|
|
|
@ -9,25 +9,13 @@
|
|
|
|
|
* @tparam data Expected to be a null-terminated `char` of data to be compressed.
|
|
|
|
|
*/
|
|
|
|
|
template<auto data>
|
|
|
|
|
struct huffman_compress
|
|
|
|
|
class huffman_compress
|
|
|
|
|
{
|
|
|
|
|
using size_t = unsigned long int;
|
|
|
|
|
|
|
|
|
|
// Contains the compressed data.
|
|
|
|
|
unsigned char output[size()] = {};
|
|
|
|
|
// Contains a 'tree' that can be used to decompress the data.
|
|
|
|
|
unsigned char decode_tree[3 * tree_count()] = {};
|
|
|
|
|
|
|
|
|
|
// Returns the size of the compressed data, in bytes.
|
|
|
|
|
consteval static auto size() { return output_size().first; }
|
|
|
|
|
// Returns how many of the bits in the last byte of `output` are actually part of the data.
|
|
|
|
|
consteval static auto lastbitscount() { return output_size().second; }
|
|
|
|
|
|
|
|
|
|
consteval huffman_compress() {
|
|
|
|
|
build_decode_tree();
|
|
|
|
|
compress();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// The internals for this class needed to be defined before they're used in
|
|
|
|
|
// the public interface. Scroll to the next `public` section for usable variables/functions.
|
|
|
|
|
private:
|
|
|
|
|
// Node structure used for tree-building.
|
|
|
|
|
struct node {
|
|
|
|
|
int value = 0;
|
|
|
|
@ -160,6 +148,22 @@ struct huffman_compress
|
|
|
|
|
}
|
|
|
|
|
delete[] tree.data();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public:
|
|
|
|
|
// Returns the size of the compressed data, in bytes.
|
|
|
|
|
consteval static auto size() { return output_size().first; }
|
|
|
|
|
// Returns how many of the bits in the last byte of `output` are actually part of the data.
|
|
|
|
|
consteval static auto lastbitscount() { return output_size().second; }
|
|
|
|
|
|
|
|
|
|
// Contains the compressed data.
|
|
|
|
|
unsigned char output[size()] = {};
|
|
|
|
|
// Contains a 'tree' that can be used to decompress the data.
|
|
|
|
|
unsigned char decode_tree[3 * tree_count()] = {};
|
|
|
|
|
|
|
|
|
|
consteval huffman_compress() {
|
|
|
|
|
build_decode_tree();
|
|
|
|
|
compress();
|
|
|
|
|
}
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
#endif // TCSULLIVAN_CONSTEVAL_HUFFMAN_HPP_
|
|
|
|
|