好手在否－iOS gzip无法解压缩

高手在否－iOS gzip无法解压缩，
服务端请求到的xml是（服务端是用java写的）：<ns1:out>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</ns1:out>
小弟用xml解析后得到：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
在用base64 解密得到：<1fc28b08 00000000 000000c2 adc3944d 4b024118 07c3b0c3 afc2b267 c2897979 c3a6c38d c39bc292 c288c2b0 1e443b28 1121c2b5 c284c2a0 26690711 2fc295c2 91c287c2 a8c2a053 792a3ac2 b61144c3 920bc3b5 65c39a5d c3bc16c2 8d48c290 30632c79 c29c6706 7e3c0fc3 bf677ac3 8ec28ec3 9f71c3ab 。。。。。。。。
然后就是用gzip解压缩了代码如下：
————————————问题来了 ————————————————————完美分割————————————————————————————求关注——————————————————————————
-(NSData *)uncompressZippedData:(NSData *)compressedData  {

if ([compressedData length] == 0) return compressedData;

    unsigned full_length = [compressedData length];

    unsigned half_length = [compressedData length] / 2;

    NSMutableData *decompressed = [NSMutableData dataWithLength: full_length + half_length];

    BOOL done = NO;

    int status;

    z_stream strm;

    strm.next_in = (Bytef *)[compressedData bytes];

    strm.avail_in = [compressedData length];

    strm.total_out = 0;

    strm.zalloc = Z_NULL;

    strm.zfree = Z_NULL;

    if (inflateInit2(&strm, (15+32)) != Z_OK) return nil;

    while (!done) {
        // Make sure we have enough room and reset the lengths.
        if (strm.total_out >= [decompressed length]) {
            [decompressed increaseLengthBy: half_length];
        }
        strm.next_out = [decompressed mutableBytes] + strm.total_out;
        strm.avail_out = [decompressed length] - strm.total_out;
        // Inflate another chunk.
        status = inflate (&strm, Z_SYNC_FLUSH);
／／这里 一直返回－3 errordata  ，旧是这问题了，怎么弄啊
        if (status == Z_STREAM_END) {
            done = YES;
        } else if (status != Z_OK) {
            break;
        }
    }
    if (inflateEnd (&strm) != Z_OK) return nil;
    // Set real length.
    if (done) {
        [decompressed setLength: strm.total_out];
        return [NSData dataWithData: decompressed];
    } else {
        return nil;
    }
}