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#ifndef VARINT_INL_H_
#error "Direct inclusion of this file is not allowed, include varint.h"
// For the sake of sane code completion.
#include "varint.h"
#endif
#include "zig_zag.h"
namespace NYT {
////////////////////////////////////////////////////////////////////////////////
template <class TWriteCallback>
Y_FORCE_INLINE int WriteVarUint64Impl(TWriteCallback doWrite, 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;
}
doWrite(byte);
}
return bytesWritten;
}
// These are optimized versions of these Read/Write functions in protobuf/io/coded_stream.cc.
Y_FORCE_INLINE int WriteVarUint64(IOutputStream* output, ui64 value)
{
return WriteVarUint64Impl([&] (ui8 byte) {
output->Write(byte);
}, value);
}
Y_FORCE_INLINE int WriteVarUint64(char* output, ui64 value)
{
return WriteVarUint64Impl([&] (ui8 byte) {
*output++ = byte;
}, value);
}
////////////////////////////////////////////////////////////////////////////////
template <class TOutput>
Y_FORCE_INLINE int WriteVarUint32Impl(TOutput output, ui32 value)
{
return WriteVarUint64(output, static_cast<ui64>(value));
}
Y_FORCE_INLINE int WriteVarUint32(IOutputStream* output, ui32 value)
{
return WriteVarUint32Impl(output, value);
}
Y_FORCE_INLINE int WriteVarUint32(char* output, ui32 value)
{
return WriteVarUint32Impl(output, value);
}
////////////////////////////////////////////////////////////////////////////////
template <class TOutput>
Y_FORCE_INLINE int WriteVarInt32Impl(TOutput output, i32 value)
{
return WriteVarUint64(output, static_cast<ui64>(ZigZagEncode32(value)));
}
Y_FORCE_INLINE int WriteVarInt32(IOutputStream* output, i32 value)
{
return WriteVarInt32Impl(output, value);
}
Y_FORCE_INLINE int WriteVarInt32(char* output, i32 value)
{
return WriteVarInt32Impl(output, value);
}
////////////////////////////////////////////////////////////////////////////////
template <class TOutput>
Y_FORCE_INLINE int WriteVarInt64Impl(TOutput output, i64 value)
{
return WriteVarUint64(output, static_cast<ui64>(ZigZagEncode64(value)));
}
Y_FORCE_INLINE int WriteVarInt64(IOutputStream* output, i64 value)
{
return WriteVarInt64Impl(output, value);
}
Y_FORCE_INLINE int WriteVarInt64(char* output, i64 value)
{
return WriteVarInt64Impl(output, value);
}
////////////////////////////////////////////////////////////////////////////////
template <class TReadCallback>
Y_FORCE_INLINE int ReadVarUint64Impl(TReadCallback doRead, ui64* value)
{
size_t count = 0;
ui64 result = 0;
ui8 byte;
do {
if (7 * count > 8 * sizeof(ui64) ) {
throw TSimpleException("Value is too big for varuint64");
}
byte = doRead();
result |= (static_cast<ui64> (byte & 0x7F)) << (7 * count);
++count;
} while (byte & 0x80);
*value = result;
return count;
}
Y_FORCE_INLINE int ReadVarUint64(IInputStream* input, ui64* value)
{
return ReadVarUint64Impl([&] () {
char byte;
if (input->Read(&byte, 1) != 1) {
throw TSimpleException("Premature end of stream while reading varuint64");
}
return byte;
}, value);
}
Y_FORCE_INLINE int ReadVarUint64(const char* input, ui64* value)
{
return ReadVarUint64Impl([&] () {
char byte = *input;
++input;
return byte;
}, value);
}
Y_FORCE_INLINE int ReadVarUint64(const char* input, const char* end, ui64* value)
{
return ReadVarUint64Impl([&] () {
if (input == end) {
throw TSimpleException("Premature end of data while reading varuint64");
}
char byte = *input;
++input;
return byte;
}, value);
}
////////////////////////////////////////////////////////////////////////////////
template <class... Args>
Y_FORCE_INLINE int ReadVarUint32Impl(ui32* value, Args... args)
{
ui64 varInt;
int bytesRead = ReadVarUint64(args..., &varInt);
if (varInt > std::numeric_limits<ui32>::max()) {
throw TSimpleException("Value is too big for varuint32");
}
*value = static_cast<ui32>(varInt);
return bytesRead;
}
Y_FORCE_INLINE int ReadVarUint32(IInputStream* input, ui32* value)
{
return ReadVarUint32Impl(value, input);
}
Y_FORCE_INLINE int ReadVarUint32(const char* input, ui32* value)
{
return ReadVarUint32Impl(value, input);
}
Y_FORCE_INLINE int ReadVarUint32(const char* input, const char* end, ui32* value)
{
return ReadVarUint32Impl(value, input, end);
}
////////////////////////////////////////////////////////////////////////////////
template <class... Args>
Y_FORCE_INLINE int ReadVarInt32Impl(i32* value, Args... args)
{
ui64 varInt;
int bytesRead = ReadVarUint64(args..., &varInt);
if (varInt > std::numeric_limits<ui32>::max()) {
throw TSimpleException("Value is too big for varint32");
}
*value = ZigZagDecode32(static_cast<ui32>(varInt));
return bytesRead;
}
Y_FORCE_INLINE int ReadVarInt32(IInputStream* input, i32* value)
{
return ReadVarInt32Impl(value, input);
}
Y_FORCE_INLINE int ReadVarInt32(const char* input, i32* value)
{
return ReadVarInt32Impl(value, input);
}
Y_FORCE_INLINE int ReadVarInt32(const char* input, const char* end, i32* value)
{
return ReadVarInt32Impl(value, input, end);
}
////////////////////////////////////////////////////////////////////////////////
template <class... Args>
Y_FORCE_INLINE int ReadVarInt64Impl(i64* value, Args... args)
{
ui64 varInt;
int bytesRead = ReadVarUint64(args..., &varInt);
*value = ZigZagDecode64(varInt);
return bytesRead;
}
Y_FORCE_INLINE int ReadVarInt64(IInputStream* input, i64* value)
{
return ReadVarInt64Impl(value, input);
}
Y_FORCE_INLINE int ReadVarInt64(const char* input, i64* value)
{
return ReadVarInt64Impl(value, input);
}
Y_FORCE_INLINE int ReadVarInt64(const char* input, const char* end, i64* value)
{
return ReadVarInt64Impl(value, input, end);
}
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT
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