Checkpoint work on MTP and PTP investigation.

This change includes work in progress on a C++ library for both host and device
MTP and PTP support.
Currently the makefile builds two test programs:

mtptest - a command line test program that implements a small subset of device side MTP.
Requires a kernel driver that has not been checked in yet.

ptptest - a host tool to test USB host support for detecting and communicating with
digital cameras over PTP.  Runs on Linux host.

Later this will be reformulated as a native library that will be used in the media process.

Change-Id: I81aab279975b600b59d99013ab97f9adf0b58da7
Signed-off-by: Mike Lockwood <lockwood@android.com>

1 files changed, 135 insertions, 0 deletions

diff --git a/media/mtp/MtpStorage.cpp b/media/mtp/MtpStorage.cpp
new file mode 100644
index 0000000..bbdef51
--- /dev/null
+++ b/media/mtp/MtpStorage.cpp
@@ -0,0 +1,135 @@
+/*
+ * 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.
+ */
+
+#include "MtpDatabase.h"
+#include "MtpStorage.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>
+
+
+MtpStorage::MtpStorage(MtpStorageID id, const char* filePath, MtpDatabase* db)
+    :   mStorageID(id),
+        mFilePath(filePath),
+        mDatabase(db),
+        mMaxCapacity(0)
+{
+}
+
+MtpStorage::~MtpStorage() {
+}
+
+int MtpStorage::getType() const {
+    return 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(mFilePath, &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(mFilePath, &stat))
+        return -1;
+    return (uint64_t)stat.f_bavail * (uint64_t)stat.f_bsize;
+}
+
+const char* MtpStorage::getDescription() const {
+    return "Phone Storage";
+}
+
+bool MtpStorage::scanFiles() {
+    mDatabase->beginTransaction();
+    int ret = scanDirectory(mFilePath, MTP_PARENT_ROOT);
+    mDatabase->commitTransaction();
+    return (ret == 0);
+}
+
+int MtpStorage::scanDirectory(const char* path, MtpObjectHandle parent)
+{
+    char buffer[PATH_MAX];
+    struct dirent* entry;
+
+    int length = strlen(path);
+    if (length > sizeof(buffer) + 2) {
+        fprintf(stderr, "path too long: %s\n", path);
+    }
+
+    DIR* dir = opendir(path);
+    if (!dir) {
+        fprintf(stderr, "opendir %s failed, errno: %d", path, errno);
+        return -1;
+    }
+
+    strncpy(buffer, path, sizeof(buffer));
+    char* fileStart = buffer + length;
+    // make sure we have a trailing slash
+    if (fileStart[-1] != '/') {
+        *(fileStart++) = '/';
+    }
+    int fileNameLength = sizeof(buffer) + fileStart - buffer;
+
+    while ((entry = readdir(dir))) {
+        const char* name = entry->d_name;
+
+        // ignore "." and "..", as well as any files or directories staring with dot
+        if (name[0] == '.') {
+            continue;
+        }
+        if (strlen(name) + 1 > fileNameLength) {
+            fprintf(stderr, "path too long for %s\n", name);
+            continue;
+        }
+        strcpy(fileStart, name);
+
+        struct stat statbuf;
+        memset(&statbuf, 0, sizeof(statbuf));
+        stat(buffer, &statbuf);
+
+        if (entry->d_type == DT_DIR) {
+            MtpObjectHandle handle = mDatabase->addFile(buffer, MTP_FORMAT_ASSOCIATION,
+                    parent, mStorageID, 0, 0, statbuf.st_mtime);
+            scanDirectory(buffer, handle);
+        } else if (entry->d_type == DT_REG) {
+            mDatabase->addFile(buffer, MTP_FORMAT_UNDEFINED, parent, mStorageID,
+                    statbuf.st_size, 0, statbuf.st_mtime);
+        }
+    }
+
+    closedir(dir);
+    return 0;
+}