Add an xdr function for the cbfs_file header

And use it in fit.c and remove one more use of htonl.

Change-Id: Ibf18dcc0a7f08d75c2374115de0db7a4bf64ec1e
Signed-off-by: Ronald G. Minnich <rminnich@google.com>
Reviewed-on: http://review.coreboot.org/5120
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

util/cbfstool/cbfs.h

@@ -126,6 +126,9 @@ uint32_t get_cbfs_entry_type(const char *name, uint32_t default_value);
 const char *get_cbfs_entry_type_name(uint32_t type);
 uint32_t get_cbfs_compression(const char *name, uint32_t unknown);
 
+/* common.c */
+void cbfs_file_get_header(struct buffer *buf, struct cbfs_file *file);
+
 /* elfheaders.c */
 int
 elf_headers(const struct buffer *pinput,

util/cbfstool/common.c

@@ -103,6 +103,15 @@ void buffer_delete(struct buffer *buffer) {
 	buffer->size = 0;
 }
 
+void cbfs_file_get_header(struct buffer *buf, struct cbfs_file *file)
+{
+	bgets(buf, &file->magic, sizeof(file->magic));
+	file->len = xdr_be.get32(buf);
+	file->type = xdr_be.get32(buf);
+	file->checksum = xdr_be.get32(buf);
+	file->offset = xdr_be.get32(buf);
+}
+
 static struct {
 	uint32_t arch;
 	const char *name;

util/cbfstool/common.h

@@ -110,5 +110,6 @@ struct xdr {
 
 /* xdr.c */
 extern struct xdr xdr_le, xdr_be;
+int bgets(struct buffer *input, void *output, size_t len);
 
 #endif

util/cbfstool/fit.c

@@ -188,17 +188,28 @@ static void add_microcodde_entries(struct cbfs_image *image,
 	}
 }
 
+static int fit_header(void *ptr, uint32_t *current_offset, uint32_t *file_length)
+{
+	struct buffer buf;
+	struct cbfs_file header;
+	buf.data = ptr;
+	buf.size = sizeof(header);
+	cbfs_file_get_header(&buf, &header);
+	*current_offset = header.offset;
+	*file_length = header.len;
+	return 0;
+}
+
 static int parse_microcode_blob(struct cbfs_image *image,
                                 struct cbfs_file *mcode_file,
                                 struct microcode_entry *mcus, int *total_mcus)
 {
 	int num_mcus;
-	int current_offset;
+	uint32_t current_offset;
-	int file_length;
+	uint32_t file_length;
 
 	current_offset = (int)((char *)mcode_file - image->buffer.data);
-	current_offset += ntohl(mcode_file->offset);
+	fit_header(mcode_file, &current_offset, &file_length);
-	file_length = ntohl(mcode_file->len);
 
 	num_mcus = 0;
 	while (file_length > sizeof(struct microcode_header))

util/cbfstool/xdr.c

@@ -25,6 +25,15 @@
 #include <stdint.h>
 #include "common.h"
 
+int bgets(struct buffer *input, void *output, size_t len)
+{
+	len = input->size < len ? input->size : len;
+	memmove(output, input->data, len);
+	input->data += len;
+	input->size -= len;
+	return len;
+}
+
 /* The assumption in all this code is that we're given a pointer to enough data.
  * Hence, we do not check for underflow.
  */