1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
#ifndef BYTEME_MAGIC_NUMBERS_HPP
#define BYTEME_MAGIC_NUMBERS_HPP
namespace byteme {
template<typename T>
bool is_zlib(const T* values, size_t n) {
if (n >= 2 && static_cast<unsigned char>(values[0]) == 0x78) {
auto level = static_cast<unsigned char>(values[1]);
// From https://en.wikipedia.org/wiki/List_of_file_signatures
if (level == 0x01 || level == 0x5e || level == 0x9c || level == 0xda || level == 0x20 || level == 0x7d || level == 0xbb || level == 0xf9) {
return true;
}
}
return false;
}
template<typename T>
bool is_gzip(const T* values, size_t n) {
// ommitting the 0x08 requirement as Gzip could be used with non-DEFLATE algorithms.
return (n >= 2 && static_cast<unsigned char>(values[0]) == 0x1f && static_cast<unsigned char>(values[1]) == 0x8b);
}
}
#endif
|
