File size: 5,298 Bytes
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Copyright(c) 2016 Cedric Jimenez
This file is part of lw-mqtt.
lw-mqtt is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
lw-mqtt 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with lw-mqtt. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mqtt_error.h"
#include "buffer_stream.h"
/** \brief Input stream reset function */
static bool buffer_stream_reset_input(input_stream_t* const stream, const size_t new_size);
/** \brief Input stream reader function */
static bool buffer_stream_reader(input_stream_t* const stream, void* data, const size_t size);
/** \brief Output stream reset function */
static bool buffer_stream_reset_output(output_stream_t* const stream);
/** \brief Output stream writer function */
static bool buffer_stream_writer(output_stream_t* const stream, const void* data, const size_t size);
/** \brief Initialize an input stream from a buffer */
bool buffer_stream_input_from_buffer(input_stream_t* const stream, uint8_t buffer[], const size_t size)
{
bool ret = false;
/* Check params */
if ((stream != NULL) &&
(buffer != NULL))
{
/* Init input stream */
stream->reset = buffer_stream_reset_input;
stream->reader = buffer_stream_reader;
stream->size = size;
stream->read = 0u;
stream->param = buffer;
ret = true;
}
else
{
/* Error */
mqtt_errno_set(MQTT_ERR_INVALID_PARAM);
}
return ret;
}
/** \brief Initialize an output stream from a buffer */
bool buffer_stream_output_from_buffer(output_stream_t* const stream, uint8_t buffer[], const size_t size)
{
bool ret = false;
/* Check params */
if ((stream != NULL) &&
(buffer != NULL))
{
/* Init output stream */
stream->reset = buffer_stream_reset_output;
stream->writer = buffer_stream_writer;
stream->size = size;
stream->written = 0u;
stream->param = buffer;
ret = true;
}
else
{
/* Error */
mqtt_errno_set(MQTT_ERR_INVALID_PARAM);
}
return ret;
}
/** \brief Input stream reset function */
static bool buffer_stream_reset_input(input_stream_t* const stream, const size_t new_size)
{
bool ret = false;
/* Check params */
if ((stream != NULL) &&
(stream->param != NULL))
{
/* Reset stream */
stream->param = (void*)((intptr_t)stream->param - (intptr_t)stream->read);
stream->size = new_size;
stream->read = 0u;
ret = true;
}
else
{
/* Error */
mqtt_errno_set(MQTT_ERR_INVALID_PARAM);
}
return ret;
}
/** \brief Input stream reader function */
static bool buffer_stream_reader(input_stream_t* const stream, void* data, const size_t size)
{
bool ret = false;
/* No null-pointer test for the parameters because this function
is meant to be called from the inside of the library where the
parameters are already checked.
*/
/* Check size left into stream */
if (stream->read + size <= stream->size)
{
/* Copy data into the buffer */
memcpy(data, stream->param, size);
stream->read += size;
stream->param = (void*)((intptr_t)stream->param + (intptr_t)size);
ret = true;
}
else
{
mqtt_errno_set(MQTT_ERR_INPUT_STREAM_EMPTY);
}
return ret;
}
/** \brief Output stream reset function */
static bool buffer_stream_reset_output(output_stream_t* const stream)
{
bool ret = false;
/* Check params */
if ((stream != NULL) &&
(stream->param != NULL))
{
/* Reset stream */
stream->param = (void*)((intptr_t)stream->param - (intptr_t)stream->written);
stream->written = 0u;
ret = true;
}
else
{
/* Error */
mqtt_errno_set(MQTT_ERR_INVALID_PARAM);
}
return ret;
}
/** \brief Output stream writer function */
static bool buffer_stream_writer(output_stream_t* const stream, const void* data, const size_t size)
{
bool ret = false;
/* No null-pointer test for the parameters because this function
is meant to be called from the inside of the library where the
parameters are already checked.
*/
/* Check size left into buffer */
if (stream->written + size <= stream->size)
{
/* Copy data into the stream buffer */
memcpy(stream->param, data, size);
stream->written += size;
stream->param = (void*)((intptr_t)stream->param + (intptr_t)size);
ret = true;
}
else
{
mqtt_errno_set(MQTT_ERR_OUTPUT_STREAM_FULL);
}
return ret;
}
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