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/*
* Copyright 2012 Luke Dashjr
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 3 of the License, or (at your option)
* any later version. See COPYING for more details.
*/

#define _BSD_SOURCE
#include <stdint.h>
#include <stdio.h>
#include <string.h>

#include <libgen.h>
#include <arpa/inet.h>

#define BFL_FILE_MAGIC "BFLDATA"
#define BFL_UPLOAD_MAGIC "NGH-STREAM"

#define myassert(expr, n, ...) \
do { \
if (!(expr)) { \
fprintf(stderr, __VA_ARGS__); \
return n; \
} \
} while(0)

#define ERRRESP(buf) buf, (buf[strlen(buf)-1] == '\n' ? "" : "\n")

#define WAITFOROK(n, msg) \
do { \
myassert(fgets(buf, sizeof(buf), BFL), n, "Error reading response from " msg "\n"); \
myassert(!strcmp(buf, "OK\n"), n, "Invalid response from " msg ": %s%s", ERRRESP(buf)); \
} while(0)

int main(int argc, char**argv)
{
myassert(argc == 3, 1, "Usage: %s <serialdev> <firmware.bfl>\n", argv[0]);
setbuf(stdout, NULL);

// Check filename
char *FWname = basename(strdup(argv[2]));
size_t FWnameLen = strlen(FWname);
myassert(FWnameLen <= 255, 0x0f, "Firmware filename '%s' is too long\n", FWname);
uint8_t n8 = FWnameLen;

// Open and check firmware file
FILE *FW = fopen(argv[2], "r");
myassert(FW, 0x10, "Failed to open '%s' for reading\n", argv[2]);
char buf[0x20];
myassert(1 == fread(buf, 7, 1, FW), 0x10, "Failed to read from '%s'\n", argv[2]);
myassert(!memcmp(buf, BFL_FILE_MAGIC, sizeof(BFL_FILE_MAGIC)-1), 0x11, "'%s' doesn't look like a BFL firmware\n", argv[2]);
myassert(!fseek(FW, 0, SEEK_END), 0x12, "Failed to find end of '%s'\n", argv[2]);
long FWlen = ftell(FW);
myassert(FWlen > 0, 0x12, "Couldn't get size of '%s'\n", argv[2]);
myassert(!fseek(FW, 7, SEEK_SET), 0x12, "Failed to rewind firmware file after getting size\n");
FWlen -= 7;
printf("Firmware file looks OK :)\n");

// Open device
FILE *BFL = fopen(argv[1], "r+");
myassert(BFL, 0x20, "Failed to open '%s' for read/write\n", argv[1]);
myassert(!setvbuf(BFL, NULL, _IOFBF, 1032), 0x21, "Failed to setup buffer for device");

// ZAX: Start firmware upload
printf("Starting firmware upload... ");
myassert(1 == fwrite("ZAX", 3, 1, BFL), 0x22, "Failed to issue ZAX command\n");
WAITFOROK(0x22, "ZAX");

// Firmware upload header
myassert(1 == fwrite(BFL_UPLOAD_MAGIC, sizeof(BFL_UPLOAD_MAGIC)-1, 1, BFL), 0x23, "Failed to send firmware upload header (magic)\n");
uint32_t n32 = htonl(FWlen - FWlen / 6);
myassert(1 == fwrite(&n32, sizeof(n32), 1, BFL), 0x23, "Failed to send firmware upload header (size)\n");
myassert(1 == fwrite("\0\0", 2 , 1, BFL), 0x23, "Failed to send firmware upload header (padding 1)\n");
myassert(1 == fwrite(&n8, sizeof(n8) , 1, BFL), 0x23, "Failed to send firmware upload header (filename length)\n");
myassert(1 == fwrite(FWname, n8 , 1, BFL), 0x23, "Failed to send firmware upload header (filename)\n");
myassert(1 == fwrite("\0>>>>>>>>", 9 , 1, BFL), 0x23, "Failed to send firmware upload header (padding 2)\n");
WAITFOROK(0x23, "firmware upload header");
printf("OK, sending...\n");

// Actual firmware upload
long i, j;
for (i = 0, j = 0; i < FWlen; ++i) {
myassert(1 == fread(&n8, sizeof(n8), 1, FW), 0x30, "Error reading data from firmware file\n");
if (5 == i % 6)
continue;
n8 ^= 0x2f;
myassert(1 == fwrite(&n8, sizeof(n8), 1, BFL), 0x31, "Error sending data to device\n");
if (!(++j % 0x400)) {
myassert(1 == fwrite(">>>>>>>>", 8, 1, BFL), 0x32, "Error sending block-finish to device\n");
printf("\r%5.2f%% complete", (double)i * 100. / (double)FWlen);
WAITFOROK(0x32, "block-finish");
}
}
printf("\r100%% complete :)\n");
myassert(1 == fwrite(">>>>>>>>", 8, 1, BFL), 0x3f, "Error sending upload-finished to device\n");
myassert(fgets(buf, sizeof(buf), BFL), 0x3f, "Error reading response from upload-finished\n");
myassert(!strcmp(buf, "DONE\n"), 0x3f, "Invalid response from upload-finished: %s%s", ERRRESP(buf));

// ZBX: Finish programming
printf("Waiting for device... ");
myassert(1 == fwrite("ZBX", 3, 1, BFL), 0x40, "Failed to issue ZBX command\n");
WAITFOROK(0x40, "ZBX");
printf("All done! Try mining to test the flash succeeded.\n");

return 0;
}
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