From cbcf86dde27767682483985e42f7ca49e1d3a208 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Date: Mon, 6 May 2019 11:00:49 +0200
Subject: Add LZO compressor implementation

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
 lib/Makemodule.am     |  7 +++++
 lib/comp/compressor.c |  3 +++
 lib/comp/internal.h   |  2 ++
 lib/comp/lzo.c        | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 83 insertions(+)
 create mode 100644 lib/comp/lzo.c

(limited to 'lib')

diff --git a/lib/Makemodule.am b/lib/Makemodule.am
index d174c99..aacec34 100644
--- a/lib/Makemodule.am
+++ b/lib/Makemodule.am
@@ -35,4 +35,11 @@ libcompress_a_CFLAGS += $(XZ_CFLAGS)
 libcompress_a_CPPFLAGS += -DWITH_XZ
 endif
 
+if WITH_LZO
+libcompress_a_SOURCES += lib/comp/lzo.c
+
+libcompress_a_CFLAGS += $(LZO_CFLAGS)
+libcompress_a_CPPFLAGS += -DWITH_LZO
+endif
+
 noinst_LIBRARIES += libfstree.a libcompress.a libutil.a libsquashfs.a
diff --git a/lib/comp/compressor.c b/lib/comp/compressor.c
index 1ede111..42ebd8b 100644
--- a/lib/comp/compressor.c
+++ b/lib/comp/compressor.c
@@ -12,6 +12,9 @@ static compressor_fun_t compressors[SQFS_COMP_MAX + 1] = {
 #ifdef WITH_XZ
 	[SQFS_COMP_XZ] = create_xz_compressor,
 #endif
+#ifdef WITH_LZO
+	[SQFS_COMP_LZO] = create_lzo_compressor,
+#endif
 };
 
 bool compressor_exists(E_SQFS_COMPRESSOR id)
diff --git a/lib/comp/internal.h b/lib/comp/internal.h
index d1cf1f2..3b24af0 100644
--- a/lib/comp/internal.h
+++ b/lib/comp/internal.h
@@ -8,4 +8,6 @@ compressor_t *create_xz_compressor(bool compress, size_t block_size);
 
 compressor_t *create_gzip_compressor(bool compress, size_t block_size);
 
+compressor_t *create_lzo_compressor(bool compress, size_t block_size);
+
 #endif /* INTERNAL_H */
diff --git a/lib/comp/lzo.c b/lib/comp/lzo.c
new file mode 100644
index 0000000..30b14cb
--- /dev/null
+++ b/lib/comp/lzo.c
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <lzo/lzo1x.h>
+
+#include "internal.h"
+
+typedef struct {
+	compressor_t base;
+
+	uint8_t buffer[LZO1X_999_MEM_COMPRESS];
+} lzo_compressor_t;
+
+static ssize_t lzo_comp_block(compressor_t *base, const uint8_t *in,
+			      size_t size, uint8_t *out, size_t outsize)
+{
+	lzo_compressor_t *lzo = (lzo_compressor_t *)base;
+	lzo_uint len = outsize;
+
+	if (lzo1x_999_compress(in, size, out, &len, lzo->buffer) != LZO_E_OK) {
+		fputs("lzo1x_999 failed. According to its "
+		      "manual, this shouldn't happen!\n", stderr);
+		return -1;
+	}
+
+	if (len < size)
+		return len;
+
+	return 0;
+}
+
+static ssize_t lzo_uncomp_block(compressor_t *base, const uint8_t *in,
+				size_t size, uint8_t *out, size_t outsize)
+{
+	lzo_compressor_t *lzo = (lzo_compressor_t *)base;
+	lzo_uint len = outsize;
+	int ret;
+
+	ret = lzo1x_decompress_safe(in, size, out, &len, lzo->buffer);
+
+	if (ret != LZO_E_OK) {
+		fputs("lzo decompress: input data is corrupted\n", stderr);
+		return -1;
+	}
+
+	return len;
+}
+
+static void lzo_destroy(compressor_t *base)
+{
+	free(base);
+}
+
+compressor_t *create_lzo_compressor(bool compress, size_t block_size)
+{
+	lzo_compressor_t *lzo = calloc(1, sizeof(*lzo));
+	compressor_t *base = (compressor_t *)lzo;
+	(void)block_size;
+
+	if (lzo == NULL) {
+		perror("creating lzo compressor");
+		return NULL;
+	}
+
+	base->destroy = lzo_destroy;
+	base->do_block = compress ? lzo_comp_block : lzo_uncomp_block;
+	return base;
+}
-- 
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