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amigaos-fs.cpp
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amigaos-fs.cpp
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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#if defined(__amigaos4__)
#include "backends/fs/amigaos/amigaos-fs.h"
#include "backends/fs/stdiostream.h"
#include "common/debug.h"
#include "common/util.h"
/**
* Returns the last component of a given path
*
* @param str Common::String containing the path
* @return Pointer to the first char of the last component inside str
*/
const char *lastPathComponent(const Common::String &str) {
int pathOffset = str.size();
if (pathOffset <= 0) {
debug(6, "lastPathComponent() failed -> Bad offset (Empty path received)!");
return 0;
}
const char *p = str.c_str();
while (pathOffset > 0 && (p[pathOffset - 1] == '/' || p[pathOffset - 1] == ':'))
pathOffset--;
while (pathOffset > 0 && (p[pathOffset - 1] != '/' && p[pathOffset - 1] != ':'))
pathOffset--;
return p + pathOffset;
}
AmigaOSFilesystemNode::AmigaOSFilesystemNode() {
_sDisplayName = "Available HDDs/Partitions";
_bIsValid = true;
_bIsDirectory = true;
_sPath = "";
_pFileLock = 0;
// Protection is ignored for the root volume
_nProt = 0;
}
AmigaOSFilesystemNode::AmigaOSFilesystemNode(const Common::String &p) {
int nodeOffset = p.size();
if (nodeOffset <= 0) {
debug(6, "AmigaOSFileSystemNode() failed -> Bad offset (No Path received)!");
return;
}
_sPath = p;
_sDisplayName = ::lastPathComponent(_sPath);
_pFileLock = 0;
_bIsDirectory = false;
_bIsValid = false;
// Check whether the node exists and if it's a directory
struct ExamineData * pExd = IDOS->ExamineObjectTags(EX_StringNameInput,_sPath.c_str(),TAG_END);
if (pExd) {
_nProt = pExd->Protection;
if (EXD_IS_DIRECTORY(pExd)) {
_bIsDirectory = true;
_pFileLock = IDOS->Lock((CONST_STRPTR)_sPath.c_str(), SHARED_LOCK);
_bIsValid = (_pFileLock != 0);
// Add a trailing slash, if needed
if (_sPath.lastChar() != '/' && _sPath.lastChar() != ':')
_sPath += '/';
} else {
_bIsValid = true;
}
IDOS->FreeDosObject(DOS_EXAMINEDATA, pExd);
}
}
AmigaOSFilesystemNode::AmigaOSFilesystemNode(BPTR pLock, const char *pDisplayName) {
int bufSize = MAXPATHLEN;
_pFileLock = 0;
while (true) {
char *n = new char[bufSize];
if (IDOS->NameFromLock(pLock, (STRPTR)n, bufSize) != DOSFALSE) {
_sPath = n;
_sDisplayName = pDisplayName ? pDisplayName : IDOS->FilePart((STRPTR)n);
delete[] n;
break;
}
if (IDOS->IoErr() != ERROR_LINE_TOO_LONG) {
_bIsValid = false;
debug(6, "IDOS->IoErr() failed -> MAXPATHLEN exceeded!");
delete[] n;
return;
}
bufSize *= 2;
delete[] n;
}
_bIsDirectory = false;
_bIsValid = false;
// Check whether the node exists and if it's a directory
struct ExamineData * pExd = IDOS->ExamineObjectTags(EX_FileLockInput,pLock,TAG_END);
if (pExd) {
_nProt = pExd->Protection;
if (EXD_IS_DIRECTORY(pExd)) {
_bIsDirectory = true;
_pFileLock = IDOS->DupLock(pLock);
_bIsValid = _pFileLock != 0;
// Add a trailing slash, if needed
if (_sPath.lastChar() != '/' && _sPath.lastChar() != ':')
_sPath += '/';
} else {
_bIsValid = true;
}
IDOS->FreeDosObject(DOS_EXAMINEDATA, pExd);
} else {
debug(6, "IDOS->ExamineObjectTags() failed -> Not a directory (or it doesn't exist!");
}
}
// We need the custom copy constructor because of DupLock()
AmigaOSFilesystemNode::AmigaOSFilesystemNode(const AmigaOSFilesystemNode& node)
: AbstractFSNode() {
_sDisplayName = node._sDisplayName;
_bIsValid = node._bIsValid;
_bIsDirectory = node._bIsDirectory;
_sPath = node._sPath;
_pFileLock = IDOS->DupLock(node._pFileLock);
_nProt = node._nProt;
}
AmigaOSFilesystemNode::~AmigaOSFilesystemNode() {
if (_pFileLock)
IDOS->UnLock(_pFileLock);
}
bool AmigaOSFilesystemNode::exists() const {
if (_sPath.empty())
return false;
bool nodeExists = false;
BPTR pLock = IDOS->Lock(_sPath.c_str(), SHARED_LOCK);
if (pLock) {
nodeExists = true;
IDOS->UnLock(pLock);
}
return nodeExists;
}
AbstractFSNode *AmigaOSFilesystemNode::getChild(const Common::String &n) const {
if (!_bIsDirectory) {
debug(6, "AmigaOSFileSystemNode::getChild() failed -> Not a directory!");
return 0;
}
Common::String newPath(_sPath);
if (_sPath.lastChar() != '/')
newPath += '/';
newPath += n;
return new AmigaOSFilesystemNode(newPath);
}
bool AmigaOSFilesystemNode::getChildren(AbstractFSList &myList, ListMode mode, bool hidden) const {
if (!_bIsValid) {
debug(6, "AmigaOSFileSystemNode::getChildren() failed -> Invalid node (Not a Volume)!");
return false;
}
if (!_bIsDirectory) {
debug(6, "AmigaOSFileSystemNode::getChildren() failed -> Invalid node (Not a directory)!");
return false;
}
if (isRootNode()) {
myList = listVolumes();
return true;
}
APTR context = IDOS->ObtainDirContextTags( EX_FileLockInput, _pFileLock,
EX_DoCurrentDir, TRUE, /* for softlinks */
EX_DataFields, (EXF_NAME|EXF_LINK|EXF_TYPE),
TAG_END);
if (context) {
// No need to free the value after usage, everything will be dealt with
// by the DirContext release
struct ExamineData * pExd = NULL;
AmigaOSFilesystemNode *entry;
while ((pExd = IDOS->ExamineDir(context))) {
if ((EXD_IS_FILE(pExd) && (Common::FSNode::kListFilesOnly == mode))
|| (EXD_IS_DIRECTORY(pExd) && (Common::FSNode::kListDirectoriesOnly == mode))
|| Common::FSNode::kListAll == mode
)
{
BPTR pLock = IDOS->Lock(pExd->Name, SHARED_LOCK);
if (pLock) {
entry = new AmigaOSFilesystemNode(pLock, pExd->Name);
if (entry) {
myList.push_back(entry);
}
IDOS->UnLock(pLock);
}
}
}
if (ERROR_NO_MORE_ENTRIES != IDOS->IoErr()) {
debug(6, "IDOS->ExamineDir() failed -> End of list exceeded!");
return false;
}
IDOS->ReleaseDirContext(context);
return true;
} else {
debug(6, "IDOS->ObtainDirContext() failed!");
return false;
}
}
AbstractFSNode *AmigaOSFilesystemNode::getParent() const {
if (isRootNode()) {
return new AmigaOSFilesystemNode(*this);
}
BPTR pLock = _pFileLock;
if (!_bIsDirectory) {
assert(!pLock);
pLock = IDOS->Lock((CONST_STRPTR)_sPath.c_str(), SHARED_LOCK);
assert(pLock);
}
AmigaOSFilesystemNode *node;
BPTR parentDir = IDOS->ParentDir(pLock);
if (parentDir) {
node = new AmigaOSFilesystemNode(parentDir);
IDOS->UnLock(parentDir);
} else
node = new AmigaOSFilesystemNode();
if (!_bIsDirectory) {
IDOS->UnLock(pLock);
}
return node;
}
bool AmigaOSFilesystemNode::isReadable() const {
if (!_bIsValid)
return false;
// Regular RWED protection flags are low-active or inverted,
// thus the negation. Moreover, a pseudo root filesystem is
// always readable, whatever the protection says
bool readable = !(_nProt & EXDF_OTR_READ) || isRootNode();
return readable;
}
bool AmigaOSFilesystemNode::isWritable() const {
if (!_bIsValid)
return false;
// Regular RWED protection flags are low-active or inverted,
// thus the negation. Moreover, a pseudo root filesystem is
// never writable (due of it's pseudo nature), whatever the protection says
bool writable = !(_nProt & EXDF_OTR_WRITE) && !isRootNode();
return writable;
}
AbstractFSList AmigaOSFilesystemNode::listVolumes() const {
AbstractFSList myList;
const uint32 kLockFlags = LDF_READ | LDF_VOLUMES;
char buffer[MAXPATHLEN];
struct DosList *dosList = IDOS->LockDosList(kLockFlags);
if (!dosList) {
debug(6, "IDOS->LockDOSList() failed! -> No Volumes found!");
return myList;
}
dosList = IDOS->NextDosEntry(dosList, LDF_VOLUMES);
while (dosList) {
if (dosList->dol_Type == DLT_VOLUME &&
dosList->dol_Name && dosList->dol_Port) {
// Copy name to buffer
IDOS->CopyStringBSTRToC(dosList->dol_Name, buffer, MAXPATHLEN);
// Volume name + '\0'
size_t volNameSize = strlen(buffer) + 1;
char *volName = new char [volNameSize];
Common::strcpy_s(volName, volNameSize, buffer);
Common::strcat_s(buffer, ":");
BPTR volumeLock = IDOS->Lock((STRPTR)buffer, SHARED_LOCK);
if (volumeLock) {
char *devName = new char [MAXPATHLEN];
// Find device name
IDOS->DevNameFromLock(volumeLock, devName, MAXPATHLEN, DN_DEVICEONLY);
snprintf(buffer, MAXPATHLEN, "%s (%s)", volName, devName);
delete[] devName;
AmigaOSFilesystemNode *entry = new AmigaOSFilesystemNode(volumeLock, buffer);
if (entry) {
myList.push_back(entry);
}
IDOS->UnLock(volumeLock);
}
delete[] volName;
}
dosList = IDOS->NextDosEntry(dosList, LDF_VOLUMES);
}
IDOS->UnLockDosList(kLockFlags);
return myList;
}
Common::SeekableReadStream *AmigaOSFilesystemNode::createReadStream() {
return StdioStream::makeFromPath(getPath(), false);
}
Common::SeekableWriteStream *AmigaOSFilesystemNode::createWriteStream() {
return StdioStream::makeFromPath(getPath(), true);
}
bool AmigaOSFilesystemNode::createDirectory() {
Common::String createPath = _sPath;
if (createPath.lastChar() == '/') {
createPath = createPath.substr(0, createPath.size() - 1);
}
BPTR dirLock = IDOS->CreateDir(createPath.c_str());
if (dirLock) {
IDOS->UnLock(dirLock);
_bIsValid = true;
_bIsDirectory = true;
} else {
debug(6, "AmigaOSFilesystemNode::createDirectory() failed -> Directory '%s' could not be created!", createPath.c_str());
}
return _bIsValid && _bIsDirectory;
}
#endif