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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vector>
#include <vespa/vespalib/stllike/string.h>
#include <vespa/vespalib/util/array.h>
#include <vespa/vespalib/util/buffer.h>
#include <vespa/vespalib/util/bfloat16.h>
#include "nbo.h"
namespace vespalib {
/**
* Class for streaming data in network byte order, used to serialize
* and deserialize objects. The java code corresponding to the C++
* code using this class will typically use a bytebuffer or a
* GrowableByteBuffer for serialization and deserialization.
*/
class nbostream
{
public:
using Buffer = Array<char>;
using Alloc = alloc::Alloc;
enum State { ok=0, eof=0x01, oob=0x02};
nbostream(size_t initialSize=1024);
protected:
nbostream(const void * buf, size_t sz, bool longLivedBuffer);
public:
nbostream(const void * buf, size_t sz);
nbostream(Alloc && buf, size_t sz);
nbostream(const nbostream & rhs);
nbostream(nbostream && rhs) noexcept;
~nbostream();
nbostream & operator = (const nbostream & rhs);
nbostream & operator = (nbostream && rhs) noexcept;
nbostream & operator << (double v) { double n(nbo::n2h(v)); write8(&n); return *this; }
nbostream & operator >> (double & v) { double n; read8(&n); v = nbo::n2h(n); return *this; }
nbostream & operator << (float v) { float n(nbo::n2h(v)); write4(&n); return *this; }
nbostream & operator >> (float & v) { float n; read4(&n); v = nbo::n2h(n); return *this; }
nbostream & operator << (BFloat16 v) { uint16_t n(nbo::n2h(v.get_bits())); write2(&n); return *this; }
nbostream & operator >> (BFloat16 & v) { uint16_t n; read2(&n); v.assign_bits(nbo::n2h(n)); return *this; }
nbostream & operator << (int64_t v) { int64_t n(nbo::n2h(v)); write8(&n); return *this; }
nbostream & operator >> (int64_t & v) { int64_t n; read8(&n); v = nbo::n2h(n); return *this; }
nbostream & operator << (uint64_t v) { uint64_t n(nbo::n2h(v)); write8(&n); return *this; }
nbostream & operator >> (uint64_t & v) { uint64_t n; read8(&n); v = nbo::n2h(n); return *this; }
nbostream & operator << (int32_t v) { int32_t n(nbo::n2h(v)); write4(&n); return *this; }
nbostream & operator >> (int32_t & v) { int32_t n; read4(&n); v = nbo::n2h(n); return *this; }
nbostream & operator << (uint32_t v) { uint32_t n(nbo::n2h(v)); write4(&n); return *this; }
nbostream & operator >> (uint32_t & v) { uint32_t n; read4(&n); v = nbo::n2h(n); return *this; }
nbostream & operator << (int16_t v) { int16_t n(nbo::n2h(v)); write2(&n); return *this; }
nbostream & operator >> (int16_t & v) { int16_t n; read2(&n); v = nbo::n2h(n); return *this; }
nbostream & operator << (uint16_t v) { uint16_t n(nbo::n2h(v)); write2(&n); return *this; }
nbostream & operator >> (uint16_t & v) { uint16_t n; read2(&n); v = nbo::n2h(n); return *this; }
nbostream & operator << (int8_t v) { write1(&v); return *this; }
nbostream & operator >> (int8_t & v) { read1(&v); return *this; }
nbostream & operator << (uint8_t v) { write1(&v); return *this; }
nbostream & operator >> (uint8_t & v) { read1(&v); return *this; }
nbostream & operator << (char v) { write1(&v); return *this; }
nbostream & operator >> (char & v) { read1(&v); return *this; }
nbostream & operator << (bool v) { write1(&v); return *this; }
nbostream & operator >> (bool & v) { read1(&v); return *this; }
nbostream & operator << (const std::string & v) { uint32_t sz(v.size()); (*this) << sz; write(v.c_str(), sz); return *this; }
nbostream & operator >> (std::string & v) {
uint32_t sz;
(*this) >> sz;
if (__builtin_expect(left() >= sz, true)) {
v.assign(&_rbuf[_rp], sz);
_rp += sz;
} else {
fail(eof);
}
return *this;
}
nbostream & operator << (const char * v) { uint32_t sz(strlen(v)); (*this) << sz; write(v, sz); return *this; }
nbostream & operator << (vespalib::stringref v) { uint32_t sz(v.size()); (*this) << sz; write(v.data(), sz); return *this; }
nbostream & operator << (const vespalib::string & v) { uint32_t sz(v.size()); (*this) << sz; write(v.c_str(), sz); return *this; }
nbostream & operator >> (vespalib::string & v) {
uint32_t sz; (*this) >> sz;
if (__builtin_expect(left() >= sz, true)) {
v.assign(&_rbuf[_rp], sz);
_rp += sz;
} else {
fail(eof);
}
return *this;
}
template <typename T>
nbostream & operator << (const std::vector<T> & v) {
uint32_t sz(v.size());
(*this) << sz;
for(size_t i(0); i < sz; i++) {
(*this) << v[i];
}
return *this;
}
template <typename T>
nbostream & operator >> (std::vector<T> & v) {
uint32_t sz;
(*this) >> sz;
v.resize(sz);
for(size_t i(0); i < sz; i++) {
(*this) >> v[i];
}
return *this;
}
template <typename T, typename U>
nbostream &
operator<<(const std::pair<T, U> &val)
{
*this << val.first << val.second;
return *this;
}
template <typename T, typename U>
nbostream &
operator>>(std::pair<T, U> &val)
{
*this >> val.first >> val.second;
return *this;
}
size_t size() const { return left(); }
size_t capacity() const { return _wbuf.size(); }
bool empty() const { return size() == 0; }
const char * data() const { return &_rbuf[0]; }
const char * peek() const { return _rbuf.c_str() + _rp; }
size_t rp() const { return _rp; }
nbostream & rp(size_t pos) { if (pos > _wp) fail(eof); _rp = pos; return *this; }
nbostream & wp(size_t pos) { if (pos > _wbuf.size()) fail(oob); _wp = pos; return *this; }
size_t wp() const { return _wp; }
State state() const { return _state; }
bool good() const { return _state == ok; }
void clear() { _wbuf.clear(); _wp = _rp = 0; _state = ok; }
void adjustReadPos(ssize_t adj) { size_t npos = _rp + adj; if (__builtin_expect(npos > _wp, false)) { fail(eof); } _rp = npos; }
friend std::ostream & operator << (std::ostream & os, const nbostream & s);
void write(const void *v, size_t sz) {
if (__builtin_expect(space() < sz, false)) {
extend(sz);
}
if (sz > 0) {
memcpy(&_wbuf[_wp], v, sz);
}
_wp += sz;
}
void read(void *v, size_t sz) {
if (__builtin_expect(left() >= sz, true)) {
memcpy(v, &_rbuf[_rp], sz);
_rp += sz;
} else {
memset(v, 0, sz);
fail(eof);
}
}
void swap(Buffer & buf);
void swap(nbostream & os);
/**
* This flag can be used to tell that a buffer will live at least as long as
* any objects it will be the backing for. In those cases there is no need for
* client to make a copy of the buffer content. Use it care and in environments
* you have full control over.
*
*/
bool isLongLivedBuffer() const { return _longLivedBuffer; }
void reserve(size_t sz);
void putInt1_4Bytes(uint32_t val) {
if (val < 0x80) {
*this << static_cast<uint8_t>(val);
} else {
*this << (val | 0x80000000);
}
}
template <typename T>
T readValue() {
T val;
*this >> val;
return val;
}
uint32_t getInt1_4Bytes() {
char first_byte = *peek();
if (!(first_byte & 0x80)) {
return readValue<uint8_t>();
} else {
return readValue<uint32_t>() & 0x7fffffff;
}
}
void writeSmallString(vespalib::stringref value) {
putInt1_4Bytes(value.size());
write(value.data(), value.size());
}
void readSmallString(vespalib::string &value) {
size_t strSize = getInt1_4Bytes();
const char *cstr = peek();
value.assign(cstr, strSize);
adjustReadPos(strSize);
}
private:
void read1(void *v) { read(v, 1); }
void read2(void *v) { read(v, 2); }
void read4(void *v) { read(v, 4); }
void read8(void *v) { read(v, 8); }
void write1(const void *v) { write(v, 1); }
void write2(const void *v) { write(v, 2); }
void write4(const void *v) { write(v, 4); }
void write8(const void *v) { write(v, 8); }
void fail(State s);
size_t left() const { return _wp - _rp; }
size_t space() const { return _wbuf.size() - _wp; }
void compact();
void extend(size_t newSize);
Buffer _wbuf;
ConstBufferRef _rbuf;
size_t _rp;
size_t _wp;
State _state;
bool _longLivedBuffer;
};
class nbostream_longlivedbuf : public nbostream {
public:
nbostream_longlivedbuf(size_t initialSize=1024);
nbostream_longlivedbuf(const void * buf, size_t sz);
};
}
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