diff --git a/compress-test/simple1.c b/compress-test/simple1.c
new file mode 100644
index 0000000..91bf565
--- /dev/null
+++ b/compress-test/simple1.c
@@ -0,0 +1,199 @@
+#include <assert.h>
+#include <blue/compress/compressor.h>
+#include <blue/compress/function.h>
+#include <blue/core/ringbuffer.h>
+#include <stdio.h>
+#include <string.h>
+
+#define BUF_SIZE 32
+
+int refill_input_buffer(FILE *fp, b_ringbuffer *dest)
+{
+	while (1) {
+		void *buf;
+		size_t capacity;
+		b_status status
+			= b_ringbuffer_open_write_buffer(dest, &buf, &capacity);
+		if (status == B_ERR_NO_SPACE) {
+			break;
+		}
+
+		if (!B_OK(status)) {
+			return -1;
+		}
+
+		size_t r = fread(buf, 1, capacity, fp);
+
+		b_ringbuffer_close_write_buffer(dest, &buf, r);
+
+		if (r == 0) {
+			return ferror(fp) ? -1 : 0;
+		}
+
+		if (r < capacity) {
+			break;
+		}
+	}
+
+	return 0;
+}
+
+int flush_output_buffer(FILE *fp, b_ringbuffer *src)
+{
+	while (1) {
+		void *buf;
+		size_t capacity;
+		b_status status
+			= b_ringbuffer_open_read_buffer(src, &buf, &capacity);
+		if (status == B_ERR_NO_DATA) {
+			break;
+		}
+
+		if (!B_OK(status)) {
+			return -1;
+		}
+
+		size_t w = fwrite(buf, 1, capacity, fp);
+
+		b_ringbuffer_close_read_buffer(src, &buf, w);
+
+		if (w < capacity) {
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+int main(int argc, const char **argv)
+{
+	if (argc < 4) {
+		fprintf(stderr, "usage: %s <C/D> <inpath> <outpath>\n", argv[0]);
+		return -1;
+	}
+
+	const b_compression_function *zstd
+		= b_compression_function_get_by_id(B_COMPRESSOR_FUNCTION_ZSTD);
+	if (!zstd) {
+		fprintf(stderr, "zstd support not enabled\n");
+		return -1;
+	}
+
+	b_compressor_mode mode;
+	if (!strcmp(argv[1], "C")) {
+		mode = B_COMPRESSOR_MODE_COMPRESS;
+	} else if (!strcmp(argv[1], "D")) {
+		mode = B_COMPRESSOR_MODE_DECOMPRESS;
+	} else {
+		fprintf(stderr, "invalid mode %s\n", argv[1]);
+		return -1;
+	}
+
+	size_t inbuf_size, outbuf_size;
+	b_compression_function_get_buffer_size(
+		zstd, mode, &inbuf_size, &outbuf_size);
+
+	b_ringbuffer *in = b_ringbuffer_create(inbuf_size);
+	b_ringbuffer *out = b_ringbuffer_create(outbuf_size);
+
+	if (!in || !out) {
+		fprintf(stderr, "memory allocation failure");
+		return -1;
+	}
+
+	FILE *in_fp = fopen(argv[2], "rb");
+	if (!in_fp) {
+		fprintf(stderr, "cannot open input file %s\n", argv[2]);
+		return -1;
+	}
+
+	FILE *out_fp = fopen(argv[3], "wb");
+	if (!out_fp) {
+		fclose(in_fp);
+		fprintf(stderr, "cannot open output file %s\n", argv[3]);
+		return -1;
+	}
+
+	b_compressor *compressor;
+	b_status status = b_compressor_create(zstd, mode, in, out, &compressor);
+	if (!B_OK(status)) {
+		fprintf(stderr, "cannot initialise compressor\n");
+		fclose(in_fp);
+		fclose(out_fp);
+		return -1;
+	}
+
+	int ret = 0;
+	while (1) {
+		ret = refill_input_buffer(in_fp, in);
+		if (ret != 0) {
+			fprintf(stderr, "read error\n");
+			break;
+		}
+
+		if (!b_ringbuffer_available_data_remaining(in)) {
+			break;
+		}
+
+		switch (mode) {
+		case B_COMPRESSOR_MODE_COMPRESS:
+			status = b_compressor_compress(compressor);
+			break;
+		case B_COMPRESSOR_MODE_DECOMPRESS:
+			status = b_compressor_decompress(compressor);
+			break;
+		}
+
+		if (status == B_ERR_NO_DATA) {
+			break;
+		} else if (status == B_ERR_NO_SPACE) {
+			ret = flush_output_buffer(out_fp, out);
+			if (ret != 0) {
+				fprintf(stderr, "write error\n");
+				break;
+			}
+		} else if (!B_OK(status)) {
+			ret = -1;
+			break;
+		}
+	}
+
+	ret = flush_output_buffer(out_fp, out);
+	if (ret != 0) {
+		fprintf(stderr, "write error\n");
+		return -1;
+	}
+
+	if (mode == B_COMPRESSOR_MODE_COMPRESS) {
+		while (!b_compressor_eof(compressor)) {
+			status = b_compressor_compress_end(compressor);
+			if (!B_OK(status)) {
+				fprintf(stderr,
+				        "compression finalisation error\n");
+				return -1;
+			}
+
+			if (!b_ringbuffer_available_data_remaining(out)) {
+				break;
+			}
+
+			ret = flush_output_buffer(out_fp, out);
+			if (ret != 0) {
+				fprintf(stderr, "write error\n");
+				return -1;
+			}
+		}
+	}
+
+	printf("Done\n");
+
+	b_compressor_destroy(compressor);
+
+	fclose(in_fp);
+	fclose(out_fp);
+
+	b_ringbuffer_destroy(in);
+	b_ringbuffer_destroy(out);
+
+	return ret;
+}