string_limits.h

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#ifndef STRING_LIMITS_H
#define STRING_LIMITS_H
 
#include <QString>
#include <algorithm>
#include <string>

constexpr int MAX_NAME_LENGTH = 0xff;
constexpr int MAX_TEXT_LENGTH = 0xfff;
constexpr int MAX_FILE_LENGTH = 0x1fffff;

inline QString nameFromStdString(const std::string &_string)
{
    return QString::fromUtf8(_string.data(), std::min(int(_string.size()), MAX_NAME_LENGTH));
}

inline QString textFromStdString(const std::string &_string)
{
    return QString::fromUtf8(_string.data(), std::min(int(_string.size()), MAX_TEXT_LENGTH));
}

inline QString textTailFromStdString(const std::string &_string)
{
    if (int(_string.size()) <= MAX_TEXT_LENGTH) {
        return QString::fromUtf8(_string.data(), int(_string.size()));
    }
 
    int start = int(_string.size()) - MAX_TEXT_LENGTH;
    while (start < int(_string.size()) && (static_cast<unsigned char>(_string[start]) & 0xC0) == 0x80) {
        ++start;
    }
    return QString::fromUtf8(_string.data() + start, int(_string.size()) - start);
}

inline QString fileFromStdString(const std::string &_string)
{
    return QString::fromUtf8(_string.data(), std::min(int(_string.size()), MAX_FILE_LENGTH));
}
 
#endif // STRING_LIMITS_H