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Add LZW support for Teledisk 1.x advanced compressed files.

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This commit is contained in:
OBattler
2024-07-08 03:18:26 +02:00
parent 0a8d98e913
commit db16f0f209
7 changed files with 876 additions and 9 deletions
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31
src/floppy/fdd_td0.c
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@@ -42,6 +42,7 @@
#include <86box/fdd_86f.h>
#include <86box/fdd_td0.h>
#include <86box/fdc.h>
#include "lzw/lzw.h"
#define BUFSZ 512 /* new input buffer */
#define TD0_MAX_BUFSZ (1024UL * 1024UL * 4UL)
@@ -124,7 +125,9 @@ typedef struct td0_t {
uint8_t xdf_ordered_pos[256][2];
uint8_t interleave_ordered_pos[256][2];
uint8_t *lzw_buf;
uint8_t *imagebuf;
uint8_t *processed_buf;
} td0_t;
@@ -650,11 +653,20 @@ td0_initialize(int drive)
head_count = header[9];
if (header[0] == 't') {
td0_log("TD0: File is compressed\n");
disk_decode.fdd_file = dev->fp;
state_init_Decode(&disk_decode);
disk_decode.fdd_file_offset = 12;
state_Decode(&disk_decode, dev->imagebuf, TD0_MAX_BUFSZ);
if (((header[4] / 10) % 10) == 2) {
td0_log("TD0: File is compressed (TeleDisk 2.x, LZHUF)\n");
disk_decode.fdd_file = dev->fp;
state_init_Decode(&disk_decode);
disk_decode.fdd_file_offset = 12;
state_Decode(&disk_decode, dev->imagebuf, TD0_MAX_BUFSZ);
} else {
td0_log("TD0: File is compressed (TeleDisk 1.x, LZW)\n");
if (fseek(dev->fp, 12, SEEK_SET) == -1)
fatal("td0_initialize(): Error seeking to offet 12\n");
if (fread(dev->lzw_buf, 1, file_size - 12, dev->fp) != (file_size - 12))
fatal("td0_initialize(): Error reading LZW-encoded buffer\n");
LZWDecodeFile((char *) dev->imagebuf, (char *) dev->lzw_buf, NULL, file_size - 12);
}
} else {
td0_log("TD0: File is uncompressed\n");
if (fseek(dev->fp, 12, SEEK_SET) == -1)
@@ -1224,10 +1236,9 @@ td0_load(int drive, char *fn)
/* Allocate the processing buffers. */
i = 1024UL * 1024UL * 4UL;
dev->imagebuf = (uint8_t *) malloc(i);
memset(dev->imagebuf, 0x00, i);
dev->processed_buf = (uint8_t *) malloc(i);
memset(dev->processed_buf, 0x00, i);
dev->lzw_buf = (uint8_t *) calloc(1, i);
dev->imagebuf = (uint8_t *) calloc(1, i);
dev->processed_buf = (uint8_t *) calloc(1, i);
if (!td0_initialize(drive)) {
td0_log("TD0: Failed to initialize\n");
@@ -1268,6 +1279,8 @@ td0_close(int drive)
d86f_unregister(drive);
if (dev->lzw_buf)
free(dev->lzw_buf);
if (dev->imagebuf)
free(dev->imagebuf);
if (dev->processed_buf)