+#ifdef CONFIG_JFFS2_SUMMARY
+static u32 sum_get_unaligned32(u32 *ptr)
+{
+ u32 val;
+ u8 *p = (u8 *)ptr;
+
+ val = *p | (*(p + 1) << 8) | (*(p + 2) << 16) | (*(p + 3) << 24);
+
+ return __le32_to_cpu(val);
+}
+
+static u16 sum_get_unaligned16(u16 *ptr)
+{
+ u16 val;
+ u8 *p = (u8 *)ptr;
+
+ val = *p | (*(p + 1) << 8);
+
+ return __le16_to_cpu(val);
+}
+
+#define dbg_summary(...) do {} while (0);
+/*
+ * Process the stored summary information - helper function for
+ * jffs2_sum_scan_sumnode()
+ */
+
+static int jffs2_sum_process_sum_data(struct part_info *part, uint32_t offset,
+ struct jffs2_raw_summary *summary,
+ struct b_lists *pL)
+{
+ void *sp;
+ int i, pass;
+ void *ret;
+
+ for (pass = 0; pass < 2; pass++) {
+ sp = summary->sum;
+
+ for (i = 0; i < summary->sum_num; i++) {
+ struct jffs2_sum_unknown_flash *spu = sp;
+ dbg_summary("processing summary index %d\n", i);
+
+ switch (sum_get_unaligned16(&spu->nodetype)) {
+ case JFFS2_NODETYPE_INODE: {
+ struct jffs2_sum_inode_flash *spi;
+ if (pass) {
+ spi = sp;
+
+ ret = insert_node(&pL->frag,
+ (u32)part->offset +
+ offset +
+ sum_get_unaligned32(
+ &spi->offset));
+ if (ret == NULL)
+ return -1;
+ }
+
+ sp += JFFS2_SUMMARY_INODE_SIZE;
+
+ break;
+ }
+ case JFFS2_NODETYPE_DIRENT: {
+ struct jffs2_sum_dirent_flash *spd;
+ spd = sp;
+ if (pass) {
+ ret = insert_node(&pL->dir,
+ (u32) part->offset +
+ offset +
+ sum_get_unaligned32(
+ &spd->offset));
+ if (ret == NULL)
+ return -1;
+ }
+
+ sp += JFFS2_SUMMARY_DIRENT_SIZE(
+ spd->nsize);
+
+ break;
+ }
+ default : {
+ uint16_t nodetype = sum_get_unaligned16(
+ &spu->nodetype);
+ printf("Unsupported node type %x found"
+ " in summary!\n",
+ nodetype);
+ if ((nodetype & JFFS2_COMPAT_MASK) ==
+ JFFS2_FEATURE_INCOMPAT)
+ return -EIO;
+ return -EBADMSG;
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+/* Process the summary node - called from jffs2_scan_eraseblock() */
+int jffs2_sum_scan_sumnode(struct part_info *part, uint32_t offset,
+ struct jffs2_raw_summary *summary, uint32_t sumsize,
+ struct b_lists *pL)
+{
+ struct jffs2_unknown_node crcnode;
+ int ret, ofs;
+ uint32_t crc;
+
+ ofs = part->sector_size - sumsize;
+
+ dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
+ offset, offset + ofs, sumsize);
+
+ /* OK, now check for node validity and CRC */
+ crcnode.magic = JFFS2_MAGIC_BITMASK;
+ crcnode.nodetype = JFFS2_NODETYPE_SUMMARY;
+ crcnode.totlen = summary->totlen;
+ crc = crc32_no_comp(0, (uchar *)&crcnode, sizeof(crcnode)-4);
+
+ if (summary->hdr_crc != crc) {
+ dbg_summary("Summary node header is corrupt (bad CRC or "
+ "no summary at all)\n");
+ goto crc_err;
+ }
+
+ if (summary->totlen != sumsize) {
+ dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
+ goto crc_err;
+ }
+
+ crc = crc32_no_comp(0, (uchar *)summary,
+ sizeof(struct jffs2_raw_summary)-8);
+
+ if (summary->node_crc != crc) {
+ dbg_summary("Summary node is corrupt (bad CRC)\n");
+ goto crc_err;
+ }
+
+ crc = crc32_no_comp(0, (uchar *)summary->sum,
+ sumsize - sizeof(struct jffs2_raw_summary));
+
+ if (summary->sum_crc != crc) {
+ dbg_summary("Summary node data is corrupt (bad CRC)\n");
+ goto crc_err;
+ }
+
+ if (summary->cln_mkr)
+ dbg_summary("Summary : CLEANMARKER node \n");
+
+ ret = jffs2_sum_process_sum_data(part, offset, summary, pL);
+ if (ret == -EBADMSG)
+ return 0;
+ if (ret)
+ return ret; /* real error */
+
+ return 1;
+
+crc_err:
+ putstr("Summary node crc error, skipping summary information.\n");
+
+ return 0;
+}
+#endif /* CONFIG_JFFS2_SUMMARY */
+