vcs-svn: read instructions from deltas

Buffer the instruction section upon encountering it for later
interpretation.

An alternative design would involve parsing the instructions
at this point and buffering them in some processed form.  Using
the unprocessed form is simpler.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Acked-by: Ramkumar Ramachandra <artagnon@gmail.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/vcs-svn/svndiff.c b/vcs-svn/svndiff.c
index 175168f59..8968fdb4e 100644
--- a/vcs-svn/svndiff.c
+++ b/vcs-svn/svndiff.c
@@ -25,13 +25,15 @@
 #define VLI_BITS_PER_DIGIT 7
 
 struct window {
+	struct strbuf instructions;
 	struct strbuf data;
 };
 
-#define WINDOW_INIT	{ STRBUF_INIT }
+#define WINDOW_INIT	{ STRBUF_INIT, STRBUF_INIT }
 
 static void window_release(struct window *ctx)
 {
+	strbuf_release(&ctx->instructions);
 	strbuf_release(&ctx->data);
 }
 
@@ -124,7 +126,8 @@ static int apply_one_window(struct line_buffer *delta, off_t *delta_len)
 	/* "source view" offset and length already handled; */
 	if (read_length(delta, &out_len, delta_len) ||
 	    read_length(delta, &instructions_len, delta_len) ||
-	    read_length(delta, &data_len, delta_len))
+	    read_length(delta, &data_len, delta_len) ||
+	    read_chunk(delta, delta_len, &ctx.instructions, instructions_len))
 		goto error_out;
 	if (instructions_len) {
 		error("What do you think I am?  A delta applier?");