113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
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/*
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* Copyright (C) 2012 The Music Player Daemon Project
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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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*
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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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*/
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/* \file
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*
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* This file contains functions used by the DSF and DSDIFF decoders.
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*
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*/
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#include "config.h"
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#include "dsf_decoder_plugin.h"
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#include "decoder_api.h"
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#include "util/bit_reverse.h"
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#include "dsdlib.h"
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#include "dsdiff_decoder_plugin.h"
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#include <unistd.h>
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#include <stdio.h> /* for SEEK_SET, SEEK_CUR */
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bool
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dsdlib_id_equals(const struct dsdlib_id *id, const char *s)
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{
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assert(id != NULL);
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assert(s != NULL);
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assert(strlen(s) == sizeof(id->value));
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return memcmp(id->value, s, sizeof(id->value)) == 0;
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}
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bool
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dsdlib_read(struct decoder *decoder, struct input_stream *is,
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void *data, size_t length)
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{
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size_t nbytes = decoder_read(decoder, is, data, length);
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return nbytes == length;
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}
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/**
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* Skip the #input_stream to the specified offset.
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*/
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bool
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dsdlib_skip_to(struct decoder *decoder, struct input_stream *is,
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goffset offset)
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{
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if (is->seekable)
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return input_stream_seek(is, offset, SEEK_SET, NULL);
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if (is->offset > offset)
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return false;
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char buffer[8192];
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while (is->offset < offset) {
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size_t length = sizeof(buffer);
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if (offset - is->offset < (goffset)length)
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length = offset - is->offset;
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size_t nbytes = decoder_read(decoder, is, buffer, length);
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if (nbytes == 0)
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return false;
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}
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assert(is->offset == offset);
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return true;
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}
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/**
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* Skip some bytes from the #input_stream.
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*/
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bool
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dsdlib_skip(struct decoder *decoder, struct input_stream *is,
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goffset delta)
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{
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assert(delta >= 0);
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if (delta == 0)
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return true;
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if (is->seekable)
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return input_stream_seek(is, delta, SEEK_CUR, NULL);
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char buffer[8192];
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while (delta > 0) {
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size_t length = sizeof(buffer);
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if ((goffset)length > delta)
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length = delta;
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size_t nbytes = decoder_read(decoder, is, buffer, length);
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if (nbytes == 0)
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return false;
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delta -= nbytes;
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}
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return true;
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}
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