mirror of https://github.com/akuker/RASCSI.git
242 lines
3.7 KiB
C++
242 lines
3.7 KiB
C++
//---------------------------------------------------------------------------
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//
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// X68000 EMULATOR "XM6"
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//
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// Copyright (C) 2001-2006 PI.(ytanaka@ipc-tokai.or.jp)
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// Copyright (C) 2010-2020 GIMONS
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// [ File I/O (Subset for RaSCSI) ]
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//
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//---------------------------------------------------------------------------
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#include "os.h"
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#include "filepath.h"
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#include "fileio.h"
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#include "config.h"
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//===========================================================================
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//
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// File I/O
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//
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//===========================================================================
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Fileio::Fileio()
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{
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// Initialize work
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handle = -1;
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}
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Fileio::~Fileio()
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{
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ASSERT(handle == -1);
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// Safety measure for Release
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Close();
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}
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BOOL Fileio::Load(const Filepath& path, void *buffer, int size)
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{
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ASSERT(buffer);
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ASSERT(size > 0);
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ASSERT(handle < 0);
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if (!Open(path, ReadOnly)) {
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return FALSE;
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}
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if (!Read(buffer, size)) {
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Close();
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return FALSE;
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}
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Close();
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return TRUE;
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}
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BOOL Fileio::Save(const Filepath& path, void *buffer, int size)
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{
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ASSERT(buffer);
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ASSERT(size > 0);
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ASSERT(handle < 0);
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if (!Open(path, WriteOnly)) {
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return FALSE;
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}
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if (!Write(buffer, size)) {
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Close();
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return FALSE;
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}
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Close();
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return TRUE;
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}
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BOOL Fileio::Open(const char *fname, OpenMode mode, BOOL directIO)
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{
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mode_t omode;
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ASSERT(fname);
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ASSERT(handle < 0);
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// Always fail a read from a null array
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if (fname[0] == _T('\0')) {
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handle = -1;
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return FALSE;
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}
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// Default mode
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omode = directIO ? O_DIRECT : 0;
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switch (mode) {
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case ReadOnly:
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handle = open(fname, O_RDONLY | omode);
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break;
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case WriteOnly:
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handle = open(fname, O_CREAT | O_WRONLY | O_TRUNC | omode, 0666);
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break;
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case ReadWrite:
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// Make sure RW does not succeed when reading from CD-ROM
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if (access(fname, 0x06) != 0) {
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return FALSE;
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}
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handle = open(fname, O_RDWR | omode);
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break;
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default:
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ASSERT(FALSE);
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break;
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}
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// Evaluate results
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if (handle == -1) {
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return FALSE;
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}
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ASSERT(handle >= 0);
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return TRUE;
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}
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BOOL Fileio::Open(const char *fname, OpenMode mode)
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{
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return Open(fname, mode, FALSE);
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}
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BOOL Fileio::Open(const Filepath& path, OpenMode mode)
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{
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return Open(path.GetPath(), mode);
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}
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BOOL Fileio::OpenDIO(const char *fname, OpenMode mode)
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{
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// Open with included O_DIRECT
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if (!Open(fname, mode, TRUE)) {
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// Normal mode retry (tmpfs etc.)
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return Open(fname, mode, FALSE);
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}
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return TRUE;
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}
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BOOL Fileio::OpenDIO(const Filepath& path, OpenMode mode)
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{
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return OpenDIO(path.GetPath(), mode);
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}
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BOOL Fileio::Read(void *buffer, int size)
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{
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int count;
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ASSERT(buffer);
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ASSERT(size > 0);
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ASSERT(handle >= 0);
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count = read(handle, buffer, size);
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if (count != size) {
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return FALSE;
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}
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return TRUE;
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}
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BOOL Fileio::Write(const void *buffer, int size)
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{
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int count;
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ASSERT(buffer);
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ASSERT(size > 0);
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ASSERT(handle >= 0);
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count = write(handle, buffer, size);
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if (count != size) {
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return FALSE;
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}
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return TRUE;
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}
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BOOL Fileio::Seek(off_t offset, BOOL relative)
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{
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ASSERT(handle >= 0);
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ASSERT(offset >= 0);
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// Add current position in case of relative seek
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if (relative) {
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offset += GetFilePos();
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}
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if (lseek(handle, offset, SEEK_SET) != offset) {
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return FALSE;
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}
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return TRUE;
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}
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off_t Fileio::GetFileSize()
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{
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off_t cur;
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off_t end;
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ASSERT(handle >= 0);
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// Get file position in 64bit
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cur = GetFilePos();
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// Get file size in64bitで
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end = lseek(handle, 0, SEEK_END);
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// Return to start position
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Seek(cur);
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return end;
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}
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off_t Fileio::GetFilePos() const
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{
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off_t pos;
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ASSERT(handle >= 0);
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// Get file position in 64bit
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pos = lseek(handle, 0, SEEK_CUR);
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return pos;
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}
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void Fileio::Close()
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{
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if (handle != -1) {
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close(handle);
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handle = -1;
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}
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}
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