FORCEINLINE uint64_t upb_decode_varint(upb_decoder *d) {
if (upb_decoder_bufleft(d) >= 10) {
// Fast case.
upb_decoderet r = upb_vdecode_fast(d->ptr);
if (r.p == NULL) upb_decoder_abortjmp(d, "Unterminated varint");
upb_decoder_advance(d, r.p - d->ptr);
return r.val;
} else if (upb_decoder_bufleft(d) > 0) {
// Intermediate case -- worth it?
char tmpbuf[10];
memset(tmpbuf, 0x80, 10);
memcpy(tmpbuf, d->ptr, upb_decoder_bufleft(d));
upb_decoderet r = upb_vdecode_fast(tmpbuf);
if (r.p != NULL) {
upb_decoder_advance(d, r.p - tmpbuf);
return r.val;
}
}
// Slow case -- varint spans buffer seam.
return upb_decode_varint_slow(d);
}
// Decodes a varint from the current buffer position.
// Returns a status code as described in decoder.int.h.
FORCEINLINE int32_t decode_varint(upb_pbdecoder *d, uint64_t *u64) {
if (curbufleft(d) > 0 && !(*d->ptr & 0x80)) {
*u64 = *d->ptr;
advance(d, 1);
return DECODE_OK;
} else if (curbufleft(d) >= 10) {
// Fast case.
upb_decoderet r = upb_vdecode_fast(d->ptr);
if (r.p == NULL) {
seterr(d, kUnterminatedVarint);
return upb_pbdecoder_suspend(d);
}
advance(d, r.p - d->ptr);
*u64 = r.val;
return DECODE_OK;
} else {
// Slow case -- varint spans buffer seam.
return upb_pbdecoder_decode_varint_slow(d, u64);
}
}
