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654 lines
19 KiB
654 lines
19 KiB
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "MtpDataPacket"
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#include "MtpDataPacket.h"
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#include <algorithm>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <usbhost/usbhost.h>
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#include "MtpStringBuffer.h"
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#include "IMtpHandle.h"
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namespace android {
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namespace {
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// Reads the exact |count| bytes from |fd| to |buf|.
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// Returns |count| if it succeed to read the bytes. Otherwise returns -1. If it reaches EOF, the
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// function regards it as an error.
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ssize_t readExactBytes(int fd, void* buf, size_t count) {
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if (count > SSIZE_MAX) {
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return -1;
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}
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size_t read_count = 0;
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while (read_count < count) {
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int result = read(fd, static_cast<int8_t*>(buf) + read_count, count - read_count);
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// Assume that EOF is error.
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if (result <= 0) {
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return -1;
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}
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read_count += result;
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}
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return read_count == count ? count : -1;
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}
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} // namespace
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MtpDataPacket::MtpDataPacket()
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: MtpPacket(MTP_BUFFER_SIZE), // MAX_USBFS_BUFFER_SIZE
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mOffset(MTP_CONTAINER_HEADER_SIZE)
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{
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}
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MtpDataPacket::~MtpDataPacket() {
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}
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void MtpDataPacket::reset() {
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MtpPacket::reset();
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mOffset = MTP_CONTAINER_HEADER_SIZE;
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}
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void MtpDataPacket::setOperationCode(MtpOperationCode code) {
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MtpPacket::putUInt16(MTP_CONTAINER_CODE_OFFSET, code);
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}
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void MtpDataPacket::setTransactionID(MtpTransactionID id) {
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MtpPacket::putUInt32(MTP_CONTAINER_TRANSACTION_ID_OFFSET, id);
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}
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bool MtpDataPacket::getUInt8(uint8_t& value) {
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if (mPacketSize - mOffset < sizeof(value))
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return false;
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value = mBuffer[mOffset++];
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return true;
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}
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bool MtpDataPacket::getUInt16(uint16_t& value) {
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if (mPacketSize - mOffset < sizeof(value))
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return false;
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int offset = mOffset;
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value = (uint16_t)mBuffer[offset] | ((uint16_t)mBuffer[offset + 1] << 8);
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mOffset += sizeof(value);
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return true;
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}
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bool MtpDataPacket::getUInt32(uint32_t& value) {
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if (mPacketSize - mOffset < sizeof(value))
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return false;
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int offset = mOffset;
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value = (uint32_t)mBuffer[offset] | ((uint32_t)mBuffer[offset + 1] << 8) |
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((uint32_t)mBuffer[offset + 2] << 16) | ((uint32_t)mBuffer[offset + 3] << 24);
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mOffset += sizeof(value);
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return true;
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}
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bool MtpDataPacket::getUInt64(uint64_t& value) {
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if (mPacketSize - mOffset < sizeof(value))
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return false;
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int offset = mOffset;
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value = (uint64_t)mBuffer[offset] | ((uint64_t)mBuffer[offset + 1] << 8) |
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((uint64_t)mBuffer[offset + 2] << 16) | ((uint64_t)mBuffer[offset + 3] << 24) |
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((uint64_t)mBuffer[offset + 4] << 32) | ((uint64_t)mBuffer[offset + 5] << 40) |
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((uint64_t)mBuffer[offset + 6] << 48) | ((uint64_t)mBuffer[offset + 7] << 56);
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mOffset += sizeof(value);
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return true;
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}
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bool MtpDataPacket::getUInt128(uint128_t& value) {
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return getUInt32(value[0]) && getUInt32(value[1]) && getUInt32(value[2]) && getUInt32(value[3]);
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}
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bool MtpDataPacket::getString(MtpStringBuffer& string)
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{
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return string.readFromPacket(this);
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}
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Int8List* MtpDataPacket::getAInt8() {
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uint32_t count;
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if (!getUInt32(count))
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return NULL;
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Int8List* result = new Int8List;
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for (uint32_t i = 0; i < count; i++) {
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int8_t value;
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if (!getInt8(value)) {
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delete result;
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return NULL;
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}
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result->push_back(value);
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}
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return result;
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}
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UInt8List* MtpDataPacket::getAUInt8() {
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uint32_t count;
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if (!getUInt32(count))
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return NULL;
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UInt8List* result = new UInt8List;
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for (uint32_t i = 0; i < count; i++) {
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uint8_t value;
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if (!getUInt8(value)) {
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delete result;
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return NULL;
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}
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result->push_back(value);
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}
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return result;
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}
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Int16List* MtpDataPacket::getAInt16() {
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uint32_t count;
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if (!getUInt32(count))
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return NULL;
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Int16List* result = new Int16List;
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for (uint32_t i = 0; i < count; i++) {
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int16_t value;
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if (!getInt16(value)) {
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delete result;
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return NULL;
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}
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result->push_back(value);
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}
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return result;
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}
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UInt16List* MtpDataPacket::getAUInt16() {
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uint32_t count;
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if (!getUInt32(count))
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return NULL;
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UInt16List* result = new UInt16List;
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for (uint32_t i = 0; i < count; i++) {
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uint16_t value;
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if (!getUInt16(value)) {
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delete result;
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return NULL;
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}
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result->push_back(value);
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}
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return result;
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}
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Int32List* MtpDataPacket::getAInt32() {
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uint32_t count;
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if (!getUInt32(count))
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return NULL;
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Int32List* result = new Int32List;
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for (uint32_t i = 0; i < count; i++) {
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int32_t value;
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if (!getInt32(value)) {
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delete result;
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return NULL;
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}
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result->push_back(value);
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}
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return result;
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}
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UInt32List* MtpDataPacket::getAUInt32() {
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uint32_t count;
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if (!getUInt32(count))
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return NULL;
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UInt32List* result = new UInt32List;
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for (uint32_t i = 0; i < count; i++) {
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uint32_t value;
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if (!getUInt32(value)) {
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delete result;
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return NULL;
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}
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result->push_back(value);
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}
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return result;
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}
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Int64List* MtpDataPacket::getAInt64() {
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uint32_t count;
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if (!getUInt32(count))
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return NULL;
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Int64List* result = new Int64List;
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for (uint32_t i = 0; i < count; i++) {
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int64_t value;
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if (!getInt64(value)) {
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delete result;
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return NULL;
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}
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result->push_back(value);
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}
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return result;
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}
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UInt64List* MtpDataPacket::getAUInt64() {
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uint32_t count;
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if (!getUInt32(count))
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return NULL;
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UInt64List* result = new UInt64List;
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for (uint32_t i = 0; i < count; i++) {
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uint64_t value;
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if (!getUInt64(value)) {
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delete result;
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return NULL;
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}
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result->push_back(value);
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}
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return result;
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}
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void MtpDataPacket::putInt8(int8_t value) {
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allocate(mOffset + 1);
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mBuffer[mOffset++] = (uint8_t)value;
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if (mPacketSize < mOffset)
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mPacketSize = mOffset;
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}
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void MtpDataPacket::putUInt8(uint8_t value) {
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allocate(mOffset + 1);
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mBuffer[mOffset++] = (uint8_t)value;
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if (mPacketSize < mOffset)
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mPacketSize = mOffset;
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}
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void MtpDataPacket::putInt16(int16_t value) {
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allocate(mOffset + 2);
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mBuffer[mOffset++] = (uint8_t)(value & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 8) & 0xFF);
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if (mPacketSize < mOffset)
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mPacketSize = mOffset;
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}
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void MtpDataPacket::putUInt16(uint16_t value) {
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allocate(mOffset + 2);
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mBuffer[mOffset++] = (uint8_t)(value & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 8) & 0xFF);
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if (mPacketSize < mOffset)
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mPacketSize = mOffset;
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}
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void MtpDataPacket::putInt32(int32_t value) {
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allocate(mOffset + 4);
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mBuffer[mOffset++] = (uint8_t)(value & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 8) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 16) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 24) & 0xFF);
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if (mPacketSize < mOffset)
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mPacketSize = mOffset;
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}
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void MtpDataPacket::putUInt32(uint32_t value) {
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allocate(mOffset + 4);
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mBuffer[mOffset++] = (uint8_t)(value & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 8) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 16) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 24) & 0xFF);
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if (mPacketSize < mOffset)
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mPacketSize = mOffset;
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}
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void MtpDataPacket::putInt64(int64_t value) {
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allocate(mOffset + 8);
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mBuffer[mOffset++] = (uint8_t)(value & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 8) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 16) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 24) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 32) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 40) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 48) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 56) & 0xFF);
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if (mPacketSize < mOffset)
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mPacketSize = mOffset;
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}
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void MtpDataPacket::putUInt64(uint64_t value) {
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allocate(mOffset + 8);
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mBuffer[mOffset++] = (uint8_t)(value & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 8) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 16) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 24) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 32) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 40) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 48) & 0xFF);
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mBuffer[mOffset++] = (uint8_t)((value >> 56) & 0xFF);
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if (mPacketSize < mOffset)
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mPacketSize = mOffset;
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}
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void MtpDataPacket::putInt128(const int128_t& value) {
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putInt32(value[0]);
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putInt32(value[1]);
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putInt32(value[2]);
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putInt32(value[3]);
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}
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void MtpDataPacket::putUInt128(const uint128_t& value) {
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putUInt32(value[0]);
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putUInt32(value[1]);
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putUInt32(value[2]);
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putUInt32(value[3]);
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}
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void MtpDataPacket::putInt128(int64_t value) {
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putInt64(value);
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putInt64(value < 0 ? -1 : 0);
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}
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void MtpDataPacket::putUInt128(uint64_t value) {
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putUInt64(value);
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putUInt64(0);
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}
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void MtpDataPacket::putAInt8(const int8_t* values, int count) {
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putUInt32(count);
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for (int i = 0; i < count; i++)
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putInt8(*values++);
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}
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void MtpDataPacket::putAUInt8(const uint8_t* values, int count) {
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putUInt32(count);
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for (int i = 0; i < count; i++)
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putUInt8(*values++);
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}
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void MtpDataPacket::putAInt16(const int16_t* values, int count) {
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putUInt32(count);
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for (int i = 0; i < count; i++)
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putInt16(*values++);
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}
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void MtpDataPacket::putAUInt16(const uint16_t* values, int count) {
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putUInt32(count);
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for (int i = 0; i < count; i++)
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putUInt16(*values++);
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}
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void MtpDataPacket::putAUInt16(const UInt16List* values) {
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size_t count = (values ? values->size() : 0);
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putUInt32(count);
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for (size_t i = 0; i < count; i++)
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putUInt16((*values)[i]);
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}
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void MtpDataPacket::putAInt32(const int32_t* values, int count) {
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putUInt32(count);
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for (int i = 0; i < count; i++)
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putInt32(*values++);
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}
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void MtpDataPacket::putAUInt32(const uint32_t* values, int count) {
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putUInt32(count);
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for (int i = 0; i < count; i++)
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putUInt32(*values++);
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}
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void MtpDataPacket::putAUInt32(const UInt32List* list) {
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if (!list) {
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putEmptyArray();
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} else {
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size_t size = list->size();
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putUInt32(size);
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for (size_t i = 0; i < size; i++)
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putUInt32((*list)[i]);
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}
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}
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void MtpDataPacket::putAInt64(const int64_t* values, int count) {
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putUInt32(count);
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for (int i = 0; i < count; i++)
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putInt64(*values++);
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}
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void MtpDataPacket::putAUInt64(const uint64_t* values, int count) {
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putUInt32(count);
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for (int i = 0; i < count; i++)
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putUInt64(*values++);
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}
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void MtpDataPacket::putString(const MtpStringBuffer& string) {
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string.writeToPacket(this);
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}
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void MtpDataPacket::putString(const char* s) {
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MtpStringBuffer string(s);
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string.writeToPacket(this);
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}
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void MtpDataPacket::putString(const uint16_t* string) {
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int count = 0;
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for (int i = 0; i <= MTP_STRING_MAX_CHARACTER_NUMBER; i++) {
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if (string[i])
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count++;
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else
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break;
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}
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putUInt8(count > 0 ? count + 1 : 0);
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for (int i = 0; i < count; i++)
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putUInt16(string[i]);
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// only terminate with zero if string is not empty
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if (count > 0)
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putUInt16(0);
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}
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#ifdef MTP_DEVICE
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int MtpDataPacket::read(IMtpHandle *h) {
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int ret = h->read(mBuffer, MTP_BUFFER_SIZE);
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if (ret < MTP_CONTAINER_HEADER_SIZE)
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return -1;
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mPacketSize = ret;
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mOffset = MTP_CONTAINER_HEADER_SIZE;
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return ret;
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}
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int MtpDataPacket::write(IMtpHandle *h) {
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MtpPacket::putUInt32(MTP_CONTAINER_LENGTH_OFFSET, mPacketSize);
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MtpPacket::putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_DATA);
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int ret = h->write(mBuffer, mPacketSize);
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return (ret < 0 ? ret : 0);
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}
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int MtpDataPacket::writeData(IMtpHandle *h, void* data, uint32_t length) {
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allocate(length + MTP_CONTAINER_HEADER_SIZE);
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memcpy(mBuffer + MTP_CONTAINER_HEADER_SIZE, data, length);
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length += MTP_CONTAINER_HEADER_SIZE;
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MtpPacket::putUInt32(MTP_CONTAINER_LENGTH_OFFSET, length);
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MtpPacket::putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_DATA);
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int ret = h->write(mBuffer, length);
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return (ret < 0 ? ret : 0);
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}
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#endif // MTP_DEVICE
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#ifdef MTP_HOST
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int MtpDataPacket::read(struct usb_request *request) {
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// first read the header
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request->buffer = mBuffer;
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request->buffer_length = mBufferSize;
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int length = transfer(request);
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if (length >= MTP_CONTAINER_HEADER_SIZE) {
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// look at the length field to see if the data spans multiple packets
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uint32_t totalLength = MtpPacket::getUInt32(MTP_CONTAINER_LENGTH_OFFSET);
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allocate(totalLength);
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while (totalLength > static_cast<uint32_t>(length)) {
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request->buffer = mBuffer + length;
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request->buffer_length = totalLength - length;
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int ret = transfer(request);
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if (ret >= 0)
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length += ret;
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else {
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length = ret;
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break;
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}
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}
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}
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if (length >= 0)
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mPacketSize = length;
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return length;
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}
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int MtpDataPacket::readData(struct usb_request *request, void* buffer, int length) {
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int read = 0;
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while (read < length) {
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request->buffer = (char *)buffer + read;
|
|
request->buffer_length = length - read;
|
|
int ret = transfer(request);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
read += ret;
|
|
}
|
|
return read;
|
|
}
|
|
|
|
// Queue a read request. Call readDataWait to wait for result
|
|
int MtpDataPacket::readDataAsync(struct usb_request *req) {
|
|
if (usb_request_queue(req)) {
|
|
ALOGE("usb_endpoint_queue failed, errno: %d", errno);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// Wait for result of readDataAsync
|
|
int MtpDataPacket::readDataWait(struct usb_device *device) {
|
|
struct usb_request *req = usb_request_wait(device, -1);
|
|
return (req ? req->actual_length : -1);
|
|
}
|
|
|
|
int MtpDataPacket::readDataHeader(struct usb_request *request) {
|
|
request->buffer = mBuffer;
|
|
request->buffer_length = request->max_packet_size;
|
|
int length = transfer(request);
|
|
if (length >= 0)
|
|
mPacketSize = length;
|
|
return length;
|
|
}
|
|
|
|
int MtpDataPacket::write(struct usb_request *request, UrbPacketDivisionMode divisionMode) {
|
|
if (mPacketSize < MTP_CONTAINER_HEADER_SIZE || mPacketSize > MTP_BUFFER_SIZE) {
|
|
ALOGE("Illegal packet size.");
|
|
return -1;
|
|
}
|
|
|
|
MtpPacket::putUInt32(MTP_CONTAINER_LENGTH_OFFSET, mPacketSize);
|
|
MtpPacket::putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_DATA);
|
|
|
|
size_t processedBytes = 0;
|
|
while (processedBytes < mPacketSize) {
|
|
const size_t write_size =
|
|
processedBytes == 0 && divisionMode == FIRST_PACKET_ONLY_HEADER ?
|
|
MTP_CONTAINER_HEADER_SIZE : mPacketSize - processedBytes;
|
|
request->buffer = mBuffer + processedBytes;
|
|
request->buffer_length = write_size;
|
|
const int result = transfer(request);
|
|
if (result < 0) {
|
|
ALOGE("Failed to write bytes to the device.");
|
|
return -1;
|
|
}
|
|
processedBytes += result;
|
|
}
|
|
|
|
return processedBytes == mPacketSize ? processedBytes : -1;
|
|
}
|
|
|
|
int64_t MtpDataPacket::write(struct usb_request *request,
|
|
UrbPacketDivisionMode divisionMode,
|
|
int fd,
|
|
size_t payloadSize) {
|
|
// Obtain the greatest multiple of minimum packet size that is not greater than
|
|
// MTP_BUFFER_SIZE.
|
|
if (request->max_packet_size <= 0) {
|
|
ALOGE("Cannot determine bulk transfer size due to illegal max packet size %d.",
|
|
request->max_packet_size);
|
|
return -1;
|
|
}
|
|
const size_t maxBulkTransferSize =
|
|
MTP_BUFFER_SIZE - (MTP_BUFFER_SIZE % request->max_packet_size);
|
|
const size_t containerLength = payloadSize + MTP_CONTAINER_HEADER_SIZE;
|
|
size_t processedBytes = 0;
|
|
bool readError = false;
|
|
|
|
// Bind the packet with given request.
|
|
request->buffer = mBuffer;
|
|
allocate(maxBulkTransferSize);
|
|
|
|
while (processedBytes < containerLength) {
|
|
size_t bulkTransferSize = 0;
|
|
|
|
// prepare header.
|
|
const bool headerSent = processedBytes != 0;
|
|
if (!headerSent) {
|
|
MtpPacket::putUInt32(MTP_CONTAINER_LENGTH_OFFSET, containerLength);
|
|
MtpPacket::putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_DATA);
|
|
bulkTransferSize += MTP_CONTAINER_HEADER_SIZE;
|
|
}
|
|
|
|
// Prepare payload.
|
|
if (headerSent || divisionMode == FIRST_PACKET_HAS_PAYLOAD) {
|
|
const size_t processedPayloadBytes =
|
|
headerSent ? processedBytes - MTP_CONTAINER_HEADER_SIZE : 0;
|
|
const size_t maxRead = payloadSize - processedPayloadBytes;
|
|
const size_t maxWrite = maxBulkTransferSize - bulkTransferSize;
|
|
const size_t bulkTransferPayloadSize = std::min(maxRead, maxWrite);
|
|
// prepare payload.
|
|
if (!readError) {
|
|
const ssize_t result = readExactBytes(
|
|
fd,
|
|
mBuffer + bulkTransferSize,
|
|
bulkTransferPayloadSize);
|
|
if (result < 0) {
|
|
ALOGE("Found an error while reading data from FD. Send 0 data instead.");
|
|
readError = true;
|
|
}
|
|
}
|
|
if (readError) {
|
|
memset(mBuffer + bulkTransferSize, 0, bulkTransferPayloadSize);
|
|
}
|
|
bulkTransferSize += bulkTransferPayloadSize;
|
|
}
|
|
|
|
// Bulk transfer.
|
|
mPacketSize = bulkTransferSize;
|
|
request->buffer_length = bulkTransferSize;
|
|
const int result = transfer(request);
|
|
if (result != static_cast<ssize_t>(bulkTransferSize)) {
|
|
// Cannot recover writing error.
|
|
ALOGE("Found an error while write data to MtpDevice.");
|
|
return -1;
|
|
}
|
|
|
|
// Update variables.
|
|
processedBytes += bulkTransferSize;
|
|
}
|
|
|
|
return readError ? -1 : processedBytes;
|
|
}
|
|
|
|
#endif // MTP_HOST
|
|
|
|
void* MtpDataPacket::getData(int* outLength) const {
|
|
int length = mPacketSize - MTP_CONTAINER_HEADER_SIZE;
|
|
if (length > 0) {
|
|
void* result = malloc(length);
|
|
if (result) {
|
|
memcpy(result, mBuffer + MTP_CONTAINER_HEADER_SIZE, length);
|
|
*outLength = length;
|
|
return result;
|
|
}
|
|
}
|
|
*outLength = 0;
|
|
return NULL;
|
|
}
|
|
|
|
} // namespace android
|