[PATCH v2 03/10] cat-file: use streaming interface to print blobs

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin/cat-file.c |   23 +++++++++++++++++++++++
 t/t1050-large.sh   |    2 +-
 2 files changed, 24 insertions(+), 1 deletions(-)

diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index 8ed501f..bc6cc9f 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -11,6 +11,7 @@
 #include "parse-options.h"
 #include "diff.h"
 #include "userdiff.h"
+#include "streaming.h"
 
 #define BATCH 1
 #define BATCH_CHECK 2
@@ -82,6 +83,24 @@ static void pprint_tag(const unsigned char *sha1, const char *buf, unsigned long
 		write_or_die(1, cp, endp - cp);
 }
 
+static int write_blob(const unsigned char *sha1)
+{
+	unsigned char new_sha1[20];
+
+	if (sha1_object_info(sha1, NULL) == OBJ_TAG) {
+		enum object_type type;
+		unsigned long size;
+		char *buffer = read_sha1_file(sha1, &type, &size);
+		if (memcmp(buffer, "object ", 7) ||
+		    get_sha1_hex(buffer + 7, new_sha1))
+			die("%s not a valid tag", sha1_to_hex(sha1));
+		sha1 = new_sha1;
+		free(buffer);
+	}
+
+	return stream_blob_to_fd(1, sha1, NULL, 0);
+}
+
 static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
 {
 	unsigned char sha1[20];
@@ -127,6 +146,8 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
 			return cmd_ls_tree(2, ls_args, NULL);
 		}
 
+		if (type == OBJ_BLOB)
+			return write_blob(sha1);
 		buf = read_sha1_file(sha1, &type, &size);
 		if (!buf)
 			die("Cannot read object %s", obj_name);
@@ -149,6 +170,8 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
 		break;
 
 	case 0:
+		if (type_from_string(exp_type) == OBJ_BLOB)
+			return write_blob(sha1);
 		buf = read_object_with_reference(sha1, exp_type, &size, NULL);
 		break;
 
diff --git a/t/t1050-large.sh b/t/t1050-large.sh
index f245e59..39a3e77 100755
--- a/t/t1050-large.sh
+++ b/t/t1050-large.sh
@@ -114,7 +114,7 @@ test_expect_success 'hash-object' '
 	git hash-object large1
 '
 
-test_expect_failure 'cat-file a large file' '
+test_expect_success 'cat-file a large file' '
 	git cat-file blob :large1 >/dev/null
 '
 
-- 
1.7.8.36.g69ee2