MTP: host support for retrieving device property descriptors

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

1 files changed, 161 insertions, 0 deletions

diff --git a/media/mtp/MtpProperty.cpp b/media/mtp/MtpProperty.cpp
new file mode 100644
index 0000000..65ce4d4
--- /dev/null
+++ b/media/mtp/MtpProperty.cpp
@@ -0,0 +1,161 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "MtpProperty"
+#include "utils/Log.h"
+
+#include "MtpDataPacket.h"
+#include "MtpProperty.h"
+#include "MtpStringBuffer.h"
+#include "MtpUtils.h"
+
+namespace android {
+
+MtpProperty::MtpProperty()
+    :   mCode(0),
+        mType(0),
+        mWriteable(false),
+        mDefaultArrayLength(0),
+        mDefaultArrayValues(NULL),
+        mCurrentArrayLength(0),
+        mCurrentArrayValues(NULL),
+        mFormFlag(kFormNone),
+        mEnumLength(0),
+        mEnumValues(NULL)
+{
+    mDefaultValue.str = NULL;
+    mCurrentValue.str = NULL;
+    mMinimumValue.str = NULL;
+    mMaximumValue.str = NULL;
+}
+
+MtpProperty::~MtpProperty() {
+    if (mType == MTP_TYPE_STR) {
+        // free all strings
+        free(mDefaultValue.str);
+        free(mCurrentValue.str);
+        free(mMinimumValue.str);
+        free(mMaximumValue.str);
+        if (mDefaultArrayValues) {
+            for (int i = 0; i < mDefaultArrayLength; i++)
+                free(mDefaultArrayValues[i].str);
+        }
+        if (mCurrentArrayValues) {
+            for (int i = 0; i < mCurrentArrayLength; i++)
+                free(mCurrentArrayValues[i].str);
+        }
+        if (mEnumValues) {
+            for (int i = 0; i < mEnumLength; i++)
+                free(mEnumValues[i].str);
+        }
+    }
+    delete[] mDefaultArrayValues;
+    delete[] mCurrentArrayValues;
+    delete[] mEnumValues;
+}
+
+void MtpProperty::read(MtpDataPacket& packet) {
+    MtpStringBuffer string;
+
+    mCode = packet.getUInt16();
+    mType = packet.getUInt16();
+    mWriteable = (packet.getUInt8() == 1);
+    switch (mType) {
+        case MTP_TYPE_AINT8:
+        case MTP_TYPE_AUINT8:
+        case MTP_TYPE_AINT16:
+        case MTP_TYPE_AUINT16:
+        case MTP_TYPE_AINT32:
+        case MTP_TYPE_AUINT32:
+        case MTP_TYPE_AINT64:
+        case MTP_TYPE_AUINT64:
+        case MTP_TYPE_AINT128:
+        case MTP_TYPE_AUINT128:
+            mDefaultArrayValues = readArrayValues(packet, mDefaultArrayLength);
+            mCurrentArrayValues = readArrayValues(packet, mCurrentArrayLength);
+            break;
+        default:
+            readValue(packet, mDefaultValue);
+            readValue(packet, mCurrentValue);
+    }
+    mFormFlag = packet.getUInt8();
+
+    if (mFormFlag == kFormRange) {
+            readValue(packet, mMinimumValue);
+            readValue(packet, mMaximumValue);
+            readValue(packet, mStepSize);
+    } else if (mFormFlag == kFormEnum) {
+        mEnumLength = packet.getUInt16();
+        mEnumValues = new MtpPropertyValue[mEnumLength];
+        for (int i = 0; i < mEnumLength; i++)
+            readValue(packet, mEnumValues[i]);
+    }
+}
+
+void MtpProperty::print() {
+    LOGD("MtpProperty %04X\n", mCode);
+    LOGD("    type %04X\n", mType);
+    LOGD("    writeable %s\n", (mWriteable ? "true" : "false"));
+}
+
+void MtpProperty::readValue(MtpDataPacket& packet, MtpPropertyValue& value) {
+    switch (mType) {
+        case MTP_TYPE_INT8:
+            value.i8 = packet.getInt8();
+            break;
+        case MTP_TYPE_UINT8:
+            value.u8 = packet.getUInt8();
+            break;
+        case MTP_TYPE_INT16:
+            value.i16 = packet.getInt16();
+            break;
+        case MTP_TYPE_UINT16:
+            value.u16 = packet.getUInt16();
+            break;
+        case MTP_TYPE_INT32:
+            value.i32 = packet.getInt32();
+            break;
+        case MTP_TYPE_UINT32:
+            value.u32 = packet.getUInt32();
+            break;
+        case MTP_TYPE_INT64:
+            value.i64 = packet.getInt64();
+            break;
+        case MTP_TYPE_UINT64:
+            value.u64 = packet.getUInt64();
+            break;
+        case MTP_TYPE_INT128:
+            packet.getInt128(value.i128);
+            break;
+        case MTP_TYPE_UINT128:
+            packet.getUInt128(value.u128);
+            break;
+        default:
+            fprintf(stderr, "unknown type %d in MtpProperty::readValue\n", mType);
+    }
+}
+
+MtpPropertyValue* MtpProperty::readArrayValues(MtpDataPacket& packet, int& length) {
+    length = packet.getUInt32();
+    if (length == 0)
+        return NULL;
+    MtpPropertyValue* result = new MtpPropertyValue[length];
+    for (int i = 0; i < length; i++)
+        readValue(packet, result[i]);
+    return result;
+}
+
+}  // namespace android