diff options
Diffstat (limited to 'grpc/third_party/upb/upb/pb/varint.int.h')
| -rw-r--r-- | grpc/third_party/upb/upb/pb/varint.int.h | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/grpc/third_party/upb/upb/pb/varint.int.h b/grpc/third_party/upb/upb/pb/varint.int.h deleted file mode 100644 index 9b98a81c..00000000 --- a/grpc/third_party/upb/upb/pb/varint.int.h +++ /dev/null @@ -1,164 +0,0 @@ -/* -** A number of routines for varint manipulation (we keep them all around to -** have multiple approaches available for benchmarking). -*/ - -#ifndef UPB_VARINT_DECODER_H_ -#define UPB_VARINT_DECODER_H_ - -#include <assert.h> -#include <stdint.h> -#include <string.h> -#include "upb/upb.h" - -#include "upb/port_def.inc" - -#ifdef __cplusplus -extern "C" { -#endif - -#define UPB_MAX_WIRE_TYPE 5 - -/* The maximum number of bytes that it takes to encode a 64-bit varint. */ -#define UPB_PB_VARINT_MAX_LEN 10 - -/* Array of the "native" (ie. non-packed-repeated) wire type for the given a - * descriptor type (upb_descriptortype_t). */ -extern const uint8_t upb_pb_native_wire_types[]; - -UPB_INLINE uint64_t byteswap64(uint64_t val) { - uint64_t byte = 0xff; - return (val & (byte << 56) >> 56) - | (val & (byte << 48) >> 40) - | (val & (byte << 40) >> 24) - | (val & (byte << 32) >> 8) - | (val & (byte << 24) << 8) - | (val & (byte << 16) << 24) - | (val & (byte << 8) << 40) - | (val & (byte << 0) << 56); -} - -/* Zig-zag encoding/decoding **************************************************/ - -UPB_INLINE int32_t upb_zzdec_32(uint64_t _n) { - uint32_t n = (uint32_t)_n; - return (n >> 1) ^ -(int32_t)(n & 1); -} -UPB_INLINE int64_t upb_zzdec_64(uint64_t n) { - return (n >> 1) ^ -(int64_t)(n & 1); -} -UPB_INLINE uint32_t upb_zzenc_32(int32_t n) { - return ((uint32_t)n << 1) ^ (n >> 31); -} -UPB_INLINE uint64_t upb_zzenc_64(int64_t n) { - return ((uint64_t)n << 1) ^ (n >> 63); -} - -/* Decoding *******************************************************************/ - -/* All decoding functions return this struct by value. */ -typedef struct { - const char *p; /* NULL if the varint was unterminated. */ - uint64_t val; -} upb_decoderet; - -UPB_INLINE upb_decoderet upb_decoderet_make(const char *p, uint64_t val) { - upb_decoderet ret; - ret.p = p; - ret.val = val; - return ret; -} - -upb_decoderet upb_vdecode_max8_branch32(upb_decoderet r); -upb_decoderet upb_vdecode_max8_branch64(upb_decoderet r); - -/* Template for a function that checks the first two bytes with branching - * and dispatches 2-10 bytes with a separate function. Note that this may read - * up to 10 bytes, so it must not be used unless there are at least ten bytes - * left in the buffer! */ -#define UPB_VARINT_DECODER_CHECK2(name, decode_max8_function) \ -UPB_INLINE upb_decoderet upb_vdecode_check2_ ## name(const char *_p) { \ - uint8_t *p = (uint8_t*)_p; \ - upb_decoderet r; \ - if ((*p & 0x80) == 0) { \ - /* Common case: one-byte varint. */ \ - return upb_decoderet_make(_p + 1, *p & 0x7fU); \ - } \ - r = upb_decoderet_make(_p + 2, (*p & 0x7fU) | ((*(p + 1) & 0x7fU) << 7)); \ - if ((*(p + 1) & 0x80) == 0) { \ - /* Two-byte varint. */ \ - return r; \ - } \ - /* Longer varint, fallback to out-of-line function. */ \ - return decode_max8_function(r); \ -} - -UPB_VARINT_DECODER_CHECK2(branch32, upb_vdecode_max8_branch32) -UPB_VARINT_DECODER_CHECK2(branch64, upb_vdecode_max8_branch64) -#undef UPB_VARINT_DECODER_CHECK2 - -/* Our canonical functions for decoding varints, based on the currently - * favored best-performing implementations. */ -UPB_INLINE upb_decoderet upb_vdecode_fast(const char *p) { - if (sizeof(long) == 8) - return upb_vdecode_check2_branch64(p); - else - return upb_vdecode_check2_branch32(p); -} - - -/* Encoding *******************************************************************/ - -UPB_INLINE int upb_value_size(uint64_t val) { -#ifdef __GNUC__ - /* 0-based, undef if val == 0. */ - int high_bit = val ? 63 - __builtin_clzll(val) : 0; -#else - int high_bit = 0; - uint64_t tmp = val; - while(tmp >>= 1) high_bit++; -#endif - return val == 0 ? 1 : high_bit / 8 + 1; -} - -/* Encodes a 64-bit varint into buf (which must be >=UPB_PB_VARINT_MAX_LEN - * bytes long), returning how many bytes were used. - * - * TODO: benchmark and optimize if necessary. */ -UPB_INLINE size_t upb_vencode64(uint64_t val, char *buf) { - size_t i; - if (val == 0) { buf[0] = 0; return 1; } - i = 0; - while (val) { - uint8_t byte = val & 0x7fU; - val >>= 7; - if (val) byte |= 0x80U; - buf[i++] = byte; - } - return i; -} - -UPB_INLINE size_t upb_varint_size(uint64_t val) { - char buf[UPB_PB_VARINT_MAX_LEN]; - return upb_vencode64(val, buf); -} - -/* Encodes a 32-bit varint, *not* sign-extended. */ -UPB_INLINE uint64_t upb_vencode32(uint32_t val) { - char buf[UPB_PB_VARINT_MAX_LEN]; - size_t bytes = upb_vencode64(val, buf); - uint64_t ret = 0; - UPB_ASSERT(bytes <= 5); - memcpy(&ret, buf, bytes); - ret = _upb_be_swap64(ret); - UPB_ASSERT(ret <= 0xffffffffffU); - return ret; -} - -#ifdef __cplusplus -} /* extern "C" */ -#endif - -#include "upb/port_undef.inc" - -#endif /* UPB_VARINT_DECODER_H_ */ |