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////////////////////////////////////////////////////////////////////////////////
///
/// @file vpd.c
///
/// @project
///
/// @brief VPD Support Routines
///
////////////////////////////////////////////////////////////////////////////////
///
////////////////////////////////////////////////////////////////////////////////
///
/// @copyright Copyright (c) 2018, Evan Lojewski
/// @cond
///
/// All rights reserved.
///
/// Redistribution and use in source and binary forms, with or without
/// modification, are permitted provided that the following conditions are met:
/// 1. Redistributions of source code must retain the above copyright notice,
/// this list of conditions and the following disclaimer.
/// 2. Redistributions in binary form must reproduce the above copyright notice,
/// this list of conditions and the following disclaimer in the documentation
/// and/or other materials provided with the distribution.
/// 3. Neither the name of the copyright holder nor the
/// names of its contributors may be used to endorse or promote products
/// derived from this software without specific prior written permission.
///
////////////////////////////////////////////////////////////////////////////////
///
/// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
/// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
/// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
/// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
/// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
/// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
/// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
/// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
/// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
/// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
/// POSSIBILITY OF SUCH DAMAGE.
/// @endcond
////////////////////////////////////////////////////////////////////////////////
#ifdef CXX_SIMULATOR
#include <stdio.h>
#endif /* CXX_SIMULATOR */
#include <stdlib.h>
#include <string.h>
#include <vpd.h>
typedef struct
{
const char *name;
const char *string;
} vpd_name_entry_t;
vpd_name_entry_t mNames[] = {
{.name = VPD_PRODUCT_NAME, .string = "Product Name"},
{.name = VPD_ENGINEERING_CHANGE, .string = "Engineering Change"},
{.name = VPD_SERIAL_NUMBER, .string = "Serial Number"},
{.name = VPD_MANUFACTURING_ID, .string = "Manufacturer ID"},
{.name = VPD_CHECKSUM, .string = "Checksum"},
};
bool vpd_is_checksum(uint16_t field)
{
if (0 == strncmp(VPD_CHECKSUM, (const char *)&field, 2))
{
return true;
}
return false;
}
const char *vpd_get_field_name(uint16_t field)
{
for (int i = 0; i < sizeof(mNames) / sizeof(mNames[0]); i++)
{
if (0 == strncmp(mNames[i].name, (const char *)&field, 2))
{
return mNames[i].string;
}
}
#ifdef CXX_SIMULATOR
printf("Unknown %c%c\n", field, field >> 8);
#endif
return NULL;
}
static uint8_t *get_next_tag(uint8_t *buffer, size_t *len)
{
if (!len)
{
return NULL;
}
uint16_t tag_len = 0;
vpd_resource_typet_t b0 = {.data = buffer[0]};
if (VPD_DATA_TYPE_LARGE == b0.large.type)
{
tag_len = 3;
tag_len += buffer[1] | buffer[2] << 8;
}
else
{
tag_len = 1;
tag_len += b0.small.bytes;
}
*len -= tag_len;
return &buffer[tag_len];
}
static uint8_t *get_tag_data(uint8_t *buffer, size_t *len)
{
if (!len)
{
return NULL;
}
vpd_resource_typet_t b0 = {.data = buffer[0]};
if (VPD_DATA_TYPE_LARGE == b0.large.type)
{
*len = buffer[1] | buffer[2] << 8;
return &buffer[3];
}
else
{
*len = b0.small.bytes;
return &buffer[1];
}
}
uint8_t *vpd_get_resource_by_name(uint8_t *buffer, size_t *len, uint16_t type)
{
return NULL;
}
uint8_t *vpd_get_resource_by_index(uint8_t *buffer, size_t *len, uint16_t *name,
size_t index)
{
index++;
size_t new_len = *len;
uint8_t *new_buf = get_next_tag(buffer, &new_len);
new_buf = get_tag_data(new_buf, &new_len);
vpd_field_t *field;
do
{
field = (vpd_field_t *)new_buf;
char *data = (char *)malloc(field->length + 1);
memcpy(data, &field->data, field->length);
data[field->length] = 0;
new_buf += field->length;
new_buf += 3;
index--;
if (index && vpd_is_checksum(field->name))
{
// last entry found, but we requested more.
return NULL;
}
} while (index);
*name = field->name;
*len = field->length;
return &field->data;
}
bool vpd_set_resource(uint8_t *buffer, size_t len, uint16_t resource,
uint8_t *add_data, size_t add_len)
{
return false;
}
bool vpd_is_valid(uint8_t *buffer, size_t len)
{
if (!len)
{
return false;
}
if (!vpd_get_identifier(buffer, &len))
{
return false;
}
// TODO: check checksum.
return len != 0;
}
uint8_t *vpd_get_identifier(uint8_t *buffer, size_t *len)
{
if (!len)
return NULL;
return get_tag_data(buffer, len);
}
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