libpayload: Add larfptr function

Add a function to get a pointer to the start of a LAR entry.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Acked-by: Myles Watson <mylesgw@gmail.com>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3337 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

2 files changed, 11 insertions, 0 deletions

diff --git a/payloads/libpayload/include/libpayload.h b/payloads/libpayload/include/libpayload.h
index be4d2a7ba3..8535bd04fa 100644
--- a/payloads/libpayload/include/libpayload.h
+++ b/payloads/libpayload/include/libpayload.h
@@ -247,6 +247,7 @@ int closelar(struct LAR *lar);
 struct larent *readlar(struct LAR *lar);
 void rewindlar(struct LAR *lar);
 int larstat(struct LAR *lar, const char *path, struct larstat *buf);
+void *larfptr(struct LAR *lar, const char *filename);
 struct LFILE * lfopen(struct LAR *lar, const char *filename);
 int lfread(void *ptr, size_t size, size_t nmemb, struct LFILE *stream);
 
diff --git a/payloads/libpayload/libc/lar.c b/payloads/libpayload/libc/lar.c
index 65b503d1c8..6ae4052039 100644
--- a/payloads/libpayload/libc/lar.c
+++ b/payloads/libpayload/libc/lar.c
@@ -218,6 +218,16 @@ int larstat(struct LAR *lar, const char *path, struct larstat *buf)
 	return 0;
 }
 
+void * larfptr(struct LAR *lar, const char *filename)
+{
+	struct lar_header *header = get_header_by_name(lar, filename);
+
+	if (header == NULL)
+		return NULL;
+
+	return (void *) ((u8 *) header + ntohl(header->offset));
+}
+
 struct LFILE * lfopen(struct LAR *lar, const char *filename)
 {
 	struct LFILE *file;