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https://github.com/fhunleth/code128
Trivial Code 128 barcode encoder
https://github.com/fhunleth/code128
Last synced: 3 months ago
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Trivial Code 128 barcode encoder
- Host: GitHub
- URL: https://github.com/fhunleth/code128
- Owner: fhunleth
- License: bsd-2-clause
- Created: 2013-01-20T16:25:34.000Z (almost 12 years ago)
- Default Branch: main
- Last Pushed: 2023-03-30T13:31:45.000Z (almost 2 years ago)
- Last Synced: 2024-10-13T09:56:25.134Z (3 months ago)
- Language: C
- Size: 136 KB
- Stars: 58
- Watchers: 7
- Forks: 18
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# GS1-128/Code 128 barcode encoder
This is a simple [GS1-128](http://en.wikipedia.org/wiki/GS1-128) barcode
encoder library. The reason to choose it over others is simply that it is
written in pure C code and has no external dependencies. That's right - it
doesn't even depend on a graphics library. As a bonus, the barcodes produced
by this program will automatically use the Code 128 A, B, or C modes based
on what generates the shortest barcode.
Here's how to use:
```C
const char *str = "[FNC1] 00 12345678 0000000001";
size_t barcode_length = code128_estimate_len(str);
char *barcode_data = (char *) malloc(barcode_length);
int i;
barcode_length = code128_encode_gs1(str, barcode_data, barcode_length);
/* barcode_length is now the actual number of "bars". */
for (i = 0; i < barcode_length; i++) {
if (barcode_data[i])
draw_vertical_bar_at_column(i);
}
```
Once you get `barcode_data`, each byte corresponds to whether a vertical
line should be drawn. If the byte is 0xff, then draw a line. If the byte is
0x00, then don't.
## Compiling and testing
The main library, `code128.[ch]`, doesn't have any dependencies. The test
program depends on `libpng`, so make sure to install that first. On
Debian/Ubuntu, run:
```sh
sudo apt install libpng-dev
```
On Windows, with MSYS2, run:
```sh
pacman -S --needed base-devel mingw-w64-x86_64-toolchain
pacman -S mingw-w64-x86_64-libpng
```
Details on how to install and setup MSYS2 environment on Windows can be found
[here](https://code.visualstudio.com/docs/languages/cpp) and
[here](https://www.freecodecamp.org/news/how-to-install-c-and-cpp-compiler-on-windows/) .
Then run `make`. The result is a test program that creates `png` files of
barcode data passed on the commandline.
On Windows, to build the libraries and the test program for different architectures,
you should open Powershell and run:
```sh
mingw-32-make.exe all
```
The regression tests require [zbar](http://zbar.sourceforge.net/). Install
`zbar` on Debian/Ubuntu by:
```sh
sudo apt install zbar-tools
```
Or on OSX:
```sh
brew install zbar
```
Then run `make check`.
## Integrating
If you're using C or C++, the easiest way of integrating this code into your
program is to just copy code128.[ch] to your tree. If you're not using C,
then calling `code128png` from your app may be an option as well.