LZNT1-inflate-example.c

#include <stdio.h>  // for FILE, fread, fwrite, feof
#include <assert.h> // for assertion checks

#include <lznt1.h>  // mscomp LZNT1 header

#define BUF_SIZE 65536

/* TODO: probably use a return value for error handling or something */
void inflate(FILE *source, FILE *dest)
{
	MSCompStatus status;
	bool finish;
	size_t have;
	mscomp_stream strm;	
	byte in[BUF_SIZE];
	byte out[BUF_SIZE];

	status = lznt1_inflate_init(&strm);
	if (status != MSCOMP_OK) { /* TODO: deal with error in status */ }

	// decompress until end of file
	do {
		strm.in_avail = fread(in, 1, BUF_SIZE, source);
		if (ferror(source))
		{
			lznt1_inflate_end(&strm);
			/* TODO: deal with error reading file */
		}
		finish = feof(source) != 0;
		strm.in = in;

		// run inflate() on input until output buffer not full, finish compression if all of source has been read in
		do
		{
			strm.out_avail = BUF_SIZE;
			strm.out = out;
			status = lznt1_inflate(&strm);
			if (status < MSCOMP_OK)
			{
				lznt1_inflate_end(&strm);
				/* TODO: deal with error in status */
			}
			have = BUF_SIZE - strm.out_avail;
			if (fwrite(out, 1, have, dest) != have || ferror(dest))
			{
				lznt1_inflate_end(&strm);
				/* TODO: deal with error writing file */
			}
		} while (strm.out_avail == 0);
		assert(strm.in_avail == 0);	// all input will be used

		// done when last data in file processed
	} while (!finish);
	assert(status == MSCOMP_STREAM_END || status == MSCOMP_POSSIBLE_STREAM_END); // stream will be complete

	// clean up and return
	status = lznt1_inflate_end(&strm);
	if (status != MSCOMP_OK) { /* TODO: deal with error in status */ }
}