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zlib
Abhishek Panse
Abhishek Panse

Reputation: 11

Zlib Calling deflateInit function always returning Z_MEM_ERROR

I am using zlib-1.2.8 and I am calling compress2(dest, destLen, source, sourceLen, level) from compress.c in my code for compressing the data.

The function compress2 (dest, destLen, source, sourceLen, level) is calling deflateInit(&stream, level);

deflateInit is macro.

#define deflateInit(strm, level) \
    deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream))

That is compress2 is calling deflateInit_. My Problem is deflateInit_ is returning Z_MEM_ERROR.

I am trying to debug inside deflateInit_ but not got any debug messages that I have put there.

Also I commented all the exising code inside function deflateInit_ and return different error from the function ie Z_BUF_ERROR but still deflateInit_ is returning Z_MEM_ERROR. Here if I am explicty returing Z_BUF_ERROR still I am getting Z_MEM_ERROR.

Please give me some pointers behind this behaviour.

Upvotes: 0

Views: 1738

Answers (1)

Mark Adler
Mark Adler

Reputation: 112374

It means what it says. zlib is calling malloc(), which is returning NULL. That is presumably because there is not enough memory availabel to malloc() to honor the request. deflate with the default parameters needs to allocate about 260K to function.

Upvotes: 1

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