8b903626c2
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142 lines
2.8 KiB
C++
142 lines
2.8 KiB
C++
/*
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* Copyright 2003-2016 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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#include "config.h"
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#include "FlacIOHandle.hxx"
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#include "util/Error.hxx"
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#include "Log.hxx"
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#include "Compiler.h"
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#include <errno.h>
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#include <stdio.h>
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static size_t
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FlacIORead(void *ptr, size_t size, size_t nmemb, FLAC__IOHandle handle)
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{
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InputStream *is = (InputStream *)handle;
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uint8_t *const p0 = (uint8_t *)ptr, *p = p0,
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*const end = p0 + size * nmemb;
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/* libFLAC is very picky about short reads, and expects the IO
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callback to fill the whole buffer (undocumented!) */
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Error error;
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while (p < end) {
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size_t nbytes = is->LockRead(p, end - p, error);
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if (nbytes == 0) {
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if (!error.IsDefined())
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/* end of file */
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break;
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if (error.IsDomain(errno_domain))
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errno = error.GetCode();
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else
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/* just some random non-zero
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errno value */
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errno = EINVAL;
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return 0;
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}
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p += nbytes;
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}
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/* libFLAC expects a clean errno after returning from the IO
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callbacks (undocumented!) */
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errno = 0;
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return (p - p0) / size;
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}
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static int
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FlacIOSeek(FLAC__IOHandle handle, FLAC__int64 _offset, int whence)
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{
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InputStream *is = (InputStream *)handle;
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offset_type offset = _offset;
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switch (whence) {
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case SEEK_SET:
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break;
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case SEEK_CUR:
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offset += is->GetOffset();
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break;
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case SEEK_END:
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if (!is->KnownSize())
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return -1;
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offset += is->GetSize();
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break;
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default:
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return -1;
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}
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Error error;
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if (!is->LockSeek(offset, error)) {
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LogError(error);
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return -1;
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}
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return 0;
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}
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static FLAC__int64
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FlacIOTell(FLAC__IOHandle handle)
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{
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InputStream *is = (InputStream *)handle;
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return is->GetOffset();
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}
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static int
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FlacIOEof(FLAC__IOHandle handle)
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{
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InputStream *is = (InputStream *)handle;
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return is->LockIsEOF();
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}
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static int
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FlacIOClose(gcc_unused FLAC__IOHandle handle)
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{
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/* no-op because the libFLAC caller is repsonsible for closing
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the #InputStream */
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return 0;
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}
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const FLAC__IOCallbacks flac_io_callbacks = {
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FlacIORead,
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nullptr,
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nullptr,
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nullptr,
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FlacIOEof,
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FlacIOClose,
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};
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const FLAC__IOCallbacks flac_io_callbacks_seekable = {
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FlacIORead,
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nullptr,
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FlacIOSeek,
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FlacIOTell,
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FlacIOEof,
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FlacIOClose,
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};
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