aiie/filemanager.h

153 lines
3.4 KiB
C
Raw Normal View History

#ifndef __FILEMANAGER_H
#define __FILEMANAGER_H
#include <stdint.h>
#define MAXFILES 4 // how many results we can simultaneously manage
#define DIRPAGESIZE 10 // how many results in one readDir
#ifndef MAXPATH
#define MAXPATH 255
#endif
2017-12-30 20:20:34 +00:00
#define FMMAGIC 'F'
2020-06-28 12:29:51 +00:00
#ifndef SEEK_SET
#define SEEK_SET 0
#endif
#ifndef SEEK_CUR
#define SEEK_CUR 1
#endif
class FileManager {
public:
virtual ~FileManager() {};
2020-06-28 19:24:49 +00:00
#define writeByte(fd,x) {static uint8_t c = x; write(outfd, &c, 1);}
2017-12-30 20:20:34 +00:00
virtual bool SerializeFile(int8_t outfd, int8_t fd) {
writeByte(outfd, FMMAGIC);
if (fd == -1 ||
cachedNames[fd][0] == '\0') {
// No file to cache; we're done
writeByte(outfd, 0);
writeByte(outfd, FMMAGIC);
return true;
}
// have a file to cache; set a marker and continue
writeByte(outfd, 1);
int8_t l = 0;
char *p = cachedNames[fd];
while (*p) {
l++;
p++;
}
writeByte(outfd, l);
for (int i=0; i<l; i++) {
writeByte(outfd, cachedNames[fd][i]);
}
writeByte(outfd, (fileSeekPositions[fd] >> 24) & 0xFF);
writeByte(outfd, (fileSeekPositions[fd] >> 16) & 0xFF);
writeByte(outfd, (fileSeekPositions[fd] >> 8) & 0xFF);
writeByte(outfd, (fileSeekPositions[fd] ) & 0xFF);
writeByte(outfd, FMMAGIC);
return true;
}
virtual int8_t DeserializeFile(int8_t infd) {
2020-06-28 19:24:49 +00:00
uint8_t b;
if (read(infd, &b, 1) != 1)
return -1;
if (b != FMMAGIC)
return -1;
if (read(infd, &b, 1) != 1)
2017-12-30 20:20:34 +00:00
return -1;
2020-06-28 19:24:49 +00:00
if (b == 0) {
2017-12-30 20:20:34 +00:00
// No file was cached. Verify footer and we're done without error
2020-06-28 19:24:49 +00:00
if (read(infd, &b, 1) != 1)
return -1;
if (b != FMMAGIC) {
2017-12-30 20:20:34 +00:00
// FIXME: no way to raise this error.
return -1;
}
return -1;
}
char buf[MAXPATH];
2020-06-28 19:24:49 +00:00
if (read(infd, &b, 1) != 1)
return -1;
int8_t len = b;
for (int i=0; i<len; i++) {
if (read(infd, &buf[i], 1) != 1)
return false;
2017-12-30 20:20:34 +00:00
}
2020-06-28 19:24:49 +00:00
buf[len] = '\0';
2017-12-30 20:20:34 +00:00
int8_t ret = openFile(buf);
if (ret == -1)
return ret;
2020-06-28 19:24:49 +00:00
if (read(infd, &b, 1) != 1)
return -1;
fileSeekPositions[ret] <<= 8; fileSeekPositions[ret] |= b;
if (read(infd, &b, 1) != 1)
return -1;
fileSeekPositions[ret] <<= 8; fileSeekPositions[ret] |= b;
if (read(infd, &b, 1) != 1)
return -1;
fileSeekPositions[ret] <<= 8; fileSeekPositions[ret] |= b;
if (read(infd, &b, 1) != 1)
return -1;
fileSeekPositions[ret] <<= 8; fileSeekPositions[ret] |= b;
if (read(infd, &b, 1) != 1)
return -1;
if (b != FMMAGIC)
2017-12-30 20:20:34 +00:00
return -1;
return ret;
}
virtual int8_t openFile(const char *name) = 0;
virtual void closeFile(int8_t fd) = 0;
virtual const char *fileName(int8_t fd) = 0;
2017-02-20 18:55:16 +00:00
virtual int8_t readDir(const char *where, const char *suffix, char *outputFN, int8_t startIdx, uint16_t maxlen) = 0;
virtual void getRootPath(char *toWhere, int8_t maxLen) = 0;
virtual uint32_t getSeekPosition(int8_t fd) {
return fileSeekPositions[fd];
};
virtual bool setSeekPosition(int8_t fd, uint32_t pos) = 0;
virtual void seekToEnd(int8_t fd) = 0;
2020-06-28 13:21:27 +00:00
virtual int write(int8_t fd, const void *buf, int nbyte) = 0;
virtual int read(int8_t fd, void *buf, int nbyte) = 0;
virtual int lseek(int8_t fd, int offset, int whence) = 0;
2017-12-30 20:20:34 +00:00
protected:
2020-07-03 02:02:21 +00:00
volatile unsigned long fileSeekPositions[MAXFILES];
2017-12-30 20:20:34 +00:00
char cachedNames[MAXFILES][MAXPATH];
};
2020-06-28 19:24:49 +00:00
#undef writeByte
#endif