rle.cpp

来自「Huffman/RLE archivator」· C++ 代码 · 共 53 行

#include "stdafx.h"
#include "compressing.h"
#include <fcntl.h>
#include <io.h>


void CompressRLE(CString fileName, CString archName)
{
	FILE *in = _wfopen(fileName, L"rb"); 
	FILE *out = _wfopen(archName, L"wb");
	unsigned char current;
	unsigned char prev;

	unsigned char counter = 0;
	int flag = fread(&prev, 1, 1, in);
	current = prev;
	while (flag > 0)
	{
		while (counter!=255 && current==prev && flag>0)
		{
			flag = fread(&current, 1, 1, in);
			counter++;
		}
		if (flag < 0)
			break;
		else 
		{
			fwrite(&counter, 1, 1, out);
			fwrite(&prev, 1, 1, out);
			counter = 0;
		}
		prev = current;
	}
	fclose(in);
	fclose(out);
}

void DecompressRLE(CString archName, CString fileName)
{
	FILE *in = _wfopen(archName, L"rb"); 
	FILE *out = _wfopen(fileName, L"wb");
	unsigned char count = 0;
	unsigned char symbol = 0;
	while (fread(&count, 1, 1, in) > 0)
	{
		fread(&symbol, 1, 1, in);
		for (int i=0; i < count; i++)
			fwrite(&symbol, 1, 1, out);
	}
	fclose(in);
	fclose(out);
}