[CRYPTO] scatterwalk: Add scatterwalk_map_and_copy

This patch adds the function scatterwalk_map_and_copy which reads or writes a chunk of data from a scatterlist at a given offset. It will be used by authenc which would read/write the authentication data at the end of the cipher/plain text. Signed-off-by: Herbert Xu <[email protected]>
chewitt · Oct 10, 2007 · 5fa0fea · 5fa0fea
1 parent e962a65
commit 5fa0fea
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diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c
@@ -107,3 +107,25 @@ void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
 	}
 }
 EXPORT_SYMBOL_GPL(scatterwalk_copychunks);
+
+void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
+			      unsigned int start, unsigned int nbytes, int out)
+{
+	struct scatter_walk walk;
+	unsigned int offset = 0;
+
+	for (;;) {
+		scatterwalk_start(&walk, sg);
+
+		if (start < offset + sg->length)
+			break;
+
+		offset += sg->length;
+		sg = sg_next(sg);
+	}
+
+	scatterwalk_advance(&walk, start - offset);
+	scatterwalk_copychunks(buf, &walk, nbytes, out);
+	scatterwalk_done(&walk, out, 0);
+}
+EXPORT_SYMBOL_GPL(scatterwalk_map_and_copy);
diff --git a/crypto/scatterwalk.h b/crypto/scatterwalk.h
@@ -74,4 +74,7 @@ void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
 void *scatterwalk_map(struct scatter_walk *walk, int out);
 void scatterwalk_done(struct scatter_walk *walk, int out, int more);
 
+void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
+			      unsigned int start, unsigned int nbytes, int out);
+
 #endif  /* _CRYPTO_SCATTERWALK_H */