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// Copyright 2012 Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of Google Inc. nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "utils/units.hpp"
extern "C" {
#include <stdint.h>
}
#include <stdexcept>
#include "utils/format/macros.hpp"
#include "utils/text/exceptions.hpp"
#include "utils/text/operations.ipp"
namespace units = utils::units;
/// Constructs a zero bytes quantity.
units::bytes::bytes(void) :
_count(0)
{
}
/// Constructs an arbitrary bytes quantity.
///
/// \param count_ The amount of bytes in the quantity.
units::bytes::bytes(const uint64_t count_) :
_count(count_)
{
}
/// Parses a string into a bytes quantity.
///
/// \param in_str The user-provided string to be converted.
///
/// \return The converted bytes quantity.
///
/// \throw std::runtime_error If the input string is empty or invalid.
units::bytes
units::bytes::parse(const std::string& in_str)
{
if (in_str.empty())
throw std::runtime_error("Bytes quantity cannot be empty");
uint64_t multiplier;
std::string str = in_str;
{
const char unit = str[str.length() - 1];
switch (unit) {
case 'T': case 't': multiplier = TB; break;
case 'G': case 'g': multiplier = GB; break;
case 'M': case 'm': multiplier = MB; break;
case 'K': case 'k': multiplier = KB; break;
default: multiplier = 1;
}
if (multiplier != 1)
str.erase(str.length() - 1);
}
if (str.empty())
throw std::runtime_error("Bytes quantity cannot be empty");
if (str[0] == '.' || str[str.length() - 1] == '.') {
// The standard parser for float values accepts things like ".3" and
// "3.", which means that we would interpret ".3K" and "3.K" as valid
// quantities. I think this is ugly and should not be allowed, so
// special-case this condition and just error out.
throw std::runtime_error(F("Invalid bytes quantity '%s'") % in_str);
}
double count;
try {
count = text::to_type< double >(str);
} catch (const text::value_error& e) {
throw std::runtime_error(F("Invalid bytes quantity '%s'") % in_str);
}
return bytes(uint64_t(count * multiplier));
}
/// Formats a bytes quantity for user consumption.
///
/// \return A textual representation of the bytes quantiy.
std::string
units::bytes::format(void) const
{
if (_count >= TB) {
return F("%.2sT") % (static_cast< float >(_count) / TB);
} else if (_count >= GB) {
return F("%.2sG") % (static_cast< float >(_count) / GB);
} else if (_count >= MB) {
return F("%.2sM") % (static_cast< float >(_count) / MB);
} else if (_count >= KB) {
return F("%.2sK") % (static_cast< float >(_count) / KB);
} else {
return F("%s") % _count;
}
}
/// Implicit conversion to an integral representation.
units::bytes::operator uint64_t(void) const
{
return _count;
}
/// Extracts a bytes quantity from a stream.
///
/// \param input The stream from which to read a single word representing the
/// bytes quantity.
/// \param rhs The variable into which to store the parsed value.
///
/// \return The input stream.
///
/// \post The bad bit of input is set to 1 if the parsing failed.
std::istream&
units::operator>>(std::istream& input, bytes& rhs)
{
std::string word;
input >> word;
if (input.good() || input.eof()) {
try {
rhs = bytes::parse(word);
} catch (const std::runtime_error& e) {
input.setstate(std::ios::badbit);
}
}
return input;
}
/// Injects a bytes quantity into a stream.
///
/// \param output The stream into which to inject the bytes quantity as a
/// user-readable string.
/// \param rhs The bytes quantity to format.
///
/// \return The output stream.
std::ostream&
units::operator<<(std::ostream& output, const bytes& rhs)
{
return (output << rhs.format());
}
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