Compile with Zlib

[Davide Mercanti]

I don't understand how I can set up a project to use zlib (USE_ZLIB=1) with MSVC 2019 and cmake.

Is am example project available?

These are my outputs

D:\MERCHANTS\em\emsdk\upstream\emscripten\em++.bat -ID:/MERCHANTS/em/emsdk/upstream/emscripten/system/include -g -MD -MT CMakeProject1/CMakeFiles/CMakeProject1.dir/CMakeProject1.cpp.o -MF CMakeProject1\CMakeFiles\CMakeProject1.dir\CMakeProject1.cpp.o.d -o CMakeProject1/CMakeFiles/CMakeProject1.dir/CMakeProject1.cpp.o -c ../../../CMakeProject1/CMakeProject1.cpp
 [2/2] cmd.exe /C "cd . && D:\MERCHANTS\em\emsdk\upstream\emscripten\em++.bat -g --bind -s USE_ZLIB=1 -s EXPORT_ALL=1 -s WASM=1 -s ALLOW_MEMORY_GROWTH=1 -s FORCE_FILESYSTEM=1 -s EXPORTED_RUNTIME_METHODS=['ccall','cwrap'] -s EXPORTED_FUNCTIONS=['_print_file','_testdouble_array','_malloc','_free','_unzip_file'] CMakeProject1/CMakeFiles/CMakeProject1.dir/CMakeProject1.cpp.o -o CMakeProject1\MyFirstWASM.html && cd .'
 FAILED: CMakeProject1/MyFirstWASM.html
 cmd.exe /C "cd . && D:\MERCHANTS\em\emsdk\upstream\emscripten\em++.bat -g --bind -s USE_ZLIB=1 -s EXPORT_ALL=1 -s WASM=1 -s ALLOW_MEMORY_GROWTH=1 -s FORCE_FILESYSTEM=1 -s EXPORTED_RUNTIME_METHODS=['ccall','cwrap'] -s EXPORTED_FUNCTIONS=['_print_file','_testdouble_array','_malloc','_free','_unzip_file'] CMakeProject1/CMakeFiles/CMakeProject1.dir/CMakeProject1.cpp.o -o CMakeProject1\MyFirstWASM.html && cd ."
D:\MERCHANTS\em\sources\CMakeProject1\out\build\x64-Debug\CMakeProject1\wasm-ld : error : CMakeProject1/CMakeFiles/CMakeProject1.dir/CMakeProject1.cpp.o: undefined symbol: zip_open
D:\MERCHANTS\em\sources\CMakeProject1\out\build\x64-Debug\CMakeProject1\wasm-ld : error : CMakeProject1/CMakeFiles/CMakeProject1.dir/CMakeProject1.cpp.o: undefined symbol: zip_get_num_entries
D:\MERCHANTS\em\sources\CMakeProject1\out\build\x64-Debug\CMakeProject1\wasm-ld : error : CMakeProject1/CMakeFiles/CMakeProject1.dir/CMakeProject1.cpp.o: undefined symbol: zip_stat_index
D:\MERCHANTS\em\sources\CMakeProject1\out\build\x64-Debug\CMakeProject1\wasm-ld : error : CMakeProject1/CMakeFiles/CMakeProject1.dir/CMakeProject1.cpp.o: undefined symbol: zip_close

[Sam Clegg]

Those undefined symbols looks like they come from libzip, rather than zlib: https://libzip.org/documentation/zip_get_num_entries.html

That means you will likely need to compile libzip and link it into your project rather than using `-sUSE_ZLIB`.

cheers,

sam

 

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[Mercp]

Thank you.  So zlib can't access zip file entries?  Has libzip never been linked?

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[Brooke Vibber]

On Thu, Oct 31, 2024 at 11:44 AM Mercp <d.mer...@gmail.com> wrote:

Thank you.  So zlib can't access zip file entries?  Has libzip never been linked?

zlib handles gzip files: https://zlib.net/

libzip handles zip files: https://libzip.org/

You can probably compile libzip fairly straightforwardly, then link it into your project just as you would any other library.

-- brooke

[Mercp]

Ok. I've compiled libzip.

I can read entries names but how can I pass buffer to Javascript for this C function?

int zipG(const char* zip_file_name, char* ZipBuf2) {
        int v1=zip_entry_opencasesensitive(gloablZip, zip_file_name);
        cout << v1 << endl;
        zip_entry_read(gloablZip, (void**)&ZipBuf2, &ZipBuf_size);

            cout << ZipBuf_size << endl;
        return 0;
    }

in JS:

var myBuffer= cArray8(32000)

Module.ccall('zipG', 'number', ['string','number'], ['model.dat',myBuffer.offset]);

function cArray8(size) {
    var offset = Module._malloc(size * 1);
    Module.HEAP8.set(new Uint8Array(size), offset / 1);
    return {
"data": Module.HEAP8.subarray(offset / 1, offset / 1 + size),
"offset": offset
}
};

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