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-rw-r--r--merge-blobs.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/merge-blobs.c b/merge-blobs.c
new file mode 100644
index 0000000000..9b6eac22e4
--- /dev/null
+++ b/merge-blobs.c
@@ -0,0 +1,92 @@
+#include "cache.h"
+#include "run-command.h"
+#include "xdiff-interface.h"
+#include "ll-merge.h"
+#include "blob.h"
+#include "merge-blobs.h"
+
+static int fill_mmfile_blob(mmfile_t *f, struct blob *obj)
+{
+ void *buf;
+ unsigned long size;
+ enum object_type type;
+
+ buf = read_sha1_file(obj->object.oid.hash, &type, &size);
+ if (!buf)
+ return -1;
+ if (type != OBJ_BLOB) {
+ free(buf);
+ return -1;
+ }
+ f->ptr = buf;
+ f->size = size;
+ return 0;
+}
+
+static void free_mmfile(mmfile_t *f)
+{
+ free(f->ptr);
+}
+
+static void *three_way_filemerge(const char *path, mmfile_t *base, mmfile_t *our, mmfile_t *their, unsigned long *size)
+{
+ int merge_status;
+ mmbuffer_t res;
+
+ /*
+ * This function is only used by cmd_merge_tree, which
+ * does not respect the merge.conflictstyle option.
+ * There is no need to worry about a label for the
+ * common ancestor.
+ */
+ merge_status = ll_merge(&res, path, base, NULL,
+ our, ".our", their, ".their", NULL);
+ if (merge_status < 0)
+ return NULL;
+
+ *size = res.size;
+ return res.ptr;
+}
+
+void *merge_blobs(const char *path, struct blob *base, struct blob *our, struct blob *their, unsigned long *size)
+{
+ void *res = NULL;
+ mmfile_t f1, f2, common;
+
+ /*
+ * Removed in either branch?
+ *
+ * NOTE! This depends on the caller having done the
+ * proper warning about removing a file that got
+ * modified in the other branch!
+ */
+ if (!our || !their) {
+ enum object_type type;
+ if (base)
+ return NULL;
+ if (!our)
+ our = their;
+ return read_sha1_file(our->object.oid.hash, &type, size);
+ }
+
+ if (fill_mmfile_blob(&f1, our) < 0)
+ goto out_no_mmfile;
+ if (fill_mmfile_blob(&f2, their) < 0)
+ goto out_free_f1;
+
+ if (base) {
+ if (fill_mmfile_blob(&common, base) < 0)
+ goto out_free_f2_f1;
+ } else {
+ common.ptr = xstrdup("");
+ common.size = 0;
+ }
+ res = three_way_filemerge(path, &common, &f1, &f2, size);
+ free_mmfile(&common);
+out_free_f2_f1:
+ free_mmfile(&f2);
+out_free_f1:
+ free_mmfile(&f1);
+out_no_mmfile:
+ return res;
+}