winamp/Src/Plugins/Input/in_flac/StreamFileWin32.cpp
2024-09-24 14:54:57 +02:00

129 lines
3.9 KiB
C++

/*
** Copyright (C) 2007-2012 Nullsoft, Inc.
**
** This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held
** liable for any damages arising from the use of this software.
**
** Permission is granted to anyone to use this software for any purpose, including commercial applications, and to
** alter it and redistribute it freely, subject to the following restrictions:
**
** 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software.
** If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
**
** 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
**
** 3. This notice may not be removed or altered from any source distribution.
**
** Author: Ben Allison benski@winamp.com
** Created: March 1, 2007
**
*/
#include <windows.h>
#include <FLAC/all.h>
#include <assert.h>
#include "StreamFileWin32.h"
FLAC__StreamDecoderReadStatus Win32_Read(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
{
assert(*bytes <= 4294967295U);
HANDLE file = ((Win32_State *)client_data)->handle;
if(*bytes > 0)
{
assert(sizeof(FLAC__byte) == 1);
DWORD bytesRead=0, bytesToRead=*bytes;
BOOL result = ReadFile(file, buffer, bytesToRead, &bytesRead, NULL);
*bytes = bytesRead;
if (!result)
return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
else if(bytesRead == 0)
{
((Win32_State *)client_data)->endOfFile = true;
return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
}
else
return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
}
else
return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
}
__int64 Seek64(HANDLE hf, __int64 distance, DWORD MoveMethod)
{
LARGE_INTEGER li;
li.QuadPart = distance;
li.LowPart = SetFilePointer (hf, li.LowPart, &li.HighPart, MoveMethod);
if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR)
{
li.QuadPart = -1;
}
return li.QuadPart;
}
FLAC__StreamDecoderSeekStatus Win32_Seek(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)
{
HANDLE file = ((Win32_State *)client_data)->handle;
__int64 result = Seek64(file, absolute_byte_offset, FILE_BEGIN);
if (result == INVALID_SET_FILE_POINTER)
return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
else
{
((Win32_State *)client_data)->endOfFile = false;
return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
}
}
FLAC__StreamDecoderTellStatus Win32_Tell(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
{
HANDLE file = ((Win32_State *)client_data)->handle;
__int64 position = Seek64(file, 0, FILE_CURRENT);
if (position == INVALID_SET_FILE_POINTER)
return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
else
{
*absolute_byte_offset=position;
return FLAC__STREAM_DECODER_TELL_STATUS_OK;
}
}
__int64 FileSize64(HANDLE file)
{
LARGE_INTEGER position;
position.QuadPart=0;
position.LowPart = GetFileSize(file, (LPDWORD)&position.HighPart);
if (position.LowPart == INVALID_FILE_SIZE && GetLastError() != NO_ERROR)
return INVALID_FILE_SIZE;
else
return position.QuadPart;
}
FLAC__StreamDecoderLengthStatus Win32_Length(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)
{
HANDLE file = ((Win32_State *)client_data)->handle;
LARGE_INTEGER position;
position.QuadPart=0;
position.LowPart = GetFileSize(file, (LPDWORD)&position.HighPart);
if (position.LowPart == INVALID_FILE_SIZE && GetLastError() != NO_ERROR)
return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
else
{
*stream_length = position.QuadPart;
return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
}
}
FLAC__bool Win32_EOF(const FLAC__StreamDecoder *decoder, void *client_data)
{
return ((Win32_State *)client_data)->endOfFile;
}