Function EncodeInteger

src/brpc/details/hpack.cpp:479–496

Encode variant intger and return the size

// Encode variant intger and return the size
inline void EncodeInteger(butil::IOBufAppender* out, uint8_t msb,
                          uint8_t prefix_size, uint32_t value) {
    uint8_t max_prefix_value = (1 << prefix_size) - 1;
    if (value < max_prefix_value) {
        msb |= value;
        out->push_back(msb);
        return;
    }
    value -= max_prefix_value;
    msb |= max_prefix_value;
    out->push_back(msb);
    for (; value >= 128; ) {
        const uint8_t c = (value & 0x7f) | 0x80;
        value >>= 7;
        out->push_back(c);
    }
    out->push_back(static_cast<uint8_t>(value));
}

// Static variables
static HuffmanTree* s_huffman_tree = NULL;