mirror of
https://github.com/libretro/Play-.git
synced 2024-12-12 11:05:36 +00:00
114 lines
2.3 KiB
C++
114 lines
2.3 KiB
C++
#include <string.h>
|
|
#include <fcntl.h>
|
|
#include <stdexcept>
|
|
#include <algorithm>
|
|
#include <cstdlib>
|
|
|
|
#if defined(__APPLE__)
|
|
#include <sys/disk.h>
|
|
#include <sys/stat.h>
|
|
#elif defined(__linux__) || defined(__FreeBSD__)
|
|
#include <unistd.h>
|
|
#include <sys/statvfs.h>
|
|
#endif
|
|
|
|
|
|
#include "Posix_VolumeStream.h"
|
|
|
|
using namespace Framework::Posix;
|
|
|
|
CVolumeStream::CVolumeStream(const char* volumePath)
|
|
{
|
|
m_fd = open(volumePath, O_RDONLY);
|
|
if(m_fd < 0)
|
|
{
|
|
throw std::runtime_error("Couldn't open volume for reading.");
|
|
}
|
|
#if defined(__APPLE__)
|
|
if(ioctl(m_fd, DKIOCGETBLOCKSIZE, &m_sectorSize) < 0)
|
|
{
|
|
throw std::runtime_error("Can't get sector size.");
|
|
}
|
|
#elif defined(__linux__) || defined(__FreeBSD__)
|
|
struct statvfs s;
|
|
if(fstatvfs(m_fd, &s))
|
|
{
|
|
throw std::runtime_error("Can't get sector size.");
|
|
}
|
|
m_sectorSize = s.f_bsize;
|
|
#else
|
|
#error Unsupported
|
|
#endif
|
|
m_cache = malloc(m_sectorSize);
|
|
m_cacheSector = m_sectorSize - 1;
|
|
}
|
|
|
|
CVolumeStream::~CVolumeStream()
|
|
{
|
|
close(m_fd);
|
|
free(m_cache);
|
|
}
|
|
|
|
void CVolumeStream::Seek(int64 distance, STREAM_SEEK_DIRECTION from)
|
|
{
|
|
switch(from)
|
|
{
|
|
case STREAM_SEEK_SET:
|
|
m_position = distance;
|
|
break;
|
|
case STREAM_SEEK_CUR:
|
|
m_position += distance;
|
|
break;
|
|
case STREAM_SEEK_END:
|
|
throw std::runtime_error("Unsupported operation.");
|
|
break;
|
|
}
|
|
}
|
|
|
|
uint64 CVolumeStream::Tell()
|
|
{
|
|
return m_position;
|
|
}
|
|
|
|
uint64 CVolumeStream::Read(void* buffer, uint64 size)
|
|
{
|
|
uint64 retSize = size;
|
|
uint8* dst = reinterpret_cast<uint8*>(buffer);
|
|
uint8* src = reinterpret_cast<uint8*>(m_cache);
|
|
|
|
while(size != 0)
|
|
{
|
|
SyncCache();
|
|
|
|
size_t sectorOffset = static_cast<size_t>(m_position & (m_sectorSize - 1));
|
|
size_t sectorRemain = static_cast<size_t>(m_sectorSize - sectorOffset);
|
|
size_t copy = std::min<size_t>(size, sectorRemain);
|
|
|
|
memcpy(dst, src + sectorOffset, copy);
|
|
m_position += copy;
|
|
size -= copy;
|
|
dst += copy;
|
|
}
|
|
|
|
return retSize;
|
|
}
|
|
|
|
uint64 CVolumeStream::Write(const void* buffer, uint64 size)
|
|
{
|
|
throw std::runtime_error("Not supported.");
|
|
}
|
|
|
|
bool CVolumeStream::IsEOF()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
void CVolumeStream::SyncCache()
|
|
{
|
|
uint64 sectorPosition = m_position & ~(m_sectorSize - 1);
|
|
if(sectorPosition == m_cacheSector) return;
|
|
m_cacheSector = sectorPosition;
|
|
lseek(m_fd, sectorPosition, SEEK_SET);
|
|
read(m_fd, m_cache, m_sectorSize);
|
|
}
|