#include "string_reader.h"

StringReader::StringReader(const std::string &s)
    : in(s)
{}

StringReader::~StringReader() = default;

int StringReader::readByte() {
    char c;
    if (!in.get(c)) return -1;
    return static_cast<unsigned char>(c);
}

bool StringReader::readBytes(uint8_t* buf, size_t len) {
    in.read(reinterpret_cast<char*>(buf), static_cast<std::streamsize>(len));
    return static_cast<size_t>(in.gcount()) == len;
}

std::string StringReader::readString(size_t len) {
    std::string s;
    s.resize(len);
    in.read(reinterpret_cast<char*>(&s[0]), static_cast<std::streamsize>(len));
    std::streamsize got = in.gcount();
    if (static_cast<size_t>(got) < len) s.resize(static_cast<size_t>(got));
    return s;
}

std::string StringReader::readLine() {
    std::string s;
    if (!std::getline(in, s)) return std::string();
    return s;
}