aiie/teensy/teensy-filemanager.cpp

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#include <Arduino.h>
#include <wchar.h>
#include "ff.h" // File System
#include "teensy-filemanager.h"
#include <string.h> // strcpy
// FIXME: globals are yucky.
DIR dir;
FILINFO fno;
FIL fil;
int8_t rawFd = -1;
FIL rawFil;
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static TCHAR *char2tchar( const char *charString, int nn, TCHAR *output)
{
int ii;
for (ii=0; ii<nn; ii++) {
output[ii] = (TCHAR)charString[ii];
if (!charString[ii])
break;
}
return output;
}
static char * tchar2char( const TCHAR * tcharString, int nn, char * charString)
{ int ii;
for(ii = 0; ii<nn; ii++)
{ charString[ii] = (char)tcharString[ii];
if(!charString[ii]) break;
}
return charString;
}
TeensyFileManager::TeensyFileManager()
{
numCached = 0;
}
TeensyFileManager::~TeensyFileManager()
{
}
int8_t TeensyFileManager::openFile(const char *name)
{
// invalidate the raw file cache
if (rawFd != -1) {
f_close(&rawFil);
rawFd = -1;
}
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// See if there's a hole to re-use...
for (int i=0; i<numCached; i++) {
if (cachedNames[i][0] == '\0') {
strncpy(cachedNames[i], name, MAXPATH-1);
cachedNames[i][MAXPATH-1] = '\0'; // safety: ensure string terminator
fileSeekPositions[i] = 0;
return i;
}
}
// check for too many open files
if (numCached >= MAXFILES)
return -1;
// No, so we'll add it to the end
strncpy(cachedNames[numCached], name, MAXPATH-1);
cachedNames[numCached][MAXPATH-1] = '\0'; // safety: ensure string terminator
fileSeekPositions[numCached] = 0;
numCached++;
return numCached-1;
}
void TeensyFileManager::closeFile(int8_t fd)
{
// invalidate the raw file cache
if (rawFd != -1) {
f_close(&rawFil);
rawFd = -1;
}
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// invalid fd provided?
if (fd < 0 || fd >= numCached)
return;
// clear the name
cachedNames[fd][0] = '\0';
}
const char *TeensyFileManager::fileName(int8_t fd)
{
if (fd < 0 || fd >= numCached)
return NULL;
return cachedNames[fd];
}
// suffix may be comma-separated
int8_t TeensyFileManager::readDir(const char *where, const char *suffix, char *outputFN, int8_t startIdx, uint16_t maxlen)
{
// ... open, read, save next name, close, return name. Horribly
// inefficient but hopefully won't break the sd layer. And if it
// works then we can make this more efficient later.
// First entry is always "../"
if (startIdx == 0) {
strcpy(outputFN, "../");
return 0;
}
int8_t idxCount = 1;
TCHAR buf[MAXPATH];
char2tchar(where, MAXPATH, buf);
buf[strlen(where)-1] = '\0'; // this library doesn't want trailing slashes
FRESULT rc = f_opendir(&dir, buf);
if (rc) {
Serial.printf("f_opendir '%s' failed: %d\n", where, rc);
return -1;
}
while (1) {
rc = f_readdir(&dir, &fno);
if (rc || !fno.fname[0]) {
// No more - all done.
f_closedir(&dir);
return -1;
}
if (fno.fname[0] == '.' || fno.fname[0] == '_' || fno.fname[0] == '~') {
// skip MAC fork files and any that have been deleted :/
continue;
}
// skip anything that has the wrong suffix
char fn[MAXPATH];
tchar2char(fno.fname, MAXPATH, fn);
if (suffix && !(fno.fattrib & AM_DIR) && strlen(fn) >= 3) {
const char *fsuff = &fn[strlen(fn)-3];
if (strstr(suffix, ",")) {
// multiple suffixes to check
bool matchesAny = false;
const char *p = suffix;
while (p && strlen(p)) {
if (!strncasecmp(fsuff, p, 3)) {
matchesAny = true;
break;
}
p = strstr(p, ",")+1;
}
if (!matchesAny)
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continue;
} else {
// one suffix to check
if (strcasecmp(fsuff, suffix))
continue;
}
}
if (idxCount == startIdx) {
if (fno.fattrib & AM_DIR) {
strcat(fn, "/");
}
strncpy(outputFN, fn, maxlen);
f_closedir(&dir);
return idxCount;
}
idxCount++;
}
/* NOTREACHED */
}
void TeensyFileManager::seekBlock(int8_t fd, uint16_t block, bool isNib)
{
if (fd < 0 || fd >= numCached)
return;
fileSeekPositions[fd] = block * (isNib ? 416 : 256);
}
bool TeensyFileManager::readTrack(int8_t fd, uint8_t *toWhere, bool isNib)
{
if (fd < 0 || fd >= numCached)
return false;
if (cachedNames[fd][0] == 0)
return false;
// open, seek, read, close.
TCHAR buf[MAXPATH];
char2tchar(cachedNames[fd], MAXPATH, buf);
FRESULT rc = f_open(&fil, (TCHAR*) buf, FA_READ);
if (rc) {
Serial.println("failed to open");
return false;
}
rc = f_lseek(&fil, fileSeekPositions[fd]);
if (rc) {
Serial.println("readTrack: seek failed");
f_close(&fil);
return false;
}
UINT v;
f_read(&fil, toWhere, isNib ? 0x1a00 : (256 * 16), &v);
f_close(&fil);
return (v == (isNib ? 0x1a00 : (256 * 16)));
}
bool TeensyFileManager::readBlock(int8_t fd, uint8_t *toWhere, bool isNib)
{
// open, seek, read, close.
if (fd < 0 || fd >= numCached)
return false;
if (cachedNames[fd][0] == 0)
return false;
// open, seek, read, close.
TCHAR buf[MAXPATH];
char2tchar(cachedNames[fd], MAXPATH, buf);
FRESULT rc = f_open(&fil, (TCHAR*) buf, FA_READ);
if (rc) {
Serial.println("failed to open");
return false;
}
rc = f_lseek(&fil, fileSeekPositions[fd]);
if (rc) {
Serial.println("readBlock: seek failed");
f_close(&fil);
return false;
}
UINT v;
f_read(&fil, toWhere, isNib ? 416 : 256, &v);
f_close(&fil);
return (v == (isNib ? 416 : 256));
}
bool TeensyFileManager::writeBlock(int8_t fd, uint8_t *fromWhere, bool isNib)
{
// open, seek, write, close.
if (fd < 0 || fd >= numCached)
return false;
if (cachedNames[fd][0] == 0)
return false;
// can't write just a single block of a nibblized track
if (isNib)
return false;
// open, seek, write, close.
TCHAR buf[MAXPATH];
char2tchar(cachedNames[fd], MAXPATH, buf);
FRESULT rc = f_open(&fil, (TCHAR*) buf, FA_WRITE);
rc = f_lseek(&fil, fileSeekPositions[fd]);
UINT v;
f_write(&fil, fromWhere, 256, &v);
f_close(&fil);
return (v == 256);
}
bool TeensyFileManager::writeTrack(int8_t fd, uint8_t *fromWhere, bool isNib)
{
// open, seek, write, close.
if (fd < 0 || fd >= numCached)
return false;
if (cachedNames[fd][0] == 0)
return false;
// open, seek, write, close.
TCHAR buf[MAXPATH];
char2tchar(cachedNames[fd], MAXPATH, buf);
FRESULT rc = f_open(&fil, (TCHAR*) buf, FA_WRITE);
rc = f_lseek(&fil, fileSeekPositions[fd]);
UINT v;
f_write(&fil, fromWhere, isNib ? 0x1a00 : (256*16), &v);
f_close(&fil);
return (v == (isNib ? 0x1a00 : (256*16)));
}
bool TeensyFileManager::_prepCache(int8_t fd)
{
FRESULT rc;
if (rawFd == -1 ||
rawFd != fd) {
// Not our cached file, or we have no cached file
if (rawFd != -1) {
// Close the old one if we had one
Serial.println("closing old HD cache");
f_close(&rawFil);
rawFd = -1;
}
// Open the new one
TCHAR buf[MAXPATH];
char2tchar(cachedNames[fd], MAXPATH, buf);
rc = f_open(&rawFil, (TCHAR*) buf, FA_READ|FA_WRITE);
if (rc) {
Serial.println("readByteAt: failed to open");
return false;
}
Serial.println("new cache file open");
rawFd = fd; // cache is live
}
return (!rc);
}
uint8_t TeensyFileManager::readByteAt(int8_t fd, uint32_t pos)
{
// open, seek, read, close.
if (fd < 0 || fd >= numCached)
return false;
if (cachedNames[fd][0] == 0)
return false;
FRESULT rc;
_prepCache(fd);
rc = f_lseek(&rawFil, pos);
if (rc) {
Serial.println("readByteAt: seek failed");
return false;
}
uint8_t b;
UINT v;
f_read(&rawFil, &b, 1, &v);
// FIXME: check v == 1 & handle error
return b;
}
bool TeensyFileManager::writeByteAt(int8_t fd, uint8_t v, uint32_t pos)
{
// open, seek, write, close.
if (fd < 0 || fd >= numCached)
return false;
if (cachedNames[fd][0] == 0)
return false;
FRESULT rc;
_prepCache(fd);
rc = f_lseek(&rawFil, pos);
UINT ret;
f_write(&rawFil, &v, 1, &ret);
return (ret == 1);
}