Function put_varint

internal/cbm/sqlite_writer.c:187–209

// --- Varint encoding ---

static int put_varint(uint8_t *buf, int64_t value) {
    uint64_t v = (uint64_t)value;
    if (v <= VARINT_MASK) {
        buf[0] = (uint8_t)v;
        return SERIAL_SIZE_INT8;
    }
    // Encode in big-endian with MSB continuation bits
    uint8_t tmp[VARINT_BUF_SIZE];
    int n = 0;
    while (v > VARINT_MASK) {
        tmp[n++] = (uint8_t)(v & VARINT_MASK);
        v >>= VARINT_SHIFT;
    }
    tmp[n++] = (uint8_t)v;
    // Reverse into output with continuation bits
    for (int i = 0; i < n; i++) {
        buf[i] = tmp[n - SKIP_ONE - i];
        if (i < n - SKIP_ONE) {
            buf[i] |= VARINT_CONTINUE;
        }
    }
    return n;
}

static int varint_len(int64_t value) {
    uint64_t v = (uint64_t)value;