RomDisk.h

00001 // RomDisk.h 2013/9/26
00002 #pragma once
00003 
00004 #define ATTR_READ_ONLY 0x01
00005 #define ATTR_HIDDEN    0x02
00006 #define ATTR_SYSTEM    0x04
00007 #define ATTR_VOLUME_ID 0x08
00008 #define ATTR_DIRECTORY 0x10
00009 #define ATTR_ARCHIVE   0x20
00010 #define ATTR_LONG_NAME (ATTR_READ_ONLY|ATTR_HIDDEN|ATTR_SYSTEM|ATTR_VOLUME_ID)
00011 
00012 struct DirEntry {
00013     uint8_t name[8+3];
00014     uint8_t attr;
00015     uint8_t NTres;
00016     uint8_t cDateTime_ms;
00017     uint16_t cTime;
00018     uint16_t cDate;
00019     uint16_t aDate;
00020     uint16_t clusterHI;
00021     uint16_t mTime;
00022     uint16_t mDate;
00023     uint16_t cluster;
00024     uint32_t size;
00025     bool is_free() {
00026         return name[0] == 0xe5 || name[0] == 0x00;
00027     }
00028     bool is_file() {
00029         return is_free() == false && attr == ATTR_ARCHIVE;
00030     }
00031     int cmpDateTime(DirEntry* entry) {
00032         if (mDate > entry->mDate) {
00033             return 1;
00034         } else if (mDate < entry->mDate) {
00035             return -1;
00036         }
00037         if (mTime > entry->mTime) {
00038             return 1;
00039         } else if (mTime < entry->mTime) {
00040             return -1;
00041         }
00042         return 0;
00043     }
00044 } __attribute__((__packed__));;
00045 
00046 struct SectorIndex {
00047     int block;
00048     const uint8_t* data;
00049 };
00050 
00051 extern const SectorIndex sector_index[]; // RomDiskData.cpp
00052 
00053 class RomDisk {
00054 public:
00055     RomDisk();
00056     int read(uint8_t * data, uint32_t block);
00057     int write(const uint8_t * data, uint32_t block);
00058     uint32_t sectors();
00059     bool is_fat(uint32_t sector);
00060     bool is_rootdir(uint32_t sector);
00061     int dir_count(uint32_t sector);
00062     uint32_t cluster_to_sector(uint32_t cluster);
00063 protected:
00064     uint64_t _sectors;
00065 };