Zlib可输出三种业态 ，我尝试搜索的文档和zlib.h ，却找不到有关选项解释清楚，任何人有什么想法？
Answer 1:
从zlib.h的文档deflateInit2()
windowBits can also be -8..-15 for raw deflate. In this case, -windowBits
determines the window size. deflate() will then generate raw deflate data
with no zlib header or trailer, and will not compute a check value.
windowBits can also be greater than 15 for optional gzip encoding. Add
16 to windowBits to write a simple gzip header and trailer around the
compressed data instead of a zlib wrapper.
Answer 2:
填空
int get_file_format(int n) {
if (n == 0) return 31;
else if (n == 1) return 15;
else if (n == 2) return -15;
else if (n >= 9 && n <= 15) return n; /* zlib with window size 2^9 to 2^15 */
else if (n >= 25 && n <= 31) return n; /* gzip with window size 2^9 to 2^15 */
else if (n >= -15 && n <= -9)return n; /* raw with window size 2^9 to 2^15 */
else return Z_ERRNO;
}
z_hist_sz = get_file_format(n);
ret = deflateInit2(&strm, COMPRESS_LEVEL, Z_DEFLATED, z_hist_sz ...)
文章来源: How to change deflate stream output format(raw, zlib, gzip) when use zlib?
