From af32bb9c4f4f06e92de3435ed2db3153c0701094 Mon Sep 17 00:00:00 2001 From: bigbiff bigbiff Date: Tue, 18 Dec 2018 18:39:53 -0500 Subject: MTP FFS updates: This update splits old MTP code and new MTP code from Google into two trees, legacy and ffs. Depending on the SDK level, the build system will select the correct version. The reason for separating the versions out are due to older android trees not supporting the updated MTP code from Google. Most MTP code is from Google, with additions needed from implementing the Java functions in C++ for TWRP and FFS. We assume if you are in android-9.0 or above, your kernel has support for FFS over MTP. Verify that your init.rc is mounting the MTP FFS driver to the proper location. Change-Id: I4b107b239bd9bc5699527f9c8c77d9079f264a7e --- mtp/legacy/MtpStringBuffer.cpp | 167 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 167 insertions(+) create mode 100644 mtp/legacy/MtpStringBuffer.cpp (limited to 'mtp/legacy/MtpStringBuffer.cpp') diff --git a/mtp/legacy/MtpStringBuffer.cpp b/mtp/legacy/MtpStringBuffer.cpp new file mode 100644 index 000000000..8aeb3ca94 --- /dev/null +++ b/mtp/legacy/MtpStringBuffer.cpp @@ -0,0 +1,167 @@ +/* + * 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 +#include "MtpDataPacket.h" +#include "MtpStringBuffer.h" + +MtpStringBuffer::MtpStringBuffer() + : mCharCount(0), + mByteCount(1) +{ + mBuffer[0] = 0; +} + +MtpStringBuffer::MtpStringBuffer(const char* src) + : mCharCount(0), + mByteCount(1) +{ + set(src); +} + +MtpStringBuffer::MtpStringBuffer(const uint16_t* src) + : mCharCount(0), + mByteCount(1) +{ + set(src); +} + +MtpStringBuffer::MtpStringBuffer(const MtpStringBuffer& src) + : mCharCount(src.mCharCount), + mByteCount(src.mByteCount) +{ + memcpy(mBuffer, src.mBuffer, mByteCount); +} + + +MtpStringBuffer::~MtpStringBuffer() { +} + +void MtpStringBuffer::set(const char* src) { + size_t length = strlen(src); + if (length >= sizeof(mBuffer)) + length = sizeof(mBuffer) - 1; + memcpy(mBuffer, src, length); + + // count the characters + int count = 0; + char ch; + while ((ch = *src++) != 0) { + if ((ch & 0x80) == 0) { + // single byte character + } else if ((ch & 0xE0) == 0xC0) { + // two byte character + if (! *src++) { + // last character was truncated, so ignore last byte + length--; + break; + } + } else if ((ch & 0xF0) == 0xE0) { + // 3 byte char + if (! *src++) { + // last character was truncated, so ignore last byte + length--; + break; + } + if (! *src++) { + // last character was truncated, so ignore last two bytes + length -= 2; + break; + } + } + count++; + } + + mByteCount = length + 1; + mBuffer[length] = 0; + mCharCount = count; +} + +void MtpStringBuffer::set(const uint16_t* src) { + int count = 0; + uint16_t ch; + uint8_t* dest = mBuffer; + + while ((ch = *src++) != 0 && count < 255) { + if (ch >= 0x0800) { + *dest++ = (uint8_t)(0xE0 | (ch >> 12)); + *dest++ = (uint8_t)(0x80 | ((ch >> 6) & 0x3F)); + *dest++ = (uint8_t)(0x80 | (ch & 0x3F)); + } else if (ch >= 0x80) { + *dest++ = (uint8_t)(0xC0 | (ch >> 6)); + *dest++ = (uint8_t)(0x80 | (ch & 0x3F)); + } else { + *dest++ = ch; + } + count++; + } + *dest++ = 0; + mCharCount = count; + mByteCount = dest - mBuffer; +} + +void MtpStringBuffer::readFromPacket(MtpDataPacket* packet) { + int count = packet->getUInt8(); + uint8_t* dest = mBuffer; + for (int i = 0; i < count; i++) { + uint16_t ch = packet->getUInt16(); + if (ch >= 0x0800) { + *dest++ = (uint8_t)(0xE0 | (ch >> 12)); + *dest++ = (uint8_t)(0x80 | ((ch >> 6) & 0x3F)); + *dest++ = (uint8_t)(0x80 | (ch & 0x3F)); + } else if (ch >= 0x80) { + *dest++ = (uint8_t)(0xC0 | (ch >> 6)); + *dest++ = (uint8_t)(0x80 | (ch & 0x3F)); + } else { + *dest++ = ch; + } + } + *dest++ = 0; + mCharCount = count; + mByteCount = dest - mBuffer; +} + +void MtpStringBuffer::writeToPacket(MtpDataPacket* packet) const { + int count = mCharCount; + const uint8_t* src = mBuffer; + packet->putUInt8(count > 0 ? count + 1 : 0); + + // expand utf8 to 16 bit chars + for (int i = 0; i < count; i++) { + uint16_t ch; + uint16_t ch1 = *src++; + if ((ch1 & 0x80) == 0) { + // single byte character + ch = ch1; + } else if ((ch1 & 0xE0) == 0xC0) { + // two byte character + uint16_t ch2 = *src++; + ch = ((ch1 & 0x1F) << 6) | (ch2 & 0x3F); + } else { + // three byte character + uint16_t ch2 = *src++; + uint16_t ch3 = *src++; + ch = ((ch1 & 0x0F) << 12) | ((ch2 & 0x3F) << 6) | (ch3 & 0x3F); + } + packet->putUInt16(ch); + } + // only terminate with zero if string is not empty + if (count > 0) + packet->putUInt16(0); +} + -- cgit v1.2.3