ibmf_utils.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
*/
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/inttypes.h>
#include <sys/ib/mgt/ibmf/ibmf_utils.h>
#include <sys/debug.h>
#define INCREMENT_BUF(buf) \
if ((buf)[0] == 0) { \
break; \
} else { \
(buf) += (buf)[0]; \
}
#define isdigit(ch) ((ch >= '0') && (ch <= '9'))
/*
* ibmf_utils_unpack_data:
*
* parser function which takes a format string, a void pointer, and a character
* buffer and parses the buffer according to the identifiers in the format
* string. Copies the data from the buffer and places into the structure,
* taking care of byte swapping and any padding due to 64-bit Solaris. Modified
* from /ws/on81-gate/usr/src/uts/common/io/usb/usba/parser.c.
*
* The data and structure length parameters can be larger than the number of
* bytes specified in the format. unpack_data will use the smallest of the
* three values, stopping when it finishes parsing the format string or reaches
* the end of one of the two buffers.
*/
void
ibmf_utils_unpack_data(char *format,
uchar_t *data,
size_t datalen,
void *structure,
size_t structlen)
{
int fmt;
int multiplier = 0;
uchar_t *dataend = data + datalen;
char *structstart = (char *)structure;
void *structend = (void *)((intptr_t)structstart + structlen);
while ((fmt = *format) != '\0') {
if (fmt == 'c') {
uint8_t *cp = (uint8_t *)structure;
/*
* account for possible hole in structure
* due to unaligned data
*/
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;
/*
* account for possible hole in structure
* due to unaligned data
*/
sp = (uint16_t *)
(((uintptr_t)sp + _SHORT_ALIGNMENT - 1) &
~(_SHORT_ALIGNMENT - 1));
if (((data + 2) > dataend) ||
((sp + 1) > (uint16_t *)structend))
break;
*sp++ = (data[0] << 8) + data[1];
data += 2;
structure = (void *)sp;
if (multiplier) {
multiplier--;
}
if (multiplier == 0) {
format++;
}
} else if (fmt == 'l') {
uint32_t *lp = (uint32_t *)structure;
/*
* account for possible hole in structure
* due to unaligned data
*/
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[0] << 8) | data[1]) << 8)
| data[2]) << 8) | data[3];
data += 4;
structure = (void *)lp;
if (multiplier) {
multiplier--;
}
if (multiplier == 0) {
format++;
}
} else if (fmt == 'L') {
uint64_t *llp = (uint64_t *)structure;
/*
* account for possible hole in structure
* due to unaligned data
*/
llp = (uint64_t *)
(((uintptr_t)llp + _LONG_LONG_ALIGNMENT - 1) &
~(_LONG_LONG_ALIGNMENT - 1));
if (((data + 8) > dataend) ||
((llp + 1) > (uint64_t *)structend))
break;
/*
* note: data[0] is cast to uint64_t so that the
* compiler wouldn't treat the results of the shifts
* as a 32bit quantity; we really want to get 64bits
* out of this.
*/
*llp++ = ((((((((((((((uint64_t)data[0] << 8) |
data[1]) << 8) | data[2]) << 8) |
data[3]) << 8) | data[4]) << 8) |
data[5]) << 8) | data[6]) << 8) |
data[7];
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;
}
}
}
/*
* ibmf_utils_pack_data:
*
* parser function which takes a format string, a void pointer, and a character
* buffer and parses the structure according to the identifiers in the format
* string. Copies the data from the structure and places in the buffer, taking
* care of byte swapping and any padding due to 64-bit Solaris. Modified from
* /ws/on81-gate/usr/src/uts/common/io/usb/usba/parser.c.
*
*/
void
ibmf_utils_pack_data(char *format, void *structure,
size_t structlen, uchar_t *data, size_t datalen)
{
int fmt;
int multiplier = 0;
uchar_t *dataend = data + datalen;
char *structend = (void *)((uchar_t *)structure + structlen);
while ((fmt = *format) != '\0') {
if (fmt == 'c') {
uint8_t *cp = (uint8_t *)structure;
/*
* account for possible hole in structure
* due to unaligned data
*/
cp = (uint8_t *)
(((uintptr_t)cp + _CHAR_ALIGNMENT - 1) &
~(_CHAR_ALIGNMENT - 1));
if (((data + 1) > dataend) ||
((cp + 1) > (uint8_t *)structend)) {
break;
}
*data++ = *cp++;
structure = (void *)cp;
if (multiplier) {
multiplier--;
}
if (multiplier == 0) {
format++;
}
} else if (fmt == 's') {
uint16_t *sp = (uint16_t *)structure;
/*
* account for possible hole in structure
* due to unaligned data
*/
sp = (uint16_t *)
(((uintptr_t)sp + _SHORT_ALIGNMENT - 1) &
~(_SHORT_ALIGNMENT - 1));
if (((data + 2) > dataend) ||
((sp + 1) > (uint16_t *)structend))
break;
/* do an endian-independent copy */
data[0] = (uchar_t)(*sp >> 8);
data[1] = (uchar_t)(*sp);
sp++;
data += 2;
structure = (void *)sp;
if (multiplier) {
multiplier--;
}
if (multiplier == 0) {
format++;
}
} else if (fmt == 'l') {
uint32_t *lp = (uint32_t *)structure;
/*
* account for possible hole in structure
* due to unaligned data
*/
lp = (uint32_t *)
(((uintptr_t)lp + _INT_ALIGNMENT - 1) &
~(_INT_ALIGNMENT - 1));
if (((data + 4) > dataend) ||
((lp + 1) > (uint32_t *)structend))
break;
/* do an endian-independent copy */
data[0] = (uchar_t)(*lp >> 24);
data[1] = (uchar_t)(*lp >> 16);
data[2] = (uchar_t)(*lp >> 8);
data[3] = (uchar_t)(*lp);
lp++;
data += 4;
structure = (void *)lp;
if (multiplier) {
multiplier--;
}
if (multiplier == 0) {
format++;
}
} else if (fmt == 'L') {
uint64_t *llp = (uint64_t *)structure;
/*
* account for possible hole in structure
* due to unaligned data
*/
llp = (uint64_t *)
(((uintptr_t)llp + _LONG_LONG_ALIGNMENT - 1) &
~(_LONG_LONG_ALIGNMENT - 1));
if (((data + 8) > dataend) ||
((llp + 1) > (uint64_t *)structend))
break;
/* do an endian-independent copy */
data[0] = (uchar_t)(*llp >> 56);
data[1] = (uchar_t)(*llp >> 48);
data[2] = (uchar_t)(*llp >> 40);
data[3] = (uchar_t)(*llp >> 32);
data[4] = (uchar_t)(*llp >> 24);
data[5] = (uchar_t)(*llp >> 16);
data[6] = (uchar_t)(*llp >> 8);
data[7] = (uchar_t)(*llp);
llp++;
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;
}
}
}