mirror of
https://github.com/cc65/cc65.git
synced 2024-12-26 08:32:00 +00:00
347 lines
11 KiB
C
347 lines
11 KiB
C
#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <dirent.h>
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#include <device.h>
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#include <dio.h>
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unsigned char info_signature[3] = {3, 21, 63 | 0x80};
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dhandle_t dhandle;
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struct dir_entry_t {
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struct {
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unsigned name_length :4;
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unsigned storage_type :4;
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} storage_length;
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char file_name[15];
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unsigned char file_type;
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unsigned key_pointer;
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unsigned blocks_used;
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unsigned char size[3];
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unsigned long creation;
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unsigned char version;
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unsigned char min_version;
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unsigned char access;
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unsigned aux_type;
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unsigned long last_mod;
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unsigned header_pointer;
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}* dir_entry;
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union {
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unsigned char bytes[512];
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struct {
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unsigned prev_block;
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unsigned next_block;
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unsigned char entries[1];
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} content;
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} dir_block;
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union {
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unsigned char bytes[512];
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struct {
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unsigned char addr_lo[254];
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unsigned char size_lo[2];
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unsigned char addr_hi[254];
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unsigned char size_hi[2];
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} content;
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} index_block, master_block, vlir_block;
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union {
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unsigned char bytes[512];
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struct {
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unsigned reserved;
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unsigned char info_block[254];
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unsigned char vlir_records[128];
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struct dir_entry_t dir_entry;
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} content;
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} header_block;
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static void err_exit(char *operation, unsigned char oserr)
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{
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if (oserr) {
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fprintf(stderr, "%s - err:%02x - %s",
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operation, (int)_oserror, _stroserror(_oserror));
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} else {
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fprintf(stderr, "%s",
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operation);
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}
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getchar();
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exit(EXIT_FAILURE);
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}
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static unsigned get_dir_entry(char* p_name)
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{
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char* d_name;
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char* f_name;
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size_t f_namelen;
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DIR* dir;
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struct dirent* dirent;
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unsigned cur_addr;
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unsigned char entry_length;
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unsigned char entries_per_block;
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unsigned char cur_entry;
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/* Split path name into directory name and file name */
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f_name = strrchr(p_name, '/');
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if (f_name) {
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d_name = p_name;
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*f_name++ = '\0';
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} else {
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d_name = ".";
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f_name = p_name;
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}
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f_namelen = strlen(f_name);
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/* Start with high level functions to get handling
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of relative path and current drive for free */
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dir = opendir(d_name);
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if (!dir) {
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err_exit("opendir", 1);
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}
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dirent = readdir(dir);
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if (!dirent) {
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err_exit("readdir", 1);
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}
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/* Field header_pointer directly follows field last_mod */
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cur_addr = *(unsigned*)(&dirent->d_mtime.hour + 1);
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dhandle = dio_open(getcurrentdevice());
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if (!dhandle) {
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err_exit("dio_open", 1);
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}
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if (dio_read(dhandle, cur_addr, &dir_block)) {
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err_exit("dio_read.1", 1);
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}
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/* Get directory entry infos from directory header */
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entry_length = dir_block.bytes[0x23];
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entries_per_block = dir_block.bytes[0x24];
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/* Skip directory header entry */
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cur_entry = 1;
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do {
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/* Search for next active directory entry */
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do {
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/* Check if next directory block is necessary */
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if (cur_entry == entries_per_block) {
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/* Check if another directory block is present */
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cur_addr = dir_block.content.next_block;
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if (!cur_addr) {
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_mappederrno(0x46);
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err_exit("dio_read.2", 1);
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}
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/* Read next directory block */
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if (dio_read(dhandle, cur_addr, &dir_block)) {
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err_exit("dio_read.3", 1);
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}
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/* Start with first entry in next block */
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cur_entry = 0;
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}
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/* Compute pointer to current entry */
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dir_entry = (struct dir_entry_t*)(dir_block.content.entries +
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cur_entry * entry_length);
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/* Switch to next entry */
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++cur_entry;
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} while (!dir_entry->storage_length.storage_type);
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} while (dir_entry->storage_length.name_length != f_namelen ||
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strncasecmp(dir_entry->file_name, f_name, f_namelen));
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return cur_addr;
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}
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int main(int argc, char* argv[])
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{
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char input[80];
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char* p_name;
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unsigned dir_addr;
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unsigned header_addr;
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unsigned char index;
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unsigned long size;
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if (argc > 1) {
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p_name = argv[1];
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} else {
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printf("\n"
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"Apple GEOS Convert 1.0\n"
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"----------------------\n"
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"\n"
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"Pathname:");
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p_name = gets(input);
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}
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dir_addr = get_dir_entry(p_name);
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/* Read index block */
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if (dio_read(dhandle, dir_entry->key_pointer, &index_block)) {
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err_exit("dio_read.4", 1);
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}
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/* First pointer is header block */
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header_addr = index_block.content.addr_lo[0] |
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index_block.content.addr_hi[0] << 8;
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/* Read header block */
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if (dio_read(dhandle, header_addr, &header_block)) {
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err_exit("dio_read.5", 1);
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}
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/* Do some sanity check */
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for (index = 0; index < sizeof(info_signature); ++index) {
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if (header_block.content.info_block[index] != info_signature[index]) {
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err_exit("file signature mismatch", 0);
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}
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}
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/* Check ProDOS storage type in directory entry template */
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if (header_block.content.dir_entry.storage_length.storage_type == 2)
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{
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/* ProDOS sapling file means GEOS Sequential file*/
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printf("\nSequential file\n");
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/* Remove header block pointer from pointer list */
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memmove(&index_block.content.addr_lo[0],
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&index_block.content.addr_lo[1], sizeof(index_block.content.addr_lo) - 1);
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memmove(&index_block.content.addr_hi[0],
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&index_block.content.addr_hi[1], sizeof(index_block.content.addr_hi) - 1);
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/* Get file size from ProDOS directory entry template */
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size = (unsigned long)(header_block.content.dir_entry.size[0]) |
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(unsigned long)(header_block.content.dir_entry.size[1]) << 8 |
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(unsigned long)(header_block.content.dir_entry.size[2]) << 16;
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} else {
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/* ProDOS tree file means GEOS VLIR file */
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unsigned vlir_addr;
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unsigned long vlir_size;
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unsigned char vlir_blocks;
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unsigned char record = 0;
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printf("\nVLIR file\n");
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/* Skip header block pointer */
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index = 1;
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size = 0;
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while (1) {
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/* Get next VLIR index pointer from index block */
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vlir_addr = index_block.content.addr_lo[index] |
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index_block.content.addr_hi[index] << 8;
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++index;
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/* Check for end of pointer list */
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if (vlir_addr == 0) {
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break;
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}
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/* Check for empty VLIRs */
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while (header_block.content.vlir_records[record] == 0xFF) {
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/* Add empty VLIR index pointer to to master index block */
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master_block.content.addr_lo[record] = 0xFF;
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master_block.content.addr_hi[record] = 0xFF;
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++record;
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}
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/* Add VLIR index pointer to master index block */
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master_block.content.addr_lo[record] = (unsigned char)(vlir_addr );
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master_block.content.addr_hi[record] = (unsigned char)(vlir_addr >> 8);
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++record;
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/* Read VLIR index block */
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if (dio_read(dhandle, vlir_addr, &vlir_block)) {
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err_exit("dio_read.6", 1);
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}
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/* Get VLIR size from VLIR index block */
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vlir_size = (unsigned long)(vlir_block.content.size_lo[1]) |
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(unsigned long)(vlir_block.content.size_hi[1]) << 8 |
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(unsigned long)(vlir_block.content.size_lo[0]) << 16 |
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(unsigned long)(vlir_block.content.size_hi[0]) << 24;
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printf("VLIR %u size %lu bytes\n", record - 1, vlir_size);
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/* Compute VLIR block size */
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vlir_blocks = (unsigned char)((vlir_size + 511) / 512);
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/* Copy VLIR block pointers from index block to VLIR index block */
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memcpy(&vlir_block.content.addr_lo[0],
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&index_block.content.addr_lo[index], vlir_blocks);
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memcpy(&vlir_block.content.addr_hi[0],
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&index_block.content.addr_hi[index], vlir_blocks);
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index += vlir_blocks;
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/* Write back VLIR index block */
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if (dio_write(dhandle, vlir_addr, &vlir_block)) {
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err_exit("dio_write.1", 1);
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}
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/* Add VLIR size to file size */
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size += vlir_size;
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}
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/* Replace (by now completely read) index block with
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(by now completely created) master index block */
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index_block = master_block;
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}
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printf("File size %lu bytes\n\n", size);
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/* Set file size in index block */
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index_block.content.size_lo[1] = (unsigned char)(size );
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index_block.content.size_hi[1] = (unsigned char)(size >> 8);
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index_block.content.size_lo[0] = (unsigned char)(size >> 16);
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index_block.content.size_hi[0] = (unsigned char)(size >> 24);
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/* Write index block */
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if (dio_write(dhandle, dir_entry->key_pointer, &index_block)) {
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err_exit("dio_write.2", 1);
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}
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/* Copy selected fields from directory entry template to directory block */
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dir_entry->storage_length = header_block.content.dir_entry.storage_length;
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memcpy(dir_entry->file_name, header_block.content.dir_entry.file_name, 15);
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dir_entry->file_type = header_block.content.dir_entry.file_type;
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dir_entry->size[0] = (unsigned char)(size );
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dir_entry->size[1] = (unsigned char)(size >> 8);
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dir_entry->size[2] = (unsigned char)(size >> 16);
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dir_entry->creation = header_block.content.dir_entry.creation;
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dir_entry->version = header_block.content.dir_entry.version;
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dir_entry->min_version = header_block.content.dir_entry.min_version;
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dir_entry->aux_type = header_addr;
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dir_entry->last_mod = header_block.content.dir_entry.last_mod;
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/* Write directory block */
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if (dio_write(dhandle, dir_addr, &dir_block)) {
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err_exit("dio_write.3", 1);
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}
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/* We're done */
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if (dio_close(dhandle)) {
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err_exit("dio_close", 1);
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}
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printf("Convert to '%.*s' successful", dir_entry->storage_length.name_length,
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dir_entry->file_name);
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getchar();
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return EXIT_SUCCESS;
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}
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