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MINOR: hpack: provide a function to encode an HTTP scheme

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The new function hpack_encode_scheme() supports encoding a scheme
into the ":scheme" header. It knows about "https" and "http" which use
a single byte, and falls back to literal encoding for other ones.
This commit is contained in:
Willy Tarreau 2018-12-10 19:16:20 +01:00
parent bdabc3a25f
commit 820b391260
1 changed files with 18 additions and 0 deletions
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18
include/common/hpack-enc.h
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@ -219,5 +219,23 @@ static inline int hpack_encode_method(struct buffer *out, enum http_meth_t meth,
return 1; return 1;
} }
/* Tries to encode a :scheme pseudo-header with the scheme in <scheme>, into
* the aligned buffer <out>. Returns non-zero on success or 0 on failure
* (buffer full). Only "http" and "https" are recognized and handled as indexed
* values, others are turned into short literals. The caller is responsible for
* ensuring that the scheme is smaller than 127 bytes, and that the buffer is
* aligned. Normally the compiler will detect constant strings in the comparison
* if the code remains inlined.
*/
static inline int hpack_encode_scheme(struct buffer *out, struct ist scheme)
{
if (out->data < out->size && isteq(scheme, ist("https")))
out->area[out->data++] = 0x87; // indexed field : idx[07]=(":scheme", "https")
else if (out->data < out->size && isteq(scheme, ist("http")))
out->area[out->data++] = 0x86; // indexed field : idx[06]=(":scheme", "http")
else
return hpack_encode_short_idx(out, 6, scheme); // name=":scheme" (idx 6)
return 1;
}
#endif /* _COMMON_HPACK_ENC_H */ #endif /* _COMMON_HPACK_ENC_H */