better input parsing/output formatting
authorMichael Gernoth <michael@gernoth.net>
Wed, 29 May 2013 19:36:24 +0000 (21:36 +0200)
committerMichael Gernoth <michael@gernoth.net>
Wed, 29 May 2013 19:36:24 +0000 (21:36 +0200)
hmcfgusb.c
hmcfgusb.h
hmland.c

index a73cd65..b8c1546 100644 (file)
@@ -49,7 +49,7 @@
 #define INTERFACE      0
 
 static int quit = 0;
-static int debug = 1;
+static int debug = 0;
 
 /* Not in all libusb-1.0 versions, so we have to roll our own :-( */
 static char * usb_strerror(int e)
@@ -422,3 +422,8 @@ void hmcfgusb_close(struct hmcfgusb_dev *dev)
 
        libusb_exit(NULL);
 }
+
+void hmcfgusb_set_debug(int d)
+{
+       debug = d;
+}
index 41e7e93..e33f6e6 100644 (file)
@@ -36,3 +36,4 @@ struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data);
 int hmcfgusb_add_pfd(struct hmcfgusb_dev *dev, int fd, short events);
 int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout);
 void hmcfgusb_close(struct hmcfgusb_dev *dev);
+void hmcfgusb_set_debug(int d);
index bccfa0d..f807164 100644 (file)
--- a/hmland.c
+++ b/hmland.c
 
 static int impersonate_hmlanif = 0;
 
+#define        FLAG_LENGTH_BYTE        (1<<0)
+#define        FLAG_FORMAT_HEX         (1<<1)
+#define        FLAG_COMMA_BEFORE       (1<<2)
+#define        FLAG_COMMA_AFTER        (1<<3)
+#define        FLAG_NL                 (1<<4)
+#define        FLAG_IGNORE_COMMAS      (1<<5)
+
+#define CHECK_SPACE(x)         if ((*outpos + x) > outend) { fprintf(stderr, "Not enough space!\n"); return 0; }
+#define CHECK_AVAIL(x)         if ((*inpos + x) > inend) { fprintf(stderr, "Not enough input available!\n"); return 0; }
+
+static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int len, int flags)
+{
+       uint8_t *buf_out = *outpos;
+       uint8_t *outend = *outpos + outlen;
+       uint8_t *inend = *inpos + inlen;
+       int i;
+
+       if (flags & FLAG_COMMA_BEFORE) {
+               CHECK_SPACE(1);
+               **outpos=',';
+               *outpos += 1;
+       }
+
+       if (flags & FLAG_LENGTH_BYTE) {
+               CHECK_AVAIL(1);
+               len = **inpos;
+               *inpos += 1;
+       }
+
+       if (flags & FLAG_FORMAT_HEX) {
+               char hex[3];
+
+               memset(hex, 0, sizeof(hex));
+
+               CHECK_AVAIL(len);
+               CHECK_SPACE(len*2);
+               for (i = 0; i < len; i++) {
+                       if (snprintf(hex, sizeof(hex), "%02X", **inpos) != 2) {
+                               fprintf(stderr, "Can't format hex-string!\n");
+                               return 0;
+                       }
+                       *inpos += 1;
+                       memcpy(*outpos, hex, 2);
+                       *outpos += 2;
+               }
+       } else {
+               CHECK_AVAIL(len);
+               CHECK_SPACE(len);
+               memcpy(*outpos, *inpos, len);
+               *outpos += len;
+               *inpos += len;
+       }
+
+       if (flags & FLAG_COMMA_AFTER) {
+               CHECK_SPACE(1);
+               **outpos=',';
+               *outpos += 1;
+       }
+
+       if (flags & FLAG_NL) {
+               CHECK_SPACE(2);
+               **outpos='\r';
+               *outpos += 1;
+               **outpos='\n';
+               *outpos += 1;
+       }
+
+       return *outpos - buf_out;
+}
+
+static int parse_part_in(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int flags)
+{
+       uint8_t *buf_out = *outpos;
+       uint8_t *outend = *outpos + outlen;
+       uint8_t *inend = *inpos + inlen;
+       char hex[3];
+
+       memset(hex, 0, sizeof(hex));
+
+       if (flags & FLAG_LENGTH_BYTE) {
+               int len = 0;
+               uint8_t *ip;
+
+               ip = *inpos;
+               while(ip < inend) {
+                       if (*ip == ',') {
+                               ip++;
+                               if (!(flags & FLAG_IGNORE_COMMAS))
+                                       break;
+
+                               continue;
+                       }
+                       len++;
+                       ip++;
+               }
+               CHECK_SPACE(1);
+               **outpos = (len / 2);
+               *outpos += 1;
+       }
+
+       while(*inpos < inend) {
+               if (**inpos == ',') {
+                       *inpos += 1;
+                       if (!(flags & FLAG_IGNORE_COMMAS))
+                               break;
+
+                       continue;
+               }
+
+               CHECK_SPACE(1);
+               CHECK_AVAIL(2);
+               memcpy(hex, *inpos, 2);
+               *inpos += 2;
+
+               **outpos = strtoul(hex, NULL, 16);
+               *outpos += 1;
+       }
+
+       return *outpos - buf_out;
+}
+
 static void hmlan_format_out(uint8_t *buf, int buf_len, void *data)
 {
-       char out[1024];
-       char *pos;
+       uint8_t out[1024];
+       uint8_t *outpos;
+       uint8_t *inpos;
        int fd = *((int*)data);
-       int len;
-       int i;
 
        if (buf_len < 1)
                return;
 
        memset(out, 0, sizeof(out));
-       pos = out;
+       outpos = out;
+       inpos = buf;
 
-       *pos++ = buf[0];
+       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, 0);
        switch(buf[0]) {
                case 'H':
                        if (impersonate_hmlanif) {
@@ -62,109 +183,61 @@ static void hmlan_format_out(uint8_t *buf, int buf_len, void *data)
                                buf[6] = 'A';
                                buf[7] = 'N';
                        }
-                       len = buf[1];
-                       for (i = 2; i < len + 2; i++) {
-                               *pos++=buf[i];
-                       }
-                       snprintf(pos, 7, ",%02X%02X,", buf[i], buf[i+1]);
-                       pos += 6;
-
-                       i += 2;
-                       len = buf[i]+i+1;
-                       i++;
-                       for (; i < len; i++) {
-                               *pos++=buf[i];
-                       }
-                       *pos++=',';
-                       len = i+12;
-                       for (; i < len; i++) {
-                               snprintf(pos, 3, "%02X", buf[i]);
-                               pos += 2;
-
-                               switch(len-i) {
-                                       case 10:
-                                       case 7:
-                                       case 3:
-                                               *pos++=',';
-                                               break;
-                                       default:
-                                               break;
-                               }
-                       }
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_LENGTH_BYTE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
 
                        break;
                case 'E':
-                       len = 13 + buf[13];
-                       for (i = 0; i < len; i++) {
-                               if (i != 12) {
-                                       snprintf(pos, 3, "%02X", buf[i+1]);
-                                       pos += 2;
-                               }
-                               switch(i) {
-                                       case 2:
-                                       case 4:
-                                       case 8:
-                                       case 9:
-                                       case 11:
-                                               *pos++=',';
-                                               break;
-                                       default:
-                                               break;
-                               }
-                       }
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE | FLAG_NL);
+
                        break;
                case 'R':
-                       len = 14 + buf[14];
-                       for (i = 0; i < len; i++) {
-                               if (i != 13) {
-                                       snprintf(pos, 3, "%02X", buf[i+1]);
-                                       pos += 2;
-                               }
-                               switch(i) {
-                                       case 3:
-                                       case 5:
-                                       case 9:
-                                       case 10:
-                                       case 12:
-                                               *pos++=',';
-                                               break;
-                                       default:
-                                               break;
-                               }
-                       }
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_LENGTH_BYTE | FLAG_NL);
+
                        break;
                case 'I':
-                       //HM> 0x0000: 49 00 00 00 00 55 53 42 2d 49 46 03 bc 0a 4a 45   I....USB-IF...JE
-                       //HM> 0x0010: 51 30 35 33 35 31 32 32 1d b1 55 68 ea 13 00 14   Q0535122..Uh....
-                       //HM> 0x0020: 9f a6 00 03 00 00 00 00 00 00 00 00 00 00 00 00   ................
-                       //HM> 0x0030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................ 
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
+
+                       break;
                default:
-                       for (i = 1; i < buf_len; i++) {
-                               snprintf(pos, 3, "%02X", buf[i]);
-                               pos += 2;
-                       }
+                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), buf_len-1, FLAG_FORMAT_HEX | FLAG_NL);
                        hexdump(buf, buf_len, "Unknown> ");
                        break;
        }
-       *pos++='\r';
-       *pos++='\n';
-       write(fd, out, pos-out);
+       write(fd, out, outpos-out);
 }
 
 static int hmlan_parse_in(int fd, void *data)
 {
        struct hmcfgusb_dev *dev = data;
-       unsigned char buf[1024];
-       unsigned char send_buf[0x40]; //FIXME!!!
-       char tmp[3];
+       uint8_t buf[1024];
+       uint8_t out[0x40]; //FIXME!!!
+       uint8_t *outpos;
+       uint8_t *inpos;
        int i;
        int r;
 
        r = read(fd, buf, sizeof(buf));
        if (r > 0) {
-               int cnt;
-
-               memset(send_buf, 0, sizeof(send_buf));
+               memset(out, 0, sizeof(out));
                for (i = 0; i < r; i++) {
                        if ((buf[i] == 0x0a) ||
                                        (buf[i] == 0x0d)) {
@@ -173,36 +246,28 @@ static int hmlan_parse_in(int fd, void *data)
                        }
                }
 
-               send_buf[0] = buf[0];
-
-               cnt = 0;
-               for (i = 1; i < r; i++) {
-                       if (buf[i] == ',') {
-                               switch (buf[0]) {
-                                       case 'S':
-                                               if (cnt == 4) {
-                                                       /* Add msg length */
-                                                       memmove(buf+i+2, buf+i+1, r-(i+1));
-                                                       snprintf(tmp, 3, "%02X", (int)((r-(i+1))/2));
-                                                       memcpy(buf+i, tmp, 2);
-                                                       r++;
-                                                       break;
-                                               }
-                                       default:
-                                               memmove(buf+i, buf+i+1, r-(i+1));
-                                               r--;
-                                               break;
-                               }
-                               cnt++;
-                       }
+               if (r == 0)
+                       return 1;
+
+               out[0] = buf[0];
+               outpos = out+1;
+               inpos = buf+1;
+
+               switch(buf[0]) {
+                       case 'S':
+                               parse_part_in(&inpos, (r-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                               parse_part_in(&inpos, (r-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                               parse_part_in(&inpos, (r-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                               parse_part_in(&inpos, (r-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                               parse_part_in(&inpos, (r-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                               parse_part_in(&inpos, (r-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
+                               break;
+                       default:
+                               parse_part_in(&inpos, (r-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
+                               break;
                }
 
-               memset(tmp, 0, sizeof(tmp));
-               for (i = 1; i < r; i+=2) {
-                       memcpy(tmp, buf + i, 2);
-                       send_buf[1+(i/2)] = strtoul(tmp, NULL, 16);
-               }
-               hmcfgusb_send(dev, send_buf, 1+(i/2), 1);
+               hmcfgusb_send(dev, out, outpos-out, 1);
        } else if (r < 0) {
                perror("read");
                return r;
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