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cbmarcs.c
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cbmarcs.c
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/*
* cbmarcs.c
*
* Commodore archive formats directory display routines
*
* Compile this file with "pack structures" compiler flag if not GNU C
*
* fvcbm is copyright 1993-2023 Dan Fandrich, et. al.
* fvcbm is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* fvcbm is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with fvcbm; if not, see <https://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "cbmarcs.h"
#ifdef __MSDOS__
#include <io.h>
#else
extern long filelength(int);
#endif
#if defined(MSC) || defined(SCO)
#define stricmp strcmp /* this isn't equivalent, but it's good enough */
#elif defined(__GNUC__)
#define stricmp strcasecmp
#endif
#ifdef __GNUC__
#define PACK __attribute__ ((packed)) /* pack structures on byte boundaries */
#else
#define PACK /* pack using a compiler switch instead */
#endif
#ifdef SUNOS
#include <unistd.h>
#endif
#ifdef DEBUG
/* Enable low-level debug logs */
#define DEBUGLOG printf
#else
/* Disable low-level debug logs */
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
#define DEBUGLOG(...) do { } while (0)
#elif defined(__GNUC__)
#define DEBUGLOG(x...) do { } while (0)
#else
#define DEBUGLOG (void)
#endif
#endif
extern char *ProgName;
/******************************************************************************
* Constants
******************************************************************************/
/* These descriptions must be in the order encountered in ArchiveTypes */
const char * const ArchiveFormats[] = {
/* C64_ARC */ " ARC",
/* C64_10 */ " C64",
/* C64_13 */ " C64",
/* C64_15 */ " C64",
/* C128_15 */ "C128",
/* LHA_SFX */ " LHA",
/* LHA */ " LHA",
/* Lynx */ "Lynx",
/* New Lynx */ "Lynx",
/* Tape image */" T64",
/* Disk image */" D64",
/* Disk image */"1581",
/* Disk image */" X64",
/* PRG file */ " P00",
/* SEQ file */ " S00",
/* USR file */ " U00",
/* REL file */ " R00",
/* DEL file */ " D00",
/* P00-like */ "P00?",
/* N64 file */ " N64",
/* LBR file */ " LBR",
/* TAP file */ " TAP"
};
/* File types as found on disk (bitwise AND code with CBM_TYPE) */
static const char * const CBMFileTypes[] = {
/* 0 */ "DEL",
/* 1 */ "SEQ",
/* 2 */ "PRG",
/* 3 */ "USR",
/* 4 */ "REL",
/* 5 */ "CBM", /* 1581 partition type */
/* 6 */ "DJJ", /* C65 file type */
/* 7 */ "FAB" /* C65 file type */
};
/* File type mask bits */
enum {
CBM_DEL = 0,
CBM_SEQ,
CBM_PRG,
CBM_USR,
CBM_REL,
CBM_CBM,
CBM_DJJ,
CBM_FAB,
CBM_TYPE = 0x07, /* Mask to get preceding 8 file types */
CBM_CLOSED = 0x80, /* Mask to get closed bit */
CBM_LOCKED = 0x40 /* Mask to get locked bit */
};
/* End of 1541 filename character */
enum { CBM_END_NAME = '\xA0' };
/* 1571 double sided flag */
enum { FLAG_DOUBLE_SIDED = 0x80 };
/******************************************************************************
* Types
******************************************************************************/
typedef int bool;
/******************************************************************************
* Functions
******************************************************************************/
/******************************************************************************
* Return smallest of 2 numbers
******************************************************************************/
#ifndef min
#define min(a,b) (((a) < (b)) ? (a) : (b))
#endif
/******************************************************************************
* Return file type string given letter code
******************************************************************************/
static const char *FileTypes(char TypeCode)
{
switch (toupper(TypeCode)) {
case 'P': return "PRG";
case 'S': return "SEQ";
case 'U': return "USR";
case 'R': return "REL";
case 'D': return "DEL";
case ' ': return " ";
default: return "???";
}
}
/******************************************************************************
* Convert CBM file names into ASCII strings
* Converts in place & returns pointer to start of string
******************************************************************************/
static char *ConvertCBMName(char *InString)
{
char *LastNonBlank = InString;
char *Ch;
for (Ch = InString; *Ch; ++Ch)
if (!isspace(*Ch = *Ch & 0x7F)) /* strip high bit */
LastNonBlank = Ch;
*++LastNonBlank = 0; /* truncate string after last character */
return InString;
}
/*---------------------------------------------------------------------------*/
/******************************************************************************
* ARC routines
******************************************************************************/
struct ArchiveHeaderNew {
BYTE Filler1 PACK;
BYTE FirstOffL PACK;
BYTE Filler2[3] PACK;
BYTE FirstOffH PACK;
};
struct ArchiveEntryHeader {
BYTE Magic PACK;
BYTE EntryType PACK;
WORD Checksum PACK;
WORD LengthL PACK;
BYTE LengthH PACK;
BYTE BlockLength PACK;
BYTE Filler PACK;
BYTE FileType PACK;
BYTE FileNameLen PACK;
};
enum {MagicARCEntry = 2};
struct C64_10 {
WORD StartAddress PACK;
BYTE Filler1[2] PACK;
WORD Version PACK;
BYTE Magic1[10] PACK;
BYTE Filler2 PACK;
BYTE FirstOffL PACK;
BYTE Magic2[3] PACK;
BYTE FirstOffH PACK;
};
struct C64_13 {
WORD StartAddress PACK;
BYTE Filler1[2] PACK;
WORD Version PACK;
BYTE Magic1[10] PACK;
BYTE Filler2[11] PACK;
BYTE FirstOffL PACK;
BYTE Magic2[3] PACK;
BYTE FirstOffH PACK;
};
struct C64_15 {
WORD StartAddress PACK;
BYTE Filler1[2] PACK;
WORD Version PACK;
BYTE Magic1[10] PACK;
BYTE Filler2[7] PACK;
BYTE Magic2[4] PACK;
WORD StartPointer PACK;
};
struct C128_15 {
WORD StartAddress PACK;
BYTE Filler1[2] PACK;
WORD Version PACK;
BYTE Magic1[10] PACK;
BYTE Magic2 PACK;
WORD StartPointer PACK;
};
struct C64_ARC {
BYTE Magic PACK;
BYTE EntryType PACK;
};
/* CBM ARC compression types */
static const char * const ARCEntryTypes[] = {
/* 0 */ "Stored",
/* 1 */ "Packed",
/* 2 */ "Squeezed",
/* 3 */ "Crunched",
/* 4 */ "Squashed",
/* 5 */ "?5", /* future use */
/* 6 */ "?6",
/* 7 */ "?7"
};
enum {MaxARCEntry = 7};
static const BYTE MagicHeaderC64[10] = {0x9e,'(','2','0','6','3',')',0x00,0x00,0x00};
static const BYTE MagicHeaderC128[10] = {0x9e,'(','7','1','8','3',')',0x00,0x00,0x00};
/******************************************************************************
* Is archive C64 ARC format?
******************************************************************************/
bool IsC64_10(FILE *InFile, const char *FileName)
{
static const BYTE MagicC64_10[3] = {0x85,0xfd,0xa9};
struct C64_10 Header;
rewind(InFile);
return ((fread(&Header, sizeof(Header), 1, InFile) == 1)
&& (memcmp(Header.Magic1, MagicHeaderC64, sizeof(MagicHeaderC64)) == 0)
&& (memcmp(Header.Magic2, MagicC64_10, sizeof(MagicC64_10)) == 0));
}
bool IsC64_13(FILE *InFile, const char *FileName)
{
static const BYTE MagicC64_13[3] = {0x85,0x2f,0xa9};
struct C64_13 Header;
rewind(InFile);
return ((fread(&Header, sizeof(Header), 1, InFile) == 1)
&& (memcmp(Header.Magic1, MagicHeaderC64, sizeof(MagicHeaderC64)) == 0)
&& (memcmp(Header.Magic2, MagicC64_13, sizeof(MagicC64_13)) == 0));
}
bool IsC64_15(FILE *InFile, const char *FileName)
{
static const BYTE MagicC64_15[4] = {0x8d,0x21,0xd0,0x4c};
struct C64_15 Header;
rewind(InFile);
return ((fread(&Header, sizeof(Header), 1, InFile) == 1)
&& (memcmp(Header.Magic1, MagicHeaderC64, sizeof(MagicHeaderC64)) == 0)
&& (memcmp(Header.Magic2, MagicC64_15, sizeof(MagicC64_15)) == 0));
}
bool IsC128_15(FILE *InFile, const char *FileName)
{
static const BYTE MagicC128_15 = 0x4c;
struct C128_15 Header;
rewind(InFile);
return ((fread(&Header, sizeof(Header), 1, InFile) == 1)
&& (memcmp(Header.Magic1, MagicHeaderC128, sizeof(MagicHeaderC128)) == 0)
&& (Header.Magic2 == MagicC128_15));
}
bool IsC64_ARC(FILE *InFile, const char *FileName)
{
enum {MagicHeaderARC = 2};
struct C64_ARC Header;
rewind(InFile);
return ((fread(&Header, sizeof(Header), 1, InFile) == 1)
&& ((BYTE) Header.Magic == MagicHeaderARC)
&& ((BYTE) Header.EntryType <= MaxARCEntry));
}
/******************************************************************************
* Read directory
******************************************************************************/
int DirARC(FILE *InFile, enum ArchiveTypes ArcType, struct ArcTotals *Totals,
DisplayStartFunc DisplayStart, DisplayEntryFunc DisplayEntry)
{
long CurrentPos;
Totals->ArchiveEntries = 0;
Totals->TotalBlocks = 0;
Totals->TotalBlocksNow = 0;
Totals->TotalLength = 0;
Totals->DearcerBlocks = 0;
Totals->Version = 0;
if (fseek(InFile, 0, SEEK_SET) != 0) {
perror(ProgName);
return 2;
}
/******************************************************************************
* Find the version number and first archive entry offset for each format
******************************************************************************/
switch (ArcType) {
case C64_ARC: /* Not a self dearcer -- just the arc data */
CurrentPos = 0L;
break;
case C64_10: {
struct C64_10 Header;
if (fread(&Header, sizeof(Header), 1, InFile) != 1) {
fprintf(stderr,"%s: Archive format error\n", ProgName);
return 2;
}
CurrentPos = 1016;
/*
CurrentPos = ((Header.FirstOffH << 8) |
Header.FirstOffL) -
CF_LE_W(Header.StartAddress) + 2;
*/
Totals->Version = -CF_LE_W(Header.Version);
Totals->DearcerBlocks = (int) ((CurrentPos-1) / 254 + 1);
}
break;
case C64_13: {
struct C64_13 Header;
if (fread(&Header, sizeof(Header), 1, InFile) != 1) {
fprintf(stderr,"%s: Archive format error\n", ProgName);
return 2;
}
CurrentPos = 1778;
/*
CurrentPos = ((Header.FirstOffH << 8) |
Header.FirstOffL) -
CF_LE_W(Header.StartAddress) + 2;
*/
Totals->Version = -CF_LE_W(Header.Version);
Totals->DearcerBlocks = (int) ((CurrentPos-1) / 254 + 1);
}
break;
case C64_15: {
struct C64_15 Header;
if (fread(&Header, sizeof(Header), 1, InFile) != 1) {
fprintf(stderr,"%s: Archive format error\n", ProgName);
return 2;
}
CurrentPos = 2286;
/*
fseek(InFile, CF_LE_W(Header.StartPointer) -
CF_LE_W(Header.StartAddress) + 2, SEEK_SET);
fread(&FileHeaderNew, sizeof(FileHeaderNew), 1, InFile);
CurrentPos = ((FileHeaderNew.FirstOffH << 8) |
FileHeaderNew.FirstOffL) -
CF_LE_W(Header.StartAddress) + 2;
*/
Totals->Version = -CF_LE_W(Header.Version);
Totals->DearcerBlocks = (int) ((CurrentPos-1) / 254 + 1);
}
break;
case C128_15: {
struct C128_15 Header;
if (fread(&Header, sizeof(Header), 1, InFile) != 1) {
fprintf(stderr,"%s: Archive format error\n", ProgName);
return 2;
}
CurrentPos = 2285;
/*
fseek(InFile, CF_LE_W(Header.StartPointer) -
CF_LE_W(Header.StartAddress) + 2, SEEK_SET);
fread(&FileHeaderNew, sizeof(FileHeaderNew), 1, InFile);
CurrentPos = ((FileHeaderNew.FirstOffH << 8) |
FileHeaderNew.FirstOffL) -
CF_LE_W(Header.StartAddress) + 2;
*/
Totals->Version = -CF_LE_W(Header.Version);
Totals->DearcerBlocks = (int) ((CurrentPos-1) / 254 + 1);
}
break;
default:
return 2; /* wrong archive type */
}
/*printf("DirArc CurrentPos: %ld\n", CurrentPos);*/
/******************************************************************************
* Read the archive directory contents
******************************************************************************/
if (fseek(InFile, CurrentPos, SEEK_SET) != 0) {
perror(ProgName);
return 2;
}
DisplayStart(ArcType, NULL);
while (1) {
char EntryName[17];
long FileLen;
struct ArchiveEntryHeader FileHeader;
/* struct ArchiveHeaderNew FileHeaderNew;*/
if (fread(&FileHeader, sizeof(FileHeader), 1, InFile) != 1)
break;
if (FileHeader.Magic != MagicARCEntry)
break;
if (fread(&EntryName, FileHeader.FileNameLen, 1, InFile) != 1)
break;
EntryName[FileHeader.FileNameLen] = 0;
FileLen = (long) (FileHeader.LengthH << 16L) | CF_LE_W(FileHeader.LengthL);
DisplayEntry(
ConvertCBMName(EntryName),
FileTypes(FileHeader.FileType),
(long) FileLen,
(unsigned) ((FileLen-1) / 254 + 1),
ARCEntryTypes[FileHeader.EntryType],
(int) (100 - (FileHeader.BlockLength * 100L / (FileLen / 254 + 1))),
(unsigned) FileHeader.BlockLength,
(long) CF_LE_W(FileHeader.Checksum)
);
CurrentPos += FileHeader.BlockLength * 254;
if (fseek(InFile, CurrentPos, SEEK_SET) != 0) {
perror(ProgName);
return 2;
}
++Totals->ArchiveEntries;
Totals->TotalLength += FileLen;
Totals->TotalBlocks += (int) ((FileLen-1) / 254 + 1);
Totals->TotalBlocksNow += FileHeader.BlockLength;
};
return 0;
}
/*---------------------------------------------------------------------------*/
/******************************************************************************
* Lynx reading routines
******************************************************************************/
/******************************************************************************
* Convert Roman numeral to decimal
* Only works for numerals up to 399
* Note: input string is cleared
******************************************************************************/
static int RomanToDec(char *Roman)
{
int Last = -1;
int Value = 0;
while (*Roman) {
int Digit;
switch (toupper(*Roman)) {
case 'I': Digit = 1; break;
case 'V': Digit = 5; break;
case 'X': Digit = 10; break;
case 'L': Digit = 50; break;
case 'C': Digit = 100; break;
default: Digit = 0; break;
}
Value = Last < Digit ? Digit - Value: Value + RomanToDec(Roman);
Last = Digit;
*Roman++ = 0;
}
return Value;
}
static const BYTE MagicHeaderLynx[10] = {' ','1',' ',' ',' ','L','Y','N','X',' '};
static const BYTE MagicHeaderLynxNew[25] = {0x97,'5','3','2','8','0',',','0',0x3A,
0x97,'5','3','2','8','1',',','0',0x3A,
0x97,'6','4','6',',',0xC2,0x28};
struct Lynx {
BYTE Magic[sizeof(MagicHeaderLynx)] PACK;
};
struct LynxNew {
WORD StartAddress PACK;
WORD EndHeaderAddr PACK;
WORD Version PACK;
BYTE Magic[sizeof(MagicHeaderLynxNew)] PACK;
};
/******************************************************************************
* Is archive Lynx format?
******************************************************************************/
bool IsLynx(FILE *InFile, const char *FileName)
{
struct Lynx Header;
rewind(InFile);
return ((fread(&Header, sizeof(Header), 1, InFile) == 1)
&& (memcmp(Header.Magic, MagicHeaderLynx, sizeof(MagicHeaderLynx)) == 0));
}
bool IsLynxNew(FILE *InFile, const char *FileName)
{
struct LynxNew Header;
rewind(InFile);
return ((fread(&Header, sizeof(Header), 1, InFile) == 1)
&& (memcmp(Header.Magic, MagicHeaderLynxNew, sizeof(MagicHeaderLynxNew)) == 0));
}
/******************************************************************************
* Read directory
******************************************************************************/
int DirLynx(FILE *InFile, enum ArchiveTypes LynxType, struct ArcTotals *Totals,
DisplayStartFunc DisplayStart, DisplayEntryFunc DisplayEntry)
{
int NumFiles;
char LynxVer[10];
char LynxName[16];
int ExpectLastLength;
Totals->ArchiveEntries = 0;
Totals->TotalBlocks = 0;
Totals->TotalBlocksNow = 0;
Totals->TotalLength = 0;
Totals->DearcerBlocks = 0;
Totals->Version = 0;
/******************************************************************************
* Find the version number and first archive entry offset for each format
******************************************************************************/
switch (LynxType) {
case Lynx:
if (fseek(InFile, 0, SEEK_SET) != 0) {
perror(ProgName);
return 2;
}
if (fscanf(InFile, " %*s LYNX %s %*[^\r]", LynxVer) != 1) {
fprintf(stderr,"%s: Archive format error\n", ProgName);
return 2;
}
getc(InFile); /* Get CR without killing whitespace */
Totals->Version = RomanToDec(LynxVer);
Totals->DearcerBlocks = 0;
ExpectLastLength = Totals->Version >= 10;
break;
case LynxNew:
/* fseek(InFile, CF_LE_W(Header.Type.LynxNew.EndHeaderAddr) -
CF_LE_W(Header.Type.LynxNew.StartAddress) + 5, SEEK_SET); */
if (fseek(InFile, 0x5F, SEEK_SET) != 0) {
perror(ProgName);
return 2;
}
if (fscanf(InFile, " %*s *%15s %s %*[^\r]", LynxName, LynxVer) != 2) {
fprintf(stderr,"%s: Archive format error\n", ProgName);
return 2;
}
getc(InFile); /* Get CR without killing whitespace */
if (isupper(*LynxVer))
Totals->Version = RomanToDec(LynxVer); /* Lynx */
else
Totals->Version = atoi(LynxVer); /* Ultra-Lynx */
/* Only old versions of Lynx need this FALSE */
/* Ultra-Lynx looks like it always has Version > 10 */
ExpectLastLength = Totals->Version >= 10;
Totals->DearcerBlocks = 0;
break;
default:
return 2; /* wrong archive type */
}
if (fscanf(InFile, "%d%*[^\r]\r", &NumFiles) != 1) {
fprintf(stderr,"%s: Archive format error\n", ProgName);
return 2;
}
DisplayStart(LynxType, NULL);
/******************************************************************************
* Read the archive directory contents
******************************************************************************/
for (; NumFiles--;) {
char EntryName[17];
char FileType[2];
int FileBlocks;
long FileLen = 0;
int ReadCount = fscanf(InFile, "%16[^\r]%*[^\r]", EntryName);
(void) getc(InFile); /* eat the CR here because Sun won't in scanf */
ReadCount += fscanf(InFile, "%d%*[^\r]", &FileBlocks);
(void) getc(InFile);
ReadCount += fscanf(InFile, "%1s%*[^\r]", FileType);
(void) getc(InFile); /* eat the CR without killing whitespace so
ftell() will be correct, below */
if (ReadCount != 3) {
fprintf(stderr,"%s: Archive format error\n", ProgName);
return 2;
}
/******************************************************************************
* Find the exact length of the file.
* For the first n-1 entries (for all n entries in newer Lynx versions, like
* XVII), the length in bytes of the last block of the file is specified.
* For the last entry in older Lynx versions, like IX, we must find out how many
* bytes in the file and subtract everything not belonging to the last file.
* This can give an incorrect result if the file has padding after the last
* file (which would happen if the file was transferred using XMODEM), but
* Lynx thinks the padding is part of the file, too.
* Should check for an error return from filelength()
******************************************************************************/
if (NumFiles || ExpectLastLength) {
int LastBlockSize = 0;
fscanf(InFile, "%d%*[^\r]\r", &LastBlockSize);
FileLen = (long) ((FileBlocks-1) * 254L + LastBlockSize - 1);
} else /* last entry -- calculate based on file size */
FileLen = filelength(fileno(InFile)) - Totals->TotalBlocksNow * 254L -
(((ftell(InFile) - 1) / 254) + 1) * 254L;
DisplayEntry(
ConvertCBMName(EntryName),
FileTypes(FileType[0]),
(long) FileLen,
FileBlocks,
"Stored",
0,
FileBlocks,
-1L
);
++Totals->ArchiveEntries;
Totals->TotalLength += FileLen;
/* The following two values should equal */
Totals->TotalBlocks += (int) ((FileLen-1) / 254 + 1);
Totals->TotalBlocksNow += FileBlocks;
};
return 0;
}
/*---------------------------------------------------------------------------*/
/******************************************************************************
* LHA (SFX) reading routines
******************************************************************************/
struct LHAEntryHeader {
BYTE HeadSize PACK;
BYTE HeadChk PACK;
BYTE HeadID[3] PACK;
BYTE EntryType PACK;
BYTE Magic PACK;
LONG PackSize PACK;
LONG OrigSize PACK;
#if 0 /* avoid ANSI warning because WORD != int */
struct { /* DOS format time */
WORD ft_tsec : 5; /* Two second interval */
WORD ft_min : 6; /* Minutes */
WORD ft_hour : 5; /* Hours */
WORD ft_day : 5; /* Days */
WORD ft_month: 4; /* Months */
WORD ft_year : 7; /* Year */
} FileTime PACK;
#else
LONG DosTime PACK;
#endif
WORD Attr PACK;
BYTE FileNameLen PACK;
/*
* File name is variable length and occurs at the end of the header, so it
* can't be read as part of the header because with a short file name there
* might not be enough file left to read. */
/* BYTE FileName[64] PACK; */
};
struct LHAEntryFileName {
BYTE FileName[64] PACK;
/*
* Checksum is stored after the variable-length filename, but can't be part of
* the struct because it's variable length...
* BYTE ChecksumL PACK;
* BYTE ChecksumH PACK;
*/
};
/* Perform a compile-time check on the size of the struct to ensure that struct
* element packing (with the PACK macro) is working correctly. If the compiler
* complains in the following line with an error like: "invalid array size" or
* "size of array ‘PackStructCompileCheck’ is negative" then fix the PACK macro
* to perform structure packing for your compiler.
* Instead of checking all the packed structs in the program, this one example
* was chosen as a sentinel since it is particularly likely to show problems
* due to its odd-byte alignment of LONG and WORD elements. If the compiler
* errors out on this line, struct alignment is not working on this compiler
* and it must be fixed before the code will work.
*/
#ifndef __SCCZ80
typedef char PackStructCompileCheck[sizeof(struct LHAEntryHeader) == 22 ? 1 : -1];
#endif
/* LHA compression types */
static const char * const LHAEntryTypes[] = {
/* 0 */ "Stored",
/* 1 */ "lh1",
/* 2 */ "lh2",
/* 3 */ "lh3",
/* 4 */ "lh4",
/* 5 */ "lh5",
/* 6 */ "lh6",
/* 7 */ "lh7",
/* 8 */ "lh8",
/* 9 */ "lh9",
/* A */ "lhA",
/* B */ "lhB"
};
static const BYTE MagicLHAEntry[3] = {'-','l','h'};
static const BYTE MagicHeaderLHASFX[10] = {0x97,0x32,0x30,0x2C,0x30,0x3A,0x8B,0xC2,0x28,0x32};
static const BYTE MagicHeaderLHA[3] = {'-','l','h'};
struct LHA_SFX {
WORD StartAddress PACK;
BYTE Filler[4] PACK;
BYTE Magic[sizeof(MagicHeaderLHASFX)] PACK;
};
struct LHA {
BYTE Filler[2] PACK;
BYTE Magic[sizeof(MagicHeaderLHA)] PACK;
};
/******************************************************************************
* Is archive LHA format?
******************************************************************************/
bool IsLHA_SFX(FILE *InFile, const char *FileName)
{
struct LHA_SFX Header;
rewind(InFile);
return ((fread(&Header, sizeof(Header), 1, InFile) == 1)
&& (memcmp(Header.Magic, MagicHeaderLHASFX, sizeof(MagicHeaderLHASFX)) == 0));
}
bool IsLHA(FILE *InFile, const char *FileName)
{
struct LHA Header;
rewind(InFile);
return ((fread(&Header, sizeof(Header), 1, InFile) == 1)
&& (memcmp(Header.Magic, MagicHeaderLHA, sizeof(MagicHeaderLHA)) == 0));
}
/******************************************************************************
* Read directory
******************************************************************************/
int DirLHA(FILE *InFile, enum ArchiveTypes LHAType, struct ArcTotals *Totals,
DisplayStartFunc DisplayStart, DisplayEntryFunc DisplayEntry)
{
long CurrentPos;
Totals->ArchiveEntries = 0;
Totals->TotalBlocks = 0;
Totals->TotalBlocksNow = 0;
Totals->TotalLength = 0;
/******************************************************************************
* Find the version number and first archive entry offset for each format
******************************************************************************/
switch (LHAType) {
case LHA_SFX:
CurrentPos = 0xE89; /* Must be a better way than this */
Totals->Version = 0;
Totals->DearcerBlocks = (int) ((CurrentPos-1) / 254 + 1);
break;
case LHA:
CurrentPos = 0;
Totals->Version = 0;
Totals->DearcerBlocks = 0;
break;
default:
return 2; /* wrong archive type */
}
/******************************************************************************
* Read the archive directory contents
******************************************************************************/
if (fseek(InFile, CurrentPos, SEEK_SET) != 0) {
perror(ProgName);
return 2;
}
DisplayStart(LHAType, NULL);
while (1) {
struct LHAEntryHeader FileHeader;
struct LHAEntryFileName EntryFileName;
char FileName[80]; /* must be > sizeof(EntryFileName) */
if (fread(&FileHeader, sizeof(FileHeader), 1, InFile) != 1)
break;
if (memcmp(FileHeader.HeadID, MagicLHAEntry, sizeof(MagicLHAEntry)) != 0)
break;
/* 2-byte checksum is stored as part of the filename but not counted here */
if (FileHeader.FileNameLen > sizeof(EntryFileName.FileName)-2)
break; /* exceeds limit; probably corrupt */
if (fread(&EntryFileName, FileHeader.FileNameLen+2, 1, InFile) != 1)
break;
memcpy(FileName, EntryFileName.FileName, FileHeader.FileNameLen);
FileName[min(sizeof(FileName)-1, FileHeader.FileNameLen)] = 0;
DisplayEntry(
ConvertCBMName(FileName),
FileTypes(EntryFileName.FileName[FileHeader.FileNameLen-2] ? ' ' : EntryFileName.FileName[FileHeader.FileNameLen-1]),
(long) CF_LE_L(FileHeader.OrigSize),
CF_LE_L(FileHeader.OrigSize) ? (unsigned) ((CF_LE_L(FileHeader.OrigSize)-1) / 254 + 1) : 0,
LHAEntryTypes[FileHeader.EntryType - '0'],
CF_LE_L(FileHeader.OrigSize) ? (int) (100 - (CF_LE_L(FileHeader.PackSize) * 100L / CF_LE_L(FileHeader.OrigSize))) : 100,
CF_LE_L(FileHeader.PackSize) ? (unsigned) ((CF_LE_L(FileHeader.PackSize)-1) / 254 + 1) : 0,
(long) (unsigned) (EntryFileName.FileName[FileHeader.FileNameLen+1] << 8) | EntryFileName.FileName[FileHeader.FileNameLen]
);
CurrentPos += FileHeader.HeadSize + CF_LE_L(FileHeader.PackSize) + 2;
fseek(InFile, CurrentPos, SEEK_SET);
++Totals->ArchiveEntries;
Totals->TotalLength += CF_LE_L(FileHeader.OrigSize);
Totals->TotalBlocks += (int) ((CF_LE_L(FileHeader.OrigSize)-1) / 254 + 1);
Totals->TotalBlocksNow += (int) ((CF_LE_L(FileHeader.PackSize)-1) / 254 + 1);
};
return 0;
}
/*---------------------------------------------------------------------------*/
/******************************************************************************
* T64 reading routines
******************************************************************************/
struct T64Header {
BYTE Magic[32] PACK;
BYTE MinorVersion PACK;
BYTE MajorVersion PACK;
WORD Entries PACK; /* Room for this many files in tape directory */
WORD Used PACK; /* Number of files in archive (sometimes just 0) */
WORD unused PACK;
BYTE TapeName[24] PACK;
};
struct T64EntryHeader {
BYTE EntryType PACK;
BYTE FileType PACK;
WORD StartAddr PACK;
WORD EndAddr PACK;
WORD unused1 PACK;
LONG FileOffset PACK;
LONG unused2 PACK;
BYTE FileName[16] PACK;
};
/* File types in T64 tape archives */
/* At least one archive writing program uses the 1541 file types */
static const char * const T64FileTypes[] = {
/* 0 */ "SEQ",
/* 1 */ "PRG",
/* 2 */ "?2?",
/* 3 */ "?3?",
/* 4 */ "?4?",
/* 5 */ "?5?",
/* 6 */ "?6?",
/* 7 */ "?7?"
};
struct T64 {
BYTE Magic[20] PACK; /* room for terminating NUL */
};
/******************************************************************************
* Is archive T64 format?
******************************************************************************/
bool IsT64(FILE *InFile, const char *FileName)
{
struct T64 Header;
rewind(InFile);
if (fread(&Header, sizeof(Header.Magic) - 1, 1, InFile) != 1)
return 0;
/* Zero terminate just in case */
Header.Magic[sizeof(Header.Magic) - 1] = '\0';
/* Common headers are 'C64 tape image file' and 'C64S tape file' but
* lots of variants exist. The FAQ suggests the following check:
*/
return (strstr((char *) Header.Magic, "C64") != NULL &&
strstr((char *) Header.Magic, "tape") != NULL);
}
/******************************************************************************
* Read directory
******************************************************************************/
int DirT64(FILE *InFile, enum ArchiveTypes ArchiveType, struct ArcTotals *Totals,
DisplayStartFunc DisplayStart, DisplayEntryFunc DisplayEntry)
{
char TapeName[25];
int NumFiles;
struct T64Header Header;
Totals->ArchiveEntries = 0;
Totals->TotalBlocks = 0;
Totals->TotalBlocksNow = 0;
Totals->TotalLength = 0;
Totals->DearcerBlocks = 0;
Totals->Version = 0;
if (fseek(InFile, 0, SEEK_SET) != 0) {
perror(ProgName);
return 2;
}
if (fread(&Header, sizeof(Header), 1, InFile) != 1) {
fprintf(stderr,"%s: Archive format error\n", ProgName);
return 2;
}
memcpy(TapeName, Header.TapeName, sizeof(TapeName)-1);
TapeName[sizeof(TapeName)-1] = '\0';
ConvertCBMName(TapeName);
DisplayStart(ArchiveType, TapeName);
Totals->Version = -(Header.MajorVersion * 10 + Header.MinorVersion);
Totals->ArchiveEntries = CF_LE_W(Header.Used);
/******************************************************************************
* Read the archive directory contents
******************************************************************************/
for (NumFiles = CF_LE_W(Header.Used); NumFiles; --NumFiles) {
struct T64EntryHeader FileHeader;
char FileName[17];
unsigned FileLength;