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/* AT91SAM7 USB string descriptor builder
* (C) 2006 by Harald Welte <laforge@gnumonks.org>
*
* 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 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* Based on existing utf8_to_utf16le() function,
* Copyright (C) 2003 David Brownell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*/
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
static int utf8_to_utf16le(const char *s, u_int16_t *cp, unsigned len)
{
int count = 0;
u_int8_t c;
u_int16_t uchar;
/* this insists on correct encodings, though not minimal ones.
* BUT it currently rejects legit 4-byte UTF-8 code points,
* which need surrogate pairs. (Unicode 3.1 can use them.)
*/
while (len != 0 && (c = (u_int8_t) *s++) != 0) {
if (c & 0x80) {
// 2-byte sequence:
// 00000yyyyyxxxxxx = 110yyyyy 10xxxxxx
if ((c & 0xe0) == 0xc0) {
uchar = (c & 0x1f) << 6;
c = (u_int8_t) *s++;
if ((c & 0xc0) != 0xc0)
goto fail;
c &= 0x3f;
uchar |= c;
// 3-byte sequence (most CJKV characters):
// zzzzyyyyyyxxxxxx = 1110zzzz 10yyyyyy 10xxxxxx
} else if ((c & 0xf0) == 0xe0) {
uchar = (c & 0x0f) << 12;
c = (u_int8_t) *s++;
if ((c & 0xc0) != 0xc0)
goto fail;
c &= 0x3f;
uchar |= c << 6;
c = (u_int8_t) *s++;
if ((c & 0xc0) != 0xc0)
goto fail;
c &= 0x3f;
uchar |= c;
/* no bogus surrogates */
if (0xd800 <= uchar && uchar <= 0xdfff)
goto fail;
// 4-byte sequence (surrogate pairs, currently rare):
// 11101110wwwwzzzzyy + 110111yyyyxxxxxx
// = 11110uuu 10uuzzzz 10yyyyyy 10xxxxxx
// (uuuuu = wwww + 1)
// FIXME accept the surrogate code points (only)
} else
goto fail;
} else
uchar = c;
*cp++ = uchar;
count++;
len--;
}
return count;
fail:
return -1;
}
#define COLUMNS 6
static int print_array16(u_int16_t *buf, int len)
{
int i;
for (i = 0; i < len; i++) {
int mod = i % COLUMNS;
char *suffix;
char *prefix;
switch (mod) {
case 0:
if (i == 0)
prefix = "\t";
else
prefix= "\t\t\t";
suffix = ", ";
break;
case COLUMNS-1:
prefix = "";
suffix = ",\n";
break;
default:
prefix = "";
suffix = ", ";
break;
}
printf("%s0x%04x%s", prefix, buf[i], suffix);
}
}
static void print_structhdr(int i, int size)
{
printf( "static const struct {\n"
"\tstruct usb_descriptor_header hdr;\n"
"\tu_int16_t wData[];\n"
"} __attribute__((packed)) string%d = {\n"
"\t.hdr = {\n"
"\t\t.bLength = sizeof(struct usb_descriptor_header) + %u * sizeof(u_int16_t),\n"
"\t\t.bDescriptorType = USB_DT_STRING,\n"
"\t},\n"
"\t.wData = {", i, size);
}
static void print_structftr(void)
{
printf("},\n};\n\n");
}
int main(int argc, char **argv)
{
char asciibuf[512+1];
u_int16_t utf16buf[1024+1];
int len;
int j, i = 1;
printf("#ifndef _USB_STRINGS_H\n#define _USB_STRINGS_H\n\n");
printf("/* THIS FILE IS AUTOGENERATED, DO NOT MODIFY MANUALLY */\n\n");
printf("#include <usb_ch9.h>\n");
printf("#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))\n\n");
print_structhdr(0, 1);
printf("0x0409 /* English */ ");
print_structftr();
#if 0
printf("static const struct usb_string_descriptor string0 = {\n"
"\t.bLength = sizeof(string0) + 1 * sizeof(u_int16_t),\n"
"\t.bDescriptorType = USB_DT_STRING,\n"
"\t.wData[0] = 0x0409, /* English */\n"
"};\n\n");
#endif
while (scanf("%512[^\n]\n", asciibuf) != EOF) {
len = strlen(asciibuf);
printf("/* String %u \"%s\" */\n", i, asciibuf);
/* FIXME: check return value */
utf8_to_utf16le(asciibuf, utf16buf, len);
print_structhdr(i, len);
#if 0
printf("static const struct usb_string_descriptor string%d = {\n"
"\t.bLength = sizeof(string%d) + %d * sizeof(u_int16_t),\n"
"\t.bDescriptorType = USB_DT_STRING,\n"
"\t.wData = {", i, i, len);
#endif
print_array16(utf16buf, len);
print_structftr();
#if 0
printf("},\n};\n\n");
#endif
i++;
}
printf("static const struct usb_descriptor_header *usb_strings[] = {\n");
for (j = 0; j < i; j++)
printf("\t(struct usb_descriptor_header *) &string%d,\n", j);
printf("};\n\n");
printf("#endif /* _USB_STRINGS_H */\n");
}
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