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base64: Add decoder
This commit is contained in:
Matthew Joyce
committed by
Sebastian Huber
Sebastian Huber
parent
c90e2b2fb2
commit
2757b36098
@@ -0,0 +1,180 @@
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/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* Copyright (C) 2023 embedded brains GmbH & Co. KG
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <rtems/base64.h>
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#include <rtems/test.h>
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typedef struct {
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Base64_Decode_control base;
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uint8_t buf[64];
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} test_control;
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static int test_run(test_control* self, const char* payload) {
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size_t len = strlen(payload);
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for (size_t i = 0; i < len; ++i) {
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int rv = _Base64_Decode(&self->base, payload[i]);
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if (rv != 0) {
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return rv;
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}
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}
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return 0;
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}
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static int test_payload(test_control* self, const char* payload) {
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memset(self->buf, 0xff, sizeof(self->buf));
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_Base64_Decode_initialize(&self->base, &self->buf[0], sizeof(self->buf));
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return test_run(self, payload);
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}
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T_TEST_CASE(IOBase64Decode) {
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int rv;
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test_control instance;
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test_control* self = &instance;
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rv = test_payload(self, "POOL");
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T_eq_int(rv, BASE64_DECODE_SUCCESS);
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T_eq_int(self->base.state, BASE64_DECODE_STATE_0);
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T_eq_ptr(self->base.target, &self->buf[3]);
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const uint8_t expected1[] = {0x3c, 0xe3, 0x8b, 0xff};
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T_eq_mem(&self->buf[0], expected1, sizeof(expected1));
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rv = test_payload(self, "ABCDEFGH");
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T_eq_int(rv, BASE64_DECODE_SUCCESS);
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T_eq_int(self->base.state, BASE64_DECODE_STATE_0);
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T_eq_ptr(self->base.target, &self->buf[6]);
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const uint8_t expected2[] = {0x00, 0x10, 0x83, 0x10, 0x51, 0x87, 0xff};
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T_eq_mem(&self->buf[0], expected2, sizeof(expected2));
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/* Non-base64 character results in an error */
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rv = test_payload(self, "PO*OL");
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T_eq_int(rv, BASE64_DECODE_INVALID_INPUT);
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T_eq_int(self->base.state, BASE64_DECODE_STATE_2);
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T_eq_ptr(self->base.target, &self->buf[1]);
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const uint8_t expected3[] = {0x3c};
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T_eq_mem(&self->buf[0], expected3, sizeof(expected3));
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/* Other non-base64 character results in an error */
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rv = test_payload(self, "PO\x80OL");
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T_eq_int(rv, BASE64_DECODE_INVALID_INPUT);
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T_eq_int(self->base.state, BASE64_DECODE_STATE_2);
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T_eq_ptr(self->base.target, &self->buf[1]);
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T_eq_mem(&self->buf[0], expected3, sizeof(expected3));
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/* Space characters should be ignored */
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rv = test_payload(self, "P OOL");
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T_eq_int(rv, BASE64_DECODE_SUCCESS);
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T_eq_int(self->base.state, BASE64_DECODE_STATE_0);
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T_eq_ptr(self->base.target, &self->buf[3]);
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const uint8_t expected4[] = {0x3c, 0xe3, 0x8b, 0xff};
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T_eq_mem(&self->buf[0], expected4, sizeof(expected4));
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/* Handle pad characters */
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rv = test_payload(self, "POOL==");
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T_eq_int(rv, BASE64_DECODE_SUCCESS);
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T_eq_int(self->base.state, BASE64_DECODE_STATE_0);
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T_eq_ptr(self->base.target, &self->buf[3]);
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T_eq_ptr(self->base.target, self->base.target_end);
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const uint8_t expected5[] = {0x3c, 0xe3, 0x8b, 0xff};
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T_eq_mem(&self->buf[0], expected5, sizeof(expected5));
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/* If characters come after pad characters, an error results */
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rv = test_payload(self, "POOL==xy");
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T_eq_int(rv, BASE64_DECODE_OVERFLOW);
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T_eq_int(self->base.state, BASE64_DECODE_SUCCESS);
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T_eq_ptr(self->base.target, &self->buf[3]);
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T_eq_ptr(self->base.target, self->base.target_end);
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const uint8_t expected6[] = {0x3c, 0xe3, 0x8b, 0xff};
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T_eq_mem(&self->buf[0], expected6, sizeof(expected6));
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rv = test_payload(self, "POOLPOOL");
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T_eq_int(rv, BASE64_DECODE_SUCCESS);
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T_eq_int(self->base.state, BASE64_DECODE_STATE_0);
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T_eq_ptr(self->base.target, &self->buf[6]);
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const uint8_t expected7[] = {0x3c, 0xe3, 0x8b, 0x3c, 0xe3, 0x8b, 0xff};
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T_eq_mem(&self->buf[0], expected7, sizeof(expected7));
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/*
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* Test valid payload with series of target sizes. All target sizes
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* less than three are invalid for the given payload and will result
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* in an error.
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*/
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const uint8_t expected9[] = {0x3c, 0xe3, 0x8b, 0xff};
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for (size_t i = 0; i < 4; ++i) {
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memset(&self->buf[0], 0xff, sizeof(self->buf));
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_Base64_Decode_initialize(&self->base, &self->buf[0], i);
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rv = test_run(self, "POOL");
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if (i < 3) {
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T_eq_int(rv, BASE64_DECODE_OVERFLOW);
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T_eq_int(self->base.state, i);
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T_ne_ptr(self->base.target, &self->buf[3]);
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T_ne_mem(&self->buf[0], expected9, sizeof(expected9));
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} else {
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T_eq_int(rv, BASE64_DECODE_SUCCESS);
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T_eq_int(self->base.state, BASE64_DECODE_STATE_0);
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T_eq_ptr(self->base.target, &self->buf[3]);
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T_eq_mem(&self->buf[0], expected9, sizeof(expected9));
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}
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}
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/* No overflow in state 1 */
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memset(&self->buf[0], 0xff, sizeof(self->buf));
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_Base64_Decode_initialize(&self->base, &self->buf[0], 1);
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rv = test_run(self, "AA");
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T_eq_int(rv, BASE64_DECODE_SUCCESS);
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T_eq_int(self->base.state, BASE64_DECODE_STATE_2);
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T_eq_ptr(self->base.target, &self->buf[1]);
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const uint8_t expected10[] = {0x00, 0xff};
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T_eq_mem(&self->buf[0], expected10, sizeof(expected10));
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/* No overflow in state 2 */
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memset(&self->buf[0], 0xff, sizeof(self->buf));
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_Base64_Decode_initialize(&self->base, &self->buf[0], 2);
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rv = test_run(self, "AAA");
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T_eq_int(rv, BASE64_DECODE_SUCCESS);
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T_eq_int(self->base.state, BASE64_DECODE_STATE_3);
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T_eq_ptr(self->base.target, &self->buf[2]);
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const uint8_t expected11[] = {0x00, 0x00, 0xff};
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T_eq_mem(&self->buf[0], expected11, sizeof(expected11));
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}
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T_TEST_CASE(IOBase64DecodeInitialize) {
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Base64_Decode_control instance;
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Base64_Decode_control* self = &instance;
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uint8_t buf[1];
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memset(self, 0xff, sizeof(*self));
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_Base64_Decode_initialize(self, buf, sizeof(buf));
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T_eq_int(self->state, BASE64_DECODE_STATE_0);
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T_eq_ptr(self->target, &buf[0]);
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T_eq_ptr(self->target_end, &buf[1]);
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}
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