zlib doesn't fail anymore on the bug 52944, so the test out is adopted

i've just realized, that the output is different on linux ... the thing needs probably more investigation

What happens here is most likely a zlib issue. After a lot of debugging I came up with the snippet to look what happens if php is completely ommited (just quickly adopted some code from the net):

======================= START SNIPPET ===================================
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <zlib.h>

#define CHUNK 0x4000

int main ()
{
    const char * file_name = "corrupted.gz";
    FILE * file;
    z_stream strm = {0};
    unsigned char in[CHUNK];
    unsigned char out[CHUNK];
    int status;

    strm.zalloc = Z_NULL;
    strm.zfree = Z_NULL;
    strm.opaque = Z_NULL;
    strm.next_in = in;
    strm.avail_in = 0;
    strm.next_out = out;

    status = inflateInit2(&strm, -15);
    if (0 > status) {
	fprintf(stderr, "inflateInit2(): %s\n", zError(status));
	return 3;
    }

    file = fopen(file_name, "rb");
    if (!file) {
	fprintf(stderr, "fopen(): %s\n", strerror(errno));
	return 3;
    }
    while (1) {
        int bytes_read;

        bytes_read = fread(in, sizeof(char), sizeof(in), file);
        if (ferror(file)){
		fprintf(stderr, "fread(): %s\n", strerror(errno));
		return 3;
	}
        strm.avail_in = bytes_read;
        do {
            strm.avail_out = CHUNK;

            status = inflate(& strm, Z_NO_FLUSH);
	    if (0 > status) {
	        inflateEnd(&strm);
		fprintf(stderr, "inflate(): %s\n", zError(status));
		return 1;
	    }

            printf("%s", out);
        }
        while (strm.avail_out == 0);
        if (feof(file)) {
            inflateEnd(&strm);
            break;
        }
    }
    if (fclose(file)) {
	fprintf(stderr, "fclose(): %s\n", strerror(errno));
	return 3;
    }
    return 0;
}

======================= END SNIPPET =====================================

I've used the data from the original bug which is still available under http://188.40.74.4/corrupted.gz and then compiled it on windows 


cl inflate.c C:\php-sdk\php53\vc9\x86\deps\lib\zlib_a.lib "C:\Program Files\Microsoft Visual Studio 10.0\VC\lib\msvcrt.lib" /I C:\php-sdk\php53\vc9\x86\deps\include

and linux

gcc -o inflate inflate.c -lz

The result is pretty matching, the out on windows gives 

%Cë

and on linux

inflate(): data error

So PHP. 

In both of my tests PHP reports zlib version of 1.2.5 . Despite this we could try to upgrade the zlib version for PHP on windows and see what happens.

skip this test on windows until zlib dep was upgraded to 1.2.7