pub const extern "C" fn zlibCompileFlags() -> c_ulongExpand description
Return flags indicating compile-time options.
Type sizes, two bits each, 0b00 = 16 bits, 0b01 = 32, 0b10 = 64, 0b11 = other:
| bits | description |
|---|---|
0..=1 | size of uInt |
2..=3 | size of uLong |
4..=5 | size of voidpf (pointer) |
6..=7 | size of z_off_t |
Compiler, assembler, and debug options:
| bits | flag | description |
|---|---|---|
8 | ZLIB_DEBUG | debug prints are enabled |
9 | ASMV or ASMINF | use ASM code |
10 | ZLIB_WINAPI | exported functions use the WINAPI calling convention |
11 | reserved |
One-time table building (smaller code, but not thread-safe if true):
| bits | flag | description |
|---|---|---|
12 | BUILDFIXED | build static block decoding tables when needed |
13 | DYNAMIC_CRC_TABLE | build CRC calculation tables when needed |
14 | reserved | |
15 | reserved |
Library content (indicates missing functionality):
| bits | flag | description |
|---|---|---|
16 | NO_GZCOMPRESS | gz* functions cannot compress (to avoid linking deflate code when not needed) |
17 | NO_GZIP | deflate can’t write gzip streams, and inflate can’t detect and decode gzip streams (to avoid linking crc code) |
18 | reserved | |
19 | reserved |
Operation variations (changes in library functionality):
| bits | flag | description |
|---|---|---|
20 | PKZIP_BUG_WORKAROUND | slightly more permissive inflate |
21 | FASTEST | deflate algorithm with only one, lowest compression level |
22 | reserved | |
23 | reserved |
The sprintf variant used by gzprintf (zero is best):
| bits | value | description |
|---|---|---|
24 | 0 = vs*, 1 = s* | 1 means limited to 20 arguments after the format |
25 | 0 = *nprintf, 1 = *printf | 1 means gzprintf not secure! |
26 | 0 = returns value, 1 = void | 1 means inferred string length returned |
Remainder:
The remaining bits 27..=31 are 0 (reserved).