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#include "mem.h"
#include <util/generic/yexception.h>
TMemoryInput::TMemoryInput() noexcept
: Buf_(nullptr)
, Len_(0)
{
}
TMemoryInput::TMemoryInput(const void* buf, size_t len) noexcept
: Buf_((const char*)buf)
, Len_(len)
{
}
TMemoryInput::TMemoryInput(const TStringBuf buf) noexcept
: Buf_(buf.data())
, Len_(buf.size())
{
}
TMemoryInput::~TMemoryInput() = default;
size_t TMemoryInput::DoNext(const void** ptr, size_t len) {
len = Min(Len_, len);
*ptr = Buf_;
Len_ -= len;
Buf_ += len;
return len;
}
void TMemoryInput::DoUndo(size_t len) {
Len_ += len;
Buf_ -= len;
}
TMemoryOutput::~TMemoryOutput() = default;
size_t TMemoryOutput::DoNext(void** ptr) {
Y_ENSURE(Buf_ < End_, TStringBuf("memory output stream exhausted"));
*ptr = Buf_;
size_t bufferSize = End_ - Buf_;
Buf_ = End_;
return bufferSize;
}
void TMemoryOutput::DoUndo(size_t len) {
Buf_ -= len;
}
void TMemoryOutput::DoWrite(const void* buf, size_t len) {
char* end = Buf_ + len;
Y_ENSURE(end <= End_, TStringBuf("memory output stream exhausted"));
memcpy(Buf_, buf, len);
Buf_ = end;
}
void TMemoryOutput::DoWriteC(char c) {
Y_ENSURE(Buf_ < End_, TStringBuf("memory output stream exhausted"));
*Buf_++ = c;
}
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