2009-02-17 22:39:45 +01:00
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/*
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2013-04-17 22:45:10 +02:00
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* Copyright (C) 2003-2013 The Music Player Daemon Project
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2009-02-17 22:39:45 +01:00
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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2009-03-13 18:43:16 +01:00
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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2009-02-17 22:39:45 +01:00
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*/
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2009-11-12 09:12:38 +01:00
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#include "config.h"
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2013-04-17 22:45:10 +02:00
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#include "DecoderBuffer.hxx"
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2013-07-28 13:18:48 +02:00
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#include "DecoderAPI.hxx"
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2014-01-06 21:38:25 +01:00
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#include "util/ConstBuffer.hxx"
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2009-02-17 22:39:45 +01:00
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#include <glib.h>
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#include <assert.h>
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2013-07-30 20:11:57 +02:00
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#include <string.h>
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2009-02-17 22:39:45 +01:00
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2013-04-17 22:45:10 +02:00
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struct DecoderBuffer {
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2013-10-21 21:12:37 +02:00
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Decoder *decoder;
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2013-10-23 22:08:59 +02:00
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InputStream *is;
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2009-02-17 22:39:45 +01:00
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/** the allocated size of the buffer */
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size_t size;
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/** the current length of the buffer */
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size_t length;
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/** number of bytes already consumed at the beginning of the
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buffer */
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size_t consumed;
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/** the actual buffer (dynamic size) */
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unsigned char data[sizeof(size_t)];
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};
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DecoderBuffer *
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decoder_buffer_new(Decoder *decoder, InputStream &is,
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size_t size)
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{
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DecoderBuffer *buffer = (DecoderBuffer *)
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g_malloc(sizeof(*buffer) - sizeof(buffer->data) + size);
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assert(size > 0);
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buffer->decoder = decoder;
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buffer->is = &is;
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2009-02-17 22:39:45 +01:00
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buffer->size = size;
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buffer->length = 0;
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buffer->consumed = 0;
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return buffer;
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}
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void
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decoder_buffer_free(DecoderBuffer *buffer)
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{
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assert(buffer != nullptr);
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g_free(buffer);
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}
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bool
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decoder_buffer_is_empty(const DecoderBuffer *buffer)
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{
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return buffer->consumed == buffer->length;
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}
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bool
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decoder_buffer_is_full(const DecoderBuffer *buffer)
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{
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return buffer->consumed == 0 && buffer->length == buffer->size;
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}
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2014-01-06 21:46:10 +01:00
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void
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decoder_buffer_clear(DecoderBuffer *buffer)
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{
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buffer->length = buffer->consumed = 0;
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}
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static void
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decoder_buffer_shift(DecoderBuffer *buffer)
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2009-02-17 22:39:45 +01:00
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{
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assert(buffer->consumed > 0);
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buffer->length -= buffer->consumed;
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memmove(buffer->data, buffer->data + buffer->consumed, buffer->length);
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buffer->consumed = 0;
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}
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bool
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decoder_buffer_fill(DecoderBuffer *buffer)
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{
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size_t nbytes;
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if (buffer->consumed > 0)
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decoder_buffer_shift(buffer);
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if (buffer->length >= buffer->size)
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/* buffer is full */
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return false;
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2013-10-23 22:08:59 +02:00
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nbytes = decoder_read(buffer->decoder, *buffer->is,
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buffer->data + buffer->length,
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buffer->size - buffer->length);
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if (nbytes == 0)
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/* end of file, I/O error or decoder command
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received */
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return false;
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buffer->length += nbytes;
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assert(buffer->length <= buffer->size);
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return true;
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}
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2014-01-06 21:38:25 +01:00
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ConstBuffer<void>
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decoder_buffer_read(const DecoderBuffer *buffer)
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2009-02-17 22:39:45 +01:00
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{
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2014-01-06 21:38:25 +01:00
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return {
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buffer->data + buffer->consumed,
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buffer->length - buffer->consumed
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};
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2009-02-17 22:39:45 +01:00
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}
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void
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decoder_buffer_consume(DecoderBuffer *buffer, size_t nbytes)
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2009-02-17 22:39:45 +01:00
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{
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/* just move the "consumed" pointer - decoder_buffer_shift()
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will do the real work later (called by
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decoder_buffer_fill()) */
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buffer->consumed += nbytes;
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assert(buffer->consumed <= buffer->length);
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}
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2009-09-30 15:22:36 +02:00
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bool
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decoder_buffer_skip(DecoderBuffer *buffer, size_t nbytes)
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{
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bool success;
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/* this could probably be optimized by seeking */
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while (true) {
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2014-01-06 21:38:25 +01:00
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auto data = decoder_buffer_read(buffer);
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if (!data.IsEmpty()) {
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if (data.size > nbytes)
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data.size = nbytes;
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decoder_buffer_consume(buffer, data.size);
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nbytes -= data.size;
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2009-09-30 15:22:36 +02:00
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if (nbytes == 0)
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return true;
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}
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success = decoder_buffer_fill(buffer);
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if (!success)
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return false;
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}
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}
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