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View Code? Open in Web Editor NEWGS1 Syntax Engine
License: Apache License 2.0
GS1 Syntax Engine
License: Apache License 2.0
Housekeeping to capture discussion that occurred in PR#4 as a separate issue to allow that PR to be closed...
2024/04/09: @terryburton
The major decision to be made is whether to publish a Java and/or Android library, and where to. My intent so far has been to release a Java library package consisting of a single multi-architecture JAR published on Maven Central. The reasoning is that this benefits all Java developers and if there is no Android app specific helper code in the library then there is little point in also creating and maintaining an Android library — but I'm happy to be educated if this analysis is lacking.
(Because the library is based on native C code, it must be compiled for each of the common target architectures, e.g. x64, x86, arm, arm64. Creating multi-architecture Java library packages is challenging, but there are projects that appear to do this successfully, e.g. https://github.com/OddSource/ifaddrs4u/tree/main/ifaddrs4j)
2024/04/18: @vinaygopinath
... I'm on board with your proposal of publishing a JAR accessible from Maven Central purely to parse the scanned string, leaving the task of scanning codes to the application developer.
2024/04/19: @terryburton
Thank you for taking the time to consider the approach that I outlined concerning the multi-architecture JAR. I conducted some brief testing, but I have had to set things aside for now because of the amount of effort involved. It may be prioritised in the future as a result of community feedback such as what you have provided.
Building the multi-architecture JAR:
How the JAR would work:
System.load
the correct JNI library for the platform — hopefully all relevant platforms can be detected reliably so that a single JAR is all that is necessary.System.load
the native code it is necessary for the custom class loader to first copy it out of the JAR to temporary storage. This seems to work well for regular Java platforms, at least on Linux which I have tested.Considerations for Android:
.so
files are stripped out of the APK during the build, i.e. the JAR doesn't appear to be manifested in the same way once the app is assembled. I haven't looked at how and why this occurs.System.load
what the application has written at runtime.lib/
location (e.g. lib/arm64
) so that it gets built into the APK in that same way that a "vendored-in" shared library (or output of an NDK build step) would be, such that it is accessible to the app at runtime. The custom class loader would need to be programmed to not attempt library extraction when running on Android and when the library can be loaded from the default native library location for the current platform.implementation
dependency you would also need to add a task to the gradle.build
, which sounds like it may be preferable to vendoring in the Syntax Engine code in the way shown by the current example Android app.That's a lot of steps to put in order and there is still some risk of something critical not working out as intended, so the idea is shelved for now...
Of course if anyone would like to have a go at the above then this will be welcome.
Could you please add documentation to the README on how to use the Java wrapper? I see build.xml
in the java subfolder. Is this wrapped intended to be used by the Ant build system?
For context, I'm trying to use the Java wrapper from a Gradle-based Android project. @terryburton Reading through #4, it sounds like publishing a multi-architecture JAR on Maven is/was being considered. Is that still on the cards? I wasn't able to find this library on Maven Central.
My intent so far has been to release a Java library package consisting of a single multi-architecture JAR published on Maven Central
char* gs1_encoder_getDLuri(gs1_encoder *ctx, char *stem);
should be changed to char* gs1_encoder_getDLuri(gs1_encoder *ctx, const char *stem);
to allow passing const char pointers to stem URIs.Hi, you can publish js/nodejs code in npm?
i am trying do develop and app to read GS1 barcodes, and the only one i can't read is GS1 databar, my app is written in javascript and uses zbar and zxing in parallel, i've tried opencv as wall but no success, i've tested literally hundreds of apps and tools online for gs1 and none of them can read databar except for a japanese app called "添文ナビ"...
can somebody please help me ? anything could help ....
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