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-rw-r--r--Makefile2
-rw-r--r--tag.c73
-rw-r--r--tag.h15
3 files changed, 89 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index 2d2913b6b..b533a2834 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@ all: $(PROG)
install: $(PROG) $(SCRIPTS)
install $(PROG) $(SCRIPTS) $(HOME)/bin/
-LIB_OBJS=read-cache.o sha1_file.o usage.o object.o commit.o tree.o blob.o
+LIB_OBJS=read-cache.o sha1_file.o usage.o object.o commit.o tree.o blob.o tag.o
LIB_FILE=libgit.a
LIB_H=cache.h object.h
diff --git a/tag.c b/tag.c
new file mode 100644
index 000000000..f079d83a9
--- /dev/null
+++ b/tag.c
@@ -0,0 +1,73 @@
+#include "tag.h"
+#include "cache.h"
+
+const char *tag_type = "tag";
+
+struct tag *lookup_tag(unsigned char *sha1)
+{
+ struct object *obj = lookup_object(sha1);
+ if (!obj) {
+ struct tag *ret = xmalloc(sizeof(struct tag));
+ memset(ret, 0, sizeof(struct tag));
+ created_object(sha1, &ret->object);
+ ret->object.type = tag_type;
+ return ret;
+ }
+ if (obj->type != tag_type) {
+ error("Object %s is a %s, not a tree",
+ sha1_to_hex(sha1), obj->type);
+ return NULL;
+ }
+ return (struct tag *) obj;
+}
+
+int parse_tag(struct tag *item)
+{
+ char type[20];
+ void *data, *bufptr;
+ unsigned long size;
+ if (item->object.parsed)
+ return 0;
+ item->object.parsed = 1;
+ data = bufptr = read_sha1_file(item->object.sha1, type, &size);
+ if (!data)
+ return error("Could not read %s",
+ sha1_to_hex(item->object.sha1));
+ if (strcmp(type, tag_type))
+ return error("Object %s not a tag",
+ sha1_to_hex(item->object.sha1));
+
+ int typelen, taglen;
+ unsigned char object[20];
+ const char *type_line, *tag_line, *sig_line;
+
+ if (size < 64)
+ return -1;
+ if (memcmp("object ", data, 7) || get_sha1_hex(data + 7, object))
+ return -1;
+
+ item->tagged = parse_object(object);
+
+ type_line = data + 48;
+ if (memcmp("\ntype ", type_line-1, 6))
+ return -1;
+
+ tag_line = strchr(type_line, '\n');
+ if (!tag_line || memcmp("tag ", ++tag_line, 4))
+ return -1;
+
+ sig_line = strchr(tag_line, '\n');
+ if (!sig_line)
+ return -1;
+ sig_line++;
+
+ typelen = tag_line - type_line - strlen("type \n");
+ if (typelen >= 20)
+ return -1;
+ taglen = sig_line - tag_line - strlen("tag \n");
+ item->tag = xmalloc(taglen + 1);
+ memcpy(item->tag, tag_line + 4, taglen);
+ item->tag[taglen] = '\0';
+
+ return 0;
+}
diff --git a/tag.h b/tag.h
new file mode 100644
index 000000000..7ae7864d8
--- /dev/null
+++ b/tag.h
@@ -0,0 +1,15 @@
+#ifndef TAG_H
+#define TAG_H
+
+#include "object.h"
+
+extern const char *tag_type;
+
+struct tag {
+ struct object object;
+ struct object *tagged;
+ char *tag;
+ char *signature; /* not actually implemented */
+};
+
+#endif /* TAG_H */