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Diffstat (limited to 'mtp/MtpDevice.cpp')
| -rw-r--r-- | mtp/MtpDevice.cpp | 833 |
1 files changed, 833 insertions, 0 deletions
diff --git a/mtp/MtpDevice.cpp b/mtp/MtpDevice.cpp new file mode 100644 index 000000000..53f8b2e9f --- /dev/null +++ b/mtp/MtpDevice.cpp @@ -0,0 +1,833 @@ +/* + * 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 "MtpDevice.h" +#include "MtpDebug.h" +#include "MtpDeviceInfo.h" +#include "MtpObjectInfo.h" +#include "MtpProperty.h" +#include "MtpStorageInfo.h" +#include "MtpStringBuffer.h" +#include "MtpUtils.h" +#include "MtpDataPacket.h" + +#include <stdio.h> +#include <stdlib.h> +#include <sys/types.h> +#include <sys/ioctl.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <errno.h> +#include <endian.h> + +#include <usbhost/usbhost.h> + + +#if 0 +static bool isMtpDevice(uint16_t vendor, uint16_t product) { + // Sandisk Sansa Fuze + if (vendor == 0x0781 && product == 0x74c2) + return true; + // Samsung YP-Z5 + if (vendor == 0x04e8 && product == 0x503c) + return true; + return false; +} +#endif + +MtpDevice* MtpDevice::open(const char* deviceName, int fd) { + struct usb_device *device = usb_device_new(deviceName, fd); + if (!device) { + MTPE("usb_device_new failed for %s", deviceName); + return NULL; + } + + struct usb_descriptor_header* desc; + struct usb_descriptor_iter iter; + + usb_descriptor_iter_init(device, &iter); + + while ((desc = usb_descriptor_iter_next(&iter)) != NULL) { + if (desc->bDescriptorType == USB_DT_INTERFACE) { + struct usb_interface_descriptor *interface = (struct usb_interface_descriptor *)desc; + + if (interface->bInterfaceClass == USB_CLASS_STILL_IMAGE && + interface->bInterfaceSubClass == 1 && // Still Image Capture + interface->bInterfaceProtocol == 1) // Picture Transfer Protocol (PIMA 15470) + { + char* manufacturerName = usb_device_get_manufacturer_name(device); + char* productName = usb_device_get_product_name(device); + MTPD("Found camera: \"%s\" \"%s\"\n", manufacturerName, productName); + free(manufacturerName); + free(productName); + } else if (interface->bInterfaceClass == 0xFF && + interface->bInterfaceSubClass == 0xFF && + interface->bInterfaceProtocol == 0) { + char* interfaceName = usb_device_get_string(device, interface->iInterface); + if (!interfaceName) { + continue; + } else if (strcmp(interfaceName, "MTP")) { + free(interfaceName); + continue; + } + free(interfaceName); + + // Looks like an android style MTP device + char* manufacturerName = usb_device_get_manufacturer_name(device); + char* productName = usb_device_get_product_name(device); + MTPI("Found MTP device: \"%s\" \"%s\"\n", manufacturerName, productName); + free(manufacturerName); + free(productName); + } +#if 0 + else { + // look for special cased devices based on vendor/product ID + // we are doing this mainly for testing purposes + uint16_t vendor = usb_device_get_vendor_id(device); + uint16_t product = usb_device_get_product_id(device); + if (!isMtpDevice(vendor, product)) { + // not an MTP or PTP device + continue; + } + // request MTP OS string and descriptor + // some music players need to see this before entering MTP mode. + char buffer[256]; + memset(buffer, 0, sizeof(buffer)); + int ret = usb_device_control_transfer(device, + USB_DIR_IN|USB_RECIP_DEVICE|USB_TYPE_STANDARD, + USB_REQ_GET_DESCRIPTOR, (USB_DT_STRING << 8) | 0xEE, + 0, buffer, sizeof(buffer), 0); + MTPE("usb_device_control_transfer returned %d errno: %d\n", ret, errno); + if (ret > 0) { + MTPI("got MTP string %s\n", buffer); + ret = usb_device_control_transfer(device, + USB_DIR_IN|USB_RECIP_DEVICE|USB_TYPE_VENDOR, 1, + 0, 4, buffer, sizeof(buffer), 0); + MTPI("OS descriptor got %d\n", ret); + } else { + MTPI("no MTP string\n"); + } + } +#endif + // if we got here, then we have a likely MTP or PTP device + + // interface should be followed by three endpoints + struct usb_endpoint_descriptor *ep; + struct usb_endpoint_descriptor *ep_in_desc = NULL; + struct usb_endpoint_descriptor *ep_out_desc = NULL; + struct usb_endpoint_descriptor *ep_intr_desc = NULL; + for (int i = 0; i < 3; i++) { + ep = (struct usb_endpoint_descriptor *)usb_descriptor_iter_next(&iter); + if (!ep || ep->bDescriptorType != USB_DT_ENDPOINT) { + MTPE("endpoints not found\n"); + usb_device_close(device); + return NULL; + } + if (ep->bmAttributes == USB_ENDPOINT_XFER_BULK) { + if (ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK) + ep_in_desc = ep; + else + ep_out_desc = ep; + } else if (ep->bmAttributes == USB_ENDPOINT_XFER_INT && + ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK) { + ep_intr_desc = ep; + } + } + if (!ep_in_desc || !ep_out_desc || !ep_intr_desc) { + MTPE("endpoints not found\n"); + usb_device_close(device); + return NULL; + } + + if (usb_device_claim_interface(device, interface->bInterfaceNumber)) { + MTPE("usb_device_claim_interface failed errno: %d\n", errno); + usb_device_close(device); + return NULL; + } + + MtpDevice* mtpDevice = new MtpDevice(device, interface->bInterfaceNumber, + ep_in_desc, ep_out_desc, ep_intr_desc); + mtpDevice->initialize(); + return mtpDevice; + } + } + + usb_device_close(device); + MTPE("device not found"); + return NULL; +} + +MtpDevice::MtpDevice(struct usb_device* device, int interface, + const struct usb_endpoint_descriptor *ep_in, + const struct usb_endpoint_descriptor *ep_out, + const struct usb_endpoint_descriptor *ep_intr) + : mDevice(device), + mInterface(interface), + mRequestIn1(NULL), + mRequestIn2(NULL), + mRequestOut(NULL), + mRequestIntr(NULL), + mDeviceInfo(NULL), + mSessionID(0), + mTransactionID(0), + mReceivedResponse(false) +{ + mRequestIn1 = usb_request_new(device, ep_in); + mRequestIn2 = usb_request_new(device, ep_in); + mRequestOut = usb_request_new(device, ep_out); + mRequestIntr = usb_request_new(device, ep_intr); +} + +MtpDevice::~MtpDevice() { + close(); + for (size_t i = 0; i < mDeviceProperties.size(); i++) + delete mDeviceProperties[i]; + usb_request_free(mRequestIn1); + usb_request_free(mRequestIn2); + usb_request_free(mRequestOut); + usb_request_free(mRequestIntr); +} + +void MtpDevice::initialize() { + openSession(); + mDeviceInfo = getDeviceInfo(); + if (mDeviceInfo) { + if (mDeviceInfo->mDeviceProperties) { + int count = mDeviceInfo->mDeviceProperties->size(); + for (int i = 0; i < count; i++) { + MtpDeviceProperty propCode = (*mDeviceInfo->mDeviceProperties)[i]; + MtpProperty* property = getDevicePropDesc(propCode); + if (property) + mDeviceProperties.push(property); + } + } + } +} + +void MtpDevice::close() { + if (mDevice) { + usb_device_release_interface(mDevice, mInterface); + usb_device_close(mDevice); + mDevice = NULL; + } +} + +void MtpDevice::print() { + if (mDeviceInfo) { + mDeviceInfo->print(); + + if (mDeviceInfo->mDeviceProperties) { + MTPI("***** DEVICE PROPERTIES *****\n"); + int count = mDeviceInfo->mDeviceProperties->size(); + for (int i = 0; i < count; i++) { + MtpDeviceProperty propCode = (*mDeviceInfo->mDeviceProperties)[i]; + MtpProperty* property = getDevicePropDesc(propCode); + if (property) { + property->print(); + delete property; + } + } + } + } + + if (mDeviceInfo->mPlaybackFormats) { + MTPI("***** OBJECT PROPERTIES *****\n"); + int count = mDeviceInfo->mPlaybackFormats->size(); + for (int i = 0; i < count; i++) { + MtpObjectFormat format = (*mDeviceInfo->mPlaybackFormats)[i]; + MTPI("*** FORMAT: %s\n", MtpDebug::getFormatCodeName(format)); + MtpObjectPropertyList* props = getObjectPropsSupported(format); + if (props) { + for (size_t j = 0; j < props->size(); j++) { + MtpObjectProperty prop = (*props)[j]; + MtpProperty* property = getObjectPropDesc(prop, format); + if (property) { + property->print(); + delete property; + } else { + MTPI("could not fetch property: %s", + MtpDebug::getObjectPropCodeName(prop)); + } + } + } + } + } +} + +const char* MtpDevice::getDeviceName() { + if (mDevice) + return usb_device_get_name(mDevice); + else + return "???"; +} + +bool MtpDevice::openSession() { + android::Mutex::Autolock autoLock(mMutex); + + mSessionID = 0; + mTransactionID = 0; + MtpSessionID newSession = 1; + mRequest.reset(); + mRequest.setParameter(1, newSession); + if (!sendRequest(MTP_OPERATION_OPEN_SESSION)) + return false; + MtpResponseCode ret = readResponse(); + if (ret == MTP_RESPONSE_SESSION_ALREADY_OPEN) + newSession = mResponse.getParameter(1); + else if (ret != MTP_RESPONSE_OK) + return false; + + mSessionID = newSession; + mTransactionID = 1; + return true; +} + +bool MtpDevice::closeSession() { + // FIXME + return true; +} + +MtpDeviceInfo* MtpDevice::getDeviceInfo() { + android::Mutex::Autolock autoLock(mMutex); + + mRequest.reset(); + if (!sendRequest(MTP_OPERATION_GET_DEVICE_INFO)) + return NULL; + if (!readData()) + return NULL; + MtpResponseCode ret = readResponse(); + if (ret == MTP_RESPONSE_OK) { + MtpDeviceInfo* info = new MtpDeviceInfo; + info->read(mData); + return info; + } + return NULL; +} + +MtpStorageIDList* MtpDevice::getStorageIDs() { + android::Mutex::Autolock autoLock(mMutex); + + mRequest.reset(); + if (!sendRequest(MTP_OPERATION_GET_STORAGE_IDS)) + return NULL; + if (!readData()) + return NULL; + MtpResponseCode ret = readResponse(); + if (ret == MTP_RESPONSE_OK) { + return mData.getAUInt32(); + } + return NULL; +} + +MtpStorageInfo* MtpDevice::getStorageInfo(MtpStorageID storageID) { + android::Mutex::Autolock autoLock(mMutex); + + mRequest.reset(); + mRequest.setParameter(1, storageID); + if (!sendRequest(MTP_OPERATION_GET_STORAGE_INFO)) + return NULL; + if (!readData()) + return NULL; + MtpResponseCode ret = readResponse(); + if (ret == MTP_RESPONSE_OK) { + MtpStorageInfo* info = new MtpStorageInfo(storageID); + info->read(mData); + return info; + } + return NULL; +} + +MtpObjectHandleList* MtpDevice::getObjectHandles(MtpStorageID storageID, + MtpObjectFormat format, MtpObjectHandle parent) { + android::Mutex::Autolock autoLock(mMutex); + + mRequest.reset(); + mRequest.setParameter(1, storageID); + mRequest.setParameter(2, format); + mRequest.setParameter(3, parent); + if (!sendRequest(MTP_OPERATION_GET_OBJECT_HANDLES)) + return NULL; + if (!readData()) + return NULL; + MtpResponseCode ret = readResponse(); + if (ret == MTP_RESPONSE_OK) { + return mData.getAUInt32(); + } + return NULL; +} + +MtpObjectInfo* MtpDevice::getObjectInfo(MtpObjectHandle handle) { + android::Mutex::Autolock autoLock(mMutex); + + // FIXME - we might want to add some caching here + + mRequest.reset(); + mRequest.setParameter(1, handle); + if (!sendRequest(MTP_OPERATION_GET_OBJECT_INFO)) + return NULL; + if (!readData()) + return NULL; + MtpResponseCode ret = readResponse(); + if (ret == MTP_RESPONSE_OK) { + MtpObjectInfo* info = new MtpObjectInfo(handle); + info->read(mData); + return info; + } + return NULL; +} + +void* MtpDevice::getThumbnail(MtpObjectHandle handle, int& outLength) { + android::Mutex::Autolock autoLock(mMutex); + + mRequest.reset(); + mRequest.setParameter(1, handle); + if (sendRequest(MTP_OPERATION_GET_THUMB) && readData()) { + MtpResponseCode ret = readResponse(); + if (ret == MTP_RESPONSE_OK) { + return mData.getData(outLength); + } + } + outLength = 0; + return NULL; +} + +MtpObjectHandle MtpDevice::sendObjectInfo(MtpObjectInfo* info) { + android::Mutex::Autolock autoLock(mMutex); + + mRequest.reset(); + MtpObjectHandle parent = info->mParent; + if (parent == 0) + parent = MTP_PARENT_ROOT; + + mRequest.setParameter(1, info->mStorageID); + mRequest.setParameter(2, info->mParent); + + mData.putUInt32(info->mStorageID); + mData.putUInt16(info->mFormat); + mData.putUInt16(info->mProtectionStatus); + mData.putUInt32(info->mCompressedSize); + mData.putUInt16(info->mThumbFormat); + mData.putUInt32(info->mThumbCompressedSize); + mData.putUInt32(info->mThumbPixWidth); + mData.putUInt32(info->mThumbPixHeight); + mData.putUInt32(info->mImagePixWidth); + mData.putUInt32(info->mImagePixHeight); + mData.putUInt32(info->mImagePixDepth); + mData.putUInt32(info->mParent); + mData.putUInt16(info->mAssociationType); + mData.putUInt32(info->mAssociationDesc); + mData.putUInt32(info->mSequenceNumber); + mData.putString(info->mName); + + char created[100], modified[100]; + formatDateTime(info->mDateCreated, created, sizeof(created)); + formatDateTime(info->mDateModified, modified, sizeof(modified)); + + mData.putString(created); + mData.putString(modified); + if (info->mKeywords) + mData.putString(info->mKeywords); + else + mData.putEmptyString(); + + if (sendRequest(MTP_OPERATION_SEND_OBJECT_INFO) && sendData()) { + MtpResponseCode ret = readResponse(); + if (ret == MTP_RESPONSE_OK) { + info->mStorageID = mResponse.getParameter(1); + info->mParent = mResponse.getParameter(2); + info->mHandle = mResponse.getParameter(3); + return info->mHandle; + } + } + return (MtpObjectHandle)-1; +} + +bool MtpDevice::sendObject(MtpObjectInfo* info, int srcFD) { + android::Mutex::Autolock autoLock(mMutex); + + int remaining = info->mCompressedSize; + mRequest.reset(); + mRequest.setParameter(1, info->mHandle); + if (sendRequest(MTP_OPERATION_SEND_OBJECT)) { + // send data header + writeDataHeader(MTP_OPERATION_SEND_OBJECT, remaining); + + char buffer[65536]; + while (remaining > 0) { + int count = read(srcFD, buffer, sizeof(buffer)); + if (count > 0) { + int written = mData.write(mRequestOut, buffer, count); + // FIXME check error + remaining -= count; + } else { + break; + } + } + } + MtpResponseCode ret = readResponse(); + return (remaining == 0 && ret == MTP_RESPONSE_OK); +} + +bool MtpDevice::deleteObject(MtpObjectHandle handle) { + android::Mutex::Autolock autoLock(mMutex); + + mRequest.reset(); + mRequest.setParameter(1, handle); + if (sendRequest(MTP_OPERATION_DELETE_OBJECT)) { + MtpResponseCode ret = readResponse(); + if (ret == MTP_RESPONSE_OK) + return true; + } + return false; +} + +MtpObjectHandle MtpDevice::getParent(MtpObjectHandle handle) { + MtpObjectInfo* info = getObjectInfo(handle); + if (info) { + MtpObjectHandle parent = info->mParent; + delete info; + return parent; + } else { + return -1; + } +} + +MtpObjectHandle MtpDevice::getStorageID(MtpObjectHandle handle) { + MtpObjectInfo* info = getObjectInfo(handle); + if (info) { + MtpObjectHandle storageId = info->mStorageID; + delete info; + return storageId; + } else { + return -1; + } +} + +MtpObjectPropertyList* MtpDevice::getObjectPropsSupported(MtpObjectFormat format) { + android::Mutex::Autolock autoLock(mMutex); + + mRequest.reset(); + mRequest.setParameter(1, format); + if (!sendRequest(MTP_OPERATION_GET_OBJECT_PROPS_SUPPORTED)) + return NULL; + if (!readData()) + return NULL; + MtpResponseCode ret = readResponse(); + if (ret == MTP_RESPONSE_OK) { + return mData.getAUInt16(); + } + return NULL; + +} + +MtpProperty* MtpDevice::getDevicePropDesc(MtpDeviceProperty code) { + android::Mutex::Autolock autoLock(mMutex); + + mRequest.reset(); + mRequest.setParameter(1, code); + if (!sendRequest(MTP_OPERATION_GET_DEVICE_PROP_DESC)) + return NULL; + if (!readData()) + return NULL; + MtpResponseCode ret = readResponse(); + if (ret == MTP_RESPONSE_OK) { + MtpProperty* property = new MtpProperty; + property->read(mData); + return property; + } + return NULL; +} + +MtpProperty* MtpDevice::getObjectPropDesc(MtpObjectProperty code, MtpObjectFormat format) { + android::Mutex::Autolock autoLock(mMutex); + + mRequest.reset(); + mRequest.setParameter(1, code); + mRequest.setParameter(2, format); + if (!sendRequest(MTP_OPERATION_GET_OBJECT_PROP_DESC)) + return NULL; + if (!readData()) + return NULL; + MtpResponseCode ret = readResponse(); + if (ret == MTP_RESPONSE_OK) { + MtpProperty* property = new MtpProperty; + property->read(mData); + return property; + } + return NULL; +} + +bool MtpDevice::readObject(MtpObjectHandle handle, + bool (* callback)(void* data, int offset, int length, void* clientData), + int objectSize, void* clientData) { + android::Mutex::Autolock autoLock(mMutex); + bool result = false; + + mRequest.reset(); + mRequest.setParameter(1, handle); + if (sendRequest(MTP_OPERATION_GET_OBJECT) + && mData.readDataHeader(mRequestIn1)) { + uint32_t length = mData.getContainerLength(); + if ((int)length - MTP_CONTAINER_HEADER_SIZE != objectSize) { + MTPE("readObject error objectSize: %d, length: %d", + objectSize, length); + goto fail; + } + length -= MTP_CONTAINER_HEADER_SIZE; + uint32_t remaining = length; + int offset = 0; + + int initialDataLength = 0; + void* initialData = mData.getData(initialDataLength); + if (initialData) { + if (initialDataLength > 0) { + if (!callback(initialData, 0, initialDataLength, clientData)) + goto fail; + remaining -= initialDataLength; + offset += initialDataLength; + } + free(initialData); + } + + // USB reads greater than 16K don't work + char buffer1[16384], buffer2[16384]; + mRequestIn1->buffer = buffer1; + mRequestIn2->buffer = buffer2; + struct usb_request* req = mRequestIn1; + void* writeBuffer = NULL; + int writeLength = 0; + + while (remaining > 0 || writeBuffer) { + if (remaining > 0) { + // queue up a read request + req->buffer_length = (remaining > sizeof(buffer1) ? sizeof(buffer1) : remaining); + if (mData.readDataAsync(req)) { + MTPE("readDataAsync failed"); + goto fail; + } + } else { + req = NULL; + } + + if (writeBuffer) { + // write previous buffer + if (!callback(writeBuffer, offset, writeLength, clientData)) { + MTPE("write failed"); + // wait for pending read before failing + if (req) + mData.readDataWait(mDevice); + goto fail; + } + offset += writeLength; + writeBuffer = NULL; + } + + // wait for read to complete + if (req) { + int read = mData.readDataWait(mDevice); + if (read < 0) + goto fail; + + if (read > 0) { + writeBuffer = req->buffer; + writeLength = read; + remaining -= read; + req = (req == mRequestIn1 ? mRequestIn2 : mRequestIn1); + } else { + writeBuffer = NULL; + } + } + } + + MtpResponseCode response = readResponse(); + if (response == MTP_RESPONSE_OK) + result = true; + } + +fail: + return result; +} + + +// reads the object's data and writes it to the specified file path +bool MtpDevice::readObject(MtpObjectHandle handle, const char* destPath, int group, int perm) { + MTPI("readObject: %s", destPath); + int fd = ::open(destPath, O_RDWR | O_CREAT | O_TRUNC, 0640); + if (fd < 0) { + MTPE("open failed for %s", destPath); + return false; + } + + fchown(fd, getuid(), group); + // set permissions + int mask = umask(0); + fchmod(fd, perm); + umask(mask); + + android::Mutex::Autolock autoLock(mMutex); + bool result = false; + + mRequest.reset(); + mRequest.setParameter(1, handle); + if (sendRequest(MTP_OPERATION_GET_OBJECT) + && mData.readDataHeader(mRequestIn1)) { + uint32_t length = mData.getContainerLength(); + if (length < MTP_CONTAINER_HEADER_SIZE) + goto fail; + length -= MTP_CONTAINER_HEADER_SIZE; + uint32_t remaining = length; + + int initialDataLength = 0; + void* initialData = mData.getData(initialDataLength); + if (initialData) { + if (initialDataLength > 0) { + if (write(fd, initialData, initialDataLength) != initialDataLength) { + free(initialData); + goto fail; + } + remaining -= initialDataLength; + } + free(initialData); + } + + // USB reads greater than 16K don't work + char buffer1[16384], buffer2[16384]; + mRequestIn1->buffer = buffer1; + mRequestIn2->buffer = buffer2; + struct usb_request* req = mRequestIn1; + void* writeBuffer = NULL; + int writeLength = 0; + + while (remaining > 0 || writeBuffer) { + if (remaining > 0) { + // queue up a read request + req->buffer_length = (remaining > sizeof(buffer1) ? sizeof(buffer1) : remaining); + if (mData.readDataAsync(req)) { + MTPE("readDataAsync failed"); + goto fail; + } + } else { + req = NULL; + } + + if (writeBuffer) { + // write previous buffer + if (write(fd, writeBuffer, writeLength) != writeLength) { + MTPE("write failed"); + // wait for pending read before failing + if (req) + mData.readDataWait(mDevice); + goto fail; + } + writeBuffer = NULL; + } + + // wait for read to complete + if (req) { + int read = mData.readDataWait(mDevice); + if (read < 0) + goto fail; + + if (read > 0) { + writeBuffer = req->buffer; + writeLength = read; + remaining -= read; + req = (req == mRequestIn1 ? mRequestIn2 : mRequestIn1); + } else { + writeBuffer = NULL; + } + } + } + + MtpResponseCode response = readResponse(); + if (response == MTP_RESPONSE_OK) + result = true; + } + +fail: + ::close(fd); + return result; +} + +bool MtpDevice::sendRequest(MtpOperationCode operation) { + MTPD("sendRequest: %s\n", MtpDebug::getOperationCodeName(operation)); + mReceivedResponse = false; + mRequest.setOperationCode(operation); + if (mTransactionID > 0) + mRequest.setTransactionID(mTransactionID++); + int ret = mRequest.write(mRequestOut); + mRequest.dump(); + return (ret > 0); +} + +bool MtpDevice::sendData() { + MTPD("sendData\n"); + mData.setOperationCode(mRequest.getOperationCode()); + mData.setTransactionID(mRequest.getTransactionID()); + int ret = mData.write(mRequestOut); + mData.dump(); + return (ret > 0); +} + +bool MtpDevice::readData() { + mData.reset(); + int ret = mData.read(mRequestIn1); + MTPD("readData returned %d\n", ret); + if (ret >= MTP_CONTAINER_HEADER_SIZE) { + if (mData.getContainerType() == MTP_CONTAINER_TYPE_RESPONSE) { + MTPD("got response packet instead of data packet"); + // we got a response packet rather than data + // copy it to mResponse + mResponse.copyFrom(mData); + mReceivedResponse = true; + return false; + } + mData.dump(); + return true; + } + else { + MTPE("readResponse failed\n"); + return false; + } +} + +bool MtpDevice::writeDataHeader(MtpOperationCode operation, int dataLength) { + mData.setOperationCode(operation); + mData.setTransactionID(mRequest.getTransactionID()); + return (!mData.writeDataHeader(mRequestOut, dataLength)); +} + +MtpResponseCode MtpDevice::readResponse() { + MTPD("readResponse\n"); + if (mReceivedResponse) { + mReceivedResponse = false; + return mResponse.getResponseCode(); + } + int ret = mResponse.read(mRequestIn1); + // handle zero length packets, which might occur if the data transfer + // ends on a packet boundary + if (ret == 0) + ret = mResponse.read(mRequestIn1); + if (ret >= MTP_CONTAINER_HEADER_SIZE) { + mResponse.dump(); + return mResponse.getResponseCode(); + } else { + MTPE("readResponse failed\n"); + return -1; + } +} |