zlib compressed file (.zzz)

ZZZ File

Files suffixed with the .zzz extension are compressed files using zlib. The decompressed file size are the first 4 bytes, with the remainder of the file being the compressed data.

Sample Decompression Program

An example program to decompress a .zzz file.

#include "miniz.h"

void decompress_file(FILE* compressedFile)
{
	uint32_t decompressedSize, compressedSize;
	void *decompressedData, *compressedData;

	// get the total size of the compressed section
	fseek(compressedFile, 0, SEEK_END);
	compressedSize = ftell(compressedFile) - 4;

	// the first 4 bytes tell us how big the file is decompressed
	fseek(compressedFile, 0, SEEK_SET);
	fread(&decompressedSize, 4, 1, compressedFile);

	// allocate buffers for the data
	decompressedData = malloc(decompressedSize);
	compressedData = malloc(compressedSize);

	// read in the compressed data
	fread(compressedData, compressedSize, 1, compressedFile);
	
	int code = uncompress(decompressedData, &decompressedSize, compressedData, compressedSize);
	return code;
}

In python:

import zlib

with open("SF_Wood_txt.zzz", "rb") as f:
  size = int.from_bytes(f.read(4), byteorder='little')
  zlib_data = f.read(size)

data = zlib.decompress(zlib_data)
print(data.decode())

In bash:

$ dd if=SF_Wood_txt.zzz bs=4096 skip=4 iflag=skip_bytes | zlib-flate -uncompress