kernel/res + base: Add `get_resource` and an icons.res file

Makefile

@@ -67,8 +67,19 @@ bootloader/bootloader.bin: bootloader/main.asm $(wildcard bootloader/*.asm)
 base_image/startup.cfg: base_image/startup.cfg.default
 	cp $< $@
 
+ICONS := \
+	applications/icons/cfg_icon.inc \
+	applications/icons/dsk_icon.inc \
+	applications/icons/fxf_icon.inc
+
+applications/icons/%.inc: applications/icons/%.png
+	$(GFX2INC) 32 32 $< $@
+base_image/icons.res: applications/icons/icons.res.asm $(ICONS)
+	$(FOX32ASM) $< $@
+
 FILES = \
 	base_image/startup.cfg \
+	base_image/icons.res \
 	base_image/kernel.fxf \
 	base_image/sh.fxf \
 	base_image/barclock.fxf \
@@ -83,6 +94,7 @@ FILES = \
 
 ROM_FILES = \
 	base_image/startup.cfg \
+	base_image/icons.res \
 	base_image/kernel.fxf \
 	base_image/sh.fxf \
 	base_image/barclock.fxf \

applications/icons/.gitignore

@@ -0,0 +1 @@
+*.inc

applications/icons/icons.res.asm

@@ -0,0 +1,16 @@
+const ICON_SIZE: 4096
+
+    ; format: "RES" magic bytes, version, number of resource IDs
+    data.str "RES" data.8 0 data.8 3
+
+    ; format: 3 character null-terminated ID, pointer to data, size
+    data.strz "cfg" data.32 cfg_icon data.32 ICON_SIZE
+    data.strz "dsk" data.32 dsk_icon data.32 ICON_SIZE
+    data.strz "fxf" data.32 fxf_icon data.32 ICON_SIZE
+
+cfg_icon:
+    #include "cfg_icon.inc"
+dsk_icon:
+    #include "dsk_icon.inc"
+fxf_icon:
+    #include "fxf_icon.inc"

fox32os.def

@@ -52,6 +52,9 @@ get_size:                  jmp [0x00000D24]
 draw_widgets_to_window:    jmp [0x00000E10]
 handle_widget_click:       jmp [0x00000E14]
 
+; resource jump table
+get_resource:              jmp [0x00000F10]
+
 ; event types
 const EVENT_TYPE_BUTTON_CLICK: 0x80000000
 

kernel/main.asm

@@ -77,6 +77,10 @@ jump_table:
     org.pad 0x00000610
     data.32 draw_widgets_to_window
     data.32 handle_widget_click
+
+    ; resource jump table
+    org.pad 0x00000710
+    data.32 get_resource
 jump_table_end:
 
     ; initialization code
@@ -374,6 +378,7 @@ get_os_api_version:
 
     #include "allocator.asm"
     #include "fxf/fxf.asm"
+    #include "res.asm"
     #include "task.asm"
     #include "vfs/vfs.asm"
     #include "widget/widget.asm"

kernel/res.asm

@@ -0,0 +1,48 @@
+; RES resource routines
+
+; extract resource data from a RES binary loaded in memory
+; inputs:
+; r0: pointer to memory buffer containing a RES binary
+; r1: pointer to 3 character null-terminated resource ID string
+; r2: size of resource data to be extracted
+; outputs:
+; r0: pointer to newly-allocated memory buffer containing the requested resource data
+;     this buffer must be freed by the caller!
+;     returns zero if resource ID not found, not enough memory, or invalid magic bytes
+get_resource:
+    cmp [r0], [res_magic]
+    ifnz mov r0, 0
+    ifnz ret
+
+    push r3
+    push r31
+
+    mov r3, r0
+    movz.8 r31, [r0+4]
+    add r0, 5
+get_resource_find_loop:
+    cmp [r0], [r1]
+    ifz jmp get_resource_found
+    add r0, 12
+    loop get_resource_find_loop
+    mov r0, 0
+    jmp get_resource_end
+get_resource_found:
+    cmp r2, [r0+8]
+    ifgt mov r2, [r0+8]
+    mov r31, [r0+4]
+    add r31, r3
+    mov r0, r2
+    call allocate_memory
+    cmp r0, 0
+    ifz jmp get_resource_end
+    mov r1, r0
+    mov r0, r31
+    call copy_memory_bytes
+    mov r0, r1
+get_resource_end:
+    pop r31
+    pop r3
+    ret
+
+res_magic: data.strz "RES"