164 lines
2.2 KiB
C++
164 lines
2.2 KiB
C++
/**
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* =========================================================================
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* File : byte_order.cpp
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* Project : 0 A.D.
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* Description : byte order (endianness) support routines.
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#include "precompiled.h"
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#include "byte_order.h"
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#ifndef swap16
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u16 swap16(const u16 x)
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{
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return (u16)(((x & 0xff) << 8) | (x >> 8));
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}
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u32 swap32(const u32 x)
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{
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return (x << 24) |
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(x >> 24) |
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((x << 8) & 0x00ff0000) |
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((x >> 8) & 0x0000ff00);
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}
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u64 swap64(const u64 x)
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{
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const u32 lo = (u32)(x & 0xFFFFFFFF);
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const u32 hi = (u32)(x >> 32);
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u64 ret = swap32(lo);
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ret <<= 32;
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// careful: must shift var of type u64, not u32
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ret |= swap32(hi);
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return ret;
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}
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#endif // #ifndef swap16
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//-----------------------------------------------------------------------------
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u16 to_le16(u16 x)
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{
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#if BYTE_ORDER == BIG_ENDIAN
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return swap16(x);
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#else
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return x;
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#endif
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}
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u32 to_le32(u32 x)
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{
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#if BYTE_ORDER == BIG_ENDIAN
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return swap32(x);
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#else
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return x;
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#endif
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}
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u64 to_le64(u64 x)
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{
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#if BYTE_ORDER == BIG_ENDIAN
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return swap64(x);
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#else
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return x;
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#endif
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}
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u16 to_be16(u16 x)
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{
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#if BYTE_ORDER == BIG_ENDIAN
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return x;
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#else
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return swap16(x);
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#endif
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}
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u32 to_be32(u32 x)
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{
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#if BYTE_ORDER == BIG_ENDIAN
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return x;
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#else
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return swap32(x);
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#endif
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}
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u64 to_be64(u64 x)
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{
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#if BYTE_ORDER == BIG_ENDIAN
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return x;
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#else
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return swap64(x);
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#endif
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}
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u16 read_le16(const void* p)
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{
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return to_le16(*(u16*)p);
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}
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u32 read_le32(const void* p)
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{
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return to_le32(*(u32*)p);
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}
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u64 read_le64(const void* p)
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{
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return to_le64(*(u64*)p);
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}
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u16 read_be16(const void* p)
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{
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return to_be16(*(u16*)p);
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}
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u32 read_be32(const void* p)
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{
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return to_be32(*(u32*)p);
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}
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u64 read_be64(const void* p)
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{
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return to_be64(*(u64*)p);
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}
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void write_le16(void* p, u16 x)
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{
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*(u16*)p = to_le16(x);
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}
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void write_le32(void* p, u32 x)
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{
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*(u32*)p = to_le32(x);
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}
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void write_le64(void* p, u64 x)
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{
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*(u64*)p = to_le64(x);
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}
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void write_be16(void* p, u16 x)
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{
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*(u16*)p = to_be16(x);
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}
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void write_be32(void* p, u32 x)
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{
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*(u32*)p = to_be32(x);
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}
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void write_be64(void* p, u64 x)
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{
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*(u64*)p = to_be64(x);
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}
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