commit ada3e18cd35ee6df52f76497d480e783dacebed1
Author: Wen-chien Jesse Sung <jesse@cola.voip.idv.tw>
Date:   Fri Jul 6 18:16:09 2012 +0800

    Initial import

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b914bfa
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,11 @@
+TARGET	= hex2hcd
+CFLAGS	= -O2 -march=native
+CC	= gcc
+
+all:	$(TARGET)
+
+$(TARGET):	$(TARGET).c
+
+clean:
+	-rm $(TARGET)
+
diff --git a/hex2hcd.c b/hex2hcd.c
new file mode 100644
index 0000000..e693676
--- /dev/null
+++ b/hex2hcd.c
@@ -0,0 +1,116 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+
+#define RBUF_SIZE	640
+
+static unsigned int asc_to_int(char a)
+{
+	if (a >= 'A')
+		return (a - 'A') + 10;
+	else
+		return a - '0';
+}
+
+static unsigned int hex_to_int(const char *h)
+{
+	return asc_to_int(*h) * 0x10 + asc_to_int(*(h + 1));
+}
+
+static unsigned int lhex_to_int(const char *h)
+{
+	return hex_to_int(h) * 0x100 + hex_to_int(h + 2);
+}
+
+static int check_sum(const char *str, int len)
+{
+	unsigned int sum, cal;
+	int i;
+	sum = hex_to_int(str + len - 2);
+	for (cal = 0, i = 1; i < len - 2; i += 2)
+		cal += hex_to_int(str + i);
+	cal = 0x100 - cal & 0xFF;
+	return sum == cal;
+}
+
+static int check_hex_line(const char *str, int len)
+{
+	if ((str[0] != ':') || (len < 11) || !check_sum(str, len) ||
+		(hex_to_int(str + 1) * 2 + 11 != len))
+		return 0;
+	return 1;
+}
+
+int main(int argc, char *argv[])
+{
+	unsigned int addr = 0;
+	FILE *ifp, *ofp;
+	char *rbuf;
+	ssize_t len, i;
+	size_t buflen;
+
+	if (argc != 3) {
+		printf("Usage: %s <input hex file> <output file>\n", argv[0]);
+		return 0;
+	}
+
+	ifp = fopen(argv[1], "r");
+	ofp = fopen(argv[2], "w");
+	if ((ifp == NULL) || (ofp == NULL)) {
+		puts("failed to open file.");
+		return -EIO;
+	}
+
+	rbuf = NULL;
+	while ((len = getline(&rbuf, &buflen, ifp)) > 0) {
+		int type;
+		char obuf[7];
+		unsigned int dest_addr;
+		while ((rbuf[len - 1] == '\r') || (rbuf[len - 1] == '\n'))
+			len--;
+		printf("%d, %s\n", (int)len, rbuf);
+		if (!check_hex_line(rbuf, len))
+			break;
+		type = hex_to_int(rbuf + 7);
+		switch (type) {
+			case 4:
+				addr = lhex_to_int(rbuf + 9) * 0x10000;
+				printf("bump addr to 0x%08X\n", addr);
+				break;
+			case 0:
+				dest_addr = addr + lhex_to_int(rbuf + 3);
+				obuf[0] = 0x4c;
+				obuf[1] = 0xfc;
+				obuf[2] = hex_to_int(rbuf + 1) + 4;
+				obuf[3] = dest_addr;
+				obuf[4] = dest_addr >> 8;
+				obuf[5] = dest_addr >> 16;
+				obuf[6] = dest_addr >> 24;
+				if (fwrite(obuf, 7, 1, ofp) != 1)
+					goto output_err;
+				for (i = 0; i < hex_to_int(rbuf + 1); i++) {
+					obuf[0] = hex_to_int(rbuf + 9 + i * 2);
+					if (fwrite(obuf, 1, 1, ofp) != 1)
+						goto output_err;
+				}
+				break;
+			case 1:
+				if (fwrite("\x4e\xfc\x04\xff\xff\xff\xff", 7, 1, ofp) != 1)
+					goto output_err;
+				goto end;
+			default:
+				return -EINVAL;
+		}
+	}
+
+	puts("hex file formatting error");
+	return -EINVAL;
+
+output_err:
+	puts("error on writing output file");
+	return -EIO;
+
+end:
+	return 0;
+}
+