Compress the .data section as well (saves another 4KBytes and comes for free)

[proxmark3-svn] / armsrc / start.c

diff --git a/armsrc/start.c b/armsrc/start.c
index d7332bda5682255bb03e4d306e87763d97218a51..f1e58ab0ed9359e80714c4be2fd146494b9fa4d4 100644 (file)
--- a/armsrc/start.c
+++ b/armsrc/start.c
@@ -11,23 +11,75 @@
 
 #include "proxmark3.h"
 #include "apps.h"
+#include "zlib.h"
+#include "BigBuf.h"
+
+static uint8_t *next_free_memory;
+extern struct common_area common_area;
+extern char __data_src_start__, __data_start__, __data_end__, __bss_start__, __bss_end__;
+
+
+static voidpf inflate_malloc(voidpf opaque, uInt items, uInt size)
+{
+       uint8_t *allocated_memory;
+       
+       allocated_memory = next_free_memory;
+       next_free_memory += items*size;
+       return allocated_memory;
+}
+
+
+static void inflate_free(voidpf opaque, voidpf address)
+{
+       // nothing to do
+       
+}
+
+static void uncompress_data_section(void)
+{
+       z_stream data_section;
+
+       next_free_memory = BigBuf_get_addr();
+       
+       // initialize zstream structure
+       data_section.next_in = (uint8_t *) &__data_src_start__;
+       data_section.avail_in = &__data_end__ - &__data_start__;  // uncompressed size. Wrong but doesn't matter.
+       data_section.next_out = (uint8_t *) &__data_start__;
+       data_section.avail_out = &__data_end__ - &__data_start__;  // uncompressed size. Correct.
+       data_section.zalloc = &inflate_malloc;
+       data_section.zfree = &inflate_free;
+       data_section.opaque = NULL;
+
+       // initialize zlib for inflate
+       inflateInit2(&data_section, 15);
+
+       // uncompress data segment to RAM
+       inflate(&data_section, Z_FINISH);
+       
+       // save the size of the compressed data section
+       common_area.arg1 = data_section.total_in;
+}
+
 
-extern char __data_start__, __data_src_start__,  __data_end__, __bss_start__, __bss_end__;
 void __attribute__((section(".startos"))) Vector(void)
 {
        /* Stack should have been set up by the bootloader */
-       char *src, *dst, *end;
+       // char *src;
+       char *dst, *end;
+       
+       uncompress_data_section();
 
        /* Set up (that is: clear) BSS. */
        dst = &__bss_start__;
        end = &__bss_end__;
        while(dst < end) *dst++ = 0;
 
-       /* Set up data segment: Copy from flash to ram */
-       src = &__data_src_start__;
-       dst = &__data_start__;
-       end = &__data_end__;
-       while(dst < end) *dst++ = *src++;
+       // Set up data segment: Copy from flash to ram
+       // src = &__data_src_start__;
+       // dst = &__data_start__;
+       // end = &__data_end__;
+       // while(dst < end) *dst++ = *src++;
+
 
        AppMain();
 }