diff --git a/include/comp/compressor.h b/include/comp/compressor.h
index ef6c16e..da1a3a3 100644
--- a/include/comp/compressor.h
+++ b/include/comp/compressor.h
@@ -16,10 +16,6 @@ typedef struct compressor_stream_t {
 
 	void (*flush)(struct compressor_stream_t *stream);
 
-	ssize_t (*do_block)(struct compressor_stream_t *stream,
-			    const uint8_t *in, uint8_t *out,
-			    size_t insize, size_t outsize);
-
 	void (*destroy)(struct compressor_stream_t *stream);
 } compressor_stream_t;
 
diff --git a/lib/comp/lzma.c b/lib/comp/lzma.c
index 2624f2c..877e717 100644
--- a/lib/comp/lzma.c
+++ b/lib/comp/lzma.c
@@ -93,65 +93,6 @@ static void lzma_flush(compressor_stream_t *base)
 	lzma->action = LZMA_FINISH;
 }
 
-static ssize_t lzma_comp_block(compressor_stream_t *base,
-			       const uint8_t *in, uint8_t *out,
-			       size_t insize, size_t outsize)
-{
-	lzma_stream_t *lzma = (lzma_stream_t *)base;
-	lzma_filter filters[5];
-	lzma_options_lzma opt;
-	size_t written = 0;
-	lzma_ret ret;
-
-	if (lzma_lzma_preset(&opt, LZMA_PRESET_DEFAULT)) {
-		fputs("error initializing LZMA options\n", stderr);
-		return -1;
-	}
-
-	if (lzma->dict_size)
-		opt.dict_size = lzma->dict_size;
-
-	filters[0].id = LZMA_FILTER_LZMA2;
-	filters[0].options = &opt;
-
-	filters[1].id = LZMA_VLI_UNKNOWN;
-	filters[1].options = NULL;
-
-	ret = lzma_stream_buffer_encode(filters, LZMA_CHECK_CRC32, NULL,
-					in, insize, out, &written, outsize);
-
-	if (ret == LZMA_OK)
-		return written;
-
-	if (ret != LZMA_BUF_ERROR) {
-		fputs("lzma block compress failed\n", stderr);
-		return -1;
-	}
-
-	return 0;
-}
-
-static ssize_t lzma_uncomp_block(compressor_stream_t *base,
-				 const uint8_t *in, uint8_t *out,
-				 size_t insize, size_t outsize)
-{
-	uint64_t memlimit = 32 * 1024 * 1024;
-	size_t dest_pos = 0;
-	size_t src_pos = 0;
-	lzma_ret ret;
-	(void)base;
-
-	ret = lzma_stream_buffer_decode(&memlimit, 0, NULL,
-					in, &src_pos, insize,
-					out, &dest_pos, outsize);
-
-	if (ret == LZMA_OK && insize == src_pos)
-		return (ssize_t)dest_pos;
-
-	fputs("lzma block extract failed\n", stderr);
-	return -1;
-}
-
 static void lzma_destroy(compressor_stream_t *base)
 {
 	lzma_stream_t *lzma = (lzma_stream_t *)base;
@@ -198,12 +139,8 @@ static compressor_stream_t *create_stream(bool compress, size_t dict_size)
 
 		ret = lzma_stream_encoder(&lzma->strm, filters,
 					  LZMA_CHECK_CRC32);
-
-		base->do_block = lzma_comp_block;
 	} else {
 		ret = lzma_stream_decoder(&lzma->strm, UINT64_MAX, 0);
-
-		base->do_block = lzma_uncomp_block;
 	}
 
 	if (ret != LZMA_OK)
diff --git a/lib/comp/none.c b/lib/comp/none.c
index 539ba72..53a01ee 100644
--- a/lib/comp/none.c
+++ b/lib/comp/none.c
@@ -52,19 +52,6 @@ static ssize_t dummy_read(compressor_stream_t *base,
 	return size;
 }
 
-static ssize_t dummy_do_block(compressor_stream_t *base,
-			      const uint8_t *in, uint8_t *out,
-			      size_t insize, size_t outsize)
-{
-	(void)base;
-
-	if (outsize < insize)
-		return 0;
-
-	memcpy(out, in, insize);
-	return insize;
-}
-
 static void dummy_flush(compressor_stream_t *base)
 {
 	(void)base;
@@ -91,7 +78,6 @@ static compressor_stream_t *create_dummy_stream(compressor_t *cmp,
 	base->write = dummy_write;
 	base->read = dummy_read;
 	base->flush = dummy_flush;
-	base->do_block = dummy_do_block;
 	base->destroy = dummy_destroy;
 	return base;
 }
diff --git a/lib/comp/zlib.c b/lib/comp/zlib.c
index 6f7c2db..28fc581 100644
--- a/lib/comp/zlib.c
+++ b/lib/comp/zlib.c
@@ -112,46 +112,6 @@ static void zlib_destroy(compressor_stream_t *base)
 	free(zlib);
 }
 
-static ssize_t zlib_do_block(compressor_stream_t *base,
-			     const uint8_t *in, uint8_t *out,
-			     size_t insize, size_t outsize)
-{
-	zlib_stream_t *zlib = (zlib_stream_t *)base;
-	int ret;
-
-	if (zlib->compress) {
-		ret = deflateReset(&zlib->strm);
-	} else {
-		ret = inflateReset(&zlib->strm);
-	}
-
-	if (ret != Z_OK) {
-		fputs("resetting zlib stream failed\n", stderr);
-		return -1;
-	}
-
-	zlib->strm.next_in = (void *)in;
-	zlib->strm.avail_in = insize;
-	zlib->strm.next_out = out;
-	zlib->strm.avail_out = outsize;
-
-	if (zlib->compress) {
-		ret = deflate(&zlib->strm, Z_FINISH);
-	} else {
-		ret = inflate(&zlib->strm, Z_FINISH);
-	}
-
-	if (ret == Z_STREAM_END)
-		return (ssize_t)zlib->strm.total_out;
-
-	if (ret != Z_OK) {
-		fputs("zlib block processing failed\n", stderr);
-		return -1;
-	}
-
-	return 0;
-}
-
 static compressor_stream_t *create_stream(bool compress)
 {
 	zlib_stream_t *zlib = calloc(1, sizeof(*zlib));
@@ -170,7 +130,6 @@ static compressor_stream_t *create_stream(bool compress)
 	base->write = zlib_write;
 	base->read = zlib_read;
 	base->flush = zlib_flush;
-	base->do_block = zlib_do_block;
 	base->destroy = zlib_destroy;
 
 	if (compress) {