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515 lines
16 KiB
C
515 lines
16 KiB
C
//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// FAT16/32 File IO Library
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// V2.6
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// Ultra-Embedded.com
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// Copyright 2003 - 2012
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//
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// Email: admin@ultra-embedded.com
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//
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// License: GPL
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// If you would like a version with a more permissive license for use in
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// closed source commercial applications please contact me for details.
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//-----------------------------------------------------------------------------
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//
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// This file is part of FAT File IO Library.
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//
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// FAT File IO Library 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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// FAT File IO Library 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
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// along with FAT File IO Library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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#include <string.h>
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#include <assert.h>
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#include "fat_string.h"
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//-----------------------------------------------------------------------------
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// fatfs_total_path_levels: Take a filename and path and count the sub levels
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// of folders. E.g. C:\folder\file.zip = 1 level
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// Acceptable input formats are:
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// c:\folder\file.zip
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// /dev/etc/samba.conf
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// Returns: -1 = Error, 0 or more = Ok
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//-----------------------------------------------------------------------------
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int fatfs_total_path_levels(char *path)
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{
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int levels = 0;
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char expectedchar;
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if (!path)
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return -1;
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// Acceptable formats:
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// c:\folder\file.zip
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// /dev/etc/samba.conf
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if (*path == '/')
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{
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expectedchar = '/';
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path++;
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}
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else if (path[1] == ':' || path[2] == '\\')
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{
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expectedchar = '\\';
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path += 3;
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}
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else
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return -1;
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// Count levels in path string
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while (*path)
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{
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// Fast forward through actual subdir text to next slash
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for (; *path; )
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{
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// If slash detected escape from for loop
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if (*path == expectedchar) { path++; break; }
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path++;
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}
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// Increase number of subdirs founds
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levels++;
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}
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// Subtract the file itself
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return levels-1;
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}
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//-----------------------------------------------------------------------------
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// fatfs_get_substring: Get a substring from 'path' which contains the folder
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// (or file) at the specified level.
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// E.g. C:\folder\file.zip : Level 0 = C:\folder, Level 1 = file.zip
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// Returns: -1 = Error, 0 = Ok
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//-----------------------------------------------------------------------------
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int fatfs_get_substring(char *path, int levelreq, char *output, int max_len)
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{
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int i;
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int pathlen=0;
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int levels=0;
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int copypnt=0;
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char expectedchar;
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if (!path || max_len <= 0)
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return -1;
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// Acceptable formats:
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// c:\folder\file.zip
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// /dev/etc/samba.conf
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if (*path == '/')
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{
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expectedchar = '/';
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path++;
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}
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else if (path[1] == ':' || path[2] == '\\')
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{
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expectedchar = '\\';
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path += 3;
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}
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else
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return -1;
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// Get string length of path
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pathlen = (int)strlen (path);
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// Loop through the number of times as characters in 'path'
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for (i = 0; i<pathlen; i++)
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{
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// If a '\' is found then increase level
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if (*path == expectedchar) levels++;
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// If correct level and the character is not a '\' or '/' then copy text to 'output'
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if ( (levels == levelreq) && (*path != expectedchar) && (copypnt < (max_len-1)))
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output[copypnt++] = *path;
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// Increment through path string
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path++;
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}
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// Null Terminate
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output[copypnt] = '\0';
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// If a string was copied return 0 else return 1
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if (output[0] != '\0')
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return 0; // OK
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else
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return -1; // Error
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}
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//-----------------------------------------------------------------------------
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// fatfs_split_path: Full path contains the passed in string.
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// Returned is the path string and file Name string
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// E.g. C:\folder\file.zip -> path = C:\folder filename = file.zip
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// E.g. C:\file.zip -> path = [blank] filename = file.zip
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//-----------------------------------------------------------------------------
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int fatfs_split_path(char *full_path, char *path, int max_path, char *filename, int max_filename)
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{
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int strindex;
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// Count the levels to the filepath
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int levels = fatfs_total_path_levels(full_path);
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if (levels == -1)
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return -1;
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// Get filename part of string
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if (fatfs_get_substring(full_path, levels, filename, max_filename) != 0)
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return -1;
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// If root file
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if (levels == 0)
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path[0] = '\0';
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else
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{
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strindex = (int)strlen(full_path) - (int)strlen(filename);
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if (strindex > max_path)
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strindex = max_path;
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memcpy(path, full_path, strindex);
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path[strindex-1] = '\0';
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}
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return 0;
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}
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//-----------------------------------------------------------------------------
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// FileString_StrCmpNoCase: Compare two strings case with case sensitivity
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//-----------------------------------------------------------------------------
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static int FileString_StrCmpNoCase(char *s1, char *s2, int n)
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{
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int diff;
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char a,b;
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while (n--)
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{
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a = *s1;
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b = *s2;
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// Make lower case if uppercase
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if ((a>='A') && (a<='Z'))
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a+= 32;
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if ((b>='A') && (b<='Z'))
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b+= 32;
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diff = a - b;
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// If different
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if (diff)
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return diff;
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// If run out of strings
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if ( (*s1 == 0) || (*s2 == 0) )
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break;
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s1++;
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s2++;
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}
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return 0;
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}
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//-----------------------------------------------------------------------------
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// FileString_GetExtension: Get index to extension within filename
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// Returns -1 if not found or index otherwise
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//-----------------------------------------------------------------------------
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static int FileString_GetExtension(char *str)
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{
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int dotPos = -1;
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char *strSrc = str;
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// Find last '.' in string (if at all)
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while (*strSrc)
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{
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if (*strSrc=='.')
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dotPos = (int)(strSrc-str);
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strSrc++;
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}
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return dotPos;
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}
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//-----------------------------------------------------------------------------
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// FileString_TrimLength: Get length of string excluding trailing spaces
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// Returns -1 if not found or index otherwise
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//-----------------------------------------------------------------------------
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static int FileString_TrimLength(char *str, int strLen)
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{
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int length = strLen;
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char *strSrc = str+strLen-1;
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// Find last non white space
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while (strLen != 0)
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{
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if (*strSrc == ' ')
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length = (int)(strSrc - str);
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else
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break;
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strSrc--;
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strLen--;
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}
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return length;
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}
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//-----------------------------------------------------------------------------
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// fatfs_compare_names: Compare two filenames (without copying or changing origonals)
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// Returns 1 if match, 0 if not
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//-----------------------------------------------------------------------------
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int fatfs_compare_names(char* strA, char* strB)
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{
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char *ext1 = NULL;
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char *ext2 = NULL;
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int ext1Pos, ext2Pos;
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int file1Len, file2Len;
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// Get both files extension
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ext1Pos = FileString_GetExtension(strA);
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ext2Pos = FileString_GetExtension(strB);
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// NOTE: Extension position can be different for matching
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// filename if trailing space are present before it!
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// Check that if one has an extension, so does the other
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if ((ext1Pos==-1) && (ext2Pos!=-1))
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return 0;
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if ((ext2Pos==-1) && (ext1Pos!=-1))
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return 0;
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// If they both have extensions, compare them
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if (ext1Pos!=-1)
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{
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// Set pointer to start of extension
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ext1 = strA+ext1Pos+1;
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ext2 = strB+ext2Pos+1;
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// Verify that the file extension lengths match!
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if (strlen(ext1) != strlen(ext2))
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return 0;
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// If they dont match
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if (FileString_StrCmpNoCase(ext1, ext2, (int)strlen(ext1))!=0)
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return 0;
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// Filelength is upto extensions
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file1Len = ext1Pos;
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file2Len = ext2Pos;
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}
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// No extensions
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else
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{
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// Filelength is actual filelength
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file1Len = (int)strlen(strA);
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file2Len = (int)strlen(strB);
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}
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// Find length without trailing spaces (before ext)
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file1Len = FileString_TrimLength(strA, file1Len);
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file2Len = FileString_TrimLength(strB, file2Len);
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// Check the file lengths match
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if (file1Len!=file2Len)
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return 0;
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// Compare main part of filenames
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if (FileString_StrCmpNoCase(strA, strB, file1Len)!=0)
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return 0;
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else
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return 1;
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}
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//-----------------------------------------------------------------------------
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// fatfs_string_ends_with_slash: Does the string end with a slash (\ or /)
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//-----------------------------------------------------------------------------
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int fatfs_string_ends_with_slash(char *path)
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{
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if (path)
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{
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while (*path)
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{
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// Last character?
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if (!(*(path+1)))
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{
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if (*path == '\\' || *path == '/')
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return 1;
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}
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path++;
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}
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}
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return 0;
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}
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//-----------------------------------------------------------------------------
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// fatfs_get_sfn_display_name: Get display name for SFN entry
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//-----------------------------------------------------------------------------
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int fatfs_get_sfn_display_name(char* out, char* in)
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{
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int len = 0;
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while (*in && len <= 11)
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{
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char a = *in++;
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if (a == ' ')
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continue;
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// Make lower case if uppercase
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else if ((a>='A') && (a<='Z'))
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a+= 32;
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*out++ = a;
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len++;
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}
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*out = '\0';
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return 1;
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}
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//-----------------------------------------------------------------------------
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// fatfs_get_extension: Get extension of filename passed in 'filename'.
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// Returned extension is always lower case.
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// Returns: 1 if ok, 0 if not.
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//-----------------------------------------------------------------------------
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int fatfs_get_extension(char* filename, char* out, int maxlen)
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{
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int len = 0;
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// Get files extension offset
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int ext_pos = FileString_GetExtension(filename);
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if (ext_pos > 0 && out && maxlen)
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{
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filename += ext_pos + 1;
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while (*filename && len < (maxlen-1))
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{
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char a = *filename++;
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// Make lowercase if uppercase
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if ((a>='A') && (a<='Z'))
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a+= 32;
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*out++ = a;
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len++;
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}
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*out = '\0';
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return 1;
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}
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return 0;
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}
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//-----------------------------------------------------------------------------
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// fatfs_create_path_string: Append path & filename to create file path string.
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// Returns: 1 if ok, 0 if not.
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//-----------------------------------------------------------------------------
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int fatfs_create_path_string(char* path, char *filename, char* out, int maxlen)
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{
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int len = 0;
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char last = 0;
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char seperator = '/';
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if (path && filename && out && maxlen > 0)
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{
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while (*path && len < (maxlen-2))
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{
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last = *path++;
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if (last == '\\')
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seperator = '\\';
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*out++ = last;
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len++;
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}
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// Add a seperator if trailing one not found
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if (last != '\\' && last != '/')
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*out++ = seperator;
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while (*filename && len < (maxlen-1))
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{
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*out++ = *filename++;
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len++;
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}
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*out = '\0';
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return 1;
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}
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return 0;
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}
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//-----------------------------------------------------------------------------
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// Test Bench
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//-----------------------------------------------------------------------------
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#ifdef FAT_STRING_TESTBENCH
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void main(void)
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{
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char output[255];
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char output2[255];
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assert(fatfs_total_path_levels("C:\\folder\\file.zip") == 1);
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assert(fatfs_total_path_levels("C:\\file.zip") == 0);
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assert(fatfs_total_path_levels("C:\\folder\\folder2\\file.zip") == 2);
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assert(fatfs_total_path_levels("C:\\") == -1);
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assert(fatfs_total_path_levels("") == -1);
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assert(fatfs_total_path_levels("/dev/etc/file.zip") == 2);
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assert(fatfs_total_path_levels("/dev/file.zip") == 1);
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assert(fatfs_get_substring("C:\\folder\\file.zip", 0, output, sizeof(output)) == 0);
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assert(strcmp(output, "folder") == 0);
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assert(fatfs_get_substring("C:\\folder\\file.zip", 1, output, sizeof(output)) == 0);
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assert(strcmp(output, "file.zip") == 0);
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assert(fatfs_get_substring("/dev/etc/file.zip", 0, output, sizeof(output)) == 0);
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assert(strcmp(output, "dev") == 0);
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assert(fatfs_get_substring("/dev/etc/file.zip", 1, output, sizeof(output)) == 0);
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assert(strcmp(output, "etc") == 0);
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assert(fatfs_get_substring("/dev/etc/file.zip", 2, output, sizeof(output)) == 0);
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assert(strcmp(output, "file.zip") == 0);
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assert(fatfs_split_path("C:\\folder\\file.zip", output, sizeof(output), output2, sizeof(output2)) == 0);
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assert(strcmp(output, "C:\\folder") == 0);
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assert(strcmp(output2, "file.zip") == 0);
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assert(fatfs_split_path("C:\\file.zip", output, sizeof(output), output2, sizeof(output2)) == 0);
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assert(output[0] == 0);
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assert(strcmp(output2, "file.zip") == 0);
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assert(fatfs_split_path("/dev/etc/file.zip", output, sizeof(output), output2, sizeof(output2)) == 0);
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assert(strcmp(output, "/dev/etc") == 0);
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assert(strcmp(output2, "file.zip") == 0);
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assert(FileString_GetExtension("C:\\file.zip") == strlen("C:\\file"));
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assert(FileString_GetExtension("C:\\file.zip.ext") == strlen("C:\\file.zip"));
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assert(FileString_GetExtension("C:\\file.zip.") == strlen("C:\\file.zip"));
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assert(FileString_TrimLength("C:\\file.zip", strlen("C:\\file.zip")) == strlen("C:\\file.zip"));
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assert(FileString_TrimLength("C:\\file.zip ", strlen("C:\\file.zip ")) == strlen("C:\\file.zip"));
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assert(FileString_TrimLength(" ", strlen(" ")) == 0);
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assert(fatfs_compare_names("C:\\file.ext", "C:\\file.ext") == 1);
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assert(fatfs_compare_names("C:\\file2.ext", "C:\\file.ext") == 0);
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assert(fatfs_compare_names("C:\\file .ext", "C:\\file.ext") == 1);
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assert(fatfs_compare_names("C:\\file .ext", "C:\\file2.ext") == 0);
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assert(fatfs_string_ends_with_slash("C:\\folder") == 0);
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assert(fatfs_string_ends_with_slash("C:\\folder\\") == 1);
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assert(fatfs_string_ends_with_slash("/path") == 0);
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assert(fatfs_string_ends_with_slash("/path/a") == 0);
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assert(fatfs_string_ends_with_slash("/path/") == 1);
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assert(fatfs_get_extension("/mypath/file.wav", output, 4) == 1);
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assert(strcmp(output, "wav") == 0);
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assert(fatfs_get_extension("/mypath/file.WAV", output, 4) == 1);
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assert(strcmp(output, "wav") == 0);
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assert(fatfs_get_extension("/mypath/file.zip", output, 4) == 1);
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assert(strcmp(output, "ext") != 0);
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assert(fatfs_create_path_string("/mydir1", "myfile.txt", output, sizeof(output)) == 1);
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assert(strcmp(output, "/mydir1/myfile.txt") == 0);
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assert(fatfs_create_path_string("/mydir2/", "myfile2.txt", output, sizeof(output)) == 1);
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assert(strcmp(output, "/mydir2/myfile2.txt") == 0);
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assert(fatfs_create_path_string("C:\\mydir3", "myfile3.txt", output, sizeof(output)) == 1);
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assert(strcmp(output, "C:\\mydir3\\myfile3.txt") == 0);
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}
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#endif
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