mirror of https://github.com/LeOS-GSI/LeOS-Genesis
145 lines
3.9 KiB
C
145 lines
3.9 KiB
C
/**
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* @file SimpleStreamBuffer.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <string.h>
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#include <stddef.h>
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#include <misc/balloc.h>
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#include <misc/minmax.h>
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#include "SimpleStreamBuffer.h"
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static void try_output (SimpleStreamBuffer *o)
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{
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ASSERT(o->output_data_len > 0)
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// calculate number of bytes to output
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int bytes = bmin_int(o->output_data_len, o->buf_used);
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if (bytes == 0) {
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return;
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}
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// copy bytes to output
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memcpy(o->output_data, o->buf, bytes);
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// shift buffer
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memmove(o->buf, o->buf + bytes, o->buf_used - bytes);
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o->buf_used -= bytes;
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// forget data
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o->output_data_len = -1;
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// done
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StreamRecvInterface_Done(&o->output, bytes);
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}
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static void output_handler_recv (SimpleStreamBuffer *o, uint8_t *data, int data_len)
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{
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DebugObject_Access(&o->d_obj);
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ASSERT(o->output_data_len == -1)
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ASSERT(data)
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ASSERT(data_len > 0)
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// remember data
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o->output_data = data;
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o->output_data_len = data_len;
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try_output(o);
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}
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int SimpleStreamBuffer_Init (SimpleStreamBuffer *o, int buf_size, BPendingGroup *pg)
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{
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ASSERT(buf_size > 0)
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// init arguments
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o->buf_size = buf_size;
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// init output
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StreamRecvInterface_Init(&o->output, (StreamRecvInterface_handler_recv)output_handler_recv, o, pg);
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// allocate buffer
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if (!(o->buf = (uint8_t *)BAlloc(buf_size))) {
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goto fail1;
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}
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// init buffer state
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o->buf_used = 0;
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// set no output data
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o->output_data_len = -1;
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DebugObject_Init(&o->d_obj);
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return 1;
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fail1:
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StreamRecvInterface_Free(&o->output);
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return 0;
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}
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void SimpleStreamBuffer_Free (SimpleStreamBuffer *o)
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{
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DebugObject_Free(&o->d_obj);
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// free buffer
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BFree(o->buf);
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// free output
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StreamRecvInterface_Free(&o->output);
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}
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StreamRecvInterface * SimpleStreamBuffer_GetOutput (SimpleStreamBuffer *o)
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{
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DebugObject_Access(&o->d_obj);
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return &o->output;
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}
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int SimpleStreamBuffer_Write (SimpleStreamBuffer *o, uint8_t *data, int data_len)
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{
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DebugObject_Access(&o->d_obj);
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ASSERT(data_len >= 0)
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if (data_len > o->buf_size - o->buf_used) {
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return 0;
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}
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// copy to buffer
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memcpy(o->buf + o->buf_used, data, data_len);
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// update buffer state
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o->buf_used += data_len;
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// continue outputting
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if (o->output_data_len > 0) {
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try_output(o);
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}
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return 1;
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}
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