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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <HTML><HEAD> <META NAME="GENERATOR" CONTENT="langdoc 1.0.1"> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <TITLE> file </TITLE> </HEAD> <BODY> <TABLE BORDER="1" WIDTH="100%" CELLPADDING="6"> <TR> <TD ALIGN=CENTER VALIGN=MIDDLE BGCOLOR=BLUE> <H1> <FONT COLOR="#FFFFFF"> file </FONT> </H1> </TD> </TR> </TABLE><P ALIGN=RIGHT> <I> Copyright (c) 2003</I> </P><H2> Library Usage </H2><H3> Package Description </H3><H3> Package Summary </H3><H4> Constants </H4><PRE></PRE><H4> Global Variables </H4><PRE></PRE><H4> Macros </H4><PRE></PRE><H4> Functions </H4><PRE><A HREF="#fat_calc_cluster">fat_calc_cluster</A> <A HREF="#fat_check_ext">fat_check_ext</A> <A HREF="#fat_check_ext">fat_check_ext</A> <A HREF="#fat_clear_dir_info">fat_clear_dir_info</A> <A HREF="#fat_clear_fat">fat_clear_fat</A> <A HREF="#fat_clear_fat">fat_clear_fat</A> <A HREF="#fat_clear_file_name">fat_clear_file_name</A> <A HREF="#fat_clear_file_name">fat_clear_file_name</A> <A HREF="#fat_dgetc">fat_dgetc</A> <A HREF="#fat_dgetc">fat_dgetc</A> <A HREF="#fat_dseek">fat_dseek</A> <A HREF="#fat_dseek">fat_dseek</A> <A HREF="#fat_fclose">fat_fclose</A> <A HREF="#fat_fclose">fat_fclose</A> <A HREF="#fat_fcreate">fat_fcreate</A> <A HREF="#fat_fcreate">fat_fcreate</A> <A HREF="#fat_fdelete">fat_fdelete</A> <A HREF="#fat_fdelete">fat_fdelete</A> <A HREF="#fat_feob">fat_feob</A> <A HREF="#fat_feob">fat_feob</A> <A HREF="#fat_feof">fat_feof</A> <A HREF="#fat_feof">fat_feof</A> <A HREF="#fat_fetch_file_info">fat_fetch_file_info</A> <A HREF="#fat_fgetc">fat_fgetc</A> <A HREF="#fat_fgetc">fat_fgetc</A> <A HREF="#fat_file_get_pos">fat_file_get_pos</A> <A HREF="#fat_file_get_pos">fat_file_get_pos</A> <A HREF="#fat_fopen">fat_fopen</A> <A HREF="#fat_fopen">fat_fopen</A> <A HREF="#fat_format">fat_format</A> <A HREF="#fat_format">fat_format</A> <A HREF="#fat_fputc">fat_fputc</A> <A HREF="#fat_fputc">fat_fputc</A> <A HREF="#fat_free_space">fat_free_space</A> <A HREF="#fat_fseek">fat_fseek</A> <A HREF="#fat_fseek">fat_fseek</A> <A HREF="#fat_fseek_abs">fat_fseek_abs</A> <A HREF="#fat_fseek_abs">fat_fseek_abs</A> <A HREF="#fat_get_clusters">fat_get_clusters</A> <A HREF="#fat_get_clusters">fat_get_clusters</A> <A HREF="#fat_get_dir_entry">fat_get_dir_entry</A> <A HREF="#fat_get_dir_file_list">fat_get_dir_file_list</A> <A HREF="#fat_get_dir_file_list">fat_get_dir_file_list</A> <A HREF="#fat_get_free_clusters">fat_get_free_clusters</A> <A HREF="#fat_get_name">fat_get_name</A> <A HREF="#fat_get_name">fat_get_name</A> <A HREF="#fat_get_root_directory">fat_get_root_directory</A> <A HREF="#fat_get_root_directory">fat_get_root_directory</A> <A HREF="#fat_goto_next">fat_goto_next</A> <A HREF="#fat_goto_next">fat_goto_next</A> <A HREF="#fat_goto_parentdir">fat_goto_parentdir</A> <A HREF="#fat_goto_parentdir">fat_goto_parentdir</A> <A HREF="#fat_goto_prev">fat_goto_prev</A> <A HREF="#fat_goto_prev">fat_goto_prev</A> <A HREF="#fat_goto_subdir">fat_goto_subdir</A> <A HREF="#fat_goto_subdir">fat_goto_subdir</A> <A HREF="#fat_install">fat_install</A> <A HREF="#fat_install">fat_install</A> <A HREF="#fat_install">fat_install</A> <A HREF="#fat_load_sector">fat_load_sector</A> <A HREF="#fat_read_cluster12">fat_read_cluster12</A> <A HREF="#fat_refresh_dir_file_info">fat_refresh_dir_file_info</A> <A HREF="#fat_refresh_dir_file_info">fat_refresh_dir_file_info</A> <A HREF="#fat_save_cluster_info">fat_save_cluster_info</A> <A HREF="#fat_save_cluster_info">fat_save_cluster_info</A> <A HREF="#fat_seek_entry_record">fat_seek_entry_record</A> <A HREF="#fat_seek_entry_record">fat_seek_entry_record</A> <A HREF="#fat_seek_first">fat_seek_first</A> <A HREF="#fat_seek_first">fat_seek_first</A> <A HREF="#fat_seek_last">fat_seek_last</A> <A HREF="#fat_seek_last">fat_seek_last</A> <A HREF="#fat_set_clusters">fat_set_clusters</A> <A HREF="#fat_up_down_load_sector">fat_up_down_load_sector</A> <A HREF="#fat_update_buf_fat">fat_update_buf_fat</A> <A HREF="#fat_update_entry_fat">fat_update_entry_fat</A> <A HREF="#fat_update_entry_fat">fat_update_entry_fat</A> <A HREF="#fat_update_fat_sector">fat_update_fat_sector</A> <A HREF="#fat_update_fat_sector">fat_update_fat_sector</A> <A HREF="#file_entry_dir">file_entry_dir</A> <A HREF="#file_seek_next">file_seek_next</A> <A HREF="#file_seek_prev">file_seek_prev</A> Hard_write_byte ( 0x01 ) ; <A HREF="#iso_check_ext">iso_check_ext</A> <A HREF="#iso_dgetw">iso_dgetw</A> <A HREF="#iso_dseek">iso_dseek</A> <A HREF="#iso_fclose">iso_fclose</A> <A HREF="#iso_feob">iso_feob</A> <A HREF="#iso_feof">iso_feof</A> <A HREF="#iso_fetch_directory_info">iso_fetch_directory_info</A> <A HREF="#iso_fgetc">iso_fgetc</A> <A HREF="#iso_file_get_pos">iso_file_get_pos</A> <A HREF="#iso_fopen">iso_fopen</A> <A HREF="#iso_fseek">iso_fseek</A> <A HREF="#iso_fseek_abs">iso_fseek_abs</A> <A HREF="#iso_get_directory">iso_get_directory</A> <A HREF="#iso_get_file_dir">iso_get_file_dir</A> <A HREF="#iso_get_name">iso_get_name</A> <A HREF="#iso_goto_first">iso_goto_first</A> <A HREF="#iso_goto_last">iso_goto_last</A> <A HREF="#iso_goto_next">iso_goto_next</A> <A HREF="#iso_goto_parent_dir">iso_goto_parent_dir</A> <A HREF="#iso_goto_prev">iso_goto_prev</A> <A HREF="#iso_read_volume_descriptor">iso_read_volume_descriptor</A> <A HREF="#iso_save_file_pos">iso_save_file_pos</A> </PRE><H3> Files List </H3><UL><LI><B><A NAME="fat.c"></A> fat.c</B><BR></LI><UL>FAT16/FAT12 file-system basics functions NOTES: Supports only the first partition Supports only 512 bytes sector size Supports only file fragmentation < MAX_FILE_FRAGMENT_NUMBER Supports only one file openned at a time Global Variables: - gl_buffer: array of bytes in pdata space</UL><LI><B><A NAME="fat.h"></A> fat.h</B><BR></LI><UL>FAT16/FAT12 file-system basic functions definition</UL><LI><B><A NAME="fat32.c"></A> fat32.c</B><BR></LI><UL>FAT32 file-system basics functions NOTES: Supports only the first partition Supports only 512 bytes sector size Supports only file fragmentation < MAX_FILE_FRAGMENT_NUMBER Supports only one file openned at a time Global Variables: - gl_buffer: array of bytes in pdata space</UL><LI><B><A NAME="fat32.h"></A> fat32.h</B><BR></LI><UL>FAT32 file-system basic functions definition</UL><LI><B><A NAME="file.c"></A> file.c</B><BR></LI><UL>This file contains extention routines to the file system</UL><LI><B><A NAME="file.h"></A> file.h</B><BR></LI><UL>This file contains the file function definition</UL><LI><B><A NAME="fs.h"></A> fs.h</B><BR></LI><UL>This file contains the system configuration definition</UL><LI><B><A NAME="fs_variable.c"></A> fs_variable.c</B><BR></LI><UL>File system variable definition NOTES: Arrangement : FAT12/16 only FAT32 only FAT32 and ISO 9660 FAT12/16 and ISO 9660 ?</UL><LI><B><A NAME="iso9660.c"></A> iso9660.c</B><BR></LI><UL>ISO9660 file-system basics functions NOTES: Some variables are shared with fat.c module : data Uint32 fat_ptr_data data Uint16 fat_fclust_byte_count idata Uint16 fat_dclust_byte_count idata Uint32 fat_dir_current_sect idata Uint16 fat_dir_list_index xdata char ext[] xdata Byte fat_buf_sector[] Global variable : pdata Byte gl_buffer[]</UL><LI><B><A NAME="iso9660.h"></A> iso9660.h</B><BR></LI><UL>ISO filesystem basic functions</UL><LI><B><A NAME="wav.h"></A> wav.h</B><BR></LI><UL>This file contains the wav file header definition WAVE FILE FORMAT ================ RIFF Chunk (12 bytes in length total) ------------------------------------- Byte Nb 0 - 3 "RIFF" (ASCII Characters) 4 - 7 Total Length Of Package To Follow (Binary, little endian) 8 - 11 "WAVE" (ASCII Characters) FORMAT Chunk (24 bytes in length total) --------------------------------------- Byte Nb 0 - 3 "fmt " (ASCII Characters) 4 - 7 Length Of FORMAT Chunk (Binary, always 0x10) 8 - 9 Always 0x01 10 - 11 Channel Numbers (Always 0x01=Mono, 0x02=Stereo) 12 - 15 Sample Rate (Binary, in Hz) 16 - 19 Bytes Per Second 20 - 21 Bytes Per Sample: 1= 8b Mono, 2= 8b Stereo or 16b Mono, 4= 16b Stereo 22 - 23 Bits Per Sample DATA Chunk ---------- Byte Nb 0 - 3 "data" (ASCII Characters) 4 - 7 Length Of Data To Follow 8 - end Data (Samples) EXAMPLE ------- 0000 52 49 46 46 46 2D 00 00-57 41 56 45 66 6D 74 20 RIFFF-..WAVEfmt 0010 10 00 00 00 01 00 01 00-22 56 00 00 22 56 00 00 ........"V.."V.. 0020 01 00 08 00 64 61 74 61-22 2D 00 00 80 80 80 80 ....data"-...... 0030 80 80 80 80 80 80 80 80-80 80 80 80 80 80 80 80 ................ 0040 80 80 80 80 80 80 80 80-80 80 80 80 80 80 80 80 ................ As expected, the file begins with the ASCII characters "RIFF" identifying it as a WAV file. The next four bytes tell us the length is 0x2D46 bytes (11590 bytes in decimal) which is the length of the entire file minus the 8 bytes for the "RIFF" and length (11598 - 11590 = 8 bytes). The ASCII characters for "WAVE" and "fmt " follow. Next (line 2 above) we find the value 0x00000010 in the first 4 bytes (length of format chunk: always constant at 0x10). The next four bytes are 0x0001 (Always) and 0x0001 (A mono WAV, one channel used). Since this is a 8-bit WAV, the sample rate and the bytes/second are the same at 0x00005622 or 22,050 in decimal. For a 16-bit stereo WAV the bytes/sec would be 4 times the sample rate. The next 2 bytes show the number of bytes per sample to be 0x0001 (8-bit mono) and the number of bits per sample to be 0x0008. Finally, the ASCII characters for "data" appear followed by 0x00002D22 (11,554 decimal) which is the number of bytes of data to follow (actual samples). The data is a value from 0x00 to 0xFF. In the example above 0x80 would represent "0" or silence on the output since the DAC used to playback samples is a bipolar device (i.e. a value of 0x00 would output a negative voltage and a value of 0xFF would output a positive voltage at the output of the DAC on the sound card)</UL></UL><H3> Included Files </H3><UL><LI><B>..\mem\hard.h" / * low level function definition * / </B><BR></LI><LI><B>config.h" / * system configuration * / </B><BR></LI><LI><B>config.h" / * system configuration * / </B><BR></LI><LI><B>fat.h" / * FAT file-system definition * / </B><BR></LI><LI><B>fat.h" / * fat file-system definition * / </B><BR></LI><LI><B>fat32.h" / * FAT file-system definition * / </B><BR></LI><LI><B>fat32.h" / * fat32 file-system definition * / </B><BR></LI><LI><B>file.h" / * file function definition * / </B><BR></LI><LI><B>file.h" / * file system definition * / </B><BR></LI><LI><B>fs.h" / * file system definition * / </B><BR></LI><LI><B>iso9660.h" / * ISO 9660 file-system definition * / </B><BR></LI><LI><B>iso9660.h" / * iso9660 file-system definition * / </B><BR></LI><LI><B>modules\display\disp_task.h" / * display definition * / </B><BR></LI></UL><H2> Types Description </H2><UL><LI><B><A NAME="data_struct"></A> data_struct</B><BR></LI><UL><PRE>struct{ /* DATA info */ char dat[4]; Uint32 data_length;} </PRE></UL><LI><B><A NAME="fat_st_cache"></A> fat_st_cache</B><BR></LI><UL><PRE>struct{ fat_st_dir_entry parent; /* parent directory */ fat_st_dir_entry current; /* current file/directory info */} </PRE></UL><LI><B><A NAME="fat_st_cache"></A> fat_st_cache</B><BR></LI><UL><PRE>struct{ fat_st_dir_entry parent; /* parent directory */ fat_st_dir_entry current; /* current file/directory info */} </PRE></UL><LI><B><A NAME="fat_st_clust_chain"></A> fat_st_clust_chain</B><BR></LI><UL><PRE>struct{ Uint32 cluster; /* starting cluster of fragment */ Uint16 number; /* number of subsequent clusters in fragment */} </PRE></UL><LI><B><A NAME="fat_st_clust_chain"></A> fat_st_clust_chain</B><BR></LI><UL><PRE>struct{ Uint32 cluster; /* starting cluster of fragment */ Uint16 number; /* number of subsequent clusters in fragment */} </PRE></UL><LI><B><A NAME="fat_st_dir_entry"></A> fat_st_dir_entry</B><BR></LI><UL><PRE>struct{ Byte attributes; /* Attributes bits */ /* Here could stand times variables, unused ... */ Uint32 start_cluster; /* Starting cluster number */ Union32 size; /* File size in bytes */} </PRE></UL><LI><B><A NAME="fat_st_dir_entry"></A> fat_st_dir_entry</B><BR></LI><UL><PRE>struct{ Byte attributes; /* Attributes bits */ /* Here could stand times variables, unused ... */ Uint32 start_cluster; /* Starting cluster number */ Union32 size; /* File size in bytes */} </PRE></UL><LI><B><A NAME="fat_st_free_space"></A> fat_st_free_space</B><BR></LI><UL><PRE>struct{ Uint32 free_cluster; /* number of free cluster */ Byte cluster_size; /* cluster size in sector */} </PRE></UL><LI><B><A NAME="fmt_struct"></A> fmt_struct</B><BR></LI><UL><PRE>struct{ /* FMT info */ char fmt[4]; Uint32 fmt_length; Uint16 wav_format; Uint16 channel_nb; Uint32 sample_rate; Uint32 bytes_per_second; Uint16 bytes_per_sample; Uint16 bits_per_sample;} </PRE></UL><LI><B><A NAME="iso_cache"></A> iso_cache</B><BR></LI><UL><PRE>struct{ iso_file info; iso_file parent;} </PRE></UL><LI><B><A NAME="iso_DirectoryRecord"></A> iso_DirectoryRecord</B><BR></LI><UL><PRE>struct{ Byte length; /* length of the record */ Uint32 extend_location; /* location of the extend */ Uint32 data_length; /* length of directory/file */} </PRE></UL><LI><B><A NAME="iso_file"></A> iso_file</B><BR></LI><UL><PRE>struct { Byte attributes; Uint32 extend_location; Uint32 extend_size; Uint16 entry_len;} </PRE></UL><LI><B><A NAME="iso_VolumeDescriptor"></A> iso_VolumeDescriptor</B><BR></LI><UL><PRE>struct { Uint16 logical_block_size; /* Size of the logical block usually 2048 bytes */ iso_DirectoryRecord root; /* root directory record */ Uint32 volume_size; /* volume size */} </PRE></UL><LI><B><A NAME="riff_struct"></A> riff_struct</B><BR></LI><UL><PRE>struct{ /* RIFF info */ char riff[4]; Uint32 pack_length; char wave[4];} </PRE></UL><LI><B><A NAME="wav_struct"></A> wav_struct</B><BR></LI><UL><PRE>struct{ riff_struct rif_info; fmt_struct fmt_info; data_struct dat_info;} </PRE></UL></UL><H2> Constant Macros </H2><H2> Global Variables </H2><H2> Function Macros </H2><H2> Functions </H2><A NAME="fat_calc_cluster"></A><H3> fat_calc_cluster </H3><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#D6E8FF" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_calc_cluster">fat_calc_cluster</A> ( void ) </PRE></TD></TABLE><P>Calculate fat_dir_current_sect and update directory variable from thevalue of fat_dir_current_offs.<P><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#FFD0D0" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE> *return:</PRE></TD></TABLE><H4> Note </H4><P><P><HR><A NAME="fat_check_ext"></A><H3> fat_check_ext </H3><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#D6E8FF" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE>Byte <A HREF="#fat_check_ext">fat_check_ext</A> ( void ) </PRE></TD></TABLE><P>Return the type of the file<P><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#FFD0D0" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE>*return:</PRE></TD></TABLE><HR><A NAME="fat_check_ext"></A><H3> fat_check_ext </H3><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#D6E8FF" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE>Byte <A HREF="#fat_check_ext">fat_check_ext</A> ( void ) </PRE></TD></TABLE><P>Return the type of the file<P><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#FFD0D0" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE>*return:</PRE></TD></TABLE><HR><A NAME="fat_clear_dir_info"></A><H3> fat_clear_dir_info </H3><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#D6E8FF" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_clear_dir_info">fat_clear_dir_info</A> ( void ) </PRE></TD></TABLE><P>Reset directory chain cluster value<P><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#FFD0D0" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE> *return:</PRE></TD></TABLE><H4> Note </H4><P><P><HR><A NAME="fat_clear_fat"></A><H3> fat_clear_fat </H3><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#D6E8FF" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_clear_fat">fat_clear_fat</A> ( Uint32 start_cluster ) </PRE></TD></TABLE><P>Reset FAT clusters value<P><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#FFD0D0" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE> return:</PRE></TD></TABLE><H4> Note </H4><P><P><HR><A NAME="fat_clear_fat"></A><H3> fat_clear_fat </H3><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#D6E8FF" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_clear_fat">fat_clear_fat</A> ( Uint32 start_cluster ) </PRE></TD></TABLE><P>Reset FAT clusters value<P><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#FFD0D0" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE> return:</PRE></TD></TABLE><H4> Note </H4><P><P><HR><A NAME="fat_clear_file_name"></A><H3> fat_clear_file_name </H3><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#D6E8FF" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_clear_file_name">fat_clear_file_name</A> ( void ) </PRE></TD></TABLE><P>Initialise the file name string<P><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#FFD0D0" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE>*return:</PRE></TD></TABLE><HR><A NAME="fat_clear_file_name"></A><H3> fat_clear_file_name </H3><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#D6E8FF" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE>void <A HREF="#fat_clear_file_name">fat_clear_file_name</A> ( void ) </PRE></TD></TABLE><P>Initialise the file name string<P><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#FFD0D0" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE>*return:</PRE></TD></TABLE><HR><A NAME="fat_dgetc"></A><H3> fat_dgetc </H3><TABLE BORDER="0" WIDTH="100 %" BGCOLOR="#D6E8FF" CELLPADDING="6"><TR> <TD VALIGN=MIDDLE><PRE>Byte <A HREF="#fat_dgetc">fat_dgetc</A> ( void ) </PRE></TD></TABLE><P>Return the directory data byte at the current position⌨️ 快捷键说明
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