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ccollins pushed a commit to branch master
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commit 9417697c3e1c259a02edd98cf60a1c5bc38760c6
Author: Christopher Collins <ccoll...@apache.org>
AuthorDate: Wed Jan 17 17:11:46 2018 -0800

    External base64 library.
---
 ext/base64/CMakeLists.txt                |  17 +++
 ext/base64/include/base64/base64.h       |  40 +++++++
 ext/base64/include/base64/hex.h          |  33 ++++++
 ext/base64/pkg.yml                       |  26 +++++
 ext/base64/src/base64.c                  | 181 +++++++++++++++++++++++++++++++
 ext/base64/src/hex.c                     | 101 +++++++++++++++++
 ext/base64/test/pkg.yml                  |  30 +++++
 ext/base64/test/src/encoding_test.c      |  53 +++++++++
 ext/base64/test/src/encoding_test_priv.h |  38 +++++++
 ext/base64/test/src/testcases/hex2str.c  |  64 +++++++++++
 ext/base64/test/src/testcases/str2hex.c  |  72 ++++++++++++
 11 files changed, 655 insertions(+)

diff --git a/ext/base64/CMakeLists.txt b/ext/base64/CMakeLists.txt
new file mode 100644
index 0000000..101985e
--- /dev/null
+++ b/ext/base64/CMakeLists.txt
@@ -0,0 +1,17 @@
+add_library(BASE64 INTERFACE)
+
+target_include_directories(BASE64 INTERFACE src)
+
+zephyr_library()
+target_include_directories(BASE64 INTERFACE
+    include
+    port/zephyr/include
+)
+
+zephyr_library_sources(
+    src/base64.c
+    src/hex.c
+)
+
+zephyr_library_link_libraries(BASE64)
+target_link_libraries(BASE64 INTERFACE zephyr_interface)
diff --git a/ext/base64/include/base64/base64.h 
b/ext/base64/include/base64/base64.h
new file mode 100644
index 0000000..53c4853
--- /dev/null
+++ b/ext/base64/include/base64/base64.h
@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+#ifndef __UTIL_BASE64_H
+#define __UTIL_BASE64_H
+
+#include <stdint.h>
+#include <string.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int base64_encode(const void *, int, char *, uint8_t);
+int base64_decode(const char *, void *buf);
+int base64_pad(char *, int);
+int base64_decode_len(const char *str);
+
+#define BASE64_ENCODE_SIZE(__size) (((((__size) - 1) / 3) * 4) + 4)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __UTIL_BASE64_H__ */
diff --git a/ext/base64/include/base64/hex.h b/ext/base64/include/base64/hex.h
new file mode 100644
index 0000000..8ebae77
--- /dev/null
+++ b/ext/base64/include/base64/hex.h
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+#ifndef _UTIL_HEX_H_
+#define _UTIL_HEX_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+char *hex_format(void *src_v, int src_len, char *dst, int dst_len);
+int hex_parse(const char *src, int src_len, void *dst_v, int dst_len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _UTIL_HEX_H_ */
diff --git a/ext/base64/pkg.yml b/ext/base64/pkg.yml
new file mode 100644
index 0000000..5ebb1b3
--- /dev/null
+++ b/ext/base64/pkg.yml
@@ -0,0 +1,26 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+#
+
+pkg.name: ext/base64
+pkg.description: Libary for base64 encoding and decoding.
+pkg.author: "Apache Mynewt <d...@mynewt.apache.org>"
+pkg.homepage: "http://mynewt.apache.org/";
+pkg.keywords:
+    - base64
+    - hex
diff --git a/ext/base64/src/base64.c b/ext/base64/src/base64.c
new file mode 100644
index 0000000..0587835
--- /dev/null
+++ b/ext/base64/src/base64.c
@@ -0,0 +1,181 @@
+/*
+ * This file is based on roken from the FreeBSD source.  It has been modified
+ * to not use malloc() and instead expect static buffers, and tabs have been
+ * replaced with spaces.  Also, instead of strlen() on the resulting string,
+ * pointer arithmitic is done, as p represents the end of the buffer.
+ */
+
+/*
+ * Copyright (c) 1995-2001 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. 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.
+ *
+ * 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <stdio.h>
+
+#include <base64/base64.h>
+
+static const char base64_chars[] =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static int
+pos(char c)
+{
+    const char *p;
+    for (p = base64_chars; *p; p++)
+        if (*p == c)
+            return p - base64_chars;
+    return -1;
+}
+
+int
+base64_encode(const void *data, int size, char *s, uint8_t should_pad)
+{
+    char *p;
+    int i;
+    int c;
+    const unsigned char *q;
+    char *last;
+    int diff;
+
+    p = s;
+
+    q = (const unsigned char *) data;
+    last = NULL;
+    i = 0;
+    while (i < size) {
+        c = q[i++];
+        c *= 256;
+        if (i < size)
+            c += q[i];
+        i++;
+        c *= 256;
+        if (i < size)
+            c += q[i];
+        i++;
+        p[0] = base64_chars[(c & 0x00fc0000) >> 18];
+        p[1] = base64_chars[(c & 0x0003f000) >> 12];
+        p[2] = base64_chars[(c & 0x00000fc0) >> 6];
+        p[3] = base64_chars[(c & 0x0000003f) >> 0];
+        last = p;
+        p += 4;
+    }
+
+    if (last) {
+        diff = i - size;
+        if (diff > 0) {
+            if (should_pad) {
+                memset(last + (4 - diff), '=', diff);
+            } else {
+                p = last + (4 - diff);
+            }
+        }
+    }
+
+    *p = 0;
+
+    return (p - s);
+}
+
+int
+base64_pad(char *buf, int len)
+{
+    int remainder;
+
+    remainder = len % 4;
+    if (remainder == 0) {
+        return (0);
+    }
+
+    memset(buf, '=', 4 - remainder);
+
+    return (4 - remainder);
+}
+
+#define DECODE_ERROR -1
+
+static unsigned int
+token_decode(const char *token)
+{
+    int i;
+    unsigned int val = 0;
+    int marker = 0;
+    if (strlen(token) < 4)
+        return DECODE_ERROR;
+    for (i = 0; i < 4; i++) {
+        val *= 64;
+        if (token[i] == '=')
+            marker++;
+        else if (marker > 0)
+            return DECODE_ERROR;
+        else
+            val += pos(token[i]);
+    }
+    if (marker > 2)
+        return DECODE_ERROR;
+    return (marker << 24) | val;
+}
+
+int
+base64_decode(const char *str, void *data)
+{
+    const char *p;
+    unsigned char *q;
+
+    q = data;
+    for (p = str; *p && (*p == '=' || strchr(base64_chars, *p)); p += 4) {
+        unsigned int val = token_decode(p);
+        unsigned int marker = (val >> 24) & 0xff;
+        if (val == DECODE_ERROR)
+            return -1;
+        *q++ = (val >> 16) & 0xff;
+        if (marker < 2)
+            *q++ = (val >> 8) & 0xff;
+        if (marker < 1)
+            *q++ = val & 0xff;
+    }
+    return q - (unsigned char *) data;
+}
+
+
+int
+base64_decode_len(const char *str)
+{
+    int len;
+
+    len = strlen(str);
+    while (len && str[len - 1] == '=') {
+        len--;
+    }
+    return len * 3 / 4;
+}
diff --git a/ext/base64/src/hex.c b/ext/base64/src/hex.c
new file mode 100644
index 0000000..0ff3209
--- /dev/null
+++ b/ext/base64/src/hex.c
@@ -0,0 +1,101 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+#include <inttypes.h>
+#include <ctype.h>
+#include <stddef.h>
+
+#include "base64/hex.h"
+
+static const char hex_bytes[] = "0123456789abcdef";
+
+/*
+ * Turn byte array into a printable array. I.e. "\x01" -> "01"
+ *
+ * @param src_v                Data to convert
+ * @param src_len      Number of bytes of input
+ * @param dst          String where to place the results
+ * @param dst_len      Size of the target string
+ *
+ * @return             Pointer to 'dst' if successful; NULL on failure
+ */
+char *
+hex_format(void *src_v, int src_len, char *dst, int dst_len)
+{
+    int i;
+    uint8_t *src = (uint8_t *)src_v;
+    char *tgt = dst;
+
+    if (dst_len <= src_len * 2) {
+        return NULL;
+    }
+    for (i = 0; i < src_len; i++) {
+        tgt[0] = hex_bytes[(src[i] >> 4) & 0xf];
+        tgt[1] = hex_bytes[src[i] & 0xf];
+        tgt += 2;
+        dst_len -= 2;
+    }
+    *tgt = '\0';
+    return dst;
+}
+
+/*
+ * Turn string of hex decimals into a byte array. I.e. "01" -> "\x01
+ *
+ * @param src          String to convert
+ * @param src_len      Number of bytes in input string
+ * @param dst_v                Memory location to place the result
+ * @param dst_len      Amount of space for the result
+ *
+ * @return             -1 on failure; number of bytes of input
+ */
+int
+hex_parse(const char *src, int src_len, void *dst_v, int dst_len)
+{
+    int i;
+    uint8_t *dst = (uint8_t *)dst_v;
+    char c;
+
+    if (src_len & 0x1) {
+        return -1;
+    }
+    if (dst_len * 2 < src_len) {
+        return -1;
+    }
+    for (i = 0; i < src_len; i++, src++) {
+        c = *src;
+        if (isdigit((int) c)) {
+            c -= '0';
+        } else if (c >= 'a' && c <= 'f') {
+            c -= ('a' - 10);
+        } else if (c >= 'A' && c <= 'F') {
+            c -= ('A' - 10);
+        } else {
+            return -1;
+        }
+        if (i & 1) {
+            *dst |= c;
+            dst++;
+            dst_len--;
+        } else {
+            *dst = c << 4;
+        }
+    }
+    return src_len >> 1;
+}
diff --git a/ext/base64/test/pkg.yml b/ext/base64/test/pkg.yml
new file mode 100644
index 0000000..2c85ee7
--- /dev/null
+++ b/ext/base64/test/pkg.yml
@@ -0,0 +1,30 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+#
+pkg.name: ext/base64/test
+pkg.type: unittest
+pkg.description: "base64 encoding unit tests."
+pkg.author: "Apache Mynewt <d...@mynewt.apache.org>"
+pkg.homepage: "http://mynewt.apache.org/";
+pkg.keywords:
+
+pkg.deps: 
+    - "@apache-mynewt-core/test/testutil"
+    - "@apache-mynewt-core/encoding/base64"
+
+pkg.deps.SELFTEST:
+    - "@apache-mynewt-core/sys/console/stub"
diff --git a/ext/base64/test/src/encoding_test.c 
b/ext/base64/test/src/encoding_test.c
new file mode 100644
index 0000000..e8af540
--- /dev/null
+++ b/ext/base64/test/src/encoding_test.c
@@ -0,0 +1,53 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+#include <assert.h>
+#include <stddef.h>
+#include "sysinit/sysinit.h"
+#include "syscfg/syscfg.h"
+#include "testutil/testutil.h"
+#include "encoding_test_priv.h"
+
+TEST_CASE_DECL(hex2str)
+TEST_CASE_DECL(str2hex)
+
+int
+hex_fmt_test_all(void)
+{
+    hex_fmt_test_suite();
+    return tu_case_failed;
+}
+
+TEST_SUITE(hex_fmt_test_suite)
+{
+    hex2str();
+    str2hex();
+}
+
+#if MYNEWT_VAL(SELFTEST)
+
+int
+main(int argc, char **argv)
+{
+    sysinit();
+
+    hex_fmt_test_all();
+    return tu_any_failed;
+}
+
+#endif
diff --git a/ext/base64/test/src/encoding_test_priv.h 
b/ext/base64/test/src/encoding_test_priv.h
new file mode 100644
index 0000000..2630e5c
--- /dev/null
+++ b/ext/base64/test/src/encoding_test_priv.h
@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+#ifndef __ENCODING_TEST_PRIV_
+#define __ENCODING_TEST_PRIV_
+
+#include <assert.h>
+#include <stddef.h>
+#include "syscfg/syscfg.h"
+#include "base64/hex.h"
+#include "testutil/testutil.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int hex_fmt_test_suite(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/ext/base64/test/src/testcases/hex2str.c 
b/ext/base64/test/src/testcases/hex2str.c
new file mode 100644
index 0000000..b1f1adc
--- /dev/null
+++ b/ext/base64/test/src/testcases/hex2str.c
@@ -0,0 +1,64 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+#include <string.h>
+#include "encoding_test_priv.h"
+
+TEST_CASE(hex2str)
+{
+    int i;
+    char *ret;
+    char cmp_data[8];
+
+    struct {
+        char *in;
+        int inlen;
+        char *out;
+        int outlen;
+    } test_data[] = {
+        [0] = {
+            .in = "\x01",
+            .inlen = 1,
+            .out = "01",
+            .outlen = 2,
+        },
+        [1] = {
+            .in = "\xaf\xf2",
+            .inlen = 2,
+            .out = "aff2",
+            .outlen = 4,
+        }
+    };
+
+    for (i = 0; i < sizeof(test_data) / sizeof(test_data[0]); i++) {
+        ret = hex_format(test_data[i].in, test_data[i].inlen,
+          cmp_data, sizeof(cmp_data));
+        TEST_ASSERT(ret == cmp_data);
+        TEST_ASSERT(strlen(cmp_data) == test_data[i].outlen);
+        TEST_ASSERT(!strcmp(test_data[i].out, cmp_data));
+    }
+
+    /*
+     * Test not enough space. Must have space for '\0' at the end.
+     */
+    ret = hex_format("\x01\x02", 2, cmp_data, 1);
+    TEST_ASSERT(ret == NULL);
+
+    ret = hex_format("\x01\x02", 2, cmp_data, 2);
+    TEST_ASSERT(ret == NULL);
+}
diff --git a/ext/base64/test/src/testcases/str2hex.c 
b/ext/base64/test/src/testcases/str2hex.c
new file mode 100644
index 0000000..c17066c
--- /dev/null
+++ b/ext/base64/test/src/testcases/str2hex.c
@@ -0,0 +1,72 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+#include <string.h>
+#include "encoding_test_priv.h"
+
+TEST_CASE(str2hex)
+{
+    int i;
+    char cmp_data[8];
+    int rc;
+
+    struct {
+        char *in;
+        int inlen;
+        char *out;
+        int outlen;
+    } test_data[] = {
+        [0] = {
+            .in = "01",
+            .inlen = 2,
+            .out = "\x01",
+            .outlen = 1,
+        },
+        [1] = {
+            .in = "AfF2",
+            .inlen = 4,
+            .out = "\xaf\xf2",
+            .outlen = 2,
+        }
+    };
+
+    for (i = 0; i < sizeof(test_data) / sizeof(test_data[0]); i++) {
+        rc = hex_parse(test_data[i].in, test_data[i].inlen,
+          cmp_data, sizeof(cmp_data));
+        TEST_ASSERT(rc == test_data[i].outlen);
+        TEST_ASSERT(!memcmp(test_data[i].out, cmp_data, rc));
+    }
+
+    /*
+     * Test invalid input
+     */
+    rc = hex_parse("HJ", 2, cmp_data, sizeof(cmp_data));
+    TEST_ASSERT(rc < 0);
+
+    rc = hex_parse("a", 1, cmp_data, sizeof(cmp_data));
+    TEST_ASSERT(rc < 0);
+
+    rc = hex_parse("0102", 4, cmp_data, 1);
+    TEST_ASSERT(rc < 0);
+
+    /*
+     * This should be valid.
+     */
+    rc = hex_parse("0102", 4, cmp_data, 2);
+    TEST_ASSERT(rc == 2);
+}

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