add utility program for generating USB strings
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/* AT91SAM7 USB string descriptor builder
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* (C) 2006 by Harald Welte <laforge@gnumonks.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* Based on existing utf8_to_utf16le() function,
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* Copyright (C) 2003 David Brownell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*/
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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static int utf8_to_utf16le(const char *s, u_int16_t *cp, unsigned len)
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{
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int count = 0;
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u_int8_t c;
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u_int16_t uchar;
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/* this insists on correct encodings, though not minimal ones.
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* BUT it currently rejects legit 4-byte UTF-8 code points,
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* which need surrogate pairs. (Unicode 3.1 can use them.)
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*/
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while (len != 0 && (c = (u_int8_t) *s++) != 0) {
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if (c & 0x80) {
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// 2-byte sequence:
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// 00000yyyyyxxxxxx = 110yyyyy 10xxxxxx
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if ((c & 0xe0) == 0xc0) {
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uchar = (c & 0x1f) << 6;
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c = (u_int8_t) *s++;
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if ((c & 0xc0) != 0xc0)
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goto fail;
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c &= 0x3f;
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uchar |= c;
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// 3-byte sequence (most CJKV characters):
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// zzzzyyyyyyxxxxxx = 1110zzzz 10yyyyyy 10xxxxxx
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} else if ((c & 0xf0) == 0xe0) {
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uchar = (c & 0x0f) << 12;
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c = (u_int8_t) *s++;
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if ((c & 0xc0) != 0xc0)
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goto fail;
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c &= 0x3f;
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uchar |= c << 6;
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c = (u_int8_t) *s++;
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if ((c & 0xc0) != 0xc0)
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goto fail;
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c &= 0x3f;
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uchar |= c;
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/* no bogus surrogates */
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if (0xd800 <= uchar && uchar <= 0xdfff)
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goto fail;
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// 4-byte sequence (surrogate pairs, currently rare):
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// 11101110wwwwzzzzyy + 110111yyyyxxxxxx
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// = 11110uuu 10uuzzzz 10yyyyyy 10xxxxxx
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// (uuuuu = wwww + 1)
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// FIXME accept the surrogate code points (only)
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} else
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goto fail;
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} else
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uchar = c;
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*cp++ = uchar;
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count++;
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len--;
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}
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return count;
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fail:
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return -1;
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}
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#define COLUMNS 6
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static int print_array16(u_int16_t *buf, int len)
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{
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int i;
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for (i = 0; i < len; i++) {
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int mod = i % COLUMNS;
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char *suffix;
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char *prefix;
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switch (mod) {
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case 0:
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if (i == 0)
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prefix = "\t";
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else
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prefix= "\t\t\t";
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suffix = ", ";
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break;
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case COLUMNS-1:
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prefix = "";
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suffix = ",\n";
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break;
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default:
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prefix = "";
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suffix = ", ";
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break;
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}
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printf("%s0x%04x%s", prefix, buf[i], suffix);
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}
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}
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static void print_structhdr(int i, int size)
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{
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printf( "static const struct {\n"
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"\tstruct usb_descriptor_header hdr;\n"
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"\tuint16_t wData[];\n"
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"} __attribute__((packed)) string%d = {\n"
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"\t.hdr = {\n"
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"\t\t.bLength = USBStringDescriptor_LENGTH(%u),\n"
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"\t\t.bDescriptorType = USBGenericDescriptor_STRING,\n"
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"\t},\n"
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"\t.wData = {", i, size);
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}
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static void print_structftr(void)
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{
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printf("},\n};\n\n");
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}
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int main(int argc, char **argv)
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{
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char asciibuf[512+1];
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u_int16_t utf16buf[1024+1];
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int len;
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int j, i = 1;
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printf("#ifndef _USB_STRINGS_H\n#define _USB_STRINGS_H\n\n");
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printf("/* THIS FILE IS AUTOGENERATED, DO NOT MODIFY MANUALLY */\n\n");
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printf("#include <stdint.h>\n");
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printf("#include <usb/common/core/USBGenericDescriptor.h>\n");
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printf("#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))\n\n");
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printf("/* All standard descriptors have these 2 fields at the beginning */\n\n");
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printf("struct usb_descriptor_header {\n"
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"\tuint8_t bLength;\n"
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"\tuint8_t bDescriptorType;\n"
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"} __attribute__ ((packed));\n\n");
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print_structhdr(0, 1);
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printf("0x0409 /* English */ ");
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print_structftr();
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while (scanf("%512[^\n]\n", asciibuf) != EOF) {
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len = strlen(asciibuf);
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printf("/* String %u \"%s\" */\n", i, asciibuf);
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/* FIXME: check return value */
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utf8_to_utf16le(asciibuf, utf16buf, len);
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print_structhdr(i, len);
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print_array16(utf16buf, len);
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print_structftr();
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i++;
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}
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#if 0
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printf("static const unsigned char *usb_strings[] = {\n");
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for (j = 0; j < i; j++)
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printf("\t(const unsigned char *) &string%d,\n", j);
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printf("};\n\n");
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#else
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printf("#define USB_STRINGS_GENERATED\t\t\t\t\\\n");
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for (j = 0; j < i; j++)
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printf("\t(const unsigned char *) &string%d,\t\t\\\n", j);
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printf("\n");
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#endif
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printf("#endif /* _USB_STRINGS_H */\n");
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exit(0);
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}
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