gstreamerJSONFactory_helpers.cc

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// gstreamer
#include "gstreamerJSONFactory.h"
 
// Implementation summary:
// Minimal helper used by the JSON plugin to escape keys and string values
// without relying on an external JSON library.
 
std::string GstreamerJsonFactory::jsonEscape(const std::string& s) {
    std::string out;
    out.reserve(s.size() + 8);
 
    for (unsigned char c : s) {
        switch (c) {
        case '\\': out += "\\\\";
            break;
        case '"': out += "\\\"";
            break;
        case '\b': out += "\\b";
            break;
        case '\f': out += "\\f";
            break;
        case '\n': out += "\\n";
            break;
        case '\r': out += "\\r";
            break;
        case '\t': out += "\\t";
            break;
        default:
            // JSON requires control characters below 0x20 to be escaped.
            if (c < 0x20) {
                static const char* hex = "0123456789abcdef";
                out                    += "\\u00";
                out                    += hex[(c >> 4) & 0xF];
                out                    += hex[c & 0xF];
            }
            else {
                out.push_back(static_cast<char>(c));
            }
        }
    }
    return out;
}