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62 lines
1.3 KiB
62 lines
1.3 KiB
3 months ago
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/*
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* UCW Library: Reading and writing Varints on Fastbuf Streams
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*
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* (c) 2013 Tomas Valla <tom@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#ifndef _UCW_FF_VARINT_H
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#define _UCW_FF_VARINT_H
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#include <ucw/fastbuf.h>
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#include <ucw/varint.h>
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#ifdef CONFIG_UCW_CLEAN_ABI
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#define bget_varint_slow ucw_bget_varint_slow
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#define bput_varint_slow ucw_bput_varint_slow
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#endif
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u64 bget_varint_slow(struct fastbuf *b, u64 repl);
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void bput_varint_slow(struct fastbuf *b, u64 u);
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/**
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* Reads u64 encoded as varint from the fastbuf b.
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* If the read is unsuccessful, returns repl.
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**/
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static inline u64 bget_varint_repl(struct fastbuf *b, u64 repl)
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{
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uint l;
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if (bavailr(b) >= 1) {
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l = varint_len(*b->bptr);
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if (bavailr(b) >= l) {
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varint_get(b->bptr, &repl);
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b->bptr += l;
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return repl;
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}
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}
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return bget_varint_slow(b, repl);
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}
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/**
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* Reads u64 encoded as varint from the fastbuf b.
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* If the read is unsuccessful, returns ~0LLU.
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**/
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static inline u64 bget_varint(struct fastbuf *b)
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{
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return bget_varint_repl(b, ~0LLU);
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}
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/** Writes u64 u encoded as varint to the fastbuf b. **/
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static inline void bput_varint(struct fastbuf *b, u64 u)
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{
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uint l = varint_space(u);
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if (bavailw(b) >= l)
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b->bptr += varint_put(b->bptr, u);
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else
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bput_varint_slow(b, u);
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}
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#endif
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