1 #ifndef PROTOZERO_VARINT_HPP
2 #define PROTOZERO_VARINT_HPP
33 inline uint64_t decode_varint_impl(
const char** data,
const char* end) {
34 const auto begin =
reinterpret_cast<const int8_t*
>(*data);
35 const auto iend =
reinterpret_cast<const int8_t*
>(end);
36 const int8_t* p = begin;
42 b = *p++; val = ((uint64_t(b) & 0x7fu) );
if (b >= 0) {
break; }
43 b = *p++; val |= ((uint64_t(b) & 0x7fu) << 7u);
if (b >= 0) {
break; }
44 b = *p++; val |= ((uint64_t(b) & 0x7fu) << 14u);
if (b >= 0) {
break; }
45 b = *p++; val |= ((uint64_t(b) & 0x7fu) << 21u);
if (b >= 0) {
break; }
46 b = *p++; val |= ((uint64_t(b) & 0x7fu) << 28u);
if (b >= 0) {
break; }
47 b = *p++; val |= ((uint64_t(b) & 0x7fu) << 35u);
if (b >= 0) {
break; }
48 b = *p++; val |= ((uint64_t(b) & 0x7fu) << 42u);
if (b >= 0) {
break; }
49 b = *p++; val |= ((uint64_t(b) & 0x7fu) << 49u);
if (b >= 0) {
break; }
50 b = *p++; val |= ((uint64_t(b) & 0x7fu) << 56u);
if (b >= 0) {
break; }
51 b = *p++; val |= ((uint64_t(b) & 0x01u) << 63u);
if (b >= 0) {
break; }
55 unsigned int shift = 0;
56 while (p != iend && *p < 0) {
57 val |= (uint64_t(*p++) & 0x7fu) << shift;
63 val |= uint64_t(*p++) << shift;
66 *data =
reinterpret_cast<const char*
>(p);
91 if (end != *data && ((
static_cast<uint64_t
>(**data) & 0x80u) == 0)) {
92 const auto val =
static_cast<uint64_t
>(**data);
97 return detail::decode_varint_impl(data, end);
113 const auto begin =
reinterpret_cast<const int8_t*
>(*data);
114 const auto iend =
reinterpret_cast<const int8_t*
>(end);
115 const int8_t* p = begin;
117 while (p != iend && *p < 0) {
131 *data =
reinterpret_cast<const char*
>(p);
144 template <
typename T>
148 while (value >= 0x80u) {
149 *data++ = char((value & 0x7fu) | 0x80u);
153 *data++ = char(value);
167 while (value >= 0x80u) {
179 return (
static_cast<uint32_t
>(value) << 1u) ^
static_cast<uint32_t
>(-
static_cast<int32_t
>(
static_cast<uint32_t
>(value) >> 31u));
186 return (
static_cast<uint64_t
>(value) << 1u) ^
static_cast<uint64_t
>(-
static_cast<int64_t
>(
static_cast<uint64_t
>(value) >> 63u));
193 return static_cast<int32_t
>((value >> 1u) ^
static_cast<uint32_t
>(-
static_cast<int32_t
>(value & 1u)));
200 return static_cast<int64_t
>((value >> 1u) ^
static_cast<uint64_t
>(-
static_cast<int64_t
>(value & 1u)));
205 #endif // PROTOZERO_VARINT_HPP