vcs-svn: let deltas use data from postimage

The copyfrom_target instruction copies appends data that is already
present in the current output view to the end of output.  (The offset
argument is relative to the beginning of output produced in the
current window.)

The region copied is allowed to run past the end of the existing
output.  To support that case, copy one character at a time rather
than calling memcpy or memmove.  This allows copyfrom_target to be
used once to repeat a string many times.  For example:

	COPYFROM_DATA 2
	COPYFROM_OUTPUT 10, 0
	DATA "ab"

would produce the output "ababababababababababab".

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

1 files changed, 26 insertions, 2 deletions

diff --git a/vcs-svn/svndiff.c b/vcs-svn/svndiff.c
index fb7dc22f9..a02eee041 100644
--- a/vcs-svn/svndiff.c
+++ b/vcs-svn/svndiff.c
@@ -21,7 +21,12 @@
  *   | packed_view_selector int
  *   | packed_copyfrom_data
  *   ;
+ * view_selector ::= copyfrom_source
+ *   | copyfrom_target
+ *   ;
+ * copyfrom_target ::= # binary 01 000000;
  * copyfrom_data ::= # binary 10 000000;
+ * packed_view_selector ::= # view_selector OR-ed with 6 bit value;
  * packed_copyfrom_data ::= # copyfrom_data OR-ed with 6 bit value;
  * int ::= highdigit* lowdigit;
  * highdigit ::= # binary 1000 0000 OR-ed with 7 bit value;
@@ -29,6 +34,7 @@
  */
 
 #define INSN_MASK	0xc0
+#define INSN_COPYFROM_TARGET	0x40
 #define INSN_COPYFROM_DATA	0x80
 #define OPERAND_MASK	0x3f
 
@@ -155,6 +161,19 @@ static int read_length(struct line_buffer *in, size_t *result, off_t *len)
 	return 0;
 }
 
+static int copyfrom_target(struct window *ctx, const char **instructions,
+			   size_t nbytes, const char *instructions_end)
+{
+	size_t offset;
+	if (parse_int(instructions, &offset, instructions_end))
+		return -1;
+	if (offset >= ctx->out.len)
+		return error("invalid delta: copies from the future");
+	for (; nbytes > 0; nbytes--)
+		strbuf_addch(&ctx->out, ctx->out.buf[offset++]);
+	return 0;
+}
+
 static int copyfrom_data(struct window *ctx, size_t *data_pos, size_t nbytes)
 {
 	const size_t pos = *data_pos;
@@ -189,9 +208,14 @@ static int execute_one_instruction(struct window *ctx,
 	instruction = (unsigned char) **instructions;
 	if (parse_first_operand(instructions, &nbytes, insns_end))
 		return -1;
-	if ((instruction & INSN_MASK) != INSN_COPYFROM_DATA)
+	switch (instruction & INSN_MASK) {
+	case INSN_COPYFROM_TARGET:
+		return copyfrom_target(ctx, instructions, nbytes, insns_end);
+	case INSN_COPYFROM_DATA:
+		return copyfrom_data(ctx, data_pos, nbytes);
+	default:
 		return error("Unknown instruction %x", instruction);
-	return copyfrom_data(ctx, data_pos, nbytes);
+	}
 }
 
 static int apply_window_in_core(struct window *ctx)