29 lines
694 B
C
29 lines
694 B
C
|
#pragma once
|
||
|
|
|
||
|
|
#include <zlib.h>
|
||
|
|
|
||
|
|
bool compress_string(const std::string& str, std::string *dest, int compressionlevel = Z_BEST_COMPRESSION);
|
||
|
|
bool decompress_string(const std::string& str, std::string *dest);
|
||
|
|
|
||
|
|
|
||
|
|
// Delta encoding/decoding - many formats benefit from a pass of this before zlibbing.
|
||
|
|
// WARNING : Do not use these with floating point data, especially not float16...
|
||
|
|
|
||
|
|
template <class T>
|
||
|
|
inline void delta(T *data, int length) {
|
||
|
|
T prev = data[0];
|
||
|
|
for (int i = 1; i < length; i++) {
|
||
|
|
T temp = data[i] - prev;
|
||
|
|
prev = data[i];
|
||
|
|
data[i] = temp;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class T>
|
||
|
|
inline void dedelta(T *data, int length) {
|
||
|
|
for (int i = 1; i < length; i++) {
|
||
|
|
data[i] += data[i - 1];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|