CODEWITHSUNDEEP
flashactionscript-3alchemy
Nakul
Nakul

Reputation: 1600

using flashzlib into flash project

I am integrating flashzlib into one of my flash project. As mentioned in documentation of project. I have successfully generated libz.a and z.l.bc and pushed libs and headers in appropriate places.

Now, I have written this small wrapper https://gist.github.com/65d3c7ff683b326ecd22. This compiles just fine using:

gcc example1_as3.c -lz -O3 -Wall -swc -o example.swc

This is included into flash project like this (uncompressedData is a byteArray):

private var loader:CLibInit = new CLibInit;
private var lib:Object = loader.init();
logger.info("B : " + lib.returnString(uncompressedData, uncompressedData.length) + "");

But flash file fails at this last line. Am not sure what am i missing. z.l.bc file is 340KB while example.swc is just 80KB.

Upvotes: 0

Views: 173

Answers (1)

Gunslinger47
Gunslinger47

Reputation: 7061

­It's failing for one of two reasons. Either Alchemy isn't finding z.l.bc (and isn't bothering to tell you about it), or you're not catching and reporting your error codes correctly.

As I mentioned in the question comments, I was getting a runtime error on the inflateInit invocation. For my case, it turned out that Alchemy wasn't searching $ALCHEMY_HOME/usr/local/lib for z.l.bc like it was supposed to be. This was solved by moving it to /usr/local/lib instead. After that, your code returned Z_OK as expected.

I notice you have all the CHECK_ERR calls commented out, which means that you'll enter an infinite loop if you comment out the early return on example.c:52 since you're not checking for errors on your inflate call in the following unconditional for block. For me, inflate was returning Z_DATA_ERROR since I was just handing it some UTF bytes for test purposes.

Speaking of testing, I notice that there's a small test suite supplied by flashzlib:

I borrowed this code, renamed main to test_all, commented out the call to test_gzio¹, and replaced all printf calls with fprintf calls to stderr instead². This is the result:

zlib version 1.2.3 = 0x1230, compile flags = 0x2000095

uncompress(): hello, hello!

inflate(): hello, hello!

large_inflate(): OK

after inflateSync(): hello, hello!

inflate with dictionary: hello, hello! 

0

Everything appears to be in order.


footnotes:
¹ No file access in Alchemy, of course.
² stdout is disconnected for me, but stderr appears in my trace console

Upvotes: 1

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