aiie/filemanager.h
2020-06-27 18:00:59 -04:00

131 lines
3.3 KiB
C++

#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
#define FMMAGIC 'F'
class FileManager {
public:
virtual ~FileManager() {};
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) {
if (readByte(infd) != FMMAGIC)
return -1;
if (readByte(infd) == 0) {
// No file was cached. Verify footer and we're done without error
if (readByte(infd) != FMMAGIC) {
// FIXME: no way to raise this error.
return -1;
}
return -1;
}
char buf[MAXPATH];
int8_t l = readByte(infd);
for (int i=0; i<l; i++) {
buf[i] = readByte(infd);
}
buf[l] = '\0';
int8_t ret = openFile(buf);
if (ret == -1)
return ret;
fileSeekPositions[ret] = readByte(infd);
fileSeekPositions[ret] <<= 8;
fileSeekPositions[ret] = readByte(infd);
fileSeekPositions[ret] <<= 8;
fileSeekPositions[ret] = readByte(infd);
fileSeekPositions[ret] <<= 8;
fileSeekPositions[ret] = readByte(infd);
if (readByte(infd) != FMMAGIC)
return -1;
return ret;
}
virtual int8_t openFile(const char *name) = 0;
virtual void closeFile(int8_t fd) = 0;
virtual void truncate(int8_t fd) = 0;
virtual const char *fileName(int8_t fd) = 0;
virtual int8_t readDir(const char *where, const char *suffix, char *outputFN, int8_t startIdx, uint16_t maxlen) = 0;
virtual void seekBlock(int8_t fd, uint16_t block, bool isNib = false) = 0;
virtual bool readTrack(int8_t fd, uint8_t *toWhere, bool isNib = false) = 0;
virtual bool readBlock(int8_t fd, uint8_t *toWhere, bool isNib = false) = 0;
virtual bool writeBlock(int8_t fd, uint8_t *fromWhere, bool isNib = false) = 0;
virtual bool writeTrack(int8_t fd, uint8_t *fromWhere, bool isNib = false) = 0;
virtual uint8_t readByteAt(int8_t fd, uint32_t pos) = 0;
virtual bool writeByteAt(int8_t fd, uint8_t v, uint32_t pos) = 0;
virtual uint8_t readByte(int8_t fd) = 0;
virtual bool writeByte(int8_t fd, uint8_t v) = 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;
protected:
unsigned long fileSeekPositions[MAXFILES];
char cachedNames[MAXFILES][MAXPATH];
};
#endif