+/* generic firmware-functions for HomeMatic
+ *
+ * Copyright (c) 2014 Michael Gernoth <michael@gernoth.net>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <string.h>
+#include <strings.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/time.h>
+
+#include "firmware.h"
+
+/* This might be wrong, but it works for current fw */
+#define MAX_BLOCK_LENGTH 512
+
+static uint8_t ascii_to_nibble(uint8_t a)
+{
+ uint8_t c = 0x00;
+
+ if ((a >= '0') && (a <= '9')) {
+ c = a - '0';
+ } else if ((a >= 'A') && (a <= 'F')) {
+ c = (a - 'A') + 10;
+ } else if ((a >= 'a') && (a <= 'f')) {
+ c = (a - 'a') + 10;
+ }
+
+ return c;
+}
+
+static int validate_nibble(uint8_t a)
+{
+ if (((a >= '0') && (a <= '9')) ||
+ ((a >= 'A') && (a <= 'F')) ||
+ ((a >= 'a') && (a <= 'f')))
+ return 1;
+
+ return 0;
+}
+
+struct firmware* firmware_read_firmware(char *filename, int debug)
+{
+ struct firmware *fw;
+ struct stat stat_buf;
+ uint8_t buf[4096];
+ uint16_t len;
+ int fd;
+ int r;
+ int i;
+
+ fw = malloc(sizeof(struct firmware));
+ if (!fw) {
+ perror("malloc(fw)");
+ return NULL;
+ }
+
+ memset(fw, 0, sizeof(struct firmware));
+
+ if (stat(filename, &stat_buf) == -1) {
+ fprintf(stderr, "Can't stat %s: %s\n", filename, strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0) {
+ fprintf(stderr, "Can't open %s: %s", filename, strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+
+ printf("Reading firmware from %s...\n", filename);
+ do {
+ memset(buf, 0, sizeof(buf));
+ r = read(fd, buf, 4);
+ if (r < 0) {
+ perror("read");
+ exit(EXIT_FAILURE);
+ } else if (r == 0) {
+ break;
+ } else if (r != 4) {
+ printf("can't get length information!\n");
+ exit(EXIT_FAILURE);
+ }
+
+ for (i = 0; i < r; i++) {
+ if (!validate_nibble(buf[i])) {
+ fprintf(stderr, "Firmware file not valid!\n");
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ len = (ascii_to_nibble(buf[0]) & 0xf)<< 4;
+ len |= ascii_to_nibble(buf[1]) & 0xf;
+ len <<= 8;
+ len |= (ascii_to_nibble(buf[2]) & 0xf)<< 4;
+ len |= ascii_to_nibble(buf[3]) & 0xf;
+
+ /* This might be wrong, but it works for current fw->fw */
+ if (len > MAX_BLOCK_LENGTH) {
+ fprintf(stderr, "Invalid block-length %u > %u for block %d!\n", len, MAX_BLOCK_LENGTH, fw->fw_blocks+1);
+ exit(EXIT_FAILURE);
+ }
+
+ fw->fw = realloc(fw->fw, sizeof(uint8_t*) * (fw->fw_blocks + 1));
+ if (fw->fw == NULL) {
+ perror("Can't reallocate fw->fw-blocklist");
+ exit(EXIT_FAILURE);
+ }
+
+ fw->fw[fw->fw_blocks] = malloc(len + 4);
+ if (fw->fw[fw->fw_blocks] == NULL) {
+ perror("Can't allocate memory for fw->fw-block");
+ exit(EXIT_FAILURE);
+ }
+
+ fw->fw[fw->fw_blocks][0] = (fw->fw_blocks >> 8) & 0xff;
+ fw->fw[fw->fw_blocks][1] = fw->fw_blocks & 0xff;
+ fw->fw[fw->fw_blocks][2] = (len >> 8) & 0xff;
+ fw->fw[fw->fw_blocks][3] = len & 0xff;
+
+ r = read(fd, buf, len * 2);
+ if (r < 0) {
+ perror("read");
+ exit(EXIT_FAILURE);
+ } else if (r < len * 2) {
+ fprintf(stderr, "short read, aborting (%d < %d)\n", r, len * 2);
+ exit(EXIT_FAILURE);
+ }
+
+ for (i = 0; i < r; i+=2) {
+ if ((!validate_nibble(buf[i])) ||
+ (!validate_nibble(buf[i+1]))) {
+ fprintf(stderr, "Firmware file not valid!\n");
+ exit(EXIT_FAILURE);
+ }
+
+ fw->fw[fw->fw_blocks][(i/2) + 4] = (ascii_to_nibble(buf[i]) & 0xf)<< 4;
+ fw->fw[fw->fw_blocks][(i/2) + 4] |= ascii_to_nibble(buf[i+1]) & 0xf;
+ }
+
+ fw->fw_blocks++;
+ if (debug)
+ printf("Firmware block %d with length %u read.\n", fw->fw_blocks, len);
+ } while(r > 0);
+
+ if (fw->fw_blocks == 0) {
+ fprintf(stderr, "Firmware file not valid!\n");
+ exit(EXIT_FAILURE);
+ }
+
+ printf("Firmware with %d blocks successfully read.\n", fw->fw_blocks);
+
+ return fw;
+}
+
+void firmware_free(struct firmware *fw)
+{
+ int i;
+
+ for (i = 0; i < fw->fw_blocks; i++)
+ free(fw->fw[i]);
+
+ free(fw->fw);
+ free(fw);
+}
projects / hmcfgusb / commitdiff