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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #define LOG_TAG "MtpPacket"
     18 
     19 #include "MtpDebug.h"
     20 #include "MtpPacket.h"
     21 #include "mtp.h"
     22 
     23 #include <stdio.h>
     24 #include <stdlib.h>
     25 #include <stdio.h>
     26 
     27 #include <usbhost/usbhost.h>
     28 
     29 namespace android {
     30 
     31 MtpPacket::MtpPacket(int bufferSize)
     32     :   mBuffer(NULL),
     33         mBufferSize(bufferSize),
     34         mAllocationIncrement(bufferSize),
     35         mPacketSize(0)
     36 {
     37     mBuffer = (uint8_t *)malloc(bufferSize);
     38     if (!mBuffer) {
     39         ALOGE("out of memory!");
     40         abort();
     41     }
     42 }
     43 
     44 MtpPacket::~MtpPacket() {
     45     if (mBuffer)
     46         free(mBuffer);
     47 }
     48 
     49 void MtpPacket::reset() {
     50     allocate(MTP_CONTAINER_HEADER_SIZE);
     51     mPacketSize = MTP_CONTAINER_HEADER_SIZE;
     52     memset(mBuffer, 0, mBufferSize);
     53 }
     54 
     55 void MtpPacket::allocate(int length) {
     56     if (length > mBufferSize) {
     57         int newLength = length + mAllocationIncrement;
     58         mBuffer = (uint8_t *)realloc(mBuffer, newLength);
     59         if (!mBuffer) {
     60             ALOGE("out of memory!");
     61             abort();
     62         }
     63         mBufferSize = newLength;
     64     }
     65 }
     66 
     67 void MtpPacket::dump() {
     68 #define DUMP_BYTES_PER_ROW  16
     69     char buffer[500];
     70     char* bufptr = buffer;
     71 
     72     for (int i = 0; i < mPacketSize; i++) {
     73         sprintf(bufptr, "%02X ", mBuffer[i]);
     74         bufptr += strlen(bufptr);
     75         if (i % DUMP_BYTES_PER_ROW == (DUMP_BYTES_PER_ROW - 1)) {
     76             ALOGV("%s", buffer);
     77             bufptr = buffer;
     78         }
     79     }
     80     if (bufptr != buffer) {
     81         // print last line
     82         ALOGV("%s", buffer);
     83     }
     84     ALOGV("\n");
     85 }
     86 
     87 void MtpPacket::copyFrom(const MtpPacket& src) {
     88     int length = src.mPacketSize;
     89     allocate(length);
     90     mPacketSize = length;
     91     memcpy(mBuffer, src.mBuffer, length);
     92 }
     93 
     94 uint16_t MtpPacket::getUInt16(int offset) const {
     95     return ((uint16_t)mBuffer[offset + 1] << 8) | (uint16_t)mBuffer[offset];
     96 }
     97 
     98 uint32_t MtpPacket::getUInt32(int offset) const {
     99     return ((uint32_t)mBuffer[offset + 3] << 24) | ((uint32_t)mBuffer[offset + 2] << 16) |
    100            ((uint32_t)mBuffer[offset + 1] << 8)  | (uint32_t)mBuffer[offset];
    101 }
    102 
    103 void MtpPacket::putUInt16(int offset, uint16_t value) {
    104     mBuffer[offset++] = (uint8_t)(value & 0xFF);
    105     mBuffer[offset++] = (uint8_t)((value >> 8) & 0xFF);
    106 }
    107 
    108 void MtpPacket::putUInt32(int offset, uint32_t value) {
    109     mBuffer[offset++] = (uint8_t)(value & 0xFF);
    110     mBuffer[offset++] = (uint8_t)((value >> 8) & 0xFF);
    111     mBuffer[offset++] = (uint8_t)((value >> 16) & 0xFF);
    112     mBuffer[offset++] = (uint8_t)((value >> 24) & 0xFF);
    113 }
    114 
    115 uint16_t MtpPacket::getContainerCode() const {
    116     return getUInt16(MTP_CONTAINER_CODE_OFFSET);
    117 }
    118 
    119 void MtpPacket::setContainerCode(uint16_t code) {
    120     putUInt16(MTP_CONTAINER_CODE_OFFSET, code);
    121 }
    122 
    123 uint16_t MtpPacket::getContainerType() const {
    124     return getUInt16(MTP_CONTAINER_TYPE_OFFSET);
    125 }
    126 
    127 MtpTransactionID MtpPacket::getTransactionID() const {
    128     return getUInt32(MTP_CONTAINER_TRANSACTION_ID_OFFSET);
    129 }
    130 
    131 void MtpPacket::setTransactionID(MtpTransactionID id) {
    132     putUInt32(MTP_CONTAINER_TRANSACTION_ID_OFFSET, id);
    133 }
    134 
    135 uint32_t MtpPacket::getParameter(int index) const {
    136     if (index < 1 || index > 5) {
    137         ALOGE("index %d out of range in MtpPacket::getParameter", index);
    138         return 0;
    139     }
    140     return getUInt32(MTP_CONTAINER_PARAMETER_OFFSET + (index - 1) * sizeof(uint32_t));
    141 }
    142 
    143 void MtpPacket::setParameter(int index, uint32_t value) {
    144     if (index < 1 || index > 5) {
    145         ALOGE("index %d out of range in MtpPacket::setParameter", index);
    146         return;
    147     }
    148     int offset = MTP_CONTAINER_PARAMETER_OFFSET + (index - 1) * sizeof(uint32_t);
    149     if (mPacketSize < offset + sizeof(uint32_t))
    150         mPacketSize = offset + sizeof(uint32_t);
    151     putUInt32(offset, value);
    152 }
    153 
    154 #ifdef MTP_HOST
    155 int MtpPacket::transfer(struct usb_request* request) {
    156     int result = usb_device_bulk_transfer(request->dev,
    157                             request->endpoint,
    158                             request->buffer,
    159                             request->buffer_length,
    160                             0);
    161     request->actual_length = result;
    162     return result;
    163 }
    164 #endif
    165 
    166 }  // namespace android
    167