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#include "varint.h"
#include "zigzag.h"
#include <util/generic/yexception.h>
#include <util/generic/ylimits.h>
namespace NYson {
////////////////////////////////////////////////////////////////////////////////
int WriteVarUInt64(IOutputStream* output, ui64 value) {
bool stop = false;
int bytesWritten = 0;
while (!stop) {
++bytesWritten;
ui8 byte = static_cast<ui8>(value | 0x80);
value >>= 7;
if (value == 0) {
stop = true;
byte &= 0x7F;
}
output->Write(byte);
}
return bytesWritten;
}
int WriteVarInt32(IOutputStream* output, i32 value) {
return WriteVarUInt64(output, static_cast<ui64>(ZigZagEncode32(value)));
}
int WriteVarInt64(IOutputStream* output, i64 value) {
return WriteVarUInt64(output, static_cast<ui64>(ZigZagEncode64(value)));
}
int ReadVarUInt64(IInputStream* input, ui64* value) {
size_t count = 0;
ui64 result = 0;
ui8 byte = 0;
do {
if (7 * count > 8 * sizeof(ui64)) {
ythrow yexception() << "The data is too long to read ui64";
}
if (input->Read(&byte, 1) != 1) {
ythrow yexception() << "The data is too short to read ui64";
}
result |= (static_cast<ui64>(byte & 0x7F)) << (7 * count);
++count;
} while (byte & 0x80);
*value = result;
return count;
}
int ReadVarInt32(IInputStream* input, i32* value) {
ui64 varInt;
int bytesRead = ReadVarUInt64(input, &varInt);
if (varInt > Max<ui32>()) {
ythrow yexception() << "The data is too long to read i32";
}
*value = ZigZagDecode32(static_cast<ui32>(varInt));
return bytesRead;
}
int ReadVarInt64(IInputStream* input, i64* value) {
ui64 varInt;
int bytesRead = ReadVarUInt64(input, &varInt);
*value = ZigZagDecode64(varInt);
return bytesRead;
}
} // namespace NYson
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