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#include "parse_size.h"
#include <util/generic/yexception.h>
#include <util/generic/ylimits.h>
#include <util/string/cast.h>
#include <util/stream/output.h>
namespace {
enum ESuffixShifts {
ESS_KILO_BYTES = 10,
ESS_MEGA_BYTES = 20,
ESS_GIGA_BYTES = 30,
ESS_TERA_BYTES = 40,
};
bool TryShiftValue(ui64& value, ui64 shift) {
if (value > (Max<ui64>() >> shift)) {
return false;
}
value <<= shift;
return true;
}
ui64 ShiftValue(ui64 value, ui64 shift) {
if (!TryShiftValue(value, shift)) {
ythrow yexception() << "value overflow '" << value << " << " << shift << "'";
} else {
return value;
}
}
}
namespace NSize {
ui64 ParseSize(TStringBuf str) {
if (! str.size())
ythrow yexception() << "Wrong size " << str;
char suff = tolower(str[str.size() - 1]);
if (isdigit(suff))
return FromString<ui64>(str);
ui64 shift = 1;
switch (suff) {
case 'k':
shift = ESS_KILO_BYTES;
break;
case 'm':
shift = ESS_MEGA_BYTES;
break;
case 'g':
shift = ESS_GIGA_BYTES;
break;
case 't':
shift = ESS_TERA_BYTES;
break;
default:
ythrow yexception() << "Unknown suffix " << str;
}
ui64 value = FromString<ui64>(str.substr(0, str.size() - 1));
if (!TryShiftValue(value, shift)) {
ythrow yexception() << "Value overflow " << str;
} else {
return value;
}
}
TSize FromKiloBytes(ui64 value) {
return TSize(ShiftValue(value, ESS_KILO_BYTES));
}
TSize FromMegaBytes(ui64 value) {
return TSize(ShiftValue(value, ESS_MEGA_BYTES));
}
TSize FromGigaBytes(ui64 value) {
return TSize(ShiftValue(value, ESS_GIGA_BYTES));
}
TSize FromTeraBytes(ui64 value) {
return TSize(ShiftValue(value, ESS_TERA_BYTES));
}
}
template <>
NSize::TSize FromStringImpl<NSize::TSize>(const char* data, size_t len) {
return NSize::TSize(NSize::ParseSize(TStringBuf(data, len)));
}
template <>
void Out<NSize::TSize>(IOutputStream& os, const NSize::TSize& size) {
os << size.GetValue();
}
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