613 lines
14 KiB
C
613 lines
14 KiB
C
#include <limits.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <time.h>
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typedef unsigned char uchar, uint8;
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typedef unsigned short uint16;
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#ifndef __SMALLER_C__
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#if UINT_MAX >= 0xFFFFFFFF
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typedef unsigned uint32;
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#else
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typedef unsigned long uint32;
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#endif
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#else
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typedef unsigned long uint32;
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#endif
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typedef unsigned uint;
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typedef unsigned long ulong;
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#ifndef __SMALLER_C__
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#define C_ASSERT(expr) extern char CAssertExtern[(expr)?1:-1]
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C_ASSERT(CHAR_BIT == 8);
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C_ASSERT(sizeof(uint16) == 2);
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C_ASSERT(sizeof(uint32) == 4);
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#endif
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#pragma pack (push, 1)
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typedef struct tFATBPB1
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{
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uint16 BytesPerSector;
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uint8 SectorsPerCluster;
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uint16 ReservedSectorsCount;
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uint8 NumberOfFATs;
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uint16 RootEntriesCount;
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uint16 TotalSectorsCount16;
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uint8 MediaType;
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uint16 SectorsPerFAT1x;
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uint16 SectorsPerTrack;
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uint16 HeadsPerCylinder;
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uint32 HiddenSectorsCount;
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uint32 TotalSectorsCount32;
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} tFATBPB1;
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typedef union tFATBPB2
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{
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struct
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{
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uint8 DriveNumber;
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uint8 reserved1;
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uint8 ExtendedBootSignature;
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uint32 VolumeSerialNumber;
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char VolumeLabel[11];
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char FileSystemName[8];
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uchar aBootCode1x[0x1C];
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} FAT1x;
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struct
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{
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uint32 SectorsPerFAT32;
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uint16 ExtendedFlags;
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uint16 FSVersion;
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uint32 RootDirectoryClusterNo;
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uint16 FSInfoSectorNo;
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uint16 BackupBootSectorNo;
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uint8 reserved[12];
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uint8 DriveNumber;
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uint8 reserved1;
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uint8 ExtendedBootSignature;
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uint32 VolumeSerialNumber;
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char VolumeLabel[11];
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char FileSystemName[8];
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} FAT32;
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} tFATBPB2;
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typedef struct tFATBPB
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{
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tFATBPB1 BPB1;
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tFATBPB2 BPB2;
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} tFATBPB;
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typedef struct tFATBootSector
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{
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uchar aJump[3];
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char OEMName[8];
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tFATBPB BPB;
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uchar aBootCode32[0x1A4];
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uint16 Signature0xAA55;
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} tFATBootSector;
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typedef enum tFATDirEntryAttribute
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{
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dea_READ_ONLY = 0x01,
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dea_HIDDEN = 0x02,
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dea_SYSTEM = 0x04,
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dea_VOLUME_ID = 0x08,
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dea_DIRECTORY = 0x10,
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dea_ARCHIVE = 0x20,
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dea_LONG_NAME = dea_READ_ONLY|dea_HIDDEN|dea_SYSTEM|dea_VOLUME_ID
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} tFATDirEntryAttribute;
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typedef struct tFATDirectoryEntry
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{
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char Name[8];
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char Extension[3];
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uint8 Attribute;
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uint8 WinNTreserved;
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uint8 CreationTimeSecTenths;
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uint16 CreationTime2Secs;
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uint16 CreationDate;
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uint16 LastAccessDate;
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uint16 FirstClusterHiWord;
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uint16 LastWriteTime;
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uint16 LastWriteDate;
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uint16 FirstClusterLoWord;
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uint32 Size;
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} tFATDirectoryEntry;
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#define DELETED_DIR_ENTRY_MARKER 0xE5
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#pragma pack (pop)
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#ifndef __SMALLER_C_32__
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C_ASSERT(sizeof(tFATBootSector) == 512);
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C_ASSERT(sizeof(tFATDirectoryEntry) == 32);
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#endif
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#define FBUF_SIZE 1024
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char* BootSectName;
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char* OutName = "floppy.img";
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int UniqueSerial;
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FILE* fout;
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tFATBootSector BootSector;
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uint32 Fat1Lba;
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uint32 SectorsPerFat;
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uint32 Fats;
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uint32 RootDirLba;
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uint32 DirEntriesPerSector;
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uint32 RootDirEntries;
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uint32 RootDirSectors;
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uint32 Cluster2Lba;
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uint32 SectorsPerCluster;
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uint32 ClusterSize;
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uint32 DataSectors;
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uint32 Clusters;
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uint8 FatSector[512];
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uint32 Cluster;
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tFATDirectoryEntry RootDirSector[512 / sizeof(tFATDirectoryEntry)];
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uint32 RootDirEntryIdx;
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void error(char* format, ...)
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{
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#ifndef __SMALLER_C__
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va_list vl;
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va_start(vl, format);
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#else
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void* vl = &format + 1;
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#endif
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if (fout)
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fclose(fout);
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remove(OutName);
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puts("");
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vprintf(format, vl);
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#ifndef __SMALLER_C__
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va_end(vl);
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#endif
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exit(EXIT_FAILURE);
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}
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FILE* Fopen(const char* filename, const char* mode)
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{
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FILE* stream = fopen(filename, mode);
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if (!stream)
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error("Can't open/create file \"%s\"\n", filename);
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return stream;
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}
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void Fclose(FILE* stream)
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{
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if (fclose(stream))
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error("Can't close a file\n");
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}
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void Fseek(FILE* stream, long offset, int whence)
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{
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int r = fseek(stream, offset, whence);
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if (r)
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error("Can't seek a file\n");
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}
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void Fread(void* ptr, size_t size, FILE* stream)
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{
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size_t r = fread(ptr, 1, size, stream);
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if (r != size)
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error("Can't read a file\n");
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}
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void Fwrite(const void* ptr, size_t size, FILE* stream)
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{
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size_t r = fwrite(ptr, 1, size, stream);
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if (r != size)
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error("Can't write a file\n");
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}
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void FillWithByte(unsigned char byte, unsigned long size, FILE* stream)
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{
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static unsigned char buf[FBUF_SIZE];
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memset(buf, byte, FBUF_SIZE);
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while (size)
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{
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unsigned long csz = size;
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if (csz > FBUF_SIZE)
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csz = FBUF_SIZE;
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Fwrite(buf, csz, stream);
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size -= csz;
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}
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}
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// Determines binary file size portably (when stat()/fstat() aren't available)
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long fsize(FILE* binaryStream)
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{
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long ofs, ofs2;
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int result;
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if (fseek(binaryStream, 0, SEEK_SET) != 0 ||
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fgetc(binaryStream) == EOF)
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return 0;
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ofs = 1;
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while ((result = fseek(binaryStream, ofs, SEEK_SET)) == 0 &&
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(result = (fgetc(binaryStream) == EOF)) == 0 &&
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ofs <= LONG_MAX / 4 + 1)
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ofs *= 2;
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// If the last seek failed, back up to the last successfully seekable offset
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if (result != 0)
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ofs /= 2;
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for (ofs2 = ofs / 2; ofs2 != 0; ofs2 /= 2)
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if (fseek(binaryStream, ofs + ofs2, SEEK_SET) == 0 &&
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fgetc(binaryStream) != EOF)
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ofs += ofs2;
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// Return -1 for files longer than LONG_MAX
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if (ofs == LONG_MAX)
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return -1;
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return ofs + 1;
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}
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void FlushFatSector(void)
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{
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uint32 ofs = (Cluster * 3 / 2) & 511;
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uint32 i;
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if (ofs == 0 && (Cluster & 1) == 0)
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return;
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for (i = 0; i < Fats; i++)
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{
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uint32 ofs = Fat1Lba + i * SectorsPerFat;
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ofs += (Cluster * 3 / 2) / 512;
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Fseek(fout, ofs * 512, SEEK_SET);
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Fwrite(FatSector, sizeof FatSector, fout);
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}
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memset(FatSector, 0, sizeof FatSector);
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}
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void ChainCluster(uint32 nextCluster)
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{
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uint32 ofs = (Cluster * 3 / 2) & 511;
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if (Cluster & 1)
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FatSector[ofs] |= nextCluster << 4;
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else
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FatSector[ofs] = nextCluster;
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if (ofs == 511)
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FlushFatSector();
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ofs = (ofs + 1) & 511;
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if (Cluster & 1)
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FatSector[ofs] = nextCluster >> 4;
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else
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FatSector[ofs] = (nextCluster >> 8) & 0xF;
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if (ofs == 511 && (Cluster & 1))
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FlushFatSector();
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Cluster++;
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}
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void FlushRootDirSector(void)
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{
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uint32 ofs;
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if (RootDirEntryIdx % DirEntriesPerSector == 0)
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return;
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ofs = RootDirLba + RootDirEntryIdx / DirEntriesPerSector;
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Fseek(fout, ofs * 512, SEEK_SET);
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Fwrite(RootDirSector, sizeof RootDirSector, fout);
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}
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void AddRootDirEntry(tFATDirectoryEntry* de)
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{
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RootDirSector[RootDirEntryIdx % DirEntriesPerSector] = *de;
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if ((RootDirEntryIdx + 1) % DirEntriesPerSector == 0)
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FlushRootDirSector();
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RootDirEntryIdx++;
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}
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void Init(void)
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{
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if (BootSectName)
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{
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FILE* fsect = Fopen(BootSectName, "rb");
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Fread(&BootSector, sizeof BootSector, fsect);
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Fclose(fsect);
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}
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else
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{
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memcpy(BootSector.OEMName, "BootProg", 8);
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memcpy(BootSector.BPB.BPB2.FAT1x.VolumeLabel, "NO NAME ", 11);
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memcpy(BootSector.BPB.BPB2.FAT1x.FileSystemName, "FAT12 ", 8);
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BootSector.aJump[0] = 0xEB; // jmp short $+0x3E
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BootSector.aJump[1] = 0x3C;
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BootSector.aJump[2] = 0x90; // nop
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// TBD??? replace the below with code to print an error message like "Not a system/bootable disk"?
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BootSector.BPB.BPB2.FAT1x.aBootCode1x[0] = 0xF4; // hlt
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BootSector.BPB.BPB2.FAT1x.aBootCode1x[1] = 0xEB; // jmp short $-1
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BootSector.BPB.BPB2.FAT1x.aBootCode1x[2] = 0xFD;
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}
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fout = Fopen(OutName, "wb");
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BootSector.BPB.BPB1.BytesPerSector = 512; // note, we're normally assuming 512 bytes per sector everywhere
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BootSector.BPB.BPB1.SectorsPerCluster = 1;
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BootSector.BPB.BPB1.ReservedSectorsCount = 1; // includes the boot sector
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BootSector.BPB.BPB1.NumberOfFATs = 2;
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BootSector.BPB.BPB1.RootEntriesCount = 224; // must be a multiple of 16 (16 32-byte entries in 512-byte sector)
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BootSector.BPB.BPB1.TotalSectorsCount16 = 2880;
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BootSector.BPB.BPB1.MediaType = 0xF0;
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BootSector.BPB.BPB1.SectorsPerFAT1x = 9;
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BootSector.BPB.BPB1.SectorsPerTrack = 18;
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BootSector.BPB.BPB1.HeadsPerCylinder = 2;
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BootSector.BPB.BPB1.HiddenSectorsCount = 0;
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BootSector.BPB.BPB1.TotalSectorsCount32 = 0;
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BootSector.BPB.BPB2.FAT1x.DriveNumber = 0;
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BootSector.BPB.BPB2.FAT1x.reserved1 = 0;
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BootSector.BPB.BPB2.FAT1x.ExtendedBootSignature = 0x29;
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BootSector.BPB.BPB2.FAT1x.VolumeSerialNumber = 0x11223344;
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if (UniqueSerial)
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BootSector.BPB.BPB2.FAT1x.VolumeSerialNumber = time(NULL);
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BootSector.Signature0xAA55 = 0xAA55;
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// Write the boot sector
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Fwrite(&BootSector, sizeof BootSector, fout);
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// Zero out the rest of the image
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FillWithByte(0, (BootSector.BPB.BPB1.TotalSectorsCount16 - 1) * 512UL, fout);
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// FAT12's first two entries need special initialization
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ChainCluster(0xF00 | BootSector.BPB.BPB1.MediaType);
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ChainCluster(0xFFF);
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// Helper variables
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Fat1Lba = BootSector.BPB.BPB1.ReservedSectorsCount;
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SectorsPerFat = BootSector.BPB.BPB1.SectorsPerFAT1x;
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Fats = BootSector.BPB.BPB1.NumberOfFATs;
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RootDirLba = Fat1Lba + SectorsPerFat * Fats;
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DirEntriesPerSector = 512 / sizeof(tFATDirectoryEntry);
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RootDirEntries = BootSector.BPB.BPB1.RootEntriesCount;
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RootDirSectors = (RootDirEntries * sizeof(tFATDirectoryEntry) + 511) / 512;
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Cluster2Lba = RootDirLba + RootDirSectors;
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SectorsPerCluster = BootSector.BPB.BPB1.SectorsPerCluster;
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ClusterSize = SectorsPerCluster * 512;
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DataSectors = BootSector.BPB.BPB1.TotalSectorsCount16 -
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BootSector.BPB.BPB1.ReservedSectorsCount - SectorsPerFat * Fats - RootDirSectors;
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Clusters = DataSectors / SectorsPerCluster;
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}
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void Done(void)
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{
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FlushFatSector();
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FlushRootDirSector();
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Fclose(fout);
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}
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void NameTo8Dot3Name(const char* in, char out[8 + 3])
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{
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static const char aInvalid8Dot3NameChars[] = "\"*+,./:;<=>?[\\]|";
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int i, j;
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int namelen = 0, dots = 0, extlen = 0;
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memset(out, ' ', 8 + 3);
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if (*in == '\0' || *in == '.')
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goto lerr;
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for (j = i = 0; in[i]; i++)
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{
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int c = (unsigned char)in[i];
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if (i >= 12) // at most 12 input chars can fit into an 8.3 name
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goto lerr;
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if (i == 0 && c == 0xE5)
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{
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// 0xE5 in the first character of the name is a marker for deleted files,
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// it needs to be translated to 0x05
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c = 0x05;
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}
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else if (c == '.')
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{
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if (dots++) // at most one dot allowed
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goto lerr;
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j = 8; // now writing extension
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continue;
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}
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if (c <= 0x20 || strchr(aInvalid8Dot3NameChars, c) != NULL)
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goto lerr;
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if (dots)
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{
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if (++extlen > 3) // at most 3 chars in extension
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goto lerr;
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}
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else
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{
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if (++namelen > 8) // at most 8 chars in name
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goto lerr;
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}
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if (c >= 'a' && c <= 'z')
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c -= 'a' - 'A';
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out[j++] = c;
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}
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// TBD??? error out on the following reserved names: "COM1"-"COM9", "CON", "LPT1"-"LPT9", "NUL", "PRN"?
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return;
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lerr:
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error("Can't convert \"%s\" to an 8.3 DOS name\n", in);
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}
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void AddFile(char* fname)
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{
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char* pslash = strrchr(fname, '/');
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char* pbackslash = strrchr(fname, '\\');
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char* pname;
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char name8_3[8 + 3];
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FILE* f;
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long size;
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tFATDirectoryEntry de;
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uint32 ofs;
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// First, find where the path ends in the file name, if any
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// In DOS/Windows paths can contain either '\\' or '/' as a separator between directories,
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// choose the right-most
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if (pslash && pbackslash)
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{
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if (pslash < pbackslash)
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pslash = pbackslash;
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}
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else if (!pslash)
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{
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pslash = pbackslash;
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}
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// If there's no slash, it could be "c:file"
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if (!pslash && ((*fname >= 'A' && *fname <= 'Z') || (*fname >= 'a' && *fname <= 'z')) && fname[1] == ':')
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pslash = fname + 1;
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pname = pslash ? pslash + 1 : fname;
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// Convert the name to 8.3
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NameTo8Dot3Name(pname, name8_3);
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// TBD!!! error out on duplicate files/names
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// Copy the file
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f = Fopen(fname, "rb");
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// Prepare the directory entry
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memset(&de, 0, sizeof de);
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memcpy(de.Name, name8_3, 8 + 3);
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de.Attribute = dea_ARCHIVE;
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de.Size = size = fsize(f);
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if (RootDirEntryIdx >= RootDirEntries ||
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size < 0 || (unsigned long)size > Clusters * ClusterSize)
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error("No space for file \"%s\"", fname);
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if (size)
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{
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de.FirstClusterLoWord = Cluster;
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de.FirstClusterHiWord = Cluster >> 16;
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}
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// TBD??? set file date/time to now?
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de.LastWriteDate = ((1990 - 1980) << 9) | (1 << 5) | 1; // 1990/01/01
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de.LastWriteTime = (12 << 11) | (0 << 5) | (0 >> 1); // 12(PM):00:00
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// Seek both files
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Fseek(f, 0, SEEK_SET);
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ofs = Cluster2Lba + (Cluster - 2) * SectorsPerCluster;
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Fseek(fout, ofs * 512, SEEK_SET);
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// Copy data sectors
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while (size)
|
|
{
|
|
uint8 sector[512];
|
|
long sz = (size > 512) ? 512 : size;
|
|
|
|
memset(sector, 0, 512); // pad with zeroes the last partial sector
|
|
Fread(sector, sz, f);
|
|
|
|
Fwrite(sector, 512, fout);
|
|
|
|
size -= sz;
|
|
}
|
|
|
|
// Allocate and chain clusters in the FAT
|
|
size = de.Size;
|
|
while (size)
|
|
{
|
|
if (size > (long)ClusterSize)
|
|
{
|
|
// There's at least one more cluster in the chain
|
|
ChainCluster(Cluster + 1);
|
|
size -= ClusterSize;
|
|
}
|
|
else
|
|
{
|
|
// No more clusters, this is the last one in the chain
|
|
ChainCluster(0xFF8);
|
|
size = 0;
|
|
}
|
|
Clusters--;
|
|
}
|
|
|
|
// Write the directory entry
|
|
AddRootDirEntry(&de);
|
|
|
|
Fclose(f);
|
|
}
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
int i;
|
|
|
|
for (i = 1; i < argc; i++)
|
|
{
|
|
if (!strcmp(argv[i], "-o"))
|
|
{
|
|
if (i + 1 < argc)
|
|
{
|
|
argv[i++] = NULL;
|
|
OutName = argv[i];
|
|
argv[i] = NULL;
|
|
continue;
|
|
}
|
|
}
|
|
else if (!strcmp(argv[i], "-bs"))
|
|
{
|
|
if (i + 1 < argc)
|
|
{
|
|
argv[i++] = NULL;
|
|
BootSectName = argv[i];
|
|
argv[i] = NULL;
|
|
continue;
|
|
}
|
|
}
|
|
else if (!strcmp(argv[i], "-us"))
|
|
{
|
|
UniqueSerial = 1;
|
|
argv[i++] = NULL;
|
|
continue;
|
|
}
|
|
|
|
if (argv[i][0] == '-')
|
|
error("Invalid or unsupported command line option\n");
|
|
}
|
|
|
|
Init();
|
|
|
|
for (i = 1; i < argc; i++)
|
|
if (argv[i])
|
|
AddFile(argv[i]);
|
|
|
|
Done();
|
|
|
|
return 0;
|
|
}
|