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

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