438 lines
13 KiB
C
438 lines
13 KiB
C
#define _POSIX_C_SOURCE 2
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#include "lzw.h"
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define MAGIC_DSK_OLD 0x58aa
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#define MAGIC_DSK_UNCOMPRESSED 0x59aa
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#define MAGIC_DSK_COMPRESSED 0x5aaa
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#if defined(__DOS__) || defined(__WINDOWS__) || defined(__NT__) || defined(__OS2__)
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#define DOSLIKE
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#define DIRSEP '\\'
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#else
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#undef DOSLIKE
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#define DIRSEP '/'
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#endif
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#pragma pack(1)
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struct dskheader {
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uint16_t magic; /* magic identifier (0x58aa, 0x59aa or 0x5aaa) */
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uint16_t mediatype; /* disk media type as defined in the first byte of the FAT */
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uint16_t sectorsize; /* sector size in bytes */
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uint8_t clustermask; /* number of sectors per cluster minus one */
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uint8_t clustershift; /* log2(cluster size / sector size) */
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uint16_t reservedsectors; /* number of reserved sectors at the start of the disk */
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uint8_t fatcopies; /* number of copies of the FAT */
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uint16_t rootentries; /* max number of entries in the root directory */
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uint16_t firstclustersector; /* count of sectors for boot sector + FATs + root dir */
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uint16_t imageclusters; /* number of clusters in the image (empty clusters at the end are not saved) */
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uint8_t sectorsperfat; /* size of each FAT copy in sectors */
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uint16_t rootdirsector; /* count of sectors used by boot sector + FATs */
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uint32_t checksum; /* sum of all words in the image */
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uint16_t cylinders; /* number of disk cylinders (40 or 80) */
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uint16_t heads; /* number of disk heads (sides, 1 or 2) */
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uint16_t sectors; /* number of sectors per track */
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uint32_t unused;
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uint16_t imagesectors; /* number of sectors in the image */
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uint16_t commentoffset; /* offset of the image comment string */
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uint16_t firstoffset; /* offset of the start of image contents */
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};
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#pragma pack()
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const struct media_type {
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int sectorsize;
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int cylinders;
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int heads;
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int sectors;
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char* name;
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} media_types[] = {
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{ 512, 80, 2, 36, "3.5\" DSED 2.88MB" },
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{ 512, 80, 2, 18, "3.5\" DSHD 1.44MB" },
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{ 512, 80, 2, 9, "3.5\" DSDD 720KB" },
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{ 512, 80, 2, 15, "5.25\" DSHD 1.2MB" },
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{ 512, 40, 1, 8, "5.25\" SSDD 160KB" },
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{ 512, 40, 1, 9, "5.25\" SSDD 180KB" },
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{ 512, 40, 2, 8, "5.25\" DSDD 320KB" },
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{ 512, 40, 2, 9, "5.25\" DSDD 360KB" },
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{ 512, 80, 1, 8, "5.25\" SSQD 320KB" },
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{ 512, 80, 2, 8, "5.25\" DSQD 640KB" },
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{ 512, 80, 1, 8, "3.5\" SSDD 320KB" },
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{ 512, 80, 1, 9, "3.5\" SSDD 360KB" },
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{ 512, 80, 2, 8, "3.5\" DSDD 640KB" },
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{ 512, 80, 2, 21, "3.5\" DSHD 1.68MB DMF" },
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{ 512, 80, 2, 21, "3.5\" DSHD 1.72MB DMF" },
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{ -1, -1, -1, -1, "Unknown" }
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};
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char* guess_output_filename(const char* input_filename, int is_compressed)
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{
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char* outname;
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unsigned int ifnlen, ofnlen;
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int i;
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/* NOLINTBEGIN(clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling) */
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ifnlen = strlen(input_filename);
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ofnlen = ifnlen + 9;
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outname = (char*)malloc(ofnlen);
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strncpy(outname, input_filename, ofnlen);
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/* strip extension */
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for (i = ifnlen; i > 0; i--) {
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if (outname[i - 1] == '.') {
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outname[i - 1] = '\0';
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break;
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} else if (outname[i - 1] == DIRSEP)
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break;
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}
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#ifdef DOSLIKE
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if (is_compressed) /* use filename.lzw instead of filename.img.lzw on dos and win */
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strcat(outname, ".lzw");
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else
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strcat(outname, ".img");
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#else
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strncat(outname, ".img", ofnlen);
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if (is_compressed)
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strncat(outname, ".lzw", ofnlen);
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#endif
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/* NOLINTEND(clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling) */
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return outname;
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}
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void pad_file_to_size(FILE* f, unsigned long size)
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{
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long r;
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unsigned long current_pos;
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r = ftell(f);
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if (r < 0) {
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perror("ftell()");
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}
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current_pos = r;
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if (current_pos > size)
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printf("ERROR: output file is larger than expected! (%lu vs %lu)\n", current_pos, size);
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if (current_pos < size - 1) {
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long pos;
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pos = ((long)size) - 1;
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fseek(f, pos, SEEK_SET);
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}
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if (current_pos < size)
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fputc(0, f);
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}
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int valid_header(const struct dskheader* h)
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{
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unsigned int final_sectors;
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unsigned long int final_bytes;
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if (!(h->magic == MAGIC_DSK_COMPRESSED || h->magic == MAGIC_DSK_UNCOMPRESSED || h->magic == MAGIC_DSK_OLD))
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return 0;
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if (h->cylinders < 40 || h->cylinders > 80)
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return 0;
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if (h->heads == 0 || h->heads > 2)
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return 0;
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if (h->sectors < 8 || h->sectors > 36)
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return 0;
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/* reasonable floppy sector sizes are powers of two between 128 and 1024 */
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if (h->sectorsize < 128 || h->sectorsize > 1024 || (h->sectorsize & (h->sectorsize - 1)) != 0)
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return 0;
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final_sectors = h->cylinders * h->heads * h->sectors;
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final_bytes = final_sectors * h->sectorsize;
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if (final_bytes > 4000000UL)
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return 0;
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if ((h->clustershift > 7) || (h->clustermask != (1UL << h->clustershift) - 1))
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return 0;
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if (h->reservedsectors + h->fatcopies * h->sectorsperfat != h->rootdirsector)
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return 0;
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if (h->firstclustersector - 1 + (h->imageclusters << h->clustershift) != final_sectors)
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return 0;
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if (h->firstclustersector != h->reservedsectors + h->fatcopies * h->sectorsperfat + h->rootentries * 32 / h->sectorsize)
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return 0;
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if (h->imagesectors > final_sectors)
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return 0;
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if (h->commentoffset < sizeof(struct dskheader) || h->firstoffset <= h->commentoffset)
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return 0;
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return 1;
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}
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#if 0
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void dump_dsk_header(struct dskheader* h)
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{
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printf("=== header =====================================\n");
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printf("magic: 0x%04x\n", h->magic);
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printf("media type: 0x%04x\n", h->mediatype);
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printf("sectorsize: %d\n", h->sectorsize);
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printf("clustermask: %d\n", h->clustermask);
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printf("clustershift: %d\n", h->clustershift);
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printf("reservedsectors: %d\n", h->reservedsectors);
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printf("fatcopies: %d\n", h->fatcopies);
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printf("rootentries: %d\n", h->rootentries);
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printf("firstclustersector: %d\n", h->firstclustersector);
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printf("imageclusters: %d\n", h->imageclusters);
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printf("sectorsperfat: %d\n", h->sectorsperfat);
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printf("rootdirsector: %d\n", h->rootdirsector);
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printf("checksum: 0x%08x\n", h->checksum);
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printf("cylinders: %d\n", h->cylinders);
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printf("heads: %d\n", h->heads);
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printf("sectors: %d\n", h->sectors);
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printf("unused: 0x%08x\n", h->unused);
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printf("imagesectors: %d\n", h->imagesectors);
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printf("commentoffset: %d\n", h->commentoffset);
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printf("firstoffset: %d\n", h->firstoffset);
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printf("================================================\n");
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}
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#endif
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void dsk2img(const char* filename, int no_lzw)
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{
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FILE *inf, *outf;
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struct dskheader header;
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char comment[600];
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char *c, *outname;
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unsigned long rres;
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int sres;
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unsigned long int final_sectors, image_sectors, sector;
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unsigned long int final_size;
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long int start_offset;
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uint8_t* buffer;
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uint32_t checksum;
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int i;
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int type_geom;
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char *rbuf = NULL, *wbuf = NULL;
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inf = fopen(filename, "rb");
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if (inf == NULL)
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return;
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rbuf = (char*)malloc(4096);
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if (rbuf)
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setvbuf(inf, rbuf, _IOFBF, 4096);
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else
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printf("WARNING: can't allocate read buffer.");
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rres = fread(&header, sizeof(header), 1, inf);
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if (rres != 1) {
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printf("Short read\n");
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fclose(inf);
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if (rbuf)
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free(rbuf);
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return;
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}
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/* dump_dsk_header(&header); */
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if (!valid_header(&header)) {
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fclose(inf);
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puts("Not a valid DSK file!");
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if (rbuf)
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free(rbuf);
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return;
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}
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final_sectors = header.cylinders * header.heads * header.sectors;
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final_size = final_sectors * header.sectorsize;
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printf("DSK format: ");
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switch (header.magic) {
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case MAGIC_DSK_OLD:
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puts("Old");
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break;
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case MAGIC_DSK_UNCOMPRESSED:
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puts("Regular");
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break;
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case MAGIC_DSK_COMPRESSED:
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puts("Compressed");
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break;
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default:
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puts("Unknown");
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}
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for (type_geom = 0; media_types[type_geom].sectors > 0; type_geom++)
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if ((media_types[type_geom].cylinders == header.cylinders) && (media_types[type_geom].heads == header.heads) && (media_types[type_geom].sectors == header.sectors) && (media_types[type_geom].sectorsize == header.sectorsize))
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break;
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printf("C=%d H=%d S=%d, %lu sectors of %dB (total %luB) [%s]\n", header.cylinders, header.heads, header.sectors, final_sectors, header.sectorsize, (unsigned long)final_size, media_types[type_geom].name);
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sres = fseek(inf, header.commentoffset, SEEK_SET);
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if (sres != 0) {
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perror("comment seek()");
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fclose(inf);
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if (rbuf)
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free(rbuf);
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return;
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}
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c = fgets(comment, sizeof(comment), inf);
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if (c == NULL) {
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perror("fgets()");
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fclose(inf);
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if (rbuf)
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free(rbuf);
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return;
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}
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if (strlen(c) > 0)
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printf("comment: %s", c);
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start_offset = header.firstoffset ? header.firstoffset : 0x200;
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sres = fseek(inf, start_offset, SEEK_SET);
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if (sres != 0) {
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perror("start seek()");
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fclose(inf);
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if (rbuf)
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free(rbuf);
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return;
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}
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outname = guess_output_filename(filename, (header.magic == MAGIC_DSK_COMPRESSED) && (no_lzw != 0));
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outf = fopen(outname, "wb+");
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if (outf == NULL) {
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perror("fopen()");
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fclose(inf);
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free(outname);
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if (rbuf)
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free(rbuf);
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return;
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}
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wbuf = (char*)malloc(4096);
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if (wbuf)
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setvbuf(outf, wbuf, _IOFBF, 4096);
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else
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printf("WARNING: can't allocate write buffer.");
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buffer = (uint8_t*)malloc(header.sectorsize);
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if (buffer == NULL) {
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perror("malloc()");
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fclose(outf);
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fclose(inf);
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free(outname);
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if (rbuf)
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free(rbuf);
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if (wbuf)
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free(wbuf);
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return;
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}
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/* image_sectors = (header.imageclusters << header.clustershift) +
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header.firstclustersector - 1; */
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image_sectors = header.imagesectors;
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checksum = 0;
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if (header.magic != MAGIC_DSK_COMPRESSED) {
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for (sector = 0; sector < image_sectors; sector++) {
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rres = fread(buffer, header.sectorsize, 1, inf);
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if (rres != 1) {
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perror("fread()");
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fclose(outf);
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fclose(inf);
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free(buffer);
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free(outname);
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if (rbuf)
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free(rbuf);
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if (wbuf)
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free(wbuf);
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return;
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}
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for (i = 0; i < header.sectorsize / 2; i++)
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checksum += buffer[i * 2] + 256 * buffer[i * 2 + 1];
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rres = fwrite(buffer, header.sectorsize, 1, outf);
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if (rres != 1) {
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perror("fwrite()");
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fclose(outf);
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fclose(inf);
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free(buffer);
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free(outname);
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if (rbuf)
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free(rbuf);
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if (wbuf)
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free(wbuf);
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return;
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}
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}
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pad_file_to_size(outf, final_size);
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if (checksum != header.checksum)
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printf("ERROR: image checksum does not match. Expected 0x%08x but got 0x%08x\n", header.checksum, checksum);
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else
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puts("Done.");
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} else {
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if (no_lzw) {
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size_t wres;
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for (sector = 0;; sector++) {
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rres = fread(buffer, 1, header.sectorsize, inf);
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for (i = 0; i < rres; i++)
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checksum += buffer[i];
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wres = fwrite(buffer, 1, rres, outf);
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if (wres != rres) {
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perror("fwrite()");
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fclose(outf);
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fclose(inf);
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free(buffer);
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free(outname);
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if (rbuf)
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free(rbuf);
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if (wbuf)
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free(wbuf);
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return;
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}
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if (rres < header.sectorsize)
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break;
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}
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} else {
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/* TODO: checksum */
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lzw_decompress_file(inf, outf);
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pad_file_to_size(outf, final_size);
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}
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}
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fclose(outf);
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fclose(inf);
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free(buffer);
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free(outname);
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if (rbuf)
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free(rbuf);
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if (wbuf)
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free(wbuf);
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}
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void help(void)
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{
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puts("Syntax: dsk2img [-h] [-n] [FILE...]");
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puts("\t-n\tDo not attempt to decompress compressed images");
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puts("\t-h\tShow this help");
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}
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int main(int argc, char* const argv[])
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{
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int i;
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int no_lzw = 0;
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int c;
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while ((c = getopt(argc, argv, "hn")) != -1)
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switch (c) {
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case 'n':
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no_lzw = 1;
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break;
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case '?':
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case 'h':
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help();
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return EXIT_SUCCESS;
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}
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if (optind >= argc)
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help();
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else
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for (i = optind; i < argc; i++)
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/* TODO: handle DOS file globbing */
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dsk2img(argv[i], no_lzw);
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return EXIT_SUCCESS;
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}
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