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/*
* Physical->logical button mapping
*
* Copyright (C) 2010 Michael Buesch <mb@bu3sch.de>
*
* 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.
*/
#include "buttonmapping.h"
#include <string.h>
#include <errno.h>
int razer_create_buttonmap(void *buffer, size_t bufsize,
struct razer_buttonmapping *mappings, size_t nr_mappings,
unsigned int struct_spacing)
{
uint8_t *buf = buffer;
struct razer_buttonmapping *mapping;
size_t i, bufptr = 0;
for (i = 0; i < nr_mappings; i++) {
mapping = &mappings[i];
if (bufptr + sizeof(*mapping) >= bufsize) {
razer_error("razer_create_buttonmap: Buffer overflow\n");
return -ENOSPC;
}
memcpy(buf + bufptr, mapping, sizeof(*mapping));
bufptr += sizeof(*mapping);
bufptr += struct_spacing;
}
return 0;
}
int razer_parse_buttonmap(void *rawdata, size_t rawsize,
struct razer_buttonmapping *mappings, size_t nr_mappings,
unsigned int struct_spacing)
{
uint8_t *raw = rawdata;
size_t i, rawptr = 0, count;
struct razer_buttonmapping *mapping, *target;
for (i = 0; i < nr_mappings; i++)
mappings[i].logical = 0;
for (count = 0; count < nr_mappings; count++) {
if (rawptr + sizeof(*mapping) >= rawsize) {
razer_error("razer_parse_buttonmap: Raw data does not "
"contain all mappings\n");
return -EINVAL;
}
mapping = (struct razer_buttonmapping *)&raw[rawptr];
target = NULL;
for (i = 0; i < nr_mappings; i++) {
if (mappings[i].physical == mapping->physical) {
target = &mappings[i];
break;
}
}
if (!target) {
razer_error("razer_parse_buttonmap: Got physical mapping 0x%02X, "
"but that is not in the map\n", mapping->physical);
return -EINVAL;
}
target->logical = mapping->logical; /* Assign the mapping */
rawptr += sizeof(*mapping);
if (!razer_buffer_is_all_zero(&raw[rawptr],
min(struct_spacing, rawsize - rawptr))) {
razer_error("razer_parse_buttonmap: Buttonmap spacing contains "
"nonzero data\n");
return -EINVAL;
}
rawptr += struct_spacing;
}
for (i = 0; i < nr_mappings; i++) {
mapping = &mappings[i];
if (mapping->logical == 0) {
razer_error("razer_parse_buttonmap: Logical mapping for 0x%02X "
"was not found or is invalid\n", mapping->physical);
return -EINVAL;
}
}
return 0;
}
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