:12 +02:00 • committed by Ali Mohammad Pur
parent b98e741237
commit d761c5024b
4 changed files with 20 additions and 113 deletions
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59
AK/ByteReader.h
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@ -6,68 +6,29 @@
#pragma once
#include <AK/StdLibExtraDetails.h>
#include <AK/Types.h>
namespace AK {
struct ByteReader {
static void store(u8* address, u16 value)
template<typename T>
requires(IsTriviallyCopyable<T>) static void store(u8* addr, T value)
{
union {
u16 _16;
u8 _8[2];
} const v { ._16 = value };
__builtin_memcpy(address, v._8, 2);
__builtin_memcpy(addr, &value, sizeof(T));
}
static void store(u8* address, u32 value)
template<typename T>
requires(IsTriviallyConstructible<T>) static void load(const u8* addr, T& value)
{
union {
u32 _32;
u8 _8[4];
} const v { ._32 = value };
__builtin_memcpy(address, v._8, 4);
}
static void load(const u8* address, u16& value)
{
union {
u16 _16;
u8 _8[2];
} v { ._16 = 0 };
__builtin_memcpy(&v._8, address, 2);
value = v._16;
}
static void load(const u8* address, u32& value)
{
union {
u32 _32;
u8 _8[4];
} v { ._32 = 0 };
__builtin_memcpy(&v._8, address, 4);
value = v._32;
}
static void load(const u8* address, u64& value)
{
union {
u64 _64;
u8 _8[8];
} v { ._64 = 0 };
__builtin_memcpy(&v._8, address, 8);
value = v._64;
__builtin_memcpy(&value, addr, sizeof(T));
}
template<typename T>
static T* load_pointer(const u8* address)
{
if constexpr (sizeof(T*) == 4) {
return reinterpret_cast<T*>(load32(address));
} else {
static_assert(sizeof(T*) == 8, "sizeof(T*) must be either 4 or 8");
return reinterpret_cast<T*>(load64(address));
}
FlatPtr value;
load<FlatPtr>(address, value);
return reinterpret_cast<T*>(value);
}
static u16 load16(const u8* address)