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46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
#pragma once
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#include <SDL_endian.h>
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/*
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* vcmi_endian.h, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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/* Reading values from memory.
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*
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* read_le_u16, read_le_u32 : read a little endian value from
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* memory. On big endian machines, the value will be byteswapped.
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*/
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#if defined(linux) && defined(sparc)
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/* SPARC does not support unaligned memory access. Let gcc know when
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* to emit the right code. */
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struct unaligned_Uint16 { ui16 val __attribute__(( packed )); };
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struct unaligned_Uint32 { ui32 val __attribute__(( packed )); };
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static inline ui16 read_unaligned_u16(const void *p)
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{
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const struct unaligned_Uint16 *v = reinterpret_cast<const struct unaligned_Uint16 *>(p);
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return v->val;
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}
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static inline ui32 read_unaligned_u32(const void *p)
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{
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const struct unaligned_Uint32 *v = reinterpret_cast<const struct unaligned_Uint32 *>(p);
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return v->val;
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}
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#define read_le_u16(p) (SDL_SwapLE16(read_unaligned_u16(p)))
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#define read_le_u32(p) (SDL_SwapLE32(read_unaligned_u32(p)))
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#else
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#define read_le_u16(p) (SDL_SwapLE16(* reinterpret_cast<const ui16 *>(p)))
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#define read_le_u32(p) (SDL_SwapLE32(* reinterpret_cast<const ui32 *>(p)))
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#endif
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