ESP8266 Community Forum

- Wed May 27, 2015 12:16 pm #18619 Moin,

I think, the signature of the rom base64_encode is the same as this:

http://ftp.netbsd.org/pub/NetBSD/NetBSD ... s/base64.c

Cal

@dnc40085 I can't access github at the moment. Can you put a link to this post?

Get your modules here:

https://www.banggood.com/custlink/KvGGhGF4wG

- Wed May 27, 2015 5:45 pm #18674 No problem, it's done.

- Thu May 28, 2015 12:23 pm #18751 Moin,

background of this post is need for base64 encode method and trying to use the ROM version of this method.

The signature of the rom function "base64_encode" seems to be indeed

Code: Select allextern unsigned char * base64_encode(const unsigned char *src, size_t len, size_t *out_len);

Unfortunately it that seems to require the ROM memory management to be initialized because it uses mem_malloc.

As a brute force POC I added the following to the start of the nodemcu init function:

Code: Select allvoid nodemcu_init(void)
{
   unsigned char * base64;
   unsigned char * somemem;

    NODE_ERR("nodemcu_init\n");

    extern void mem_init(void * start_addr);
    extern unsigned char * base64_encode(const unsigned char *src, size_t len,
                   size_t *out_len);
    // get some mem from nodemcu heap
    somemem = c_malloc(8192);
    // fake rom malloc init
    mem_init(somemem);
    base64 = base64_encode("GPL or BSD?", 11, 0);

    NODE_ERR("base64:");
    NODE_ERR(base64);


This prints:

Code: Select allnodemcu_init
base64:R1BMIG9yIEJTRD8=


Which can be decoded:

Code: Select all$ echo R1BMIG9yIEJTRD8= | base64 -d
GPL or BSD?


mem_init looks cheap so it may be a way to conserve instruction memory here by using base64_encode from ROM.

Can't make my mind if it's too hacky...

Cal

Get your modules here:

https://www.banggood.com/custlink/KvGGhGF4wG

- Thu May 28, 2015 12:23 pm #18752

No problem, it's done.

Thanks!

Get your modules here:

https://www.banggood.com/custlink/KvGGhGF4wG