forked from len0rd/rockbox
9e93796407
These operations can only be used in limited circumstances and have exactly one user. bufgettail especially seems of dubious value; how often do you need to read N bytes from the end of a file without changing the file position? strip_tags() was the only function using them, to strip off ID3v1 and APE tags off the end of buffered tracks. This would save only 32-192 bytes per track -- if the container format uses APE/ID3v1. It hardly seems worth the effort. Change-Id: I8fc3c1408517eda6126e75e76d76daea904b50eb
126 lines
4.4 KiB
C
126 lines
4.4 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2007 Nicolas Pennequin
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef _BUFFERING_H_
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#define _BUFFERING_H_
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#include <sys/types.h>
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#include <stdbool.h>
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#include "config.h"
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#include "appevents.h"
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enum data_type {
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TYPE_UNKNOWN = 0, /* invalid type indicator */
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TYPE_ID3,
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TYPE_CODEC,
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TYPE_PACKET_AUDIO,
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TYPE_ATOMIC_AUDIO,
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TYPE_CUESHEET,
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TYPE_BITMAP,
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TYPE_RAW_ATOMIC,
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};
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/* Error return values */
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#define ERR_HANDLE_NOT_FOUND -1
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#define ERR_BUFFER_FULL -2
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#define ERR_INVALID_VALUE -3
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#define ERR_FILE_ERROR -4
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#define ERR_HANDLE_NOT_DONE -5
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#define ERR_UNSUPPORTED_TYPE -6
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#define ERR_BITMAP_TOO_LARGE -7
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/* Initialise the buffering subsystem */
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void buffering_init(void) INIT_ATTR;
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/* Reset the buffering system */
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bool buffering_reset(char *buf, size_t buflen);
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/***************************************************************************
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* MAIN BUFFERING API CALLS
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* ========================
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*
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* bufopen : Reserve space in the buffer for a given file
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* bufalloc : Open a new handle from data that needs to be copied from memory
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* bufclose : Close an open handle
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* bufseek : Set handle reading index, relatively to the start of the file
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* bufadvance: Move handle reading index, relatively to current position
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* bufftell : Return the handle's file read position
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* bufread : Copy data from a handle to a buffer
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* bufgetdata: Obtain a pointer for linear access to a "size" amount of data
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*
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* NOTE: bufread and bufgetdata will block the caller until the requested
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* amount of data is ready (unless EOF is reached).
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* NOTE: Tail operations are only legal when the end of the file is buffered.
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****************************************************************************/
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int bufopen(const char *file, off_t offset, enum data_type type,
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void *user_data);
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int bufalloc(const void *src, size_t size, enum data_type type);
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bool bufclose(int handle_id);
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int bufseek(int handle_id, size_t newpos);
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int bufadvance(int handle_id, off_t offset);
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off_t bufftell(int handle_id);
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ssize_t bufread(int handle_id, size_t size, void *dest);
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ssize_t bufgetdata(int handle_id, size_t size, void **data);
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/***************************************************************************
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* SECONDARY FUNCTIONS
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* ===================
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*
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* buf_handle_data_type: return the handle's data type
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* buf_is_handle: is the handle valid?
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* buf_pin_handle: Disallow/allow handle movement. Handle may still be removed.
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* buf_handle_offset: Get the offset of the first buffered byte from the file
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* buf_set_base_handle: Tell the buffering thread which handle is currently read
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* buf_length: Total size of ringbuffer
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* buf_used: Total amount of buffer space used (including allocated space)
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* buf_back_off_storage: tell buffering thread to take it easy
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****************************************************************************/
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bool buf_is_handle(int handle_id);
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int buf_handle_data_type(int handle_id);
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off_t buf_filesize(int handle_id);
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off_t buf_handle_offset(int handle_id);
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off_t buf_handle_remaining(int handle_id);
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bool buf_pin_handle(int handle_id, bool pin);
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bool buf_signal_handle(int handle_id, bool signal);
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size_t buf_length(void);
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size_t buf_used(void);
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/* Settings */
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void buf_set_base_handle(int handle_id);
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void buf_set_watermark(size_t bytes);
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size_t buf_get_watermark(void);
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/* Debugging */
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struct buffering_debug {
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int num_handles;
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size_t buffered_data;
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size_t data_rem;
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size_t useful_data;
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size_t watermark;
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};
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void buffering_get_debugdata(struct buffering_debug *dbgdata);
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#endif
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