centralizing all IO buffer size values

src/blob.c

@@ -74,7 +74,7 @@ static int write_file_stream(
 	git_oid *id, git_odb *odb, const char *path, git_off_t file_size)
 {
 	int fd, error;
-	char buffer[4096];
+	char buffer[FILEIO_BUFSIZE];
 	git_odb_stream *stream = NULL;
 	ssize_t read_len = -1, written = 0;
 

src/common.h

@@ -68,6 +68,11 @@
 
 #include <regex.h>
 
+#define DEFAULT_BUFSIZE 65536
+#define FILEIO_BUFSIZE DEFAULT_BUFSIZE
+#define FILTERIO_BUFSIZE DEFAULT_BUFSIZE
+#define NETIO_BUFSIZE DEFAULT_BUFSIZE
+
 /**
  * Check a pointer allocation result, returning -1 if it failed.
  */

src/filebuf.c

@@ -68,7 +68,7 @@ static int lock_file(git_filebuf *file, int flags, mode_t mode)
 
 	if ((flags & GIT_FILEBUF_APPEND) && git_path_exists(file->path_original) == true) {
 		git_file source;
-		char buffer[2048];
+		char buffer[FILEIO_BUFSIZE];
 		ssize_t read_bytes;
 
 		source = p_open(file->path_original, O_RDONLY);

src/fileops.c

@@ -689,7 +689,7 @@ int git_futils_fake_symlink(const char *old, const char *new)
 static int cp_by_fd(int ifd, int ofd, bool close_fd_when_done)
 {
 	int error = 0;
-	char buffer[4096];
+	char buffer[FILEIO_BUFSIZE];
 	ssize_t len = 0;
 
 	while (!error && (len = p_read(ifd, buffer, sizeof(buffer))) > 0)

src/filter.c

@@ -875,15 +875,13 @@ void stream_list_free(git_vector *streams)
 	git_vector_free(streams);
 }
 
-#define STREAM_BUFSIZE 65536
-
 int git_filter_list_stream_file(
 	git_filter_list *filters,
 	git_repository *repo,
 	const char *path,
 	git_writestream *target)
 {
-	char buf[STREAM_BUFSIZE];
+	char buf[FILTERIO_BUFSIZE];
 	git_buf abspath = GIT_BUF_INIT;
 	const char *base = repo ? git_repository_workdir(repo) : NULL;
 	git_vector filter_streams = GIT_VECTOR_INIT;
@@ -901,7 +899,7 @@ int git_filter_list_stream_file(
 		goto done;
 	}
 
-	while ((readlen = p_read(fd, buf, STREAM_BUFSIZE)) > 0) {
+	while ((readlen = p_read(fd, buf, sizeof(buf))) > 0) {
 		if ((error = stream_start->write(stream_start, buf, readlen)) < 0)
 			goto done;
 	}

src/odb.c

@@ -142,7 +142,7 @@ void git_odb_object_free(git_odb_object *object)
 int git_odb__hashfd(git_oid *out, git_file fd, size_t size, git_otype type)
 {
 	int hdr_len;
-	char hdr[64], buffer[2048];
+	char hdr[64], buffer[FILEIO_BUFSIZE];
 	git_hash_ctx ctx;
 	ssize_t read_len = 0;
 	int error = 0;

src/transports/http.c

@@ -70,7 +70,7 @@ typedef struct {
 	gitno_buffer parse_buffer;
 	git_buf parse_header_name;
 	git_buf parse_header_value;
-	char parse_buffer_data[2048];
+	char parse_buffer_data[NETIO_BUFSIZE];
 	char *content_type;
 	char *location;
 	git_vector www_authenticate;