https://github.com/telkomdev/cb64
A Header Only Base64 Encoder and Decoder implementation in C
https://github.com/telkomdev/cb64
Last synced: 4 months ago
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A Header Only Base64 Encoder and Decoder implementation in C
- Host: GitHub
- URL: https://github.com/telkomdev/cb64
- Owner: telkomdev
- License: mit
- Created: 2021-10-31T15:34:33.000Z (over 3 years ago)
- Default Branch: master
- Last Pushed: 2022-11-14T13:42:33.000Z (over 2 years ago)
- Last Synced: 2025-01-16T20:19:11.205Z (5 months ago)
- Language: C
- Homepage:
- Size: 72.3 KB
- Stars: 1
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
## cb64
Base64 Encoding implementation in C Programming Language
[](https://github.com/telkomdev/cb64/actions/workflows/ci.yml)
Spec: https://datatracker.ietf.org/doc/html/rfc4648#page-5
### Header only
So just copy [`cb64.h`](https://github.com/telkomdev/cb64/blob/master/b64/cb64.h) to your project, and you ready to go
### Building Example
```shell
$ mkdir build
$ cd build/
$ cmake ..
$ make
$ cd ..
```
Run example binary
```shell
$ ./bin/cb64 ./testdata/octocat.png
```
### Usage
#### Encoding
Encode and Decode Text
```c
#include
#include
#include "cb64.h"
#define EXIT_ERR(msg) { \
printf("%s\n", msg); \
exit(-1); \
}
int get_file_size(size_t* size, FILE* f);
int main(int argc, char** argv) {
unsigned char* input = "wur0";
unsigned char* dst = NULL;
size_t dst_size = 0;
int encode_ok = encode_b64(input, 0, &dst, &dst_size);
if (encode_ok != 0)
EXIT_ERR("error encode text to base64");
printf("%s\n", dst);
printf("%lu\n", dst_size);
unsigned char* dst_decode = NULL;
size_t dst_size_decode = 0;
int decode_ok = decode_b64(dst, 0, &dst_decode, &dst_size_decode);
if (decode_ok != 0)
EXIT_ERR("error decode text to base64");
printf("%s\n", dst_decode);
printf("%lu\n", dst_size_decode);
free(dst);
free(dst_decode);
return 0;
}
```
Encode File
```c
#include
#include
#include "cb64.h"
#define EXIT_ERR(msg) { \
printf("%s\n", msg); \
exit(-1); \
}
int get_file_size(size_t* size, FILE* f);
int main(int argc, char** argv)
{
// encode file to base64
if (argc < 2)
{
EXIT_ERR("required filename");
}
char* filename = argv[1];
char* filename_out = "../testdata/out.txt";
printf("filename : %s\n", filename);
FILE* file;
FILE* file_out;
file = fopen(filename, "rb");
if (file == NULL)
{
EXIT_ERR("file not found");
}
file_out = fopen(filename_out, "wb");
size_t file_size;
if (get_file_size(&file_size, file) != 0)
EXIT_ERR("error get file size");
printf("%lu\n", file_size);
unsigned char input[file_size+1];
unsigned char* dst = NULL;
size_t dst_size = 0;
fread(input, sizeof(char), file_size, file);
input[file_size] = '\0';
int encode_ok = encode_b64(input, file_size, &dst, &dst_size);
if (encode_ok != 0)
EXIT_ERR("error encode text to base64");
// printf("%s\n", dst);
fwrite(dst, 1, dst_size, file_out);
fclose(file);
fclose(file_out);
free(dst);
return 0;
}
int get_file_size(size_t* size, FILE* f)
{
// goto the end of the file
if (fseek(f, 0L, SEEK_END) != 0)
return -1;
// get the current file position of the given stream.
*size = ftell(f);
// go back the start of the file
if (fseek(f, 0L, SEEK_SET) != 0)
return -1;
return 0;
}
```
Decode File from Base64 Text
```c
#include
#include
#include "cb64.h"
#define EXIT_ERR(msg) { \
printf("%s\n", msg); \
exit(-1); \
}
int get_file_size(size_t* size, FILE* f);
int main(int argc, char** argv)
{
char* filename = "../testdata/haha.txt";
char* filename_out = "../testdata/out.png";
FILE* file;
FILE* file_out;
file = fopen(filename, "r");
if (file == NULL)
{
EXIT_ERR("file not found");
}
file_out = fopen(filename_out, "wb");
size_t file_size;
if (get_file_size(&file_size, file) != 0)
EXIT_ERR("error get file size");
printf("%lu\n", file_size);
unsigned char input[file_size+1];
unsigned char* dst_decode = NULL;
size_t dst_size_decode = 0;
fread(input, sizeof(char), file_size, file);
input[file_size] = '\0';
int decode_ok = decode_b64(input, 0, &dst_decode, &dst_size_decode);
if (decode_ok != 0)
EXIT_ERR("error decode text to base64");
printf("%s\n", dst_decode);
fwrite(dst_decode, 1, dst_size_decode, file_out);
free(dst_decode);
fclose(file);
fclose(file_out);
return 0;
}
int get_file_size(size_t* size, FILE* f)
{
// goto the end of the file
if (fseek(f, 0L, SEEK_END) != 0)
return -1;
// get the current file position of the given stream.
*size = ftell(f);
// go back the start of the file
if (fseek(f, 0L, SEEK_SET) != 0)
return -1;
return 0;
}
```