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

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The new function hpack_encode_path() supports encoding a path into
the ":path" header. It knows about "/" and "/index.html" which use
a single byte, and falls back to literal encoding for other ones,
with a fast path for short paths < 127 bytes.
This commit is contained in:
Willy Tarreau 2018-12-10 19:26:51 +01:00
parent 7561bcbb36
commit eaeeb68f23
1 changed files with 21 additions and 0 deletions
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21
include/common/hpack-enc.h
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@ -238,4 +238,25 @@ static inline int hpack_encode_scheme(struct buffer *out, struct ist scheme)
return 1;
}
/* Tries to encode a :path pseudo-header with the path in <path>, into the
* aligned buffer <out>. Returns non-zero on success or 0 on failure (buffer
* full). The well-known values "/" and "/index.html" are recognized, and other
* ones are handled as literals. The caller is responsible for ensuring 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_path(struct buffer *out, struct ist path)
{
if (out->data < out->size && isteq(path, ist("/")))
out->area[out->data++] = 0x84; // indexed field : idx[04]=(":path", "/")
else if (out->data < out->size && isteq(path, ist("/index.html")))
out->area[out->data++] = 0x85; // indexed field : idx[05]=(":path", "/index.html")
else if (path.len < 127)
return hpack_encode_short_idx(out, 4, path); // name=":path" (idx 4)
else
return hpack_encode_long_idx(out, 4, path); // name=":path" (idx 4)
return 1;
}
#endif /* _COMMON_HPACK_ENC_H */