Implement Base64 encoding function

This commit is contained in:
Mario Hüttel 2020-11-01 17:58:05 +01:00
commit 2035cf0ad8
10 changed files with 18289 additions and 0 deletions

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CMakeLists.txt Normal file
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cmake_minimum_required(VERSION 2.8)
project(base64-lib)
aux_source_directory("src" SOURCES)
add_library(${PROJECT_NAME} STATIC ${SOURCES})
target_include_directories(${PROJECT_NAME} PUBLIC include)
add_subdirectory(test)

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### GNU GENERAL PUBLIC LICENSE
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This is a small implementation of base64 encode and decode functions designed for embedded systems.
No dynamic memory is needed. However, a fair amount of static memory is needed for the lookup tables.
Storage of the lookup tables can be adapted using the ``BASE64_LOOKUP_TABLE_SECTION`` define.
If it is set, the lookup table will be moved to the section specified by the define. Example:
``#define BASE64_LOOKUP_TABLE_SECTION ".bss"``
This project is licensed under GPLv2.

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#include <stddef.h>
int base64_encode(const char *src, char *dest, size_t src_size, size_t dest_size, size_t *output_length);
size_t base64_calculate_encoded_size(size_t unencoded_size);
size_t base64_calculate_maximum_decoded_size(size_t encoded_size);

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#include <base64-lib/base64-lib.h>
#include <stdint.h>
#include <stdbool.h>
#ifdef BASE64_LOOKUP_TABLE_SECTION
#define LOOKUP_SECTION_ATTR __attribute__((section(BASE64_LOOKUP_TABLE_SECTION)))
#else
#define LOOKUP_SECTION_ATTR
#endif
static bool base64_lib_initialized = false;
static char LOOKUP_SECTION_ATTR base64_encode_table[64];
static void initialize_encode_lookup_table(void)
{
int idx = 0;
char encoded_char;
for (encoded_char = 'A'; encoded_char <= 'Z'; encoded_char++, idx++)
base64_encode_table[idx] = encoded_char;
for (encoded_char = 'a'; encoded_char <= 'z'; encoded_char++, idx++)
base64_encode_table[idx] = encoded_char;
for (encoded_char = '0'; encoded_char <= '9'; encoded_char++, idx++)
base64_encode_table[idx] = encoded_char;
base64_encode_table[62] = '+';
base64_encode_table[63] = '/';
}
static void base64_init(void)
{
if (base64_lib_initialized)
return;
initialize_encode_lookup_table();
base64_lib_initialized = true;
}
int base64_encode(const char *src, char *dest, size_t src_size, size_t dest_size, size_t *output_length)
{
unsigned int src_idx;
unsigned int dest_idx;
uint32_t first_byte, second_byte, third_byte;
uint32_t three_bytes;
uint8_t input_vals_padded;
static const uint8_t padding_count_table[] = {0, 2, 1};
if (!src || !dest || !output_length)
return -1000;
/* Base 64 converts 3 bytes to 4 output chars.
* The following formula ensures, that the value of in_size / 3 * 4 is rounded up.
*/
*output_length = base64_calculate_encoded_size(src_size);
/* Check if the converted data fits into tzhe buffer */
if (*output_length > dest_size)
return -1;
/* Init base64 module if not already initialized */
base64_init();
/* Loop over data */
for (src_idx = 0, dest_idx = 0; src_idx < src_size;) {
/* Extract 3 bytes from the input data. Pad with zeroes if end is reached.
* uint32_t variables are used, because they make concatenating the bytes to one
* 32 bit number easier.
*/
first_byte = (uint32_t)src[src_idx++];
second_byte = (src_idx < src_size ? (uint32_t)src[src_idx++] : 0UL);
third_byte = (src_idx < src_size ? (uint32_t)src[src_idx++] : 0UL);
/* Concatenate the three input values */
three_bytes = (first_byte << 16U) | (second_byte << 8U) | third_byte;
/* Extract 6 bit blocks and convert them to the ouput data */
dest[dest_idx++] = base64_encode_table[(three_bytes >> 3 * 6) & 0x3F];
dest[dest_idx++] = base64_encode_table[(three_bytes >> 2 * 6) & 0x3F];
dest[dest_idx++] = base64_encode_table[(three_bytes >> 1 * 6) & 0x3F];
dest[dest_idx++] = base64_encode_table[(three_bytes) & 0x3F];
}
/* If the last values have been padded, the last one or two symbols in the ouput stream are incorrect
* and have to be replaced with '='
*/
input_vals_padded = padding_count_table[src_size % 3];
for (dest_idx-- ;input_vals_padded > 0; input_vals_padded--) {
dest[dest_idx--] = '=';
}
return 0;
}
size_t base64_calculate_encoded_size(size_t unencoded_size)
{
return (size_t)(4 * ((unencoded_size + 2) / 3));
}
size_t base64_calculate_maximum_decoded_size(size_t encoded_size)
{
if (encoded_size % 4)
return 0;
return encoded_size / 4 * 3;
}

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project(base64-test)
add_custom_target(test "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}" "-r compact" "-s" DEPENDS ${PROJECT_NAME})
include_directories("${CMAKE_CURRENT_SOURCE_DIR}/catch-framework")
aux_source_directory("src" TEST_SOURCES)
add_executable(${PROJECT_NAME} ${TEST_SOURCES})
target_link_libraries(${PROJECT_NAME} base64-lib)

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#define CATCH_CONFIG_MAIN
#include <catch.hpp>

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#include <catch.hpp>
#include <string>
#include <iostream>
extern "C" {
#include <base64-lib/base64-lib.h>
}
std::string lorem_ipsum = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque tristique eu nibh eget efficitur."
" Proin pretium, massa in varius malesuada, purus ante pellentesque libero, ut dictum justo enim vel elit."
" Nullam convallis lectus non placerat lobortis. Aliquam consequat mi nulla, eget ultricies nibh ullamcorper at."
" Ut vitae commodo tellus, ut tempor lectus. Etiam vel cursus purus. Etiam ac sagittis nisl, ac mollis mauris."
" Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos."
" Fusce imperdiet malesuada tellus sit amet hendrerit."
" Suspendisse et lacus vehicula, viverra mauris id, scelerisque diam."
" Donec hendrerit mattis neque, non iaculis nisi accumsan quis.";
std::string base64_reference = "TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQsIGNvbnNlY3RldHVyIGFkaXBpc2NpbmcgZWxpdC4g"
"UXVpc3F1ZSB0cmlzdGlxdWUgZXUgbmliaCBlZ2V0IGVmZmljaXR1ci4gUHJvaW4gcHJldGl1bSwg"
"bWFzc2EgaW4gdmFyaXVzIG1hbGVzdWFkYSwgcHVydXMgYW50ZSBwZWxsZW50ZXNxdWUgbGliZXJv"
"LCB1dCBkaWN0dW0ganVzdG8gZW5pbSB2ZWwgZWxpdC4gTnVsbGFtIGNvbnZhbGxpcyBsZWN0dXMg"
"bm9uIHBsYWNlcmF0IGxvYm9ydGlzLiBBbGlxdWFtIGNvbnNlcXVhdCBtaSBudWxsYSwgZWdldCB1"
"bHRyaWNpZXMgbmliaCB1bGxhbWNvcnBlciBhdC4gVXQgdml0YWUgY29tbW9kbyB0ZWxsdXMsIHV0"
"IHRlbXBvciBsZWN0dXMuIEV0aWFtIHZlbCBjdXJzdXMgcHVydXMuIEV0aWFtIGFjIHNhZ2l0dGlz"
"IG5pc2wsIGFjIG1vbGxpcyBtYXVyaXMuIENsYXNzIGFwdGVudCB0YWNpdGkgc29jaW9zcXUgYWQg"
"bGl0b3JhIHRvcnF1ZW50IHBlciBjb251YmlhIG5vc3RyYSwgcGVyIGluY2VwdG9zIGhpbWVuYWVv"
"cy4gRnVzY2UgaW1wZXJkaWV0IG1hbGVzdWFkYSB0ZWxsdXMgc2l0IGFtZXQgaGVuZHJlcml0LiBT"
"dXNwZW5kaXNzZSBldCBsYWN1cyB2ZWhpY3VsYSwgdml2ZXJyYSBtYXVyaXMgaWQsIHNjZWxlcmlz"
"cXVlIGRpYW0uIERvbmVjIGhlbmRyZXJpdCBtYXR0aXMgbmVxdWUsIG5vbiBpYWN1bGlzIG5pc2kg"
"YWNjdW1zYW4gcXVpcy4=";
TEST_CASE("base64/encode", "[ENCODE]")
{
int res;
char base64_encoded[2048];
size_t output_len;
res = base64_encode(lorem_ipsum.c_str(), base64_encoded, lorem_ipsum.length(), sizeof(base64_encoded), &output_len);
REQUIRE(res == 0);
if (!res) {
base64_encoded[output_len] = 0;
REQUIRE(output_len == base64_reference.length());
REQUIRE(base64_reference == std::string(base64_encoded));
}
}
TEST_CASE("base64/encoded_size_calc", "[ENCODE]")
{
size_t res;
res = base64_calculate_encoded_size(1U);
REQUIRE(res == 4);
res = base64_calculate_encoded_size(2U);
REQUIRE(res == 4);
res = base64_calculate_encoded_size(3U);
REQUIRE(res == 4);
res = base64_calculate_encoded_size(4U);
REQUIRE(res == 8);
res = base64_calculate_encoded_size(120U);
REQUIRE(res == 160);
res = base64_calculate_encoded_size(119U);
REQUIRE(res == 160);
}
TEST_CASE("base64/base64_calculate_maximum_decoded_size", "[DECODE]")
{
REQUIRE(base64_calculate_maximum_decoded_size(3) == 0);
REQUIRE(base64_calculate_maximum_decoded_size(4) == 3);
REQUIRE(base64_calculate_maximum_decoded_size(160) == 120);
}