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/*
* vcmi_endian.h, part of VCMI engine
*
* Authors: listed in file AUTHORS in main folder
*
* License: GNU General Public License v2.0 or later
* Full text of license available in license.txt file, in main folder
*
*/
#pragma once
//FIXME:library file depends on SDL - make cause troubles
#include <SDL_endian.h>
/* Reading values from memory.
*
* read_le_u16, read_le_u32 : read a little endian value from
* memory. On big endian machines, the value will be byteswapped.
*/
#if (defined(linux) || defined(__linux) || defined(__linux__)) && (defined(sparc) || defined(__arm__))
/* SPARC does not support unaligned memory access. Let gcc know when
* to emit the right code. */
struct unaligned_Uint16 { ui16 val __attribute__(( packed )); };
struct unaligned_Uint32 { ui32 val __attribute__(( packed )); };
static inline ui16 read_unaligned_u16(const void *p)
{
const struct unaligned_Uint16 *v = reinterpret_cast<const struct unaligned_Uint16 *>(p);
return v->val;
}
static inline ui32 read_unaligned_u32(const void *p)
{
const struct unaligned_Uint32 *v = reinterpret_cast<const struct unaligned_Uint32 *>(p);
return v->val;
}
#define read_le_u16(p) (SDL_SwapLE16(read_unaligned_u16(p)))
#define read_le_u32(p) (SDL_SwapLE32(read_unaligned_u32(p)))
#define PACKED_STRUCT __attribute__(( packed ))
#else
#define read_le_u16(p) (SDL_SwapLE16(* reinterpret_cast<const ui16 *>(p)))
#define read_le_u32(p) (SDL_SwapLE32(* reinterpret_cast<const ui32 *>(p)))
#define PACKED_STRUCT
#endif
static inline char readChar(const ui8 * buffer, int & i)
{
return buffer[i++];
}
static inline std::string readString(const ui8 * buffer, int & i)
{
int len = read_le_u32(buffer + i);
i += 4;
assert(len >= 0 && len <= 500000); //not too long
std::string ret;
ret.reserve(len);
for(int gg = 0; gg < len; ++gg)
{
ret += buffer[i++];
}
return ret;
}
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