/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright (C) 2014 TeamWin - bigbiff and Dees_Troy mtp database conversion to C++
*/
#include "MtpDebug.h"
#include "MtpStorage.h"
#include "MtpDataPacket.h"
#include "MtpServer.h"
#include "MtpEventPacket.h"
#include "MtpDatabase.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <limits.h>
#include <pthread.h>
#include <signal.h>
#include <sys/inotify.h>
#include <fcntl.h>
#define WATCH_FLAGS ( IN_CREATE | IN_DELETE | IN_MOVE | IN_MODIFY )
MtpStorage::MtpStorage(MtpStorageID id, const char* filePath,
const char* description, uint64_t reserveSpace,
bool removable, uint64_t maxFileSize, MtpServer* refserver)
: mStorageID(id),
mFilePath(filePath),
mDescription(description),
mMaxCapacity(0),
mMaxFileSize(maxFileSize),
mReserveSpace(reserveSpace),
mRemovable(removable),
mServer(refserver)
{
MTPI("MtpStorage id: %d path: %s\n", id, filePath);
inotify_thread = 0;
sendEvents = false;
handleCurrentlySending = 0;
use_mutex = true;
if (pthread_mutex_init(&mtpMutex, NULL) != 0) {
MTPE("Failed to init mtpMutex\n");
use_mutex = false;
}
if (pthread_mutex_init(&inMutex, NULL) != 0) {
MTPE("Failed to init inMutex\n");
use_mutex = false;
}
}
MtpStorage::~MtpStorage() {
if (inotify_thread) {
// TODO: what does this do? manpage says it does not kill the thread
pthread_kill(inotify_thread, 0);
for (std::map<int, Tree*>::iterator i = inotifymap.begin(); i != inotifymap.end(); i++) {
inotify_rm_watch(inotify_fd, i->first);
}
close(inotify_fd);
}
for (iter i = mtpmap.begin(); i != mtpmap.end(); i++) {
delete i->second;
}
if (use_mutex) {
use_mutex = false;
pthread_mutex_destroy(&mtpMutex);
pthread_mutex_destroy(&inMutex);
}
}
int MtpStorage::getType() const {
return (mRemovable ? MTP_STORAGE_REMOVABLE_RAM : MTP_STORAGE_FIXED_RAM);
}
int MtpStorage::getFileSystemType() const {
return MTP_STORAGE_FILESYSTEM_HIERARCHICAL;
}
int MtpStorage::getAccessCapability() const {
return MTP_STORAGE_READ_WRITE;
}
uint64_t MtpStorage::getMaxCapacity() {
if (mMaxCapacity == 0) {
struct statfs stat;
if (statfs(getPath(), &stat))
return -1;
mMaxCapacity = (uint64_t)stat.f_blocks * (uint64_t)stat.f_bsize;
}
return mMaxCapacity;
}
uint64_t MtpStorage::getFreeSpace() {
struct statfs stat;
if (statfs(getPath(), &stat))
return -1;
uint64_t freeSpace = (uint64_t)stat.f_bavail * (uint64_t)stat.f_bsize;
return (freeSpace > mReserveSpace ? freeSpace - mReserveSpace : 0);
}
const char* MtpStorage::getDescription() const {
return (const char *)mDescription;
}
int MtpStorage::createDB() {
std::string mtpParent = "";
mtpstorageparent = getPath();
// root directory is special: handle 0, parent 0, and empty path
mtpmap[0] = new Tree(0, 0, "");
MTPD("MtpStorage::createDB DONE\n");
if (use_mutex) {
MTPD("Starting inotify thread\n");
sendEvents = true;
inotify_thread = inotify();
} else {
MTPD("NOT starting inotify thread\n");
}
// for debugging and caching purposes, read the root dir already now
readDir(mtpstorageparent, mtpmap[0]);
// all other dirs are read on demand
return 0;
}
MtpObjectHandleList* MtpStorage::getObjectList(MtpStorageID storageID, MtpObjectHandle parent) {
MTPD("MtpStorage::getObjectList, parent: %u\n", parent);
//append object id (numerical #s) of database to int array
MtpObjectHandleList* list = new MtpObjectHandleList();
if (parent == MTP_PARENT_ROOT) {
MTPD("parent == MTP_PARENT_ROOT\n");
parent = 0;
}
if (mtpmap.find(parent) == mtpmap.end()) {
MTPE("parent handle not found, returning empty list\n");
return list;
}
Tree* tree = mtpmap[parent];
if (!tree->wasAlreadyRead())
{
std::string path = getNodePath(tree);
MTPD("reading directory on demand for tree %p (%u), path: %s\n", tree, tree->Mtpid(), path.c_str());
readDir(path, tree);
}
mtpmap[parent]->getmtpids(list);
MTPD("returning %u objects in %s.\n", list->size(), tree->getName().c_str());
return list;
}
int MtpStorage::getObjectInfo(MtpObjectHandle handle, MtpObjectInfo& info) {
struct stat st;
uint64_t size = 0;
MTPD("MtpStorage::getObjectInfo, handle: %u\n", handle);
Node* node = findNode(handle);
if (!node) {
// Item is not on this storage device
return -1;
}
info.mStorageID = getStorageID();
MTPD("info.mStorageID: %u\n", info.mStorageID);
info.mParent = node->getMtpParentId();
MTPD("mParent: %u\n", info.mParent);
// TODO: do we want to lstat again here, or read from the node properties?
if (lstat(getNodePath(node).c_str(), &st) == 0)
size = st.st_size;
MTPD("size is: %llu\n", size);
info.mCompressedSize = (size > 0xFFFFFFFFLL ? 0xFFFFFFFF : size);
info.mDateModified = st.st_mtime;
if (S_ISDIR(st.st_mode)) {
info.mFormat = MTP_FORMAT_ASSOCIATION;
}
else {
info.mFormat = MTP_FORMAT_UNDEFINED;
}
info.mName = strdup(node->getName().c_str());
MTPD("MtpStorage::getObjectInfo found, Exiting getObjectInfo()\n");
return 0;
}
MtpObjectHandle MtpStorage::beginSendObject(const char* path,
MtpObjectFormat format,
MtpObjectHandle parent,
uint64_t size,
time_t modified) {
MTPD("MtpStorage::beginSendObject(), path: '%s', parent: %u, format: %04x\n", path, parent, format);
iter it = mtpmap.find(parent);
if (it == mtpmap.end()) {
MTPE("parent node not found, returning error\n");
return kInvalidObjectHandle;
}
Tree* tree = it->second;
std::string pathstr(path);
size_t slashpos = pathstr.find_last_of('/');
if (slashpos == std::string::npos) {
MTPE("path has no slash, returning error\n");
return kInvalidObjectHandle;
}
std::string parentdir = pathstr.substr(0, slashpos);
std::string basename = pathstr.substr(slashpos + 1);
if (parent != 0 && parentdir != getNodePath(tree)) {
MTPE("beginSendObject into path '%s' but parent tree has path '%s', returning error\n", parentdir.c_str(), getNodePath(tree).c_str());
return kInvalidObjectHandle;
}
MTPD("MtpStorage::beginSendObject() parentdir: %s basename: %s\n", parentdir.c_str(), basename.c_str());
// note: for directories, the mkdir call is done later in MtpServer, here we just reserve a handle
bool isDir = format == MTP_FORMAT_ASSOCIATION;
Node* node = addNewNode(isDir, tree, basename);
handleCurrentlySending = node->Mtpid(); // suppress inotify for this node while sending
return node->Mtpid();
}
void MtpStorage::endSendObject(const char* path, MtpObjectHandle handle, MtpObjectFormat format, bool succeeded)
{
Node* node = findNode(handle);
if (!node)
return; // just ignore if this is for another storage
node->addProperties(path, mStorageID);
handleCurrentlySending = 0;
// TODO: are we supposed to send an event about an upload by the initiator?
if (sendEvents)
mServer->sendObjectAdded(node->Mtpid());
}
int MtpStorage::getObjectFilePath(MtpObjectHandle handle, MtpString& outFilePath, int64_t& outFileLength, MtpObjectFormat& outFormat) {
MTPD("MtpStorage::getObjectFilePath handle: %u\n", handle);
Node* node = findNode(handle);
if (!node)
{
// Item is not on this storage device
return -1;
}
// TODO: do we want to lstat here, or just read the info from the node?
struct stat st;
if (lstat(getNodePath(node).c_str(), &st) == 0)
outFileLength = st.st_size;
else
outFileLength = 0;
outFilePath = getNodePath(node).c_str();
MTPD("outFilePath: %s\n", outFilePath.string());
outFormat = node->isDir() ? MTP_FORMAT_ASSOCIATION : MTP_FORMAT_UNDEFINED;
return 0;
}
int MtpStorage::readDir(const std::string& path, Tree* tree)
{
struct dirent *de;
int storageID = getStorageID();
MtpObjectHandle parent = tree->Mtpid();
DIR *d = opendir(path.c_str());
MTPD("reading dir '%s', parent handle %u\n", path.c_str(), parent);
if (d == NULL) {
MTPE("error opening '%s' -- error: %s\n", path.c_str(), strerror(errno));
return -1;
}
// TODO: for refreshing dirs: capture old entries here
while ((de = readdir(d)) != NULL) {
// Because exfat-fuse causes issues with dirent, we will use stat
// for some things that dirent should be able to do
std::string item = path + "/" + de->d_name;
struct stat st;
if (lstat(item.c_str(), &st)) {
MTPE("Error running lstat on '%s'\n", item.c_str());
return -1;
}
// TODO: if we want to use this for refreshing dirs too, first find existing name and overwrite
if (strcmp(de->d_name, ".") == 0)
continue;
if (strcmp(de->d_name, "..") == 0)
continue;
Node* node = addNewNode(st.st_mode & S_IFDIR, tree, de->d_name);
node->addProperties(item, storageID);
//if (sendEvents)
// mServer->sendObjectAdded(node->Mtpid());
// sending events here makes simple-mtpfs very slow, and it is probably the wrong thing to do anyway
}
closedir(d);
// TODO: for refreshing dirs: remove entries that no longer exist (with their nodes)
tree->setAlreadyRead(true);
addInotify(tree);
return 0;
}
int MtpStorage::deleteFile(MtpObjectHandle handle) {
MTPD("MtpStorage::deleteFile handle: %u\n", handle);
Node* node = findNode(handle);
if (!node) {
// Item is not on this storage device
return -1;
}
MtpObjectHandle parent = node->getMtpParentId();
Tree* tree = mtpmap[parent];
if (!tree) {
MTPE("parent tree for handle %u not found\n", parent);
return -1;
}
if (node->isDir()) {
MTPD("deleting tree from mtpmap: %u\n", handle);
mtpmap.erase(handle);
}
MTPD("deleting handle: %u\n", handle);
tree->deleteNode(handle);
MTPD("deleted\n");
return 0;
}
void MtpStorage::queryNodeProperties(std::vector<MtpStorage::PropEntry>& results, Node* node, uint32_t property, int groupCode, MtpStorageID storageID)
{
MTPD("queryNodeProperties handle %u, path: %s\n", node->Mtpid(), getNodePath(node).c_str());
PropEntry pe;
pe.handle = node->Mtpid();
pe.property = property;
if (property == 0xffffffff)
{
// add all properties
MTPD("MtpStorage::queryNodeProperties for all properties\n");
std::vector<Node::mtpProperty> mtpprop = node->getMtpProps();
for (size_t i = 0; i < mtpprop.size(); ++i) {
pe.property = mtpprop[i].property;
pe.datatype = mtpprop[i].dataType;
pe.intvalue = mtpprop[i].valueInt;
pe.strvalue = mtpprop[i].valueStr;
results.push_back(pe);
}
return;
}
else if (property == 0)
{
// TODO: use groupCode
}
// single property
// TODO: this should probably be moved to the Node class and/or merged with getObjectPropertyValue
switch (property) {
// case MTP_PROPERTY_OBJECT_FORMAT:
// pe.datatype = MTP_TYPE_UINT16;
// pe.intvalue = node->getIntProperty(MTP_PROPERTY_OBJECT_FORMAT);
// break;
case MTP_PROPERTY_STORAGE_ID:
pe.datatype = MTP_TYPE_UINT32;
pe.intvalue = storageID;
break;
case MTP_PROPERTY_PROTECTION_STATUS:
pe.datatype = MTP_TYPE_UINT16;
pe.intvalue = 0;
break;
case MTP_PROPERTY_OBJECT_SIZE:
{
pe.datatype = MTP_TYPE_UINT64;
struct stat st;
pe.intvalue = 0;
if (lstat(getNodePath(node).c_str(), &st) == 0)
pe.intvalue = st.st_size;
break;
}
default:
{
const Node::mtpProperty& prop = node->getProperty(property);
if (prop.property != property)
{
MTPD("queryNodeProperties: unknown property %x\n", property);
return;
}
pe.datatype = prop.dataType;
pe.intvalue = prop.valueInt;
pe.strvalue = prop.valueStr;
// TODO: all the special case stuff in MyMtpDatabase::getObjectPropertyValue is missing here
}
}
results.push_back(pe);
}
int MtpStorage::getObjectPropertyList(MtpObjectHandle handle, uint32_t format, uint32_t property, int groupCode, int depth, MtpDataPacket& packet) {
MTPD("MtpStorage::getObjectPropertyList handle: %u, format: %x, property: %x\n", handle, format, property);
if (groupCode != 0)
{
MTPE("getObjectPropertyList: groupCode unsupported\n");
return -1; // TODO: RESPONSE_SPECIFICATION_BY_GROUP_UNSUPPORTED
}
// TODO: support all the special stuff, like:
// handle == 0 -> all objects at the root level
// handle == 0xffffffff -> all objects (on all storages? how could we support that?)
// format == 0 -> all formats, otherwise filter by ObjectFormatCode
// property == 0xffffffff -> all properties except those with group code 0xffffffff
// if property == 0 then use groupCode
// groupCode == 0 -> return Specification_By_Group_Unsupported
// depth == 0xffffffff -> all objects incl. and below handle
std::vector<PropEntry> results;
if (handle == 0xffffffff) {
// TODO: all object on all storages (needs a different design, result packet needs to be built by server instead of storage)
} else if (handle == 0) {
// all objects at the root level
Tree* root = mtpmap[0];
MtpObjectHandleList list;
root->getmtpids(&list);
for (MtpObjectHandleList::iterator it = list.begin(); it != list.end(); ++it) {
Node* node = root->findNode(*it);
if (!node) {
MTPE("BUG: node not found for root entry with handle %u\n", *it);
break;
}
queryNodeProperties(results, node, property, groupCode, mStorageID);
}
} else {
// single object
Node* node = findNode(handle);
if (!node) {
// Item is not on this storage device
return -1;
}
queryNodeProperties(results, node, property, groupCode, mStorageID);
}
MTPD("count: %u\n", results.size());
packet.putUInt32(results.size());
for (size_t i = 0; i < results.size(); ++i) {
PropEntry& p = results[i];
MTPD("handle: %u, propertyCode: %x = %s, datatype: %x, value: %llu\n",
p.handle, p.property, MtpDebug::getObjectPropCodeName(p.property),
p.datatype, p.intvalue);
packet.putUInt32(p.handle);
packet.putUInt16(p.property);
packet.putUInt16(p.datatype);
switch (p.datatype) {
case MTP_TYPE_INT8:
MTPD("MTP_TYPE_INT8\n");
packet.putInt8(p.intvalue);
break;
case MTP_TYPE_UINT8:
MTPD("MTP_TYPE_UINT8\n");
packet.putUInt8(p.intvalue);
break;
case MTP_TYPE_INT16:
MTPD("MTP_TYPE_INT16\n");
packet.putInt16(p.intvalue);
break;
case MTP_TYPE_UINT16:
MTPD("MTP_TYPE_UINT16\n");
packet.putUInt16(p.intvalue);
break;
case MTP_TYPE_INT32:
MTPD("MTP_TYPE_INT32\n");
packet.putInt32(p.intvalue);
break;
case MTP_TYPE_UINT32:
MTPD("MTP_TYPE_UINT32\n");
packet.putUInt32(p.intvalue);
break;
case MTP_TYPE_INT64:
MTPD("MTP_TYPE_INT64\n");
packet.putInt64(p.intvalue);
break;
case MTP_TYPE_UINT64:
MTPD("MTP_TYPE_UINT64\n");
packet.putUInt64(p.intvalue);
break;
case MTP_TYPE_INT128:
MTPD("MTP_TYPE_INT128\n");
packet.putInt128(p.intvalue);
break;
case MTP_TYPE_UINT128:
MTPD("MTP_TYPE_UINT128\n");
packet.putUInt128(p.intvalue);
break;
case MTP_TYPE_STR:
MTPD("MTP_TYPE_STR: %s\n", p.strvalue.c_str());
packet.putString(p.strvalue.c_str());
break;
default:
MTPE("bad or unsupported data type: %x in MyMtpDatabase::getObjectPropertyList", p.datatype);
break;
}
}
return 0;
}
int MtpStorage::renameObject(MtpObjectHandle handle, std::string newName) {
MTPD("MtpStorage::renameObject, handle: %u, new name: '%s'\n", handle, newName.c_str());
if (handle == MTP_PARENT_ROOT) {
MTPE("parent == MTP_PARENT_ROOT, cannot rename root\n");
return -1;
} else {
for (iter i = mtpmap.begin(); i != mtpmap.end(); i++) {
Node* node = i->second->findNode(handle);
if (node != NULL) {
std::string oldName = getNodePath(node);
std::string parentdir = oldName.substr(0, oldName.find_last_of('/'));
std::string newFullName = parentdir + "/" + newName;
MTPD("old: '%s', new: '%s'\n", oldName.c_str(), newFullName.c_str());
if (rename(oldName.c_str(), newFullName.c_str()) == 0) {
node->rename(newName);
return 0;
} else {
MTPE("MtpStorage::renameObject failed, handle: %u, new name: '%s'\n", handle, newName.c_str());
return -1;
}
}
}
}
// handle not found on this storage
return -1;
}
int MtpStorage::getObjectPropertyValue(MtpObjectHandle handle, MtpObjectProperty property, MtpStorage::PropEntry& pe) {
Node *node;
for (iter i = mtpmap.begin(); i != mtpmap.end(); i++) {
node = i->second->findNode(handle);
if (node != NULL) {
const Node::mtpProperty& prop = node->getProperty(property);
if (prop.property != property) {
MTPD("getObjectPropertyValue: unknown property %x for handle %u\n", property, handle);
return -1;
}
pe.datatype = prop.dataType;
pe.intvalue = prop.valueInt;
pe.strvalue = prop.valueStr;
pe.handle = handle;
pe.property = property;
return 0;
}
}
// handle not found on this storage
return -1;
}
pthread_t MtpStorage::inotify(void) {
pthread_t thread;
ThreadPtr inotifyptr = &MtpStorage::inotify_t;
PThreadPtr p = *(PThreadPtr*)&inotifyptr;
pthread_create(&thread, NULL, p, this);
return thread;
}
int MtpStorage::addInotify(Tree* tree) {
std::string path = getNodePath(tree);
MTPD("adding inotify for tree %x, dir: %s\n", tree, path.c_str());
int wd = inotify_add_watch(inotify_fd, path.c_str(), WATCH_FLAGS);
if (wd < 0) {
MTPE("inotify_add_watch failed: %s\n", strerror(errno));
return -1;
}
inotifymap[wd] = tree;
return 0;
}
void MtpStorage::handleInotifyEvent(struct inotify_event* event)
{
std::map<int, Tree*>::iterator it = inotifymap.find(event->wd);
if (it == inotifymap.end()) {
MTPE("Unable to locate inotify_wd: %i\n", event->wd);
return;
}
Tree* tree = it->second;
MTPD("inotify_t tree: %x '%s'\n", tree, tree->getName().c_str());
Node* node = tree->findEntryByName(basename(event->name));
if (node && node->Mtpid() == handleCurrentlySending) {
MTPD("ignoring inotify event for currently uploading file, handle: %u\n", node->Mtpid());
return;
}
if (event->mask & IN_CREATE || event->mask & IN_MOVED_TO) {
if (event->mask & IN_ISDIR) {
MTPD("inotify_t create is dir\n");
} else {
MTPD("inotify_t create is file\n");
}
if (node == NULL) {
node = addNewNode(event->mask & IN_ISDIR, tree, event->name);
std::string item = getNodePath(tree) + "/" + event->name;
node->addProperties(item, getStorageID());
mServer->sendObjectAdded(node->Mtpid());
} else {
MTPD("inotify_t item already exists.\n");
}
if (event->mask & IN_ISDIR) {
// TODO: do we need to do anything here? probably not until someone reads from the dir...
}
} else if (event->mask & IN_DELETE || event->mask & IN_MOVED_FROM) {
if (event->mask & IN_ISDIR) {
MTPD("inotify_t Directory %s deleted\n", event->name);
} else {
MTPD("inotify_t File %s deleted\n", event->name);
}
if (node)
{
if (event->mask & IN_ISDIR) {
for (std::map<int, Tree*>::iterator it = inotifymap.begin(); it != inotifymap.end(); ++it) {
if (it->second == node) {
inotify_rm_watch(inotify_fd, it->first);
MTPD("inotify_t removing watch on '%s'\n", getNodePath(it->second).c_str());
inotifymap.erase(it->first);
break;
}
}
}
MtpObjectHandle handle = node->Mtpid();
deleteFile(handle);
mServer->sendObjectRemoved(handle);
} else {
MTPD("inotify_t already removed.\n");
}
} else if (event->mask & IN_MODIFY) {
MTPD("inotify_t item %s modified.\n", event->name);
if (node != NULL) {
uint64_t orig_size = node->getProperty(MTP_PROPERTY_OBJECT_SIZE).valueInt;
struct stat st;
uint64_t new_size = 0;
if (lstat(getNodePath(node).c_str(), &st) == 0)
new_size = (uint64_t)st.st_size;
if (orig_size != new_size) {
MTPD("size changed from %llu to %llu on mtpid: %u\n", orig_size, new_size, node->Mtpid());
node->updateProperty(MTP_PROPERTY_OBJECT_SIZE, new_size, "", MTP_TYPE_UINT64);
mServer->sendObjectUpdated(node->Mtpid());
}
} else {
MTPE("inotify_t modified item not found\n");
}
} else if (event->mask & IN_DELETE_SELF || event->mask & IN_MOVE_SELF) {
// TODO: is this always already handled by IN_DELETE for the parent dir?
}
}
int MtpStorage::inotify_t(void) {
#define EVENT_SIZE ( sizeof(struct inotify_event) )
#define EVENT_BUF_LEN ( 1024 * ( EVENT_SIZE + 16) )
char buf[EVENT_BUF_LEN];
MTPD("inotify thread: inotify_init\n");
inotify_fd = inotify_init();
if (inotify_fd < 0) {
MTPE("Can't run inotify for mtp server: %s\n", strerror(errno));
return -1;
}
while (true) {
int i = 0;
int len = read(inotify_fd, buf, EVENT_BUF_LEN);
if (len < 0) {
if (errno == EINTR)
continue;
MTPE("inotify_t Can't read inotify events\n");
}
while (i < len) {
struct inotify_event *event = (struct inotify_event *) &buf[i];
if (event->len) {
MTPD("inotify event: wd: %i, mask: %x, name: %s\n", event->wd, event->mask, event->name);
lockMutex(1);
handleInotifyEvent(event);
unlockMutex(1);
}
i += EVENT_SIZE + event->len;
}
}
for (std::map<int, Tree*>::iterator i = inotifymap.begin(); i != inotifymap.end(); i++) {
inotify_rm_watch(inotify_fd, i->first);
}
close(inotify_fd);
return 0;
}
Node* MtpStorage::findNodeByPath(const std::string& path) {
MTPD("findNodeByPath: %s\n", path.c_str());
std::string match = path.substr(0, mtpstorageparent.size());
if (match != mtpstorageparent) {
// not on this device
MTPD("no match: %s is not on storage %s\n", match.c_str(), mtpstorageparent.c_str());
return NULL;
}
// TODO: fix and test this
std::string p = path.substr(mtpstorageparent.size()+1); // cut off "/" after storage root too
Tree* tree = mtpmap[0]; // start at storage root
Node* node = NULL;
while (!p.empty()) {
size_t slashpos = p.find('/');
std::string e;
if (slashpos != std::string::npos) {
e = p;
p.clear();
} else {
e = p.substr(0, slashpos);
p = p.substr(slashpos + 1);
}
MTPD("path element: %s, rest: %s\n", e.c_str(), p.c_str());
node = tree->findEntryByName(e);
if (!node) {
MTPE("path element of %s not found: %s\n", path.c_str(), e.c_str());
return NULL;
}
if (node->isDir())
tree = static_cast<Tree*>(node);
else if (!p.empty()) {
MTPE("path element of %s is not a directory: %s node: %p\n", path.c_str(), e.c_str(), node);
return NULL;
}
}
MTPD("findNodeByPath: found node %p, handle: %u, name: %s\n", node, node->Mtpid(), node->getName().c_str());
return node;
}
Node* MtpStorage::addNewNode(bool isDir, Tree* tree, const std::string& name)
{
// global counter for new object handles
static MtpObjectHandle mtpid = 0;
++mtpid;
MTPD("adding new %s node for %s, new handle: %u\n", isDir ? "dir" : "file", name.c_str(), mtpid);
MtpObjectHandle parent = tree->Mtpid();
MTPD("parent tree: %x, handle: %u, name: %s\n", tree, parent, tree->getName().c_str());
Node* node;
if (isDir)
node = mtpmap[mtpid] = new Tree(mtpid, parent, name);
else
node = new Node(mtpid, parent, name);
tree->addEntry(node);
return node;
}
Node* MtpStorage::findNode(MtpObjectHandle handle) {
for (iter i = mtpmap.begin(); i != mtpmap.end(); i++) {
Node* node = i->second->findNode(handle);
if (node != NULL) {
MTPD("findNode: found node %p for handle %u, name: %s\n", node, handle, node->getName().c_str());
if (node->Mtpid() != handle)
{
MTPE("BUG: entry for handle %u points to node with handle %u\n", handle, node->Mtpid());
}
return node;
}
}
// Item is not on this storage device
MTPE("MtpStorage::findNode: no node found for handle %u, searched %u trees\n", handle, mtpmap.size());
return NULL;
}
std::string MtpStorage::getNodePath(Node* node) {
std::string path;
MTPD("getNodePath: node %p, handle %u\n", node, node->Mtpid());
while (node)
{
path = "/" + node->getName() + path;
MtpObjectHandle parent = node->getMtpParentId();
if (parent == 0) // root
break;
node = findNode(parent);
}
path = mtpstorageparent + path;
MTPD("getNodePath: path %s\n", path.c_str());
return path;
}
void MtpStorage::lockMutex(int thread_type) {
if (!use_mutex)
return; // mutex is disabled
if (thread_type) {
// inotify thread
pthread_mutex_lock(&inMutex);
while (pthread_mutex_trylock(&mtpMutex)) {
pthread_mutex_unlock(&inMutex);
usleep(32000);
pthread_mutex_lock(&inMutex);
}
} else {
// main mtp thread
pthread_mutex_lock(&mtpMutex);
while (pthread_mutex_trylock(&inMutex)) {
pthread_mutex_unlock(&mtpMutex);
usleep(13000);
pthread_mutex_lock(&mtpMutex);
}
}
}
void MtpStorage::unlockMutex(int thread_type) {
if (!use_mutex)
return; // mutex is disabled
pthread_mutex_unlock(&inMutex);
pthread_mutex_unlock(&mtpMutex);
}
