Commit c57b2b71 authored by Richard van der Hoff's avatar Richard van der Hoff
Browse files

C bindings for base64 functions

parent a1855b99
/* Copyright 2015, 2016 OpenMarket Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* C bindings for base64 functions */
#ifndef OLM_BASE64_H_
#define OLM_BASE64_H_
#include <stddef.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* The number of bytes of unpadded base64 needed to encode a length of input.
*/
size_t olm_encode_base64_length(
size_t input_length
);
/**
* Encode the raw input as unpadded base64.
* Writes encode_base64_length(input_length) bytes to the output buffer.
* The input can overlap with the last three quarters of the output buffer.
* That is, the input pointer may be output + output_length - input_length.
*
* Returns number of bytes encoded
*/
size_t olm_encode_base64(
uint8_t const * input, size_t input_length,
uint8_t * output
);
/**
* The number of bytes of raw data a length of unpadded base64 will encode to.
* Returns size_t(-1) if the length is not a valid length for base64.
*/
size_t olm_decode_base64_length(
size_t input_length
);
/**
* Decodes the unpadded base64 input to raw bytes.
* Writes decode_base64_length(input_length) bytes to the output buffer.
* The output can overlap with the first three quarters of the input buffer.
* That is, the input pointers and output pointer may be the same.
*
* Returns number of bytes decoded
*/
size_t olm_decode_base64(
uint8_t const * input, size_t input_length,
uint8_t * output
);
#ifdef __cplusplus
} // extern "C"
#endif
#endif /* OLM_BASE64_H_ */
......@@ -12,9 +12,9 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "olm/base64.h"
#include "olm/base64.hh"
namespace {
static const std::uint8_t ENCODE_BASE64[64] = {
......@@ -134,3 +134,34 @@ std::uint8_t const * olm::decode_base64(
}
return input + input_length;
}
// implementations of base64.h
size_t olm_encode_base64_length(
size_t input_length
) {
return olm::encode_base64_length(input_length);
}
size_t olm_encode_base64(
uint8_t const * input, size_t input_length,
uint8_t * output
) {
uint8_t * r = olm::encode_base64(input, input_length, output);
return r - output;
}
size_t olm_decode_base64_length(
size_t input_length
) {
return olm::decode_base64_length(input_length);
}
size_t olm_decode_base64(
uint8_t const * input, size_t input_length,
uint8_t * output
) {
olm::decode_base64(input, input_length, output);
return olm::decode_base64_length(input_length);
}
#include "olm/base64.hh"
#include "olm/base64.h"
#include "unittest.hh"
int main() {
{ /* Base64 encode test */
TestCase test_case("Base64 encode test");
TestCase test_case("Base64 C++ binding encode test");
std::uint8_t input[] = "Hello World";
std::uint8_t expected_output[] = "SGVsbG8gV29ybGQ";
......@@ -18,8 +19,24 @@ olm::encode_base64(input, input_length, output);
assert_equals(expected_output, output, output_length);
}
{
TestCase test_case("Base64 C binding encode test");
std::uint8_t input[] = "Hello World";
std::uint8_t expected_output[] = "SGVsbG8gV29ybGQ";
std::size_t input_length = sizeof(input) - 1;
std::size_t output_length = ::olm_encode_base64_length(input_length);
assert_equals(std::size_t(15), output_length);
std::uint8_t output[output_length];
output_length = ::olm_encode_base64(input, input_length, output);
assert_equals(std::size_t(15), output_length);
assert_equals(expected_output, output, output_length);
}
{ /* Base64 decode test */
TestCase test_case("Base64 decode test");
TestCase test_case("Base64 C++ binding decode test");
std::uint8_t input[] = "SGVsbG8gV29ybGQ";
std::uint8_t expected_output[] = "Hello World";
......@@ -33,4 +50,21 @@ olm::decode_base64(input, input_length, output);
assert_equals(expected_output, output, output_length);
}
{
TestCase test_case("Base64 C binding decode test");
std::uint8_t input[] = "SGVsbG8gV29ybGQ";
std::uint8_t expected_output[] = "Hello World";
std::size_t input_length = sizeof(input) - 1;
std::size_t output_length = ::olm_decode_base64_length(input_length);
assert_equals(std::size_t(11), output_length);
std::uint8_t output[output_length];
output_length = ::olm_decode_base64(input, input_length, output);
assert_equals(std::size_t(11), output_length);
assert_equals(expected_output, output, output_length);
}
}
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