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dllmain.c
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//TODO: "If PK_CAPS_HIDE is set, the plugin will not show the file type as a packer. This is useful for plugins which are mainly used for creating files, e.g. to create batch files, avi files etc. The file needs to be opened with Ctrl+PgDn in this case, because Enter will launch the associated application."
// ==>altho this would require a second build with different filenames etc - the "gibberish extension"-solution is clumsy, but easier \o/
#define VERSION_NO "v0.10"
#ifdef _WIN32
#define _CRT_SECURE_NO_WARNINGS
#endif
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <sys/stat.h>
#include <time.h>
#ifdef _WIN32
#include <windows.h>
#define DIR_SEPARATOR_STRING "\\"
#define FOPEN_S(a,b,c) fopen_s(&a,b,c)
#else
#include <unistd.h>
#define DIR_SEPARATOR_STRING "/"
#define __stdcall
#define sprintf_s(a,b,...) sprintf(a,__VA_ARGS__)
#define strcpy_s(a,b,c) strcpy(a,c)
#define FOPEN_S(a,b,c) a=fopen(b,c)
#define _strcmpi strcasecmp
typedef char *LPCSTR;
#define _stat stat
#define _ftelli64 ftello
#include <signal.h>
#define DebugBreak() raise(SIGTRAP);
#include <ctype.h>
#define TRUE true
#define FALSE false
#define BOOL bool
#include <stdbool.h>
#include <stdlib.h>
#endif
#if _MSC_VER
#define INLINE __forceinline
#elif defined(__APPLE__)
#define INLINE
#else
#define INLINE static inline
#endif
#include "wcxhead.h"
// This define needs to be before including dosfs.h
#define ATARI_ST_SPECIFIC
#include "dosfs-1.03/dosfs.h"
#include "jacknife.h"
#define STORAGE_BYTES 65536 - sizeof(void *) - sizeof(unsigned short)
typedef struct entrylist_storage_
{
struct entrylist_storage_ *prev;
unsigned short current_offset;
unsigned char data[STORAGE_BYTES];
} ENTRYLIST_STORAGE;
stEntryList entryList;
tArchive* pCurrentArchive;
typedef tArchive* myHANDLE;
DISK_IMAGE_INFO disk_image;
ENTRYLIST_STORAGE *current_storage = NULL;
tProcessDataProc ProcessDataProc;
int current_partition; // TODO: terrible, find some better way!
// The following 2 routines were lifted from https://github.com/greiman/SdFat
// tweaked a bit to suit our needs
typedef struct FatLfn
{
/** UTF-16 length of Long File Name */
//size_t len;
/** Position for sequence number. */
uint8_t seqPos;
/** Flags for base and extension character case and LFN. */
uint8_t flags;
/** Short File Name */
uint8_t sfn[11];
const char *lfn;
} FatLfn_t;
#define FAT_NAME_FREE 0X00; /** name[0] value for entry that is free and no allocated entries follow */
#define FAT_NAME_DELETED 0XE5; /** name[0] value for entry that is free after being "deleted" */
// Directory attribute of volume label.
#define FAT_ATTRIB_LABEL 0x08;
#define FAT_ATTRIB_LONG_NAME 0X0F;
#define FAT_CASE_LC_BASE 0X08; /** Filename base-name is all lower case */
#define FAT_CASE_LC_EXT 0X10; /** Filename extension is all lower case.*/
#define FNAME_FLAG_LOST_CHARS 0X01 /** Derived from a LFN with loss or conversion of characters. */
#define FNAME_FLAG_MIXED_CASE 0X02 /** Base-name or extension has mixed case. */
#define FNAME_FLAG_NEED_LFN (FNAME_FLAG_LOST_CHARS | FNAME_FLAG_MIXED_CASE) /** LFN entries are required for file name. */
#define FNAME_FLAG_LC_BASE FAT_CASE_LC_BASE /** Filename base-name is all lower case */
#define FNAME_FLAG_LC_EXT FAT_CASE_LC_EXT /** Filename extension is all lower case. */
#define DBG_HALT_IF(b) \
if (b) { \
DebugBreak() ; \
}
#define DBG_HALT_MACRO DebugBreak()
#define DBG_WARN_IF(b) \
if (b) { \
printf("%d\n", __LINE__); \
}
//------------------------------------------------------------------------------
// Reserved characters for FAT short 8.3 names.
INLINE BOOL sfnReservedChar(uint8_t c) {
if (c == '"' || c == '|' || c == '[' || c == '\\' || c == ']') {
return TRUE;
}
// *+,./ or :;<=>?
if ((0X2A <= c && c <= 0X2F && c != 0X2D) || (0X3A <= c && c <= 0X3F)) {
return TRUE;
}
// Reserved if not in range (0X20, 0X7F).
return !(0X20 < c && c < 0X7F);
}
BOOL makeSFN(FatLfn_t* fname) {
BOOL is83;
// char c;
uint8_t c;
uint8_t bit = FAT_CASE_LC_BASE;
uint8_t lc = 0;
uint8_t uc = 0;
uint8_t i = 0;
uint8_t in = 7;
const char* dot;
const char *end = fname->lfn + strlen(fname->lfn);
const char* ptr = fname->lfn;
// Assume not zero length.
//DBG_HALT_IF(end == ptr);
if (end == ptr) return FALSE;
// Assume blanks removed from start and end.
DBG_HALT_IF(*ptr == ' ' || *(end - 1) == ' ' || *(end - 1) == '.');
// Blank file short name.
for (uint8_t k = 0; k < 11; k++) {
fname->sfn[k] = ' ';
}
// Not 8.3 if starts with dot.
is83 = *ptr == '.' ? FALSE : TRUE;
// Skip leading dots.
for (; *ptr == '.'; ptr++) {
}
// Find last dot.
for (dot = end - 1; dot > ptr && *dot != '.'; dot--) {
}
for (; ptr < end; ptr++) {
c = *ptr;
if (c == '.' && ptr == dot) {
in = 10; // Max index for full 8.3 name.
i = 8; // Place for extension.
bit = FAT_CASE_LC_EXT; // bit for extension.
} else {
if (sfnReservedChar(c)) {
is83 = FALSE;
// Skip UTF-8 trailing characters.
if ((c & 0XC0) == 0X80) {
continue;
}
c = '_';
}
if (i > in) {
is83 = FALSE;
if (in == 10 || ptr > dot) {
// Done - extension longer than three characters or no extension.
break;
}
// Skip to dot.
ptr = dot - 1;
continue;
}
//if (isLower(c)) {
if (islower(c)) {
c += 'A' - 'a';
lc |= bit;
//} else if (isUpper(c)) {
} else if (isupper(c)) {
uc |= bit;
}
fname->sfn[i++] = c;
if (i < 7) {
fname->seqPos = i;
}
}
}
if (fname->sfn[0] == ' ') {
DBG_HALT_MACRO;
{
int debug_halt = 0;
}
goto fail;
}
if (is83) {
fname->flags = (lc & uc) ? FNAME_FLAG_MIXED_CASE : lc;
} else {
fname->flags = FNAME_FLAG_LOST_CHARS;
fname->sfn[fname->seqPos] = '~';
fname->sfn[fname->seqPos + 1] = '1';
}
return TRUE;
fail:
return FALSE;
}
// ggn: Unsure if we'll go so deep into this. Generally, people shouldn't use long filenames.
// For now we'll probably hammer a "~1" in the filename and hope people don't try to abuse this too much
// (another reason for punting on this for now is that we'll have to (re)scan the current directory listing
// to ensure no collision happens
//typedef struct {
// uint8_t name[11];
// uint8_t attributes;
// uint8_t caseFlags;
// uint8_t createTimeMs;
// uint8_t createTime[2];
// uint8_t createDate[2];
// uint8_t accessDate[2];
// uint8_t firstClusterHigh[2];
// uint8_t modifyTime[2];
// uint8_t modifyDate[2];
// uint8_t firstClusterLow[2];
// uint8_t fileSize[4];
//} DirFat_t;
//BOOL makeUniqueSfn(FatLfn_t* fname) {
// const uint8_t FIRST_HASH_SEQ = 2; // min value is 2
// uint8_t pos = fname->seqPos;
// DirFat_t* dir;
// uint16_t hex = 0;
//
// DBG_HALT_IF(!(fname->flags & FNAME_FLAG_LOST_CHARS));
// DBG_HALT_IF(fname->sfn[pos] != '~' && fname->sfn[pos + 1] != '1');
//
// for (uint8_t seq = FIRST_HASH_SEQ; seq < 100; seq++) {
// DBG_WARN_IF(seq > FIRST_HASH_SEQ);
// hex += millis();
// if (pos > 3) {
// // Make space in name for ~HHHH.
// pos = 3;
// }
// for (uint8_t i = pos + 4; i > pos; i--) {
// uint8_t h = hex & 0XF;
// fname->sfn[i] = h < 10 ? h + '0' : h + 'A' - 10;
// hex >>= 4;
// }
// fname->sfn[pos] = '~';
// rewind();
// while (1) {
// dir = readDirCache(TRUE);
// if (!dir) {
// if (!getError()) {
// // At EOF and name not found if no error.
// goto done;
// }
// DBG_FAIL_MACRO;
// goto fail;
// }
// if (dir->name[0] == FAT_NAME_FREE) {
// goto done;
// }
// if (isFatFileOrSubdir(dir) && !memcmp(fname->sfn, dir->name, 11)) {
// // Name found - try another.
// break;
// }
// }
// }
// // fall inti fail - too many tries.
// DBG_FAIL_MACRO;
//
// fail:
// return FALSE;
//
// done:
// return TRUE;
//}
//unpack MSA into a newly created buffer
uint8_t *unpack_msa(tArchive *arch, uint8_t *packedMsa, int packedSize)
{
int sectors = ((int)packedMsa[2] << 8) | ((int)packedMsa[3]);
int sides = (((int)packedMsa[4] << 8) | ((int)packedMsa[5])) + 1;
int startTrack = ((int)packedMsa[6] << 8) | ((int)packedMsa[7]);
int endTrack = (((int)packedMsa[8] << 8) | ((int)packedMsa[9])) + 1;
//just ignore partial disk images, skipping tracks would skip bpb/fat, too
if (startTrack != 0 || endTrack == 0) {
return NULL;
}
int unpackedSize = sectors * 512 * sides * endTrack;
disk_image.image_sectors = sectors;
disk_image.image_sides = sides;
disk_image.image_tracks = endTrack;
uint8_t *unpackedData = (uint8_t *)malloc(unpackedSize);
if (!unpackedData) return 0;
int offset = 10;
int out = 0;
for (int i = 0; i < endTrack * sides; i++) {
int trackLen = packedMsa[offset++];
trackLen <<= 8;
trackLen += packedMsa[offset++];
if (trackLen != 512 * sectors) {
for (; trackLen > 0; trackLen--) {
unpackedData[out++] = packedMsa[offset++];
// Bounds check against corrupt MSA images
if (out > unpackedSize || offset > packedSize)
{
free(unpackedData);
return 0;
}
if (unpackedData[out - 1] == 0xe5) {
// Bounds check against corrupt MSA images
if (offset + 4 - 1 > packedSize)
{
free(unpackedData);
return 0;
}
uint8_t data = packedMsa[offset++];
unsigned int runLen = packedMsa[offset++];
runLen <<= 8;
runLen += packedMsa[offset++];
trackLen -= 3;
out--;
for (unsigned int ii = 0; ii < runLen && out < unpackedSize; ii++) {
unpackedData[out++] = data;
}
}
}
}
else {
// Bounds check against corrupt MSA images
if (out + trackLen > unpackedSize || offset + trackLen > packedSize)
{
free(unpackedData);
return 0;
}
for (; trackLen > 0; trackLen--) {
unpackedData[out++] = packedMsa[offset++];
}
}
}
disk_image.file_size = unpackedSize;
return unpackedData;
}
BOOL guess_size(int size)
{
if (size % 512) {
return FALSE;
}
int tracks, sectors;
int start_sectors = 11;
// If our image is greater than 1mb, then it's a HD image. Not the best way to detect
// HD disks in general, but it should hold
if (size > 83 * 11 * 512 * 2)
{
start_sectors = 21;
}
for (tracks = 86; tracks > 0; tracks--) {
for (sectors = start_sectors; sectors >= start_sectors - 3; sectors--) {
if (!(size % tracks)) {
if ((size % (tracks * sectors * 2 * 512)) == 0) {
disk_image.image_tracks = tracks;
disk_image.image_sides = 2;
disk_image.image_sectors = sectors;
return TRUE;
}
else if ((size % (tracks * sectors * 1 * 512)) == 0) {
disk_image.image_tracks = tracks;
disk_image.image_sides = 1;
disk_image.image_sectors = sectors;
return TRUE;
}
}
}
}
return FALSE;
}
#define BYTE_SWAP_WORD(a) ((unsigned short)(a>>8)|(unsigned short)(a<<8))
BOOL dim_copy_sector_or_fill_with_blank(int fat_entry, void *s, void *d, int cluster_size, int bytes_left)
{
if (fat_entry == 0 || (fat_entry >= 0xff0 && fat_entry <= 0xff7) || bytes_left <= 0)
{
return FALSE;
}
if (bytes_left >= cluster_size)
{
memcpy(d, s, cluster_size);
}
else
{
// Yes, there are .dim files that are truncated at the end
memcpy(d, s, bytes_left);
}
return TRUE;
}
unsigned char *expand_dim(BOOL fastcopy_header)
{
unsigned char *s = disk_image.buffer;
unsigned short total_clusters;
int total_filesystem_sectors;
int total_disk_sectors;
unsigned short cluster_size;
int bytes_left;
if (fastcopy_header)
{
FCOPY_HEADER *h = (FCOPY_HEADER *)s;
s += 32;
cluster_size = BYTE_SWAP_WORD(h->cluster_size);
total_clusters = BYTE_SWAP_WORD(h->total_clusters);
total_filesystem_sectors = BYTE_SWAP_WORD(h->total_filesystem_sectors);
total_disk_sectors = disk_image.image_tracks * disk_image.image_sectors * disk_image.image_sides;
bytes_left = (int)(disk_image.file_size - total_filesystem_sectors * 512); // h->sector_size ????
bytes_left -= 32;
}
else
{
// TODO sanitise all the following, because it is very likely for things to start exploding
// as there's no header for ECopy images. Perhaps it makes sense to call DFS_GetVolInfo
// instead of writing the short version of that here
PLBR lbr = (PLBR)(s);
cluster_size = lbr->bpb.SPC * ((lbr->bpb.BPS_h << 8) + (lbr->bpb.BPS_l));
total_disk_sectors = (lbr->bpb.NSECTS_l) | (lbr->bpb.NSECTS_h << 8);
total_filesystem_sectors= (lbr->bpb.SPF_h<<8) | (lbr->bpb.SPF_l);
total_clusters= total_disk_sectors / lbr->bpb.SPC;
bytes_left= (int)(disk_image.file_size - ((lbr->bpb.SPF_h<<8)|(lbr->bpb.SPF_l)) * 512);
//bytes_left -= 2;
disk_image.image_sectors = (lbr->bpb.SPT_h << 8) | (lbr->bpb.SPT_l);
disk_image.image_sides=(lbr->bpb.NSIDES_h<<8)|(lbr->bpb.NSIDES_l);
disk_image.image_tracks = total_disk_sectors / disk_image.image_sectors / disk_image.image_sides;
}
unsigned char *buf = (unsigned char *)calloc(1, total_disk_sectors * 512);
if (!buf) return 0;
unsigned char *d = buf;
memcpy(d, s, total_filesystem_sectors * 512);
s += total_filesystem_sectors * 512;
d += total_filesystem_sectors * 512;
unsigned char *fat1 = disk_image.buffer + 512 + 32 + 3; // TODO: A bit hardcoded, but eh
for (int i = 0; i < total_clusters / 2; i++)
{
BOOL ret;
// Check "even" entry in a FAT12 record
int fat_entry = ((fat1[1] & 0xf) << 8) | fat1[0];
ret = dim_copy_sector_or_fill_with_blank(fat_entry, s, d, cluster_size, bytes_left);
d += cluster_size;
if (ret)
{
s += cluster_size;
bytes_left -= cluster_size;
}
// Check "odd" entry in a FAT12 record
fat_entry = (fat1[2] << 4) | (fat1[1] >> 4);
ret = dim_copy_sector_or_fill_with_blank(fat_entry, s, d, cluster_size, bytes_left);
d += cluster_size;
if (ret)
{
s += cluster_size;
bytes_left -= cluster_size;
}
// Advance through 2 FAT12 entries
fat1 += 3;
}
return buf;
}
/*
Attach emulation to a host-side disk image file
Returns 0 OK, nonzero for any error
*/
uint32_t DFS_HostAttach(tArchive *arch)
{
disk_image.image_opened_read_only = FALSE;
disk_image.file_handle = fopen(arch->archname, "r+b");
if (disk_image.file_handle == NULL)
{
// Maybe the image is write protected, try to open read only
disk_image.file_handle = fopen(arch->archname, "rb");
if (disk_image.file_handle == NULL)
{
return J_FILE_NOT_FOUND;
}
disk_image.image_opened_read_only = TRUE;
}
fseek(disk_image.file_handle, 0, SEEK_END);
disk_image.file_size = _ftelli64(disk_image.file_handle);
fseek(disk_image.file_handle, 0, SEEK_SET);
disk_image.disk_geometry_does_not_match_bpb = FALSE;
disk_image.mode = DISKMODE_HARD_DISK;
if (disk_image.file_size > 2880 * 1024)
{
// Hard disk image, we'll do everything in-place inside the file
return J_OK;
}
// Definitely a floppy disk image, let's cache it into RAM
disk_image.buffer = (uint8_t *)malloc((size_t)disk_image.file_size);
if (!disk_image.buffer)
{
return J_MALLOC_ERROR;
}
if (!fread(disk_image.buffer, (size_t)disk_image.file_size, 1, disk_image.file_handle))
{
fclose(disk_image.file_handle);
return -1;
}
fclose(disk_image.file_handle);
// Try to figure out what kind of image we got here. We first assume it's just a sector dump (.ST)
// and then we scan for MSA and FastCopy DIM headers. If we detect either, go do some extra stuff
disk_image.mode = DISKMODE_LINEAR;
if ((disk_image.buffer[0] == 0xe && disk_image.buffer[1] == 0xf) ||
(disk_image.buffer[0] == 0x0 && disk_image.buffer[1] == 0x0 && strlen(arch->archname) > 4 && _strcmpi(arch->archname + strlen(arch->archname) - 4, ".msa") == 0))
{
// MSA image, unpack it to a flat buffer
disk_image.mode = DISKMODE_MSA;
uint8_t *unpacked_msa = unpack_msa(arch, disk_image.buffer, (int)disk_image.file_size);
free(disk_image.buffer);
if (!unpacked_msa)
{
return J_INVALID_MSA;
}
disk_image.buffer = unpacked_msa;
}
else if (*(unsigned short *)disk_image.buffer == 0x4242) // "BB"
{
// Fastcopy DIM image, unpack it to flat buffer if needed
FCOPY_HEADER *h = (FCOPY_HEADER *)disk_image.buffer;
if (h->start_track)
{
// Nope, we don't support partial images
return J_INVALID_DIM;
}
if (h->disk_configuration_present)
{
disk_image.image_sectors = h->sectors;
disk_image.image_sides = h->sides + 1;
disk_image.image_tracks = h->end_track + 1;
if (h->get_sectors)
{
// Disk was imaged with "Get sectors" on, so we need to
// expand the image to fill in the non-imaged sectors with blanks
disk_image.mode = DISKMODE_FCOPY_CONF_USED_SECTORS;
uint8_t *expanded = expand_dim(TRUE);
if (!expanded)
{
return J_INVALID_DIM;
}
free(disk_image.buffer);
disk_image.buffer = expanded;
}
else
{
// No problem, just skip past the FCopy header and treat it as a normal .ST disk
disk_image.mode = DISKMODE_FCOPY_CONF_ALL_SECTORS;
disk_image.buffer += 32;
}
}
else
{
disk_image.mode = DISKMODE_FCOPY_NO_CONF;
disk_image.buffer += 32;
}
}
else if (disk_image.buffer[0] == 0xeb && disk_image.buffer[1] == 0x3c && disk_image.buffer[2] == 0x90)
{
// Maybe ECopy? Definitely needs unpacking to flat buffer
// TODO the header we are testing currently is for MS DOS 5.00 boot sector, so we should get rid of it.
// Definitely after add sanitising expand_dim though - feeding random images to it can cause so many crashes.
uint8_t *expanded = expand_dim(FALSE);
if (!expanded)
{
return J_INVALID_DIM;
}
free(disk_image.buffer);
disk_image.buffer = expanded;
}
else if (!guess_size((int)disk_image.file_size))
{
free(disk_image.buffer);
return J_INVALID_DIM;
}
return J_OK;
}
// For reasons explained in DFS_GetVolInfo, the image's geometry can be different than what
// the BPB reports. When we detect such a case we need to translate the requested sector
// from the "logical" geometry to the "physical" one. Basically we convert the sector to
// track/sector/side and then convert it back to a sector count using the detected disk geometry.
uint32_t recalculate_sector(uint32_t sector)
{
uint32_t requested_track = sector / disk_image.bpb_sectors_per_track / disk_image.bpb_sides;
uint32_t requested_side = (sector % (disk_image.bpb_sectors_per_track * disk_image.bpb_sides)) / disk_image.bpb_sectors_per_track;
uint32_t requested_sector = sector % disk_image.bpb_sectors_per_track;
return requested_track * disk_image.image_sectors * disk_image.image_sides +
requested_side * disk_image.image_sectors +
requested_sector;
}
/*
Read sector from image
Returns 0 OK, nonzero for any error
*/
int DFS_HostReadSector(uint8_t *buffer, uint32_t sector, uint32_t count)
{
if (disk_image.disk_geometry_does_not_match_bpb)
{
// Wonky disk image detected, let's recalculate the requested sector
sector = recalculate_sector(sector);
assert(count == 1); // Leave this here just to remind us that anything if count>1 it could mean Very Bad Things(tm)
}
// fseek into an opened for writing file can extend the file on Windows and won't fail, so let's check bounds
if ((int)(sector * SECTOR_SIZE) > disk_image.file_size)
{
return -1;
}
if (disk_image.mode != DISKMODE_HARD_DISK)
{
// It's cached in ram, so let's not hit the disk
memcpy(buffer, &disk_image.buffer[sector * SECTOR_SIZE], SECTOR_SIZE);
return 0;
}
else
{
// TODO: what in the world is this abomination of a test? Simplify
if (current_partition!=-1 && disk_image.partition_info[current_partition].partition_defined && (sector<disk_image.partition_info[current_partition].start_sector || sector>disk_image.partition_info[current_partition].start_sector + disk_image.partition_info[current_partition].total_sectors))
{
return -1;
}
if (fseek(disk_image.file_handle, sector * SECTOR_SIZE, SEEK_SET))
{
return -1;
}
fread(buffer, SECTOR_SIZE, count, disk_image.file_handle);
return 0;
}
}
uint32_t DFS_ReadSector(uint8_t unit, uint8_t *buffer, uint32_t sector, uint32_t count)
{
return DFS_HostReadSector(buffer, sector, count);
}
/*
Write sector to image
Returns 0 OK, nonzero for any error
*/
int DFS_HostWriteSector(uint8_t *buffer, uint32_t sector, uint32_t count)
{
if (disk_image.image_opened_read_only) return -1;
if (disk_image.disk_geometry_does_not_match_bpb)
{
// Wonky disk image detected, let's recalculate the requested sector
sector = recalculate_sector(sector);
assert(count == 1); // Leave this here just to remind us that anything if count>1 it could mean Very Bad Things(tm)
}
// fseek into an opened for writing file can extend the file on Windows and won't fail, so let's check bounds
if ((int)(sector * SECTOR_SIZE) > disk_image.file_size)
{
return -1;
}
// It's cached in ram, so let's not hit the disk
if (disk_image.mode != DISKMODE_HARD_DISK)
{
if (sector > disk_image.file_size/512)
{
return -1;
}
memcpy(&disk_image.buffer[sector * SECTOR_SIZE], buffer, SECTOR_SIZE);
return 0;
}
else
{
// TODO: what in the world is this abomination of a test? Simplify
if (current_partition != -1 && disk_image.partition_info[current_partition].partition_defined && (sector<disk_image.partition_info[current_partition].start_sector || sector>disk_image.partition_info[current_partition].start_sector + disk_image.partition_info[current_partition].total_sectors))
{
return -1;
}
if (fseek(disk_image.file_handle, sector * SECTOR_SIZE, SEEK_SET))
{
return -1;
}
fwrite(buffer, SECTOR_SIZE, count, disk_image.file_handle);
fflush(disk_image.file_handle);
return 0;
}
}
uint32_t DFS_WriteSector(uint8_t unit, uint8_t *buffer, uint32_t sector, uint32_t count)
{
return DFS_HostWriteSector(buffer, sector, count);
}
// try to pack a chunk of data in MSA RLE format
// returns packed size or -1 if packing was unsuccessful
static int pack_track(unsigned char *dest, const unsigned char *src, int len) {
int pklen = 0;
const unsigned char *p = (const unsigned char *)src, *src_end = (const unsigned char *)src + len;
while (p < src_end) {
const unsigned char *prev = p;
unsigned int pkv = *p++;
while (p < src_end && *p == pkv) p++;
int n = (int)(p - prev);
if ((n >= 4 || pkv == 0xE5) && pklen + 4 < len) {
*dest++ = 0xE5;
*dest++ = pkv;
*dest++ = n >> 8;
*dest++ = n;
pklen += 4;
}
else if (pklen + n < len) {
int i;
for (i = 0; i < n; ++i) *dest++ = pkv;
pklen += n;
}
else {
return -1;
}
}
return pklen;
}
uint8_t *make_msa(tArchive *arch)
{
// Write MSA header
int sectors = disk_image.image_sectors;
int sides = disk_image.image_sides;
int start_track = 0;
int end_track = disk_image.image_tracks - 1;
unsigned char *packed_buffer = (unsigned char *)malloc(10 + end_track * (sectors * SECTOR_SIZE + 2) * sides + 100000); // 10=header size, +2 bytes per track for writing the track size
if (!packed_buffer) return 0;
unsigned char *pack = packed_buffer;
*(unsigned short *)(pack + 0) = 0x0f0e;
*(unsigned short *)(pack + 2) = ((unsigned short)( sectors << 8)) | ((unsigned short)( sectors >> 8));
*(unsigned short *)(pack + 4) = ((unsigned short)((sides - 1) << 8)) | ((unsigned short)((sides - 1) >> 8));
*(unsigned short *)(pack + 6) = 0; // Start track will always be 0
*(unsigned short *)(pack + 8) = ((unsigned short)( end_track << 8)) | ((unsigned short)( end_track >> 8));
pack += 10;
int track;
unsigned char *p = disk_image.buffer;
for (track = 0; track < end_track + 1; ++track) {
int side;
for (side = 0; side < sides; ++side) {
// try to compress the track
int pklen = pack_track(pack + 2, p, sectors * 512);
if (pklen < 0) {
// compression failed, writing uncompressed
*(unsigned short *)(pack) = (unsigned short)((sectors * SECTOR_SIZE) >> 8) | (unsigned short)((sectors * SECTOR_SIZE) << 8);
memcpy(pack + 2, p, sectors * 512);
pack += 2 + SECTOR_SIZE * sectors;
}
else {
// write the compressed data
*(unsigned short *)(pack) = (unsigned short)(pklen >> 8) | (unsigned short)(pklen << 8);
pack += 2 + pklen;
}
p += sectors * 512;
}
}
disk_image.file_size = (int)(pack - packed_buffer);
return packed_buffer;
}
int DFS_HostDetach(tArchive *arch)
{
if (disk_image.mode == DISKMODE_HARD_DISK)
{
// Just close the file, we're done
if (!disk_image.file_handle) return -1;
return fclose(disk_image.file_handle);
}
if (disk_image.mode == DISKMODE_FCOPY_CONF_ALL_SECTORS || disk_image.mode == DISKMODE_FCOPY_NO_CONF)
{
// Rewind pointer here because we might want to free it
disk_image.buffer -= 32;
}
// Floppy image, we have some work to do
if (!arch->volume_dirty)
{
// Only try to save the image to disk if we actually modified it
// If we performed a file operation (add files, new folder, etc)
// and it failed, then we don't update the image to disk
free(disk_image.buffer);
return 0;
}
if (disk_image.mode == DISKMODE_MSA)
{
uint8_t *packed_msa = make_msa(arch);
if (!packed_msa)
{
free(disk_image.buffer);
return -1;
}
free(disk_image.buffer);
disk_image.buffer = packed_msa;
}
if (disk_image.mode == DISKMODE_FCOPY_CONF_ALL_SECTORS || disk_image.mode == DISKMODE_FCOPY_CONF_USED_SECTORS)
{
// Eventually here we'll just add some code to write a .dim file using "all sectors",
// unless someone reeeeeeeeally asks for "used sectors" format it's not happening
}
if (disk_image.mode == DISKMODE_FCOPY_NO_CONF)
{
// Unsure if the implementation is different here, it might be merged with the above block
}
disk_image.file_handle = fopen(arch->archname, "wb");
if (!disk_image.file_handle)
{
return -1;
}
fwrite(disk_image.buffer, (size_t)disk_image.file_size, 1, disk_image.file_handle);
free(disk_image.buffer);
fclose(disk_image.file_handle);
return 0;
}
stEntryList* findLastEntry() {
stEntryList* entry = &entryList;
while (entry->next != NULL) {
entry = entry->next;
}
return entry;
}
// In some parts of the code we get a filename in "directory format", i.e.
// something like "FILE EXT". This routine converts this to a "canonical"
// filename, i.e. "FILE.EXT"
void dir_to_canonical(char dest[13], uint8_t *src)
{
BOOL added_dot = FALSE;
for (int i = 0; i < 11; i++)
{
if (*src == ' ')
{
do
{
src++;
i++;
if (i == 11)
{
*dest = 0;
return;
}
} while (*src == ' ');
*dest++ = '.';
added_dot = TRUE;
}
*dest++ = *src++;
if (i == 7 && !added_dot && *src!=' ') *dest++ = '.';
}
*dest = 0;
}
stEntryList *new_EntryList()
{
if (!current_storage)
{
// First time run, allocate a chunk
current_storage = (ENTRYLIST_STORAGE *)malloc(65536);
if (!current_storage)
{
return NULL;
}
current_storage->prev = NULL;
current_storage->current_offset = 0;
}
if (current_storage->current_offset + sizeof(stEntryList)>STORAGE_BYTES)
{
ENTRYLIST_STORAGE *temp = current_storage;
current_storage = (ENTRYLIST_STORAGE *)malloc(65536);
if (!current_storage)
{
return NULL;
}
current_storage->prev = temp;
current_storage->current_offset = 0;
}
uint16_t offset = current_storage->current_offset;
current_storage->current_offset += sizeof(stEntryList);
return (stEntryList *)¤t_storage->data[offset];
}
uint32_t scan_files(char *path, VOLINFO *vi, char *partition_prefix)
{
uint32_t ret;
int i;
DIRINFO di;
char filename_canonical[13];
uint8_t *scratch_sector = (uint8_t *)malloc(SECTOR_SIZE);
if (!scratch_sector) return DFS_ERRMISC;
di.scratch = scratch_sector;
stEntryList *lastEntry;
ret = DFS_OpenDir(vi, (uint8_t *)path, &di);
if (ret == DFS_OK) {
i = (int)strlen(path);
for (;;) {
lastEntry = findLastEntry();
ret = DFS_GetNext(vi, &di, &(*lastEntry).de);
if (ret != DFS_OK) break;
if (lastEntry->de.name[0] == 0) continue;
dir_to_canonical(filename_canonical, lastEntry->de.name);
if (strcmp(filename_canonical, ".") == 0) continue;
if (strcmp(filename_canonical, "..") == 0) continue;
//if (strlen(lastEntry->de.name) > 12)
//{
// // Invalid filename, mark it as illegal
// strcpy(lastEntry->de.name, "ILLEGAL");
//}
if (lastEntry->de.attr & ATTR_VOLUME_ID) {
strcpy((char *)vi->label, filename_canonical);
continue;
}
if (lastEntry->de.attr & ATTR_DIRECTORY) {
//if we exceed MAX_PATH this image has a serious problem, so better bail out
if (strlen(path) + strlen(filename_canonical) + 1 >= MAX_PATH ||
sprintf_s((char *)lastEntry->fileWPath, MAX_PATH, "%s%s%s" DIR_SEPARATOR_STRING, partition_prefix, path, filename_canonical) == -1) {
ret = J_PATHNAME_TOO_LARGE;
break;
}
if (i + strlen((char *)lastEntry->de.name) + 1 >= MAX_PATH ||
sprintf_s(&path[i], MAX_PATH - i, "%s" DIR_SEPARATOR_STRING, filename_canonical) == -1) {
ret = J_PATHNAME_TOO_LARGE;
break;
}
stEntryList *new_item = new_EntryList();
if (!new_item)
{
ret = J_MEMORY_ALLOCATION_ERROR;
break;
}
lastEntry->next = new_item;
lastEntry->next->prev = lastEntry;
lastEntry->next->next = NULL;
lastEntry = new_item;
ret = scan_files(path, vi, partition_prefix);
if (ret != DFS_OK && ret != DFS_EOF)
{
break;
}
path[i] = 0;
}
else {
//if we exceed MAX_PATH this image has a serious problem, so better bail out