mirror of
https://github.com/vcmi/vcmi.git
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71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
/*
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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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#pragma once
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//FIXME:library file depends on SDL - make cause troubles
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#include <SDL_endian.h>
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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(__linux) || defined(__linux__)) && (defined(sparc) || defined(__arm__))
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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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#define PACKED_STRUCT __attribute__(( packed ))
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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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#define PACKED_STRUCT
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#endif
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static inline char readChar(const ui8 * buffer, int & i)
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{
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return buffer[i++];
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}
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static inline std::string readString(const ui8 * buffer, int & i)
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{
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int len = read_le_u32(buffer + i);
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i += 4;
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assert(len >= 0 && len <= 500000); //not too long
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std::string ret;
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ret.reserve(len);
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for(int gg = 0; gg < len; ++gg)
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{
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ret += buffer[i++];
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}
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return ret;
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}
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