THRIFT-922. cpp: Templatize binary and compact protocol
Convert TBinaryProtocol and TCompactProtocol to template classes, taking
the transport class as a template parameter. This allows them to make
non-virtual calls when using the template, improving serialization
performance.
git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@1005136 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/cpp/src/protocol/TCompactProtocol.tcc b/lib/cpp/src/protocol/TCompactProtocol.tcc
new file mode 100644
index 0000000..2448146
--- /dev/null
+++ b/lib/cpp/src/protocol/TCompactProtocol.tcc
@@ -0,0 +1,808 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+#ifndef _THRIFT_PROTOCOL_TCOMPACTPROTOCOL_TCC_
+#define _THRIFT_PROTOCOL_TCOMPACTPROTOCOL_TCC_ 1
+
+#include <limits>
+
+/*
+ * TCompactProtocol::i*ToZigzag depend on the fact that the right shift
+ * operator on a signed integer is an arithmetic (sign-extending) shift.
+ * If this is not the case, the current implementation will not work.
+ * If anyone encounters this error, we can try to figure out the best
+ * way to implement an arithmetic right shift on their platform.
+ */
+#if !defined(SIGNED_RIGHT_SHIFT_IS) || !defined(ARITHMETIC_RIGHT_SHIFT)
+# error "Unable to determine the behavior of a signed right shift"
+#endif
+#if SIGNED_RIGHT_SHIFT_IS != ARITHMETIC_RIGHT_SHIFT
+# error "TCompactProtocol currently only works if a signed right shift is arithmetic"
+#endif
+
+#ifdef __GNUC__
+#define UNLIKELY(val) (__builtin_expect((val), 0))
+#else
+#define UNLIKELY(val) (val)
+#endif
+
+namespace apache { namespace thrift { namespace protocol {
+
+namespace detail { namespace compact {
+
+enum Types {
+ CT_STOP = 0x00,
+ CT_BOOLEAN_TRUE = 0x01,
+ CT_BOOLEAN_FALSE = 0x02,
+ CT_BYTE = 0x03,
+ CT_I16 = 0x04,
+ CT_I32 = 0x05,
+ CT_I64 = 0x06,
+ CT_DOUBLE = 0x07,
+ CT_BINARY = 0x08,
+ CT_LIST = 0x09,
+ CT_SET = 0x0A,
+ CT_MAP = 0x0B,
+ CT_STRUCT = 0x0C,
+};
+
+const int8_t TTypeToCType[16] = {
+ CT_STOP, // T_STOP
+ 0, // unused
+ CT_BOOLEAN_TRUE, // T_BOOL
+ CT_BYTE, // T_BYTE
+ CT_DOUBLE, // T_DOUBLE
+ 0, // unused
+ CT_I16, // T_I16
+ 0, // unused
+ CT_I32, // T_I32
+ 0, // unused
+ CT_I64, // T_I64
+ CT_BINARY, // T_STRING
+ CT_STRUCT, // T_STRUCT
+ CT_MAP, // T_MAP
+ CT_SET, // T_SET
+ CT_LIST, // T_LIST
+};
+
+}} // end detail::compact namespace
+
+
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeMessageBegin(
+ const std::string& name,
+ const TMessageType messageType,
+ const int32_t seqid) {
+ uint32_t wsize = 0;
+ wsize += writeByte(PROTOCOL_ID);
+ wsize += writeByte((VERSION_N & VERSION_MASK) | (((int32_t)messageType << TYPE_SHIFT_AMOUNT) & TYPE_MASK));
+ wsize += writeVarint32(seqid);
+ wsize += writeString(name);
+ return wsize;
+}
+
+/**
+ * Write a field header containing the field id and field type. If the
+ * difference between the current field id and the last one is small (< 15),
+ * then the field id will be encoded in the 4 MSB as a delta. Otherwise, the
+ * field id will follow the type header as a zigzag varint.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeFieldBegin(const char* name,
+ const TType fieldType,
+ const int16_t fieldId) {
+ if (fieldType == T_BOOL) {
+ booleanField_.name = name;
+ booleanField_.fieldType = fieldType;
+ booleanField_.fieldId = fieldId;
+ } else {
+ return writeFieldBeginInternal(name, fieldType, fieldId, -1);
+ }
+ return 0;
+}
+
+/**
+ * Write the STOP symbol so we know there are no more fields in this struct.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeFieldStop() {
+ return writeByte(T_STOP);
+}
+
+/**
+ * Write a struct begin. This doesn't actually put anything on the wire. We
+ * use it as an opportunity to put special placeholder markers on the field
+ * stack so we can get the field id deltas correct.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeStructBegin(const char* name) {
+ lastField_.push(lastFieldId_);
+ lastFieldId_ = 0;
+ return 0;
+}
+
+/**
+ * Write a struct end. This doesn't actually put anything on the wire. We use
+ * this as an opportunity to pop the last field from the current struct off
+ * of the field stack.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeStructEnd() {
+ lastFieldId_ = lastField_.top();
+ lastField_.pop();
+ return 0;
+}
+
+/**
+ * Write a List header.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeListBegin(const TType elemType,
+ const uint32_t size) {
+ return writeCollectionBegin(elemType, size);
+}
+
+/**
+ * Write a set header.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeSetBegin(const TType elemType,
+ const uint32_t size) {
+ return writeCollectionBegin(elemType, size);
+}
+
+/**
+ * Write a map header. If the map is empty, omit the key and value type
+ * headers, as we don't need any additional information to skip it.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeMapBegin(const TType keyType,
+ const TType valType,
+ const uint32_t size) {
+ uint32_t wsize = 0;
+
+ if (size == 0) {
+ wsize += writeByte(0);
+ } else {
+ wsize += writeVarint32(size);
+ wsize += writeByte(getCompactType(keyType) << 4 | getCompactType(valType));
+ }
+ return wsize;
+}
+
+/**
+ * Write a boolean value. Potentially, this could be a boolean field, in
+ * which case the field header info isn't written yet. If so, decide what the
+ * right type header is for the value and then write the field header.
+ * Otherwise, write a single byte.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeBool(const bool value) {
+ uint32_t wsize = 0;
+
+ if (booleanField_.name != NULL) {
+ // we haven't written the field header yet
+ wsize += writeFieldBeginInternal(booleanField_.name,
+ booleanField_.fieldType,
+ booleanField_.fieldId,
+ value ? detail::compact::CT_BOOLEAN_TRUE :
+ detail::compact::CT_BOOLEAN_FALSE);
+ booleanField_.name = NULL;
+ } else {
+ // we're not part of a field, so just write the value
+ wsize += writeByte(value ? detail::compact::CT_BOOLEAN_TRUE :
+ detail::compact::CT_BOOLEAN_FALSE);
+ }
+ return wsize;
+}
+
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeByte(const int8_t byte) {
+ trans_->write((uint8_t*)&byte, 1);
+ return 1;
+}
+
+/**
+ * Write an i16 as a zigzag varint.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeI16(const int16_t i16) {
+ return writeVarint32(i32ToZigzag(i16));
+}
+
+/**
+ * Write an i32 as a zigzag varint.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeI32(const int32_t i32) {
+ return writeVarint32(i32ToZigzag(i32));
+}
+
+/**
+ * Write an i64 as a zigzag varint.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeI64(const int64_t i64) {
+ return writeVarint64(i64ToZigzag(i64));
+}
+
+/**
+ * Write a double to the wire as 8 bytes.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeDouble(const double dub) {
+ BOOST_STATIC_ASSERT(sizeof(double) == sizeof(uint64_t));
+ BOOST_STATIC_ASSERT(std::numeric_limits<double>::is_iec559);
+
+ uint64_t bits = bitwise_cast<uint64_t>(dub);
+ bits = htolell(bits);
+ trans_->write((uint8_t*)&bits, 8);
+ return 8;
+}
+
+/**
+ * Write a string to the wire with a varint size preceeding.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeString(const std::string& str) {
+ return writeBinary(str);
+}
+
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeBinary(const std::string& str) {
+ uint32_t ssize = str.size();
+ uint32_t wsize = writeVarint32(ssize) + ssize;
+ trans_->write((uint8_t*)str.data(), ssize);
+ return wsize;
+}
+
+//
+// Internal Writing methods
+//
+
+/**
+ * The workhorse of writeFieldBegin. It has the option of doing a
+ * 'type override' of the type header. This is used specifically in the
+ * boolean field case.
+ */
+template <class Transport_>
+int32_t TCompactProtocolT<Transport_>::writeFieldBeginInternal(
+ const char* name,
+ const TType fieldType,
+ const int16_t fieldId,
+ int8_t typeOverride) {
+ uint32_t wsize = 0;
+
+ // if there's a type override, use that.
+ int8_t typeToWrite = (typeOverride == -1 ? getCompactType(fieldType) : typeOverride);
+
+ // check if we can use delta encoding for the field id
+ if (fieldId > lastFieldId_ && fieldId - lastFieldId_ <= 15) {
+ // write them together
+ wsize += writeByte((fieldId - lastFieldId_) << 4 | typeToWrite);
+ } else {
+ // write them separate
+ wsize += writeByte(typeToWrite);
+ wsize += writeI16(fieldId);
+ }
+
+ lastFieldId_ = fieldId;
+ return wsize;
+}
+
+/**
+ * Abstract method for writing the start of lists and sets. List and sets on
+ * the wire differ only by the type indicator.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeCollectionBegin(int8_t elemType,
+ int32_t size) {
+ uint32_t wsize = 0;
+ if (size <= 14) {
+ wsize += writeByte(size << 4 | getCompactType(elemType));
+ } else {
+ wsize += writeByte(0xf0 | getCompactType(elemType));
+ wsize += writeVarint32(size);
+ }
+ return wsize;
+}
+
+/**
+ * Write an i32 as a varint. Results in 1-5 bytes on the wire.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeVarint32(uint32_t n) {
+ uint8_t buf[5];
+ uint32_t wsize = 0;
+
+ while (true) {
+ if ((n & ~0x7F) == 0) {
+ buf[wsize++] = (int8_t)n;
+ break;
+ } else {
+ buf[wsize++] = (int8_t)((n & 0x7F) | 0x80);
+ n >>= 7;
+ }
+ }
+ trans_->write(buf, wsize);
+ return wsize;
+}
+
+/**
+ * Write an i64 as a varint. Results in 1-10 bytes on the wire.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::writeVarint64(uint64_t n) {
+ uint8_t buf[10];
+ uint32_t wsize = 0;
+
+ while (true) {
+ if ((n & ~0x7FL) == 0) {
+ buf[wsize++] = (int8_t)n;
+ break;
+ } else {
+ buf[wsize++] = (int8_t)((n & 0x7F) | 0x80);
+ n >>= 7;
+ }
+ }
+ trans_->write(buf, wsize);
+ return wsize;
+}
+
+/**
+ * Convert l into a zigzag long. This allows negative numbers to be
+ * represented compactly as a varint.
+ */
+template <class Transport_>
+uint64_t TCompactProtocolT<Transport_>::i64ToZigzag(const int64_t l) {
+ return (l << 1) ^ (l >> 63);
+}
+
+/**
+ * Convert n into a zigzag int. This allows negative numbers to be
+ * represented compactly as a varint.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::i32ToZigzag(const int32_t n) {
+ return (n << 1) ^ (n >> 31);
+}
+
+/**
+ * Given a TType value, find the appropriate detail::compact::Types value
+ */
+template <class Transport_>
+int8_t TCompactProtocolT<Transport_>::getCompactType(int8_t ttype) {
+ return detail::compact::TTypeToCType[ttype];
+}
+
+//
+// Reading Methods
+//
+
+/**
+ * Read a message header.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readMessageBegin(
+ std::string& name,
+ TMessageType& messageType,
+ int32_t& seqid) {
+ uint32_t rsize = 0;
+ int8_t protocolId;
+ int8_t versionAndType;
+ int8_t version;
+
+ rsize += readByte(protocolId);
+ if (protocolId != PROTOCOL_ID) {
+ throw TProtocolException(TProtocolException::BAD_VERSION, "Bad protocol identifier");
+ }
+
+ rsize += readByte(versionAndType);
+ version = (int8_t)(versionAndType & VERSION_MASK);
+ if (version != VERSION_N) {
+ throw TProtocolException(TProtocolException::BAD_VERSION, "Bad protocol version");
+ }
+
+ messageType = (TMessageType)((versionAndType >> TYPE_SHIFT_AMOUNT) & 0x03);
+ rsize += readVarint32(seqid);
+ rsize += readString(name);
+
+ return rsize;
+}
+
+/**
+ * Read a struct begin. There's nothing on the wire for this, but it is our
+ * opportunity to push a new struct begin marker on the field stack.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readStructBegin(std::string& name) {
+ name = "";
+ lastField_.push(lastFieldId_);
+ lastFieldId_ = 0;
+ return 0;
+}
+
+/**
+ * Doesn't actually consume any wire data, just removes the last field for
+ * this struct from the field stack.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readStructEnd() {
+ lastFieldId_ = lastField_.top();
+ lastField_.pop();
+ return 0;
+}
+
+/**
+ * Read a field header off the wire.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readFieldBegin(std::string& name,
+ TType& fieldType,
+ int16_t& fieldId) {
+ uint32_t rsize = 0;
+ int8_t byte;
+ int8_t type;
+
+ rsize += readByte(byte);
+ type = (byte & 0x0f);
+
+ // if it's a stop, then we can return immediately, as the struct is over.
+ if (type == T_STOP) {
+ fieldType = T_STOP;
+ fieldId = 0;
+ return rsize;
+ }
+
+ // mask off the 4 MSB of the type header. it could contain a field id delta.
+ int16_t modifier = (int16_t)(((uint8_t)byte & 0xf0) >> 4);
+ if (modifier == 0) {
+ // not a delta, look ahead for the zigzag varint field id.
+ rsize += readI16(fieldId);
+ } else {
+ fieldId = (int16_t)(lastFieldId_ + modifier);
+ }
+ fieldType = getTType(type);
+
+ // if this happens to be a boolean field, the value is encoded in the type
+ if (type == detail::compact::CT_BOOLEAN_TRUE ||
+ type == detail::compact::CT_BOOLEAN_FALSE) {
+ // save the boolean value in a special instance variable.
+ boolValue_.hasBoolValue = true;
+ boolValue_.boolValue =
+ (type == detail::compact::CT_BOOLEAN_TRUE ? true : false);
+ }
+
+ // push the new field onto the field stack so we can keep the deltas going.
+ lastFieldId_ = fieldId;
+ return rsize;
+}
+
+/**
+ * Read a map header off the wire. If the size is zero, skip reading the key
+ * and value type. This means that 0-length maps will yield TMaps without the
+ * "correct" types.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readMapBegin(TType& keyType,
+ TType& valType,
+ uint32_t& size) {
+ uint32_t rsize = 0;
+ int8_t kvType = 0;
+ int32_t msize = 0;
+
+ rsize += readVarint32(msize);
+ if (msize != 0)
+ rsize += readByte(kvType);
+
+ if (msize < 0) {
+ throw TProtocolException(TProtocolException::NEGATIVE_SIZE);
+ } else if (container_limit_ && msize > container_limit_) {
+ throw TProtocolException(TProtocolException::SIZE_LIMIT);
+ }
+
+ keyType = getTType((int8_t)((uint8_t)kvType >> 4));
+ valType = getTType((int8_t)((uint8_t)kvType & 0xf));
+ size = (uint32_t)msize;
+
+ return rsize;
+}
+
+/**
+ * Read a list header off the wire. If the list size is 0-14, the size will
+ * be packed into the element type header. If it's a longer list, the 4 MSB
+ * of the element type header will be 0xF, and a varint will follow with the
+ * true size.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readListBegin(TType& elemType,
+ uint32_t& size) {
+ int8_t size_and_type;
+ uint32_t rsize = 0;
+ int32_t lsize;
+
+ rsize += readByte(size_and_type);
+
+ lsize = ((uint8_t)size_and_type >> 4) & 0x0f;
+ if (lsize == 15) {
+ rsize += readVarint32(lsize);
+ }
+
+ if (lsize < 0) {
+ throw TProtocolException(TProtocolException::NEGATIVE_SIZE);
+ } else if (container_limit_ && lsize > container_limit_) {
+ throw TProtocolException(TProtocolException::SIZE_LIMIT);
+ }
+
+ elemType = getTType((int8_t)(size_and_type & 0x0f));
+ size = (uint32_t)lsize;
+
+ return rsize;
+}
+
+/**
+ * Read a set header off the wire. If the set size is 0-14, the size will
+ * be packed into the element type header. If it's a longer set, the 4 MSB
+ * of the element type header will be 0xF, and a varint will follow with the
+ * true size.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readSetBegin(TType& elemType,
+ uint32_t& size) {
+ return readListBegin(elemType, size);
+}
+
+/**
+ * Read a boolean off the wire. If this is a boolean field, the value should
+ * already have been read during readFieldBegin, so we'll just consume the
+ * pre-stored value. Otherwise, read a byte.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readBool(bool& value) {
+ if (boolValue_.hasBoolValue == true) {
+ value = boolValue_.boolValue;
+ boolValue_.hasBoolValue = false;
+ return 0;
+ } else {
+ int8_t val;
+ readByte(val);
+ value = (val == detail::compact::CT_BOOLEAN_TRUE);
+ return 1;
+ }
+}
+
+/**
+ * Read a single byte off the wire. Nothing interesting here.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readByte(int8_t& byte) {
+ uint8_t b[1];
+ trans_->readAll(b, 1);
+ byte = *(int8_t*)b;
+ return 1;
+}
+
+/**
+ * Read an i16 from the wire as a zigzag varint.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readI16(int16_t& i16) {
+ int32_t value;
+ uint32_t rsize = readVarint32(value);
+ i16 = (int16_t)zigzagToI32(value);
+ return rsize;
+}
+
+/**
+ * Read an i32 from the wire as a zigzag varint.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readI32(int32_t& i32) {
+ int32_t value;
+ uint32_t rsize = readVarint32(value);
+ i32 = zigzagToI32(value);
+ return rsize;
+}
+
+/**
+ * Read an i64 from the wire as a zigzag varint.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readI64(int64_t& i64) {
+ int64_t value;
+ uint32_t rsize = readVarint64(value);
+ i64 = zigzagToI64(value);
+ return rsize;
+}
+
+/**
+ * No magic here - just read a double off the wire.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readDouble(double& dub) {
+ BOOST_STATIC_ASSERT(sizeof(double) == sizeof(uint64_t));
+ BOOST_STATIC_ASSERT(std::numeric_limits<double>::is_iec559);
+
+ uint64_t bits;
+ uint8_t b[8];
+ trans_->readAll(b, 8);
+ bits = *(uint64_t*)b;
+ bits = letohll(bits);
+ dub = bitwise_cast<double>(bits);
+ return 8;
+}
+
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readString(std::string& str) {
+ return readBinary(str);
+}
+
+/**
+ * Read a byte[] from the wire.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readBinary(std::string& str) {
+ int32_t rsize = 0;
+ int32_t size;
+
+ rsize += readVarint32(size);
+ // Catch empty string case
+ if (size == 0) {
+ str = "";
+ return rsize;
+ }
+
+ // Catch error cases
+ if (size < 0) {
+ throw TProtocolException(TProtocolException::NEGATIVE_SIZE);
+ }
+ if (string_limit_ > 0 && size > string_limit_) {
+ throw TProtocolException(TProtocolException::SIZE_LIMIT);
+ }
+
+ // Use the heap here to prevent stack overflow for v. large strings
+ if (size > string_buf_size_ || string_buf_ == NULL) {
+ void* new_string_buf = std::realloc(string_buf_, (uint32_t)size);
+ if (new_string_buf == NULL) {
+ throw TProtocolException(TProtocolException::UNKNOWN, "Out of memory in TCompactProtocol::readString");
+ }
+ string_buf_ = (uint8_t*)new_string_buf;
+ string_buf_size_ = size;
+ }
+ trans_->readAll(string_buf_, size);
+ str.assign((char*)string_buf_, size);
+
+ return rsize + (uint32_t)size;
+}
+
+/**
+ * Read an i32 from the wire as a varint. The MSB of each byte is set
+ * if there is another byte to follow. This can read up to 5 bytes.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readVarint32(int32_t& i32) {
+ int64_t val;
+ uint32_t rsize = readVarint64(val);
+ i32 = (int32_t)val;
+ return rsize;
+}
+
+/**
+ * Read an i64 from the wire as a proper varint. The MSB of each byte is set
+ * if there is another byte to follow. This can read up to 10 bytes.
+ */
+template <class Transport_>
+uint32_t TCompactProtocolT<Transport_>::readVarint64(int64_t& i64) {
+ uint32_t rsize = 0;
+ uint64_t val = 0;
+ int shift = 0;
+ uint8_t buf[10]; // 64 bits / (7 bits/byte) = 10 bytes.
+ uint32_t buf_size = sizeof(buf);
+ const uint8_t* borrowed = trans_->borrow(buf, &buf_size);
+
+ // Fast path.
+ if (borrowed != NULL) {
+ while (true) {
+ uint8_t byte = borrowed[rsize];
+ rsize++;
+ val |= (uint64_t)(byte & 0x7f) << shift;
+ shift += 7;
+ if (!(byte & 0x80)) {
+ i64 = val;
+ trans_->consume(rsize);
+ return rsize;
+ }
+ // Have to check for invalid data so we don't crash.
+ if (UNLIKELY(rsize == sizeof(buf))) {
+ throw TProtocolException(TProtocolException::INVALID_DATA, "Variable-length int over 10 bytes.");
+ }
+ }
+ }
+
+ // Slow path.
+ else {
+ while (true) {
+ uint8_t byte;
+ rsize += trans_->readAll(&byte, 1);
+ val |= (uint64_t)(byte & 0x7f) << shift;
+ shift += 7;
+ if (!(byte & 0x80)) {
+ i64 = val;
+ return rsize;
+ }
+ // Might as well check for invalid data on the slow path too.
+ if (UNLIKELY(rsize >= sizeof(buf))) {
+ throw TProtocolException(TProtocolException::INVALID_DATA, "Variable-length int over 10 bytes.");
+ }
+ }
+ }
+}
+
+/**
+ * Convert from zigzag int to int.
+ */
+template <class Transport_>
+int32_t TCompactProtocolT<Transport_>::zigzagToI32(uint32_t n) {
+ return (n >> 1) ^ -(n & 1);
+}
+
+/**
+ * Convert from zigzag long to long.
+ */
+template <class Transport_>
+int64_t TCompactProtocolT<Transport_>::zigzagToI64(uint64_t n) {
+ return (n >> 1) ^ -(n & 1);
+}
+
+template <class Transport_>
+TType TCompactProtocolT<Transport_>::getTType(int8_t type) {
+ switch (type) {
+ case T_STOP:
+ return T_STOP;
+ case detail::compact::CT_BOOLEAN_FALSE:
+ case detail::compact::CT_BOOLEAN_TRUE:
+ return T_BOOL;
+ case detail::compact::CT_BYTE:
+ return T_BYTE;
+ case detail::compact::CT_I16:
+ return T_I16;
+ case detail::compact::CT_I32:
+ return T_I32;
+ case detail::compact::CT_I64:
+ return T_I64;
+ case detail::compact::CT_DOUBLE:
+ return T_DOUBLE;
+ case detail::compact::CT_BINARY:
+ return T_STRING;
+ case detail::compact::CT_LIST:
+ return T_LIST;
+ case detail::compact::CT_SET:
+ return T_SET;
+ case detail::compact::CT_MAP:
+ return T_MAP;
+ case detail::compact::CT_STRUCT:
+ return T_STRUCT;
+ default:
+ throw TException("don't know what type: " + type);
+ }
+ return T_STOP;
+}
+
+}}} // apache::thrift::protocol
+
+#endif // _THRIFT_PROTOCOL_TCOMPACTPROTOCOL_TCC_