ATMEL公司AT89C51SND1为主控制器MP3源代码

				/*H**************************************************************************
				* NAME:         iso9660.h         
				*----------------------------------------------------------------------------
				* Copyright (c) 2003 Atmel.
				*----------------------------------------------------------------------------
				* RELEASE:      snd1c-refd-nf-4_0_3      
				* REVISION:     1.3     
				*----------------------------------------------------------------------------
				* PURPOSE:
				* ISO filesystem basic functions
				*****************************************************************************/
				
				#ifndef _ISO9660_
				#define _ISO9660_
				
				
				#define TYPE_BOOT_RECORD              0x00
				#define TYPE_PRIMARY_VD               0x01
				#define TYPE_SUPPLEMENTARY_VD         0x02
				#define TYPE_PARTITION_VD             0x03
				#define TYPE_VOLUME_SET_TERMINATOR    0xFF
				
				#define ATTR_ISO_DIR                  0x02
				
				#define DEL_RET_OK                        (Byte)(0)
				#define DEL_RET_NO_MORE_FILE              (Byte)(1)
				#define DEL_RET_ERROR_DIR                 (Byte)(2)
				
				/* maximum number of LFN entries */
				#define MAX_LFN_ENTRIES   ((Byte)16)       
				/* maximum file name length      */
				#define MAX_FILENAME_LEN  ((Byte)(12 + (MAX_LFN_ENTRIES - 1) * 13 + 15 + 1 + 1))      
				#define MAX_DIRECTORY_FILE ((Uint16)512)    /* maximum number of file in    */
				
				
				/*******************************************************************************
				* PURPOSE: 
				* Directory Record Structure
				*******************************************************************************/
				typedef struct
				{
				  Byte length;            /* length of the record     */
				  Uint32 extend_location; /* location of the extend   */
				  Uint32 data_length;     /* length of directory/file */
				} iso_DirectoryRecord;
				
				/*******************************************************************************
				* PURPOSE:
				* Volume Descriptor Record Structure
				*******************************************************************************/
				typedef struct 
				{
				  Uint16 logical_block_size;  /* Size of the logical block usually 2048 bytes */
				  iso_DirectoryRecord root;   /* root directory record                        */
				  Uint32 volume_size;         /* volume size                                  */
				} iso_VolumeDescriptor;
				
				/*******************************************************************************
				* PURPOSE:
				* ISO cache of parent directory and current file or directory 
				*******************************************************************************/
				typedef struct 
				{
				  Byte attributes;
				  Uint32 extend_location;
				  Uint32 extend_size;
				  Uint16 entry_len;
				} iso_file;
				
				typedef struct
				{
				  iso_file info;
				  iso_file parent;
				} iso_cache;
				
				
				/*******************************************************************************
				* PURPOSE: 
				* ISO file system functions (fs/iso9660/iso9660.c)
				*******************************************************************************/
				bit     iso_install(void);
				bit     iso_read_volume_descriptor(Uint32);
				bit     iso_goto_first(void);
				bit     iso_goto_next(void);
				bit     iso_goto_prev(void);
				Byte    iso_check_ext(void);
				bit     iso_goto_subdir(void);
				bit     iso_goto_parent_dir(void);
				bit     iso_fopen(void);
				Byte    iso_fgetc(void);
				bit     iso_feof(void);
				bit     iso_feob(void);
				void    iso_fclose(void);
				char    pdata  *iso_get_name(void);
				bit     iso_fseek(Int16);
				Uint32  iso_file_get_pos (void);
				void    iso_save_file_pos (void);
				bit     iso_fseek_abs (Uint32 offset);
				bit     iso_get_directory(Byte,bit);   
				#define iso_goto_subdir(id)  iso_get_directory(id, FALSE) 
				bit     iso_goto_last (void);
				
				
				#endif /*_ISO9660_*/