[WIP] [PATCH 09/12] erofs-utils: fuse: rename ofs_head and outputsize

[Gao Xiang]

[ let's fold in to the original patch. ]
Signed-off-by: Gao Xiang <hsiangkao at aol.com>
---
 fuse/decompress.c | 27 +++++++++++++--------------
 fuse/decompress.h |  8 ++++++--
 fuse/read.c       |  4 ++--
 3 files changed, 21 insertions(+), 18 deletions(-)

diff --git a/fuse/decompress.c b/fuse/decompress.c
index d3ee3677e9a3..fc12852ac6b7 100644
--- a/fuse/decompress.c
+++ b/fuse/decompress.c
@@ -33,8 +33,8 @@ static int z_erofs_decompress_generic(struct z_erofs_decompress_req *rq)
 			return -EIO;
 	}
 
-	if (rq->ofs_head) {
-		buff = malloc(rq->outputsize);
+	if (rq->decodedskip) {
+		buff = malloc(rq->decodedlength);
 		if (!buff)
 			return -ENOMEM;
 		dest = buff;
@@ -42,22 +42,21 @@ static int z_erofs_decompress_generic(struct z_erofs_decompress_req *rq)
 
 	if (rq->partial_decoding || !support_0padding)
 		ret = LZ4_decompress_safe_partial(src + inputmargin, dest,
-						  rq->inputsize - inputmargin,
-						  rq->outputsize, rq->outputsize);
+				rq->inputsize - inputmargin,
+				rq->decodedlength, rq->decodedlength);
 	else
 		ret = LZ4_decompress_safe(src + inputmargin, dest,
 					  rq->inputsize - inputmargin,
-					  rq->outputsize);
+					  rq->decodedlength);
 
-	if (ret != (int)rq->outputsize) {
+	if (ret != (int)rq->decodedlength) {
 		ret = -EIO;
 		goto out;
 	}
 
-	if (rq->ofs_head) {
-		src = dest + rq->ofs_head;
-		memcpy(rq->out, src, rq->outputsize - rq->ofs_head);
-	}
+	if (rq->decodedskip)
+		memcpy(rq->out, dest + rq->decodedskip,
+		       rq->decodedlength - rq->decodedskip);
 
 out:
 	if (buff)
@@ -72,11 +71,11 @@ int z_erofs_decompress(struct z_erofs_decompress_req *rq)
 		if (rq->inputsize != EROFS_BLKSIZ)
 			return -EFSCORRUPTED;
 
-		DBG_BUGON(rq->outputsize > EROFS_BLKSIZ);
-		DBG_BUGON(rq->outputsize < rq->ofs_head);
+		DBG_BUGON(rq->decodedlength > EROFS_BLKSIZ);
+		DBG_BUGON(rq->decodedlength < rq->decodedskip);
 
-		memcpy(rq->out, rq->in + rq->ofs_head,
-		       rq->outputsize - rq->ofs_head);
+		memcpy(rq->out, rq->in + rq->decodedskip,
+		       rq->decodedlength - rq->decodedskip);
 		return 0;
 	}
 
diff --git a/fuse/decompress.h b/fuse/decompress.h
index 5a3e2356dc1b..7d436f18da86 100644
--- a/fuse/decompress.h
+++ b/fuse/decompress.h
@@ -17,8 +17,12 @@ enum {
 struct z_erofs_decompress_req {
 	char *in, *out;
 
-	size_t ofs_head;
-	unsigned int inputsize, outputsize;
+	/*
+	 * initial decompressed bytes that need to be skipped
+	 * when finally copying to output buffer
+	 */
+	unsigned int decodedskip;
+	unsigned int inputsize, decodedlength;
 
 	/* indicate the algorithm will be used for decompression */
 	unsigned int alg;
diff --git a/fuse/read.c b/fuse/read.c
index 06ca08587e7c..46be5cc64a90 100644
--- a/fuse/read.c
+++ b/fuse/read.c
@@ -136,9 +136,9 @@ size_t erofs_read_data_compression(struct erofs_vnode *vnode, char *buffer,
 		ret = z_erofs_decompress(&(struct z_erofs_decompress_req) {
 					.in = raw,
 					.out = buffer + sum,
-					.ofs_head = ofs,
+					.decodedskip = ofs,
 					.inputsize = EROFS_BLKSIZ,
-					.outputsize = count,
+					.decodedlength = count,
 					.alg = algorithmformat,
 					.partial_decoding = partial
 					 });
-- 
2.24.0