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/*
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* Copyright (C) 2018 bzt (bztsrc@github)
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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*/
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#include "uart.h"
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/* POSIX ustar header format */
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typedef struct { /* byte offset */
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char name[100]; /* 0 */
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char mode[8]; /* 100 */
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char uid[8]; /* 108 */
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char gid[8]; /* 116 */
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char size[12]; /* 124 */
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char mtime[12]; /* 136 */
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char chksum[8]; /* 148 */
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char typeflag; /* 156 */
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char linkname[100]; /* 157 */
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char magic[6]; /* 257 */
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char version[2]; /* 263 */
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char uname[32]; /* 265 */
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char gname[32]; /* 297 */
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char devmajor[8]; /* 329 */
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char devminor[8]; /* 337 */
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char prefix[167]; /* 345 */
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} __attribute__((packed)) tar_t;
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/* cpio hpodc format */
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typedef struct {
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char magic[6]; /* Magic header '070707'. */
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char dev[6]; /* device number. */
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char ino[6]; /* "i-node" number. */
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char mode[6]; /* Permisions. */
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char uid[6]; /* User ID. */
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char gid[6]; /* Group ID. */
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char nlink[6]; /* Number of hard links. */
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char rdev[6]; /* device major/minor number. */
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char mtime[11]; /* Modification time. */
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char namesize[6]; /* Length of filename in bytes. */
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char filesize[11]; /* File size. */
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} __attribute__((packed)) cpio_t;
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/**
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* Helper function to convert ASCII octal number into binary
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* s string
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* n number of digits
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*/
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int oct2bin(char *s, int n)
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{
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int r=0;
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while(n-->0) {
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r<<=3;
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r+=*s++-'0';
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}
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return r;
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}
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/**
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* List the contents of an archive
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*/
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void initrd_list(char *buf)
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{
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char *types[]={"regular", "link ", "symlnk", "chrdev", "blkdev", "dircty", "fifo ", "??? "};
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uart_puts("Type Offset Size Access rights\tFilename\n");
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// iterate on archive's contents
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while(!__builtin_memcmp(buf+257,"ustar",5)) {
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// if it's an ustar archive
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tar_t *header=(tar_t*)buf;
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int fs=oct2bin(header->size,11);
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// print out meta information
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uart_puts(types[header->typeflag-'0']);
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uart_send(' ');
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uart_send(' ');
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uart_hex((unsigned int)((unsigned long)buf)+sizeof(tar_t));
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uart_send(' ');
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uart_hex(fs); // file size in hex
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uart_send(' ');
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uart_puts(header->mode); // access bits in octal
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uart_send(' ');
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uart_puts(header->uname); // owner
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uart_send('.');
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uart_puts(header->gname); // group
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uart_send('\t');
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uart_puts(buf); // filename
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if(header->typeflag=='2') {
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uart_puts(" -> "); // symlink target
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uart_puts(header->linkname);
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}
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uart_puts("\n");
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// jump to the next file
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buf+=(((fs+511)/512)+1)*512;
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}
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// if it's a cpio archive. Cpio also has a trailer entry
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while(!__builtin_memcmp(buf,"070707",6) && __builtin_memcmp(buf+sizeof(cpio_t),"TRAILER!!",9)) {
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cpio_t *header = (cpio_t*)buf;
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int ns=oct2bin(header->namesize,6);
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int fs=oct2bin(header->filesize,11);
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// print out meta information
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uart_hex(oct2bin(header->mode,6)); // mode (access rights + type)
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uart_send(' ');
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uart_hex((unsigned int)((unsigned long)buf)+sizeof(cpio_t)+ns);
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uart_send(' ');
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uart_hex(fs); // file size in hex
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uart_send(' ');
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uart_hex(oct2bin(header->uid,6)); // user id in hex
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uart_send('.');
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uart_hex(oct2bin(header->gid,6)); // group id in hex
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uart_send('\t');
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uart_puts(buf+sizeof(cpio_t)); // filename
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uart_puts("\n");
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// jump to the next file
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buf+=(sizeof(cpio_t)+ns+fs);
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}
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}
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