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/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef GRPC_CORE_LIB_SUPPORT_PERCENT_ENCODING_H
#define GRPC_CORE_LIB_SUPPORT_PERCENT_ENCODING_H
/* Percent encoding and decoding of slices.
Transforms arbitrary strings into safe-for-transmission strings by using
variants of percent encoding (RFC 3986).
Two major variants are supplied: one that strictly matches URL encoding,
and another which applies percent encoding only to non-http2 header
bytes (the 'compatible' variant) */
#include <stdbool.h>
#include <grpc/support/slice.h>
/* URL percent encoding spec bitfield (usabel as 'unreserved_bytes' in
gpr_percent_encode_slice, gpr_strict_percent_decode_slice).
Flags [A-Za-z0-9-_.~] as unreserved bytes for the percent encoding routines
*/
extern const uint8_t gpr_url_percent_encoding_unreserved_bytes[256 / 8];
/* URL percent encoding spec bitfield (usabel as 'unreserved_bytes' in
gpr_percent_encode_slice, gpr_strict_percent_decode_slice).
Flags ascii7 non-control characters excluding '%' as unreserved bytes for the
percent encoding routines */
extern const uint8_t gpr_compatible_percent_encoding_unreserved_bytes[256 / 8];
/* Percent-encode a slice, returning the new slice (this cannot fail):
unreserved_bytes is a bitfield indicating which bytes are considered
unreserved and thus do not need percent encoding */
gpr_slice gpr_percent_encode_slice(gpr_slice slice,
const uint8_t *unreserved_bytes);
/* Percent-decode a slice, strictly.
If the input is legal (contains no unreserved bytes, and legal % encodings),
returns true and sets *slice_out to the decoded slice.
If the input is not legal, returns false and leaves *slice_out untouched.
unreserved_bytes is a bitfield indicating which bytes are considered
unreserved and thus do not need percent encoding */
bool gpr_strict_percent_decode_slice(gpr_slice slice_in,
const uint8_t *unreserved_bytes,
gpr_slice *slice_out);
/* Percent-decode a slice, permissively.
If a % triplet can not be decoded, pass it through verbatim.
This cannot fail. */
gpr_slice gpr_permissive_percent_decode_slice(gpr_slice slice_in);
#endif /* GRPC_CORE_LIB_SUPPORT_PERCENT_ENCODING_H */
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