From ffb0cdc4263c5c5f4b13fd7514533f4d17fa2a3b Mon Sep 17 00:00:00 2001
From: Jens Arnold <amiconn@rockbox.org>
Date: Mon, 16 Jan 2006 18:51:12 +0000
Subject: Archos recorders: The Rockboy overlay loader now uses the same header
 as the plugin loader.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8354 a1c6a512-1295-4272-9138-f99709370657
---
 apps/plugins/rockboy.c          | 63 +++++++++++++++++++++++++----------------
 apps/plugins/rockboy/archos.lds |  4 +--
 apps/plugins/rockboy/rockboy.c  | 24 ++--------------
 3 files changed, 44 insertions(+), 47 deletions(-)

diff --git a/apps/plugins/rockboy.c b/apps/plugins/rockboy.c
index d3504572cf..f571894717 100644
--- a/apps/plugins/rockboy.c
+++ b/apps/plugins/rockboy.c
@@ -34,47 +34,62 @@ int audiobuf_size;
 /* this is the plugin entry point */
 enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
 {
-    int fh, readsize;
-    struct {
-        unsigned long magic;
-        unsigned char *start_addr;
-        unsigned char *end_addr;
-        enum plugin_status(*entry_point)(struct plugin_api*, void*);
-    } header;
+    int fd, readsize;
+    struct plugin_header header;
 
     rb = api;
 
-    fh = rb->open(OVL_NAME, O_RDONLY);
-    if (fh < 0)
+    fd = rb->open(OVL_NAME, O_RDONLY);
+    if (fd < 0)
     {
-        rb->splash(2*HZ, true, "Couldn't open " OVL_DISPLAYNAME " overlay.");
+        rb->splash(2*HZ, true, "Can't open " OVL_NAME);
         return PLUGIN_ERROR;
     }
-    readsize = rb->read(fh, &header, sizeof(header));
-    if (readsize != sizeof(header) || header.magic != 0x524f564c)
+    readsize = rb->read(fd, &header, sizeof(header));
+    rb->close(fd);
+    /* Close for now. Less code than doing it in all error checks.
+     * Would need to seek back anyway. */
+
+    if (readsize != sizeof(header))
     {
-        rb->close(fh);
-        rb->splash(2*HZ, true, OVL_NAME " is not a valid Rockbox overlay.");
+        rb->splash(2*HZ, true, "Reading" OVL_DISPLAYNAME " overlay failed.");
         return PLUGIN_ERROR;
     }
-    
+    if (header.magic != PLUGIN_MAGIC || header.target_id != TARGET_ID)
+    {
+        rb->splash(2*HZ, true, OVL_DISPLAYNAME 
+                               " overlay: Incompatible model.");
+        return PLUGIN_ERROR;
+    }
+    if (header.api_version != PLUGIN_API_VERSION) 
+    {
+        rb->splash(2*HZ, true, OVL_DISPLAYNAME
+                               " overlay: Incompatible version.");
+        return PLUGIN_ERROR;
+    }
+
     audiobuf = rb->plugin_get_audio_buffer(&audiobuf_size);
-    if (header.start_addr < audiobuf ||
+    if (header.load_addr < audiobuf ||
         header.end_addr > audiobuf + audiobuf_size)
     {
-        rb->close(fh);
         rb->splash(2*HZ, true, OVL_DISPLAYNAME 
-                   " overlay doesn't fit into memory.");
+                               " overlay doesn't fit into memory.");
+        return PLUGIN_ERROR;
+    }
+    rb->memset(header.load_addr, 0, header.end_addr - header.load_addr);
+
+    fd = rb->open(OVL_NAME, O_RDONLY);
+    if (fd < 0)
+    {
+        rb->splash(2*HZ, true, "Can't open " OVL_NAME);
         return PLUGIN_ERROR;
     }
-    rb->memset(header.start_addr, 0, header.end_addr - header.start_addr);
+    readsize = rb->read(fd, header.load_addr, header.end_addr - header.load_addr);
+    rb->close(fd);
 
-    rb->lseek(fh, 0, SEEK_SET);
-    readsize = rb->read(fh, header.start_addr, header.end_addr - header.start_addr);
-    rb->close(fh);
-    if (readsize <= (int)sizeof(header))
+    if (readsize < 0)
     {
-        rb->splash(2*HZ, true, "Error loading " OVL_DISPLAYNAME " overlay.");
+        rb->splash(2*HZ, true, "Reading" OVL_DISPLAYNAME " overlay failed.");
         return PLUGIN_ERROR;
     }
     return header.entry_point(api, parameter);
diff --git a/apps/plugins/rockboy/archos.lds b/apps/plugins/rockboy/archos.lds
index 55db1e2e30..24f4f1d4eb 100755
--- a/apps/plugins/rockboy/archos.lds
+++ b/apps/plugins/rockboy/archos.lds
@@ -19,7 +19,7 @@ MEMORY
 SECTIONS
 {
     .header : {
-        _ovl_start_addr = .;
+        _plugin_start_addr = .;
         *(.header)
     } > OVERLAY_RAM
 
@@ -42,6 +42,6 @@ SECTIONS
         *(.bss)
         *(COMMON)
         . = ALIGN(0x4);
-        _ovl_end_addr = .;
+        _plugin_end_addr = .;
     } > OVERLAY_RAM
 }
diff --git a/apps/plugins/rockboy/rockboy.c b/apps/plugins/rockboy/rockboy.c
index a21e9e4368..a7e9bfb8f1 100644
--- a/apps/plugins/rockboy/rockboy.c
+++ b/apps/plugins/rockboy/rockboy.c
@@ -20,25 +20,7 @@
 #include "loader.h"
 #include "rockmacros.h"
 
-#if MEM <= 8 && !defined(SIMULATOR)
-/* On archos this is loaded as an overlay */
-
-/* These are defined in the linker script */
-extern unsigned char ovl_start_addr[];
-extern unsigned char ovl_end_addr[];
-
-const struct {
-    unsigned long magic;
-    unsigned char *start_addr;
-    unsigned char *end_addr;
-    enum plugin_status (*entry_point)(struct plugin_api*, void*);
-} header __attribute__ ((section (".header"))) = {
-    0x524f564c, /* ROVL */
-    ovl_start_addr, ovl_end_addr, plugin_start
-};
-#else
 PLUGIN_HEADER
-#endif
 
 #ifdef USE_IRAM
 extern char iramcopy[];
@@ -109,10 +91,10 @@ enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
     audio_bufferbase = audio_bufferpointer
         = rb->plugin_get_audio_buffer((int *)&audio_buffer_free);
 #if MEM <= 8 && !defined(SIMULATOR)
-    /* loaded as an overlay, protect from overwriting ourselves */
-    if ((unsigned)(ovl_start_addr - (unsigned char *)audio_bufferbase)
+    /* loaded as an overlay plugin, protect from overwriting ourselves */
+    if ((unsigned)(plugin_start_addr - (unsigned char *)audio_bufferbase)
         < audio_buffer_free)
-        audio_buffer_free = ovl_start_addr - (unsigned char *)audio_bufferbase;
+        audio_buffer_free = plugin_start_addr - (unsigned char *)audio_bufferbase;
 #endif
 
 #ifdef USE_IRAM
-- 
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