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Annotation of uae/readdisk.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * readdisk
        !             3:  * 
        !             4:  * Read files from Amiga disk files
        !             5:  *
        !             6:  * Copyright 1996 Bernd Schmidt
        !             7:  */
        !             8: 
        !             9: #include <sys/types.h>
        !            10: #include <sys/stat.h>
        !            11: #include <fcntl.h>
        !            12: #include <unistd.h>
        !            13: #include <errno.h>
        !            14: 
        !            15: #include <stdio.h>
        !            16: #include <stdlib.h>
        !            17: #include <string.h>
        !            18: 
        !            19: #include "amiga.h"
        !            20: 
        !            21: unsigned char filemem[901120];
        !            22: 
        !            23: typedef struct afile
        !            24: {
        !            25:     struct afile *sibling;
        !            26:     unsigned char *data;
        !            27:     ULONG size;
        !            28:     char name[32];
        !            29: } afile;
        !            30: 
        !            31: typedef struct directory
        !            32: {
        !            33:     struct directory *sibling;
        !            34:     struct directory *subdirs;
        !            35:     struct afile *files;
        !            36:     char name[32];
        !            37: } directory;
        !            38: 
        !            39: static ULONG readlong (unsigned char *buffer, int pos)
        !            40: {
        !            41:     return ((*(buffer + pos) << 24) + (*(buffer + pos + 1) << 16)
        !            42:             + (*(buffer + pos + 2) << 8) + *(buffer + pos + 3));
        !            43: }
        !            44: 
        !            45: static afile *read_file (unsigned char *filebuf)
        !            46: {
        !            47:     afile *a = (afile *)malloc(sizeof(afile));
        !            48:     int sizeleft;
        !            49:     unsigned char *datapos;
        !            50:     ULONG numblocks, blockpos;
        !            51:     
        !            52:     /* BCPL strings... Yuk. */
        !            53:     memset (a->name, 0, 32);
        !            54:     strncpy (a->name, (const char *)filebuf + 0x1B1, *(filebuf + 0x1B0));
        !            55:     sizeleft = a->size = readlong (filebuf, 0x144);
        !            56:     a->data = (unsigned char *)malloc(a->size);
        !            57: 
        !            58:     numblocks = readlong (filebuf, 0x8);
        !            59:     blockpos = 0x134;
        !            60:     datapos = a->data;
        !            61:     while (numblocks)
        !            62:     {
        !            63:        unsigned char *databuf = filemem + 512*readlong (filebuf, blockpos);
        !            64:        int readsize = sizeleft > 488 ? 488 : sizeleft;
        !            65:        memcpy (datapos, databuf + 0x18, readsize);
        !            66:        datapos += readsize;
        !            67:        sizeleft -= readsize;
        !            68:        
        !            69:        blockpos -= 4;
        !            70:        numblocks--;
        !            71:        if (blockpos < 0x18 && numblocks) {         
        !            72:            filebuf = filemem + 512*readlong (filebuf, 0x1F8);
        !            73:            if (!filebuf) {
        !            74:                fprintf(stderr, "Disk structure corrupted. Use DISKDOCTOR to correct it.\n");
        !            75:                abort ();
        !            76:            }
        !            77:        }
        !            78:     }
        !            79:     return a;
        !            80: }
        !            81: 
        !            82: static directory *read_dir (unsigned char *dirbuf)
        !            83: {
        !            84:     directory *d = (directory *)malloc(sizeof(directory));
        !            85:     ULONG hashsize;
        !            86:     ULONG i;
        !            87:     
        !            88:     memset (d->name, 0, 32);
        !            89:     strncpy (d->name, (const char *)dirbuf + 0x1B1, *(dirbuf + 0x1B0));
        !            90:     d->sibling = 0;
        !            91:     d->subdirs = 0;
        !            92:     d->files = 0;
        !            93:     hashsize = readlong (dirbuf, 0xc);
        !            94:     if (!hashsize)
        !            95:        hashsize = 72;
        !            96:     if (hashsize != 72)
        !            97:        fprintf(stderr, "Warning: Hash table with != 72 entries.\n");
        !            98:     for (i = 0; i < hashsize; i++) {
        !            99:        ULONG subblock = readlong (dirbuf, 0x18 + 4*i);
        !           100:        while (subblock) {          
        !           101:            directory *subdir;
        !           102:            afile *subfile;
        !           103:            unsigned char *subbuf = filemem + 512*subblock;
        !           104:            
        !           105:            switch (readlong (subbuf, 0x1FC)) {
        !           106:             case 0x00000002:
        !           107:                subdir = read_dir (subbuf);
        !           108:                subdir->sibling = d->subdirs;
        !           109:                d->subdirs = subdir;
        !           110:                break;
        !           111:                
        !           112:             case 0xFFFFFFFD:
        !           113:                subfile = read_file (subbuf);
        !           114:                subfile->sibling = d->files;
        !           115:                d->files = subfile;
        !           116:                break;
        !           117:                
        !           118:             default:
        !           119:                fprintf(stderr, "Disk structure corrupted. Use DISKDOCTOR to correct it.\n");
        !           120:                abort ();
        !           121:            }
        !           122:            subblock = readlong (subbuf, 0x1F0);
        !           123:        }
        !           124:     }
        !           125:     return d;
        !           126: }
        !           127: 
        !           128: static void writedir(directory *dir)
        !           129: {
        !           130:     directory *subdir;
        !           131:     afile *f;
        !           132:     
        !           133:     if (mkdir (dir->name, 0777) < 0 && errno != EEXIST) {      
        !           134:        fprintf(stderr, "Could not create directory \"%s\". Giving up.\n", dir->name);
        !           135:        exit (20);      
        !           136:     }
        !           137:     if (chdir (dir->name) < 0) {
        !           138:        fprintf(stderr, "Could not enter directory \"%s\". Giving up.\n", dir->name);
        !           139:        exit (20);
        !           140:     }
        !           141:     for (subdir = dir->subdirs; subdir; subdir = subdir->sibling)
        !           142:        writedir (subdir);
        !           143:     for (f = dir->files; f; f = f->sibling) {
        !           144:        int fd = creat (f->name, 0666);
        !           145:        if (fd < 0) {
        !           146:            fprintf(stderr, "Could not create file. Giving up.\n");
        !           147:            exit (20);
        !           148:        }
        !           149:        write (fd, f->data, f->size);
        !           150:        close (fd);
        !           151:     }    
        !           152:     chdir ("..");
        !           153: }
        !           154: 
        !           155: int main(int argc, char **argv)
        !           156: {
        !           157:     directory *root;
        !           158:     FILE *inf;
        !           159:     if (argc < 2 || argc > 3) {
        !           160:        fprintf(stderr, "Usage: readdisk <file> [<destdir>]\n");
        !           161:        exit (20);
        !           162:     }
        !           163:     inf = fopen(argv[1], "rb");
        !           164:     if (inf == NULL) {
        !           165:        fprintf(stderr, "can't open file\n");
        !           166:        exit (20);
        !           167:     }
        !           168:     fread(filemem, 1, 901120, inf);
        !           169:     
        !           170:     if (strncmp((const char *)filemem, "DOS\0", 4) != 0) {
        !           171:        fprintf(stderr, "Not a DOS disk.\n");
        !           172:        exit (20);
        !           173:     }
        !           174:     root = read_dir (filemem + 880*512);
        !           175: 
        !           176:     if (argc == 3)
        !           177:        if (chdir (argv[2]) < 0) {
        !           178:            fprintf(stderr, "Couldn't change to %s. Giving up.\n", argv[2]);
        !           179:            exit (20);
        !           180:        }
        !           181:     writedir (root);
        !           182:     return 0;
        !           183: }

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