parser.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Descriptor parsing functions
*/
#define USBA_FRAMEWORK
#include <sys/usb/usba/usba_impl.h>
#define INCREMENT_BUF(buf) \
if ((buf)[0] == 0) { \
break; \
} else { \
(buf) += (buf)[0]; \
}
#define isdigit(ch) ((ch >= '0') && (ch <= '9'))
extern usba_cfg_pwr_descr_t default_cfg_power;
extern usba_if_pwr_descr_t default_if_power;
size_t
usb_parse_data(char *format,
uchar_t *data,
size_t datalen,
void *structure,
size_t structlen)
{
int fmt;
int counter = 1;
int multiplier = 0;
uchar_t *dataend = data + datalen;
char *structstart = (char *)structure;
void *structend = (void *)((intptr_t)structstart + structlen);
if ((format == NULL) || (data == NULL) || (structure == NULL)) {
return (USB_PARSE_ERROR);
}
while ((fmt = *format) != '\0') {
/*
* Could some one pass a "format" that is greater than
* the structlen? Conversely, one could pass a ret_buf_len
* that is less than the "format" length.
* If so, we need to protect against writing over memory.
*/
if (counter++ > structlen) {
break;
}
if (fmt == 'c') {
uint8_t *cp = (uint8_t *)structure;
cp = (uint8_t *)(((uintptr_t)cp + _CHAR_ALIGNMENT - 1) &
~(_CHAR_ALIGNMENT - 1));
if (((data + 1) > dataend) ||
((cp + 1) > (uint8_t *)structend))
break;
*cp++ = *data++;
structure = (void *)cp;
if (multiplier) {
multiplier--;
}
if (multiplier == 0) {
format++;
}
} else if (fmt == 's') {
uint16_t *sp = (uint16_t *)structure;
sp = (uint16_t *)
(((uintptr_t)sp + _SHORT_ALIGNMENT - 1) &
~(_SHORT_ALIGNMENT - 1));
if (((data + 2) > dataend) ||
((sp + 1) > (uint16_t *)structend))
break;
*sp++ = (data[1] << 8) + data[0];
data += 2;
structure = (void *)sp;
if (multiplier) {
multiplier--;
}
if (multiplier == 0) {
format++;
}
} else if (fmt == 'l') {
uint32_t *lp = (uint32_t *)structure;
lp = (uint32_t *)
(((uintptr_t)lp + _INT_ALIGNMENT - 1) &
~(_INT_ALIGNMENT - 1));
if (((data + 4) > dataend) ||
((lp + 1) > (uint32_t *)structend))
break;
*lp++ = (((((
(uint32_t)data[3] << 8) | data[2]) << 8) |
data[1]) << 8) | data[0];
data += 4;
structure = (void *)lp;
if (multiplier) {
multiplier--;
}
if (multiplier == 0) {
format++;
}
} else if (fmt == 'L') {
uint64_t *llp = (uint64_t *)structure;
llp = (uint64_t *)
(((uintptr_t)llp + _LONG_LONG_ALIGNMENT - 1) &
~(_LONG_LONG_ALIGNMENT - 1));
if (((data + 8) > dataend) ||
((llp + 1) >= (uint64_t *)structend))
break;
*llp++ = (((((((((((((data[7] << 8) |
data[6]) << 8) | data[5]) << 8) |
data[4]) << 8) | data[3]) << 8) |
data[2]) << 8) | data[1]) << 8) |
data[0];
data += 8;
structure = (void *)llp;
if (multiplier) {
multiplier--;
}
if (multiplier == 0) {
format++;
}
} else if (isdigit(fmt)) {
multiplier = (multiplier * 10) + (fmt - '0');
format++;
} else {
multiplier = 0;
break;
}
}
return ((intptr_t)structure - (intptr_t)structstart);
}
size_t
usb_parse_CV_descr(char *format,
uchar_t *data,
size_t datalen,
void *structure,
size_t structlen)
{
return (usb_parse_data(format, data, datalen, structure,
structlen));
}
/*
* Helper function: returns pointer to n-th descriptor of
* type descr_type, unless the end of the buffer or a descriptor
* of type stop_descr_type1 or stop_descr_type2 is encountered first.
*/
static uchar_t *
usb_nth_descr(uchar_t *buf,
size_t buflen,
int descr_type,
uint_t n,
int stop_descr_type1,
int stop_descr_type2)
{
uchar_t *bufstart = buf;
uchar_t *bufend = buf + buflen;
if (buf == NULL) {
return (NULL);
}
while (buf + 2 <= bufend) {
if ((buf != bufstart) && ((buf[1] == stop_descr_type1) ||
(buf[1] == stop_descr_type2))) {
return (NULL);
}
if ((descr_type == USB_DESCR_TYPE_ANY) ||
(buf[1] == descr_type)) {
if (n-- == 0) {
return (buf);
}
}
/*
* Check for a bad buffer.
* If buf[0] is 0, then this will be an infite loop
*/
INCREMENT_BUF(buf);
}
return (NULL);
}
size_t
usb_parse_dev_descr(uchar_t *buf, /* from GET_DESCRIPTOR(DEVICE) */
size_t buflen,
usb_dev_descr_t *ret_descr,
size_t ret_buf_len)
{
if ((buf == NULL) || (ret_descr == NULL) ||
(buflen < 2) || (buf[1] != USB_DESCR_TYPE_DEV)) {
return (USB_PARSE_ERROR);
}
return (usb_parse_data("ccsccccssscccc",
buf, buflen, ret_descr, ret_buf_len));
}
size_t
usb_parse_cfg_descr(uchar_t *buf, /* from GET_DESCRIPTOR(CONFIGURATION) */
size_t buflen,
usb_cfg_descr_t *ret_descr,
size_t ret_buf_len)
{
if ((buf == NULL) || (ret_descr == NULL) ||
(buflen < 2) || (buf[1] != USB_DESCR_TYPE_CFG)) {
return (USB_PARSE_ERROR);
}
return (usb_parse_data("ccsccccc",
buf, buflen, ret_descr, ret_buf_len));
}
size_t
usba_parse_cfg_pwr_descr(
uchar_t *buf, /* from GET_DESCRIPTOR(CONFIGURATION) */
size_t buflen,
usba_cfg_pwr_descr_t *ret_descr,
size_t ret_buf_len)
{
uchar_t *bufend = buf + buflen;
if ((buf == NULL) || (ret_descr == NULL)) {
return (USB_PARSE_ERROR);
}
while (buf + 2 <= bufend) {
if (buf[1] == USBA_DESCR_TYPE_CFG_PWR_1_1) {
return (usb_parse_data("ccsccccccccsss",
buf, buflen, ret_descr, ret_buf_len));
}
/*
* Check for a bad buffer.
* If buf[0] is 0, then this will be an infinite loop
*/
INCREMENT_BUF(buf);
}
/* return the default configuration power descriptor */
bcopy(&default_cfg_power, ret_descr, USBA_CFG_PWR_DESCR_SIZE);
return (ret_descr->bLength);
}
size_t
usb_parse_if_descr(uchar_t *buf, /* from GET_DESCRIPTOR(CONFIGURATION) */
size_t buflen,
uint_t if_number,
uint_t alt_if_setting,
usb_if_descr_t *ret_descr,
size_t ret_buf_len)
{
uchar_t *bufend = buf + buflen;
if ((buf == NULL) || (ret_descr == NULL)) {
return (USB_PARSE_ERROR);
}
while (buf + 4 <= bufend) {
if ((buf[1] == USB_DESCR_TYPE_IF) &&
(buf[2] == if_number) &&
(buf[3] == alt_if_setting)) {
return (usb_parse_data("ccccccccc",
buf, bufend - buf, ret_descr, ret_buf_len));
}
/*
* Check for a bad buffer.
* If buf[0] is 0, then this will be an infinite loop
*/
INCREMENT_BUF(buf);
}
return (USB_PARSE_ERROR);
}
size_t
usba_parse_if_pwr_descr(uchar_t *buf, /* from GET_DESCRIPTOR(CONFIGURATION) */
size_t buflen,
uint_t if_number,
uint_t alt_if_setting,
usba_if_pwr_descr_t *ret_descr,
size_t ret_buf_len)
{
uchar_t *bufend = buf + buflen;
if ((buf == NULL) || (ret_descr == NULL)) {
return (USB_PARSE_ERROR);
}
while (buf + 4 <= bufend) {
if ((buf[1] == USB_DESCR_TYPE_IF) &&
(buf[2] == if_number) &&
(buf[3] == alt_if_setting)) {
buf += buf[0];
if (buf + 2 <= bufend) {
if (buf[1] == USBA_DESCR_TYPE_IF_PWR_1_1) {
return (
usb_parse_data("cccccccccsss",
buf, bufend - buf, ret_descr,
ret_buf_len));
} else {
break;
}
} else {
break;
}
}
/*
* Check for a bad buffer.
* If buf[0] is 0, then this will be an infinite loop
*/
INCREMENT_BUF(buf);
}
/* return the default interface power descriptor */
bcopy(&default_if_power, ret_descr, USBA_IF_PWR_DESCR_SIZE);
return (ret_descr->bLength);
}
/*
* the endpoint index is relative to the interface. index 0 is
* the first endpoint
*/
size_t
usb_parse_ep_descr(uchar_t *buf, /* from GET_DESCRIPTOR(CONFIGURATION) */
size_t buflen,
uint_t if_number,
uint_t alt_if_setting,
uint_t ep_index,
usb_ep_descr_t *ret_descr,
size_t ret_buf_len)
{
uchar_t *bufend = buf + buflen;
if ((buf == NULL) || (ret_descr == NULL)) {
return (USB_PARSE_ERROR);
}
while ((buf + 4) <= bufend) {
if (buf[1] == USB_DESCR_TYPE_IF &&
buf[2] == if_number &&
buf[3] == alt_if_setting) {
if ((buf = usb_nth_descr(buf, bufend - buf,
USB_DESCR_TYPE_EP, ep_index,
USB_DESCR_TYPE_IF, -1)) == NULL) {
break;
}
return (usb_parse_data("ccccsc",
buf, bufend - buf,
ret_descr, ret_buf_len));
}
/*
* Check for a bad buffer.
* If buf[0] is 0, then this will be an infinite loop
*/
INCREMENT_BUF(buf);
}
return (USB_PARSE_ERROR);
}
/*
* Returns (at ret_descr) a null-terminated string. Null termination is
* guaranteed, even if the string is longer than the buffer. Thus, a
* maximum of (ret_buf_len - 1) characters are returned.
* Stops silently on first character not in UNICODE format.
*/
/*ARGSUSED*/
size_t
usba_ascii_string_descr(uchar_t *buf, /* from GET_DESCRIPTOR(STRING) */
size_t buflen,
char *ret_descr,
size_t ret_buf_len)
{
int i = 1;
char *retstart = ret_descr;
uchar_t *bufend = buf + buflen;
if ((buf == NULL) || (ret_descr == NULL) ||
(ret_buf_len == 0) || (buflen < 2) ||
(buf[0] < 2) || (buf[1] != USB_DESCR_TYPE_STRING)) {
return (USB_PARSE_ERROR);
}
for (buf = buf + 2; buf+1 < bufend && ret_buf_len > 1 &&
buf[0] != 0 && buf[1] == 0 && (i < ret_buf_len); buf += 2, i++) {
*ret_descr++ = buf[0];
}
*ret_descr++ = 0;
return (ret_descr - retstart);
}
size_t
usb_parse_CV_cfg_descr(uchar_t *buf, /* from GET_DESCRIPTOR(CONFIGURATION) */
size_t buflen,
char *fmt,
uint_t descr_type,
uint_t descr_index,
void *ret_descr,
size_t ret_buf_len)
{
uchar_t *bufend = buf + buflen;
if ((buf == NULL) || (ret_descr == NULL) || (fmt == NULL) ||
(buflen < 2) || ((buf = usb_nth_descr(buf, buflen, descr_type,
descr_index, -1, -1)) == NULL)) {
return (USB_PARSE_ERROR);
}
return (usb_parse_data(fmt, buf, bufend - buf, ret_descr,
ret_buf_len));
}
size_t
usb_parse_CV_if_descr(uchar_t *buf, /* from GET_DESCRIPTOR(CONFIGURATION) */
size_t buflen,
char *fmt,
uint_t if_number,
uint_t alt_if_setting,
uint_t descr_type,
uint_t descr_index,
void *ret_descr,
size_t ret_buf_len)
{
uchar_t *bufend = buf + buflen;
if ((buf == NULL) || (ret_descr == NULL) || (fmt == NULL)) {
return (USB_PARSE_ERROR);
}
while (buf + 4 <= bufend) {
if ((buf[1] == USB_DESCR_TYPE_IF) &&
(buf[2] == if_number) &&
(buf[3] == alt_if_setting)) {
if ((buf = usb_nth_descr(buf, bufend - buf, descr_type,
descr_index, USB_DESCR_TYPE_IF, -1)) ==
NULL) {
break;
}
return (usb_parse_data(fmt,
buf, bufend - buf, ret_descr, ret_buf_len));
}
/*
* Check for a bad buffer.
* If buf[0] is 0, then this will be an infinite loop
*/
INCREMENT_BUF(buf);
}
return (USB_PARSE_ERROR);
}
size_t
usb_parse_CV_ep_descr(uchar_t *buf, /* from GET_DESCRIPTOR(CONFIGURATION) */
size_t buflen,
char *fmt,
uint_t if_number,
uint_t alt_if_setting,
uint_t ep_index,
uint_t descr_type,
uint_t descr_index,
void *ret_descr,
size_t ret_buf_len)
{
uchar_t *bufend = buf + buflen;
if ((buf == NULL) || (ret_descr == NULL) || (fmt == NULL)) {
return (USB_PARSE_ERROR);
}
while (buf + 4 <= bufend) {
if ((buf[1] == USB_DESCR_TYPE_IF) &&
(buf[2] == if_number) &&
(buf[3] == alt_if_setting)) {
if ((buf = usb_nth_descr(buf, bufend - buf,
USB_DESCR_TYPE_EP, ep_index,
USB_DESCR_TYPE_IF, -1)) == NULL) {
break;
}
if ((buf = usb_nth_descr(buf, bufend - buf,
descr_type, descr_index,
USB_DESCR_TYPE_EP,
USB_DESCR_TYPE_IF)) == NULL) {
break;
}
return (usb_parse_data(fmt, buf, bufend - buf,
ret_descr, ret_buf_len));
}
/*
* Check for a bad buffer.
* If buf[0] is 0, then this will be an infite loop
*/
INCREMENT_BUF(buf);
}
return (USB_PARSE_ERROR);
}