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/*
* Copyright (C) 2017 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.
*/
#ifndef HIDUTIL_STREAM_IO_UTIL_H_
#define HIDUTIL_STREAM_IO_UTIL_H_
#include "HidLog.h"
#include <istream>
#include <iomanip>
#include <sstream>
#include <vector>
#include <cassert>
namespace HidUtil {
template<typename CharT>
class charvectorbuf : public std::streambuf { // class name is consistent with std lib
static_assert(std::is_const<CharT>::value == false, "cannot use const type");
public:
// r/w buffer constructors
charvectorbuf(std::vector<CharT> &vec) {
init(vec.data(), vec.size());
}
charvectorbuf(CharT *begin, CharT *end) {
assert(end >= begin);
init(begin, end - begin);
}
charvectorbuf(CharT *begin, size_t size) {
init(begin, size);
}
// r/o buffer constructor
charvectorbuf(const std::vector<CharT> &vec) {
init(vec.data(), vec.size());
}
charvectorbuf(const CharT *begin, const CharT *end) {
assert(end >= begin);
init(begin, end - begin);
}
charvectorbuf(const CharT *begin, size_t size) {
init(begin, size);
}
protected:
virtual std::streampos seekpos(
std::streampos sp, std::ios_base::openmode which =
std::ios_base::in | std::ios_base::out) override {
return seekoff(std::streamoff(sp), std::ios_base::beg, which);
}
// this is needed to use ftell() on stream
virtual std::streampos seekoff(
std::streamoff off, std::ios_base::seekdir way,
std::ios_base::openmode which =
std::ios_base::in | std::ios_base::out) override {
// pptr() == nullptr: read-only
assert(pptr() == nullptr || egptr() - eback() == epptr() - pbase());
bool in = which & std::ios_base::in;
bool out = which & std::ios_base::out;
pos_type end = egptr() - eback();
if (!in && !out) {
return pos_type(-1);
}
if (in && out && way == std::ios_base::cur) {
return pos_type(-1);
}
off_type noff;
switch (way) {
case std::ios_base::beg:
noff = 0;
break;
case std::ios_base::cur:
if (in) {
noff = gptr() - eback();
} else {
noff = pptr() - pbase();
}
break;
case std::ios_base::end:
noff = end;
break;
default:
return pos_type(-1);
}
noff += off;
if (noff < 0 || noff > end) {
return pos_type(-1);
}
if (noff != 0 && ((in && gptr() == nullptr) || (out && pptr() == nullptr))) {
return pos_type(-1);
}
if (in) {
setg(eback(), eback() + noff, egptr());
}
if (out) {
setp(pbase(), epptr());
pbump(noff);
}
return pos_type(noff);
}
private:
// read only buffer init
void init(const CharT *base, size_t size) {
setg((char*)base, (char*)base, (char*)(base + size));
}
// read write buffer init
void init(CharT *base, size_t size) {
setg((char*)base, (char*)base, (char*)(base + size));
setp((char*)base, (char*)(base + size));
}
};
// dump binary values
template <class ForwardIterator>
void hexdumpToStream(std::ostream &os, const ForwardIterator &first, const ForwardIterator &last) {
static_assert(
std::is_convertible<
typename std::iterator_traits<ForwardIterator>::iterator_category,
std::forward_iterator_tag>::value
&& std::is_convertible<
typename std::iterator_traits<ForwardIterator>::value_type,
unsigned char>::value
&& sizeof(typename std::iterator_traits<ForwardIterator>::value_type)
== sizeof(unsigned char),
"Only accepts forward iterator of a type of size 1 "
"that can be convert to unsigned char.\n");
size_t c = 0;
std::ostringstream ss;
for (ForwardIterator i = first; i != last; ++i, ++c) {
unsigned char v = *i;
// formatting
switch (c & 0xf) {
case 0:
// address
os << ss.str() << LOG_ENDL;
ss.str("");
ss << std::hex;
ss << std::setfill('0') << std::setw(4) << c << ": ";
break;
case 8:
// space
ss << " ";
break;
}
ss << std::setfill('0') << std::setw(2)
<< static_cast<unsigned>(static_cast<unsigned char>(v)) << " ";
}
os << ss.str() << LOG_ENDL;
}
} //namespace HidUtil
#endif // HIDUTIL_STREAM_IO_UTIL_H_
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