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-rw-r--r--vcs-svn/svndiff.c28
1 files changed, 26 insertions, 2 deletions
diff --git a/vcs-svn/svndiff.c b/vcs-svn/svndiff.c
index fb7dc22..a02eee0 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)