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#include "stream.h"
#ifdef _WIN32
#include <share.h>
#endif
#include "slang-io.h"
namespace Slang
{
FileStream::FileStream(const Slang::String & fileName, FileMode fileMode)
{
Init(fileName, fileMode, fileMode==FileMode::Open?FileAccess::Read:FileAccess::Write, FileShare::None);
}
FileStream::FileStream(const Slang::String & fileName, FileMode fileMode, FileAccess access, FileShare share)
{
Init(fileName, fileMode, access, share);
}
void FileStream::Init(const Slang::String & fileName, FileMode fileMode, FileAccess access, FileShare share)
{
const wchar_t * mode = L"rt";
const char* modeMBCS = "rt";
switch (fileMode)
{
case Slang::FileMode::Create:
if (access == FileAccess::Read)
throw ArgumentException("Read-only access is incompatible with Create mode.");
else if (access == FileAccess::ReadWrite)
{
mode = L"w+b";
modeMBCS = "w+b";
this->fileAccess = FileAccess::ReadWrite;
}
else
{
mode = L"wb";
modeMBCS = "wb";
this->fileAccess = FileAccess::Write;
}
break;
case Slang::FileMode::Open:
if (access == FileAccess::Read)
{
mode = L"rb";
modeMBCS = "rb";
this->fileAccess = FileAccess::Read;
}
else if (access == FileAccess::ReadWrite)
{
mode = L"r+b";
modeMBCS = "r+b";
this->fileAccess = FileAccess::ReadWrite;
}
else
{
mode = L"wb";
modeMBCS = "wb";
this->fileAccess = FileAccess::Write;
}
break;
case Slang::FileMode::CreateNew:
if (File::exists(fileName))
{
throw IOException("Failed opening '" + fileName + "', file already exists.");
}
if (access == FileAccess::Read)
throw ArgumentException("Read-only access is incompatible with Create mode.");
else if (access == FileAccess::ReadWrite)
{
mode = L"w+b";
this->fileAccess = FileAccess::ReadWrite;
}
else
{
mode = L"wb";
this->fileAccess = FileAccess::Write;
}
break;
case Slang::FileMode::Append:
if (access == FileAccess::Read)
throw ArgumentException("Read-only access is incompatible with Append mode.");
else if (access == FileAccess::ReadWrite)
{
mode = L"a+b";
this->fileAccess = FileAccess::ReadWrite;
}
else
{
mode = L"ab";
this->fileAccess = FileAccess::Write;
}
break;
default:
break;
}
#ifdef _WIN32
int shFlag = _SH_DENYRW;
switch (share)
{
case Slang::FileShare::None:
shFlag = _SH_DENYRW;
break;
case Slang::FileShare::ReadOnly:
shFlag = _SH_DENYWR;
break;
case Slang::FileShare::WriteOnly:
shFlag = _SH_DENYRD;
break;
case Slang::FileShare::ReadWrite:
shFlag = _SH_DENYNO;
break;
default:
throw ArgumentException("Invalid file share mode.");
break;
}
if (share == Slang::FileShare::None)
#pragma warning(suppress:4996)
handle = _wfopen(fileName.toWString(), mode);
else
handle = _wfsopen(fileName.toWString(), mode, shFlag);
#else
handle = fopen(fileName.getBuffer(), modeMBCS);
#endif
if (!handle)
{
throw IOException("Cannot open file '" + fileName + "'");
}
}
FileStream::~FileStream()
{
Close();
}
Int64 FileStream::GetPosition()
{
#if defined(_WIN32) || defined(__CYGWIN__)
fpos_t pos;
fgetpos(handle, &pos);
return pos;
#elif defined(__APPLE__)
return ftell(handle);
#else
fpos64_t pos;
fgetpos64(handle, &pos);
return *(Int64*)(&pos);
#endif
}
void FileStream::Seek(SeekOrigin origin, Int64 offset)
{
int _origin;
switch (origin)
{
case Slang::SeekOrigin::Start:
_origin = SEEK_SET;
endReached = false;
break;
case Slang::SeekOrigin::End:
_origin = SEEK_END;
// JS TODO: This doesn't seem right, the offset can mean it's not at the end
endReached = true;
break;
case Slang::SeekOrigin::Current:
_origin = SEEK_CUR;
endReached = false;
break;
default:
throw NotSupportedException("Unsupported seek origin.");
break;
}
#ifdef _WIN32
int rs = _fseeki64(handle, offset, _origin);
#else
int rs = fseek(handle, (int)offset, _origin);
#endif
if (rs != 0)
{
throw IOException("FileStream seek failed.");
}
}
Int64 FileStream::Read(void * buffer, Int64 length)
{
auto bytes = fread_s(buffer, (size_t)length, 1, (size_t)length, handle);
if (bytes == 0 && length > 0)
{
if (!feof(handle))
throw IOException("FileStream read failed.");
else if (endReached)
throw EndOfStreamException("End of file is reached.");
endReached = true;
}
return (int)bytes;
}
Int64 FileStream::Write(const void * buffer, Int64 length)
{
auto bytes = (Int64)fwrite(buffer, 1, (size_t)length, handle);
if (bytes < length)
{
throw IOException("FileStream write failed.");
}
return bytes;
}
bool FileStream::CanRead()
{
return ((int)fileAccess & (int)FileAccess::Read) != 0;
}
bool FileStream::CanWrite()
{
return ((int)fileAccess & (int)FileAccess::Write) != 0;
}
void FileStream::Close()
{
if (handle)
{
fclose(handle);
handle = 0;
}
}
bool FileStream::IsEnd()
{
return endReached;
}
// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! MemoryStream !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
void MemoryStream::Seek(SeekOrigin origin, Int64 offset)
{
Int64 pos = 0;
switch (origin)
{
case Slang::SeekOrigin::Start:
pos = offset;
break;
case Slang::SeekOrigin::End:
pos = Int64(m_contents.getCount()) + offset;
break;
case Slang::SeekOrigin::Current:
pos = Int64(m_position) + offset;
break;
default:
throw NotSupportedException("Unsupported seek origin.");
break;
}
m_atEnd = false;
// Clamp to the valid range
pos = (pos < 0) ? 0 : pos;
pos = (pos > Int64(m_contents.getCount())) ? Int64(m_contents.getCount()) : pos;
m_position = UInt(pos);
}
Int64 MemoryStream::Read(void * buffer, Int64 length)
{
if (!CanRead())
{
throw IOException("Cannot read this stream.");
}
const Int64 maxRead = Int64(m_contents.getCount() - m_position);
if (maxRead == 0 && length > 0)
{
m_atEnd = true;
throw EndOfStreamException("End of file is reached.");
}
length = length > maxRead ? maxRead : length;
::memcpy(buffer, m_contents.begin() + m_position, size_t(length));
m_position += UInt(length);
return maxRead;
}
Int64 MemoryStream::Write(const void * buffer, Int64 length)
{
if (!CanWrite())
{
throw IOException("Cannot write this stream.");
}
if (m_position == m_contents.getCount())
{
m_contents.addRange((const uint8_t*)buffer, UInt(length));
}
else
{
m_contents.insertRange(m_position, (const uint8_t*)buffer, UInt(length));
}
m_atEnd = false;
m_position += UInt(length);
return length;
}
}
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