view ffstools/tiffs-rd/inode.c @ 964:a96cb97b66a2

ringtools/imy: fix duplicate definition of tdma_durations[] The bug was reported by Vadim Yanitskiy <fixeria@osmocom.org>, although the present fix is slightly different from the contributed patch: because main.c doesn't need this tdma_durations[] array at all, let's simply remove the reference to this array from main.c rather than turn it into an extern. I no longer remember my original thought flow that resulted (by mistake) in tdma_durations[] being multiply defined in main.c and durations.c. My intent might have been to define all globals in main.c and have the reference in durations.c be an extern - and I missed that extern - but without clear memory, I have no certainty. In any case, having this data array defined in the same module that fills it (durations.c) is sensible, so let's make it the new way.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 31 Aug 2023 19:38:18 +0000
parents e7502631a0f9
children
line wrap: on
line source

/*
 * This C module implements the reading and decoding of inode information.
 */

#include <sys/types.h>
#include <endian.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "types.h"
#include "struct.h"
#include "globals.h"

u8 blank_flash_line[16] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
			   0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

alloc_inode_table()
{
	inode_info = malloc(sizeof(struct inode_info *) * inode_limit);
	if (!inode_info) {
		perror("malloc of inode table");
		exit(1);
	}
	bzero(inode_info, sizeof(struct inode_info *) * inode_limit);
}

static int
convert_ptr(in, infp)
	int in;
	int *infp;
{
	if (in == 0xFFFF) {
		*infp = 0;
		return(0);
	}
	if (in < 1 || in >= inode_limit)
		return(-1);
	*infp = in;
	return(1);
}

validate_inode(ino)
{
	struct inode_flash *fl;
	struct inode_info *inf;

	if (ino < 1 || ino >= inode_limit)
		return(0);
	if (inode_info[ino])
		return(1);
	fl = (struct inode_flash *)inode_block + ino;
	if (!bcmp(fl, blank_flash_line, sizeof blank_flash_line))
		return(0);
	inf = malloc(sizeof(struct inode_info));
	if (!inf) {
		perror("malloc of struct inode_info");
		exit(1);
	}
	bzero(inf, sizeof(struct inode_info));
	inf->ino = ino;
	inf->len = le16toh(fl->len);
	if (inf->len & 0xF) {
		fprintf(stderr,
			"warning: inode #%x: invalid length, skipping\n", ino);
		free(inf);
		return(0);
	}
	inf->type = fl->type;
	switch (inf->type) {
	case 0x00:
		break;
	case 0xE1:
	case 0xF1:
	case 0xF2:
	case 0xF3:
	case 0xF4:
		if (!inf->len) {
			fprintf(stderr,
	"warning: inode #%x: non-deleted object has zero length, skipping\n",
				ino);
			free(inf);
			return(0);
		}
		break;
	default:
		fprintf(stderr,
		"warning: inode #%x: unexpected object type %02X, skipping\n",
			ino, inf->type);
		free(inf);
		return(0);
	}
	if (convert_ptr(le16toh(fl->descend), &inf->descend) < 0) {
		fprintf(stderr,
		"warning: inode #%x: invalid descend pointer, skipping\n",
			ino);
		free(inf);
		return(0);
	}
	if (convert_ptr(le16toh(fl->sibling), &inf->sibling) < 0) {
		fprintf(stderr,
		"warning: inode #%x: invalid sibling pointer, skipping\n",
			ino);
		free(inf);
		return(0);
	}
	if (inf->len) {
		inf->rawloc = le32toh(fl->dataptr);
		if (old_16bit_location)
			inf->rawloc >>= 16;
		if (inf->rawloc > 0x0FFFFFFF) {
invdptr:		fprintf(stderr,
			"warning: inode #%x: invalid data pointer, skipping\n",
				ino);
			free(inf);
			return(0);
		}
		inf->offset = inf->rawloc << 4;
		if (inf->offset >= total_ffs_size)
			goto invdptr;
		if (inf->offset + inf->len > total_ffs_size) {
			fprintf(stderr,
"warning: inode #%x: data pointer + length > FFS total size, skipping\n",
				ino);
			free(inf);
			return(0);
		}
		inf->dataptr = image + inf->offset;
	}
	inode_info[ino] = inf;
	return(1);
}

find_root_inode()
{
	int ino;

	if (root_inode) {
		if (!validate_inode(root_inode)) {
			fprintf(stderr,
			"error: root inode specified with -r is invalid\n");
			exit(1);
		}
		return(1);
	}
	for (ino = 1; ino < inode_limit; ino++) {
		if (!validate_inode(ino))
			continue;
		if (inode_info[ino]->type != 0xF2)
			continue;
		if (*inode_info[ino]->dataptr != '/')
			continue;
		root_inode = ino;
		if (verbose)
			fprintf(stderr, "Found root inode at #%x\n", ino);
		if (inode_info[ino]->sibling)
			fprintf(stderr,
		"warning: root inode #%x has a non-null sibling pointer\n",
				ino);
		return(0);
	}
	fprintf(stderr, "error: no root inode found; try -r\n");
	exit(1);
}