ref: 2bbc75bddc6f2a07056ff017108e35f14061041b
dir: /third_party/boringssl/src/crypto/bytestring/internal.h/
/* Copyright (c) 2014, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#ifndef OPENSSL_HEADER_BYTESTRING_INTERNAL_H
#define OPENSSL_HEADER_BYTESTRING_INTERNAL_H
#include <openssl/base.h>
#if defined(__cplusplus)
extern "C" {
#endif
// CBS_asn1_ber_to_der reads a BER element from |in|. If it finds
// indefinite-length elements or constructed strings then it converts the BER
// data to DER, sets |out| to the converted contents and |*out_storage| to a
// buffer which the caller must release with |OPENSSL_free|. Otherwise, it sets
// |out| to the original BER element in |in| and |*out_storage| to NULL.
// Additionally, |*in| will be advanced over the BER element.
//
// This function should successfully process any valid BER input, however it
// will not convert all of BER's deviations from DER. BER is ambiguous between
// implicitly-tagged SEQUENCEs of strings and implicitly-tagged constructed
// strings. Implicitly-tagged strings must be parsed with
// |CBS_get_ber_implicitly_tagged_string| instead of |CBS_get_asn1|. The caller
// must also account for BER variations in the contents of a primitive.
//
// It returns one on success and zero otherwise.
OPENSSL_EXPORT int CBS_asn1_ber_to_der(CBS *in, CBS *out,
uint8_t **out_storage);
// CBS_get_asn1_implicit_string parses a BER string of primitive type
// |inner_tag| implicitly-tagged with |outer_tag|. It sets |out| to the
// contents. If concatenation was needed, it sets |*out_storage| to a buffer
// which the caller must release with |OPENSSL_free|. Otherwise, it sets
// |*out_storage| to NULL.
//
// This function does not parse all of BER. It requires the string be
// definite-length. Constructed strings are allowed, but all children of the
// outermost element must be primitive. The caller should use
// |CBS_asn1_ber_to_der| before running this function.
//
// It returns one on success and zero otherwise.
OPENSSL_EXPORT int CBS_get_asn1_implicit_string(CBS *in, CBS *out,
uint8_t **out_storage,
unsigned outer_tag,
unsigned inner_tag);
// CBB_finish_i2d calls |CBB_finish| on |cbb| which must have been initialized
// with |CBB_init|. If |outp| is not NULL then the result is written to |*outp|
// and |*outp| is advanced just past the output. It returns the number of bytes
// in the result, whether written or not, or a negative value on error. On
// error, it calls |CBB_cleanup| on |cbb|.
//
// This function may be used to help implement legacy i2d ASN.1 functions.
int CBB_finish_i2d(CBB *cbb, uint8_t **outp);
// Unicode utilities.
// The following functions read one Unicode code point from |cbs| with the
// corresponding encoding and store it in |*out|. They return one on success and
// zero on error.
OPENSSL_EXPORT int cbs_get_utf8(CBS *cbs, uint32_t *out);
OPENSSL_EXPORT int cbs_get_latin1(CBS *cbs, uint32_t *out);
OPENSSL_EXPORT int cbs_get_ucs2_be(CBS *cbs, uint32_t *out);
OPENSSL_EXPORT int cbs_get_utf32_be(CBS *cbs, uint32_t *out);
// cbb_get_utf8_len returns the number of bytes needed to represent |u| in
// UTF-8.
OPENSSL_EXPORT size_t cbb_get_utf8_len(uint32_t u);
// The following functions encode |u| to |cbb| with the corresponding
// encoding. They return one on success and zero on error.
OPENSSL_EXPORT int cbb_add_utf8(CBB *cbb, uint32_t u);
OPENSSL_EXPORT int cbb_add_latin1(CBB *cbb, uint32_t u);
OPENSSL_EXPORT int cbb_add_ucs2_be(CBB *cbb, uint32_t u);
OPENSSL_EXPORT int cbb_add_utf32_be(CBB *cbb, uint32_t u);
#if defined(__cplusplus)
} // extern C
#endif
#endif // OPENSSL_HEADER_BYTESTRING_INTERNAL_H