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-rw-r--r--vcs-svn/svndiff.c52
-rw-r--r--vcs-svn/svndiff.h10
2 files changed, 62 insertions, 0 deletions
diff --git a/vcs-svn/svndiff.c b/vcs-svn/svndiff.c
new file mode 100644
index 0000000..5916036
--- /dev/null
+++ b/vcs-svn/svndiff.c
@@ -0,0 +1,52 @@
+/*
+ * Licensed under a two-clause BSD-style license.
+ * See LICENSE for details.
+ */
+
+#include "git-compat-util.h"
+#include "line_buffer.h"
+#include "svndiff.h"
+
+/*
+ * svndiff0 applier
+ *
+ * See http://svn.apache.org/repos/asf/subversion/trunk/notes/svndiff.
+ *
+ * svndiff0 ::= 'SVN\0' window*
+ */
+
+static int error_short_read(struct line_buffer *input)
+{
+ if (buffer_ferror(input))
+ return error("error reading delta: %s", strerror(errno));
+ return error("invalid delta: unexpected end of file");
+}
+
+static int read_magic(struct line_buffer *in, off_t *len)
+{
+ static const char magic[] = {'S', 'V', 'N', '\0'};
+ struct strbuf sb = STRBUF_INIT;
+
+ if (*len < sizeof(magic) ||
+ buffer_read_binary(in, &sb, sizeof(magic)) != sizeof(magic))
+ return error_short_read(in);
+
+ if (memcmp(sb.buf, magic, sizeof(magic)))
+ return error("invalid delta: unrecognized file type");
+
+ *len -= sizeof(magic);
+ strbuf_release(&sb);
+ return 0;
+}
+
+int svndiff0_apply(struct line_buffer *delta, off_t delta_len,
+ struct sliding_view *preimage, FILE *postimage)
+{
+ assert(delta && preimage && postimage);
+
+ if (read_magic(delta, &delta_len))
+ return -1;
+ if (delta_len)
+ return error("What do you think I am? A delta applier?");
+ return 0;
+}
diff --git a/vcs-svn/svndiff.h b/vcs-svn/svndiff.h
new file mode 100644
index 0000000..74eb464
--- /dev/null
+++ b/vcs-svn/svndiff.h
@@ -0,0 +1,10 @@
+#ifndef SVNDIFF_H_
+#define SVNDIFF_H_
+
+struct line_buffer;
+struct sliding_view;
+
+extern int svndiff0_apply(struct line_buffer *delta, off_t delta_len,
+ struct sliding_view *preimage, FILE *postimage);
+
+#endif