From f51e0f62e514851e73e1879d9cbe78fb6bfdd988 Mon Sep 17 00:00:00 2001
From: twinaphex <libretro@gmail.com>
Date: Thu, 7 Apr 2016 02:21:43 +0200
Subject: [PATCH] Add intfstream_seek

---
 .../include/streams/interface_stream.h        |  3 +++
 libretro-common/streams/interface_stream.c    | 25 ++++++++++++++++---
 libretro-common/streams/memory_stream.c       |  3 ++-
 3 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/libretro-common/include/streams/interface_stream.h b/libretro-common/include/streams/interface_stream.h
index 291fb43f75..f2518a3f15 100644
--- a/libretro-common/include/streams/interface_stream.h
+++ b/libretro-common/include/streams/interface_stream.h
@@ -67,4 +67,7 @@ char *intfstream_gets(intfstream_internal_t *intf,
 
 int intfstream_getc(intfstream_internal_t *intf);
 
+int intfstream_seek(intfstream_internal_t *intf,
+      int offset, int whence);
+
 #endif
diff --git a/libretro-common/streams/interface_stream.c b/libretro-common/streams/interface_stream.c
index ac397273df..21621af9eb 100644
--- a/libretro-common/streams/interface_stream.c
+++ b/libretro-common/streams/interface_stream.c
@@ -67,7 +67,8 @@ bool intfstream_resize(intfstream_internal_t *intf, intfstream_info_t *info)
    return true;
 }
 
-bool intfstream_open(intfstream_internal_t *intf, const char *path, unsigned mode, ssize_t len)
+bool intfstream_open(intfstream_internal_t *intf, const char *path,
+      unsigned mode, ssize_t len)
 {
    if (!intf)
       return false;
@@ -120,6 +121,22 @@ error:
    return NULL;
 }
 
+int intfstream_seek(intfstream_internal_t *intf, int offset, int whence)
+{
+   if (!intf)
+      return -1;
+
+   switch (intf->type)
+   {
+      case INTFSTREAM_FILE:
+         return filestream_seek(intf->file.fp, offset, whence);
+      case INTFSTREAM_MEMORY:
+         return memstream_seek(intf->memory.fp, offset, whence);
+   }
+
+   return -1;
+}
+
 ssize_t intfstream_read(intfstream_internal_t *intf, void *s, size_t len)
 {
    if (!intf)
@@ -136,7 +153,8 @@ ssize_t intfstream_read(intfstream_internal_t *intf, void *s, size_t len)
    return 0;
 }
 
-ssize_t intfstream_write(intfstream_internal_t *intf, const void *s, size_t len)
+ssize_t intfstream_write(intfstream_internal_t *intf,
+      const void *s, size_t len)
 {
    if (!intf)
       return 0;
@@ -152,7 +170,8 @@ ssize_t intfstream_write(intfstream_internal_t *intf, const void *s, size_t len)
    return 0;
 }
 
-char *intfstream_gets(intfstream_internal_t *intf, char *buffer, size_t len)
+char *intfstream_gets(intfstream_internal_t *intf,
+      char *buffer, size_t len)
 {
    if (!intf)
       return NULL;
diff --git a/libretro-common/streams/memory_stream.c b/libretro-common/streams/memory_stream.c
index 8bcf9958b3..396f388d0f 100644
--- a/libretro-common/streams/memory_stream.c
+++ b/libretro-common/streams/memory_stream.c
@@ -48,7 +48,8 @@ size_t memstream_get_last_size(void)
    return last_file_size;
 }
 
-static void memstream_init(memstream_t *stream, uint8_t *buffer, size_t max_size)
+static void memstream_init(memstream_t *stream,
+      uint8_t *buffer, size_t max_size)
 {
    if (!stream)
       return;