mirror of
https://github.com/vcmi/vcmi.git
synced 2024-11-28 08:48:48 +02:00
98 lines
2.0 KiB
C++
98 lines
2.0 KiB
C++
/*
|
|
* SDLRWwrapper.cpp, 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
|
|
*
|
|
*/
|
|
|
|
#include "StdInc.h"
|
|
#include "SDLRWwrapper.h"
|
|
|
|
#include "../../lib/filesystem/CInputStream.h"
|
|
|
|
#include <SDL_rwops.h>
|
|
|
|
static inline CInputStream* get_stream(SDL_RWops* context)
|
|
{
|
|
return static_cast<CInputStream*>(context->hidden.unknown.data1);
|
|
}
|
|
|
|
static Sint64 impl_size(SDL_RWops* context)
|
|
{
|
|
return get_stream(context)->getSize();
|
|
}
|
|
|
|
static Sint64 impl_seek(SDL_RWops* context, Sint64 offset, int whence)
|
|
{
|
|
auto stream = get_stream(context);
|
|
switch (whence)
|
|
{
|
|
case RW_SEEK_SET:
|
|
return stream->seek(offset);
|
|
break;
|
|
case RW_SEEK_CUR:
|
|
return stream->seek(stream->tell() + offset);
|
|
break;
|
|
case RW_SEEK_END:
|
|
return stream->seek(stream->getSize() + offset);
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
}
|
|
|
|
static std::size_t impl_read(SDL_RWops* context, void *ptr, size_t size, size_t maxnum)
|
|
{
|
|
auto stream = get_stream(context);
|
|
auto oldpos = stream->tell();
|
|
|
|
auto count = stream->read(static_cast<ui8*>(ptr), size*maxnum);
|
|
|
|
if (count != 0 && count != size*maxnum)
|
|
{
|
|
// if not a whole amount of objects of size has been read, we need to seek
|
|
stream->seek(oldpos + size * (count / size));
|
|
}
|
|
|
|
return count / size;
|
|
}
|
|
|
|
static std::size_t impl_write(SDL_RWops* context, const void *ptr, size_t size, size_t num)
|
|
{
|
|
// writing is not supported
|
|
return 0;
|
|
}
|
|
|
|
static int impl_close(SDL_RWops* context)
|
|
{
|
|
if (context == nullptr)
|
|
return 0;
|
|
|
|
delete get_stream(context);
|
|
SDL_FreeRW(context);
|
|
return 0;
|
|
}
|
|
|
|
|
|
SDL_RWops* MakeSDLRWops(std::unique_ptr<CInputStream> in)
|
|
{
|
|
SDL_RWops* result = SDL_AllocRW();
|
|
if (!result)
|
|
return nullptr;
|
|
|
|
result->size = &impl_size;
|
|
result->seek = &impl_seek;
|
|
result->read = &impl_read;
|
|
result->write = &impl_write;
|
|
result->close = &impl_close;
|
|
|
|
result->type = SDL_RWOPS_UNKNOWN;
|
|
result->hidden.unknown.data1 = in.release();
|
|
|
|
return result;
|
|
}
|