C++ crc32函数代码示例

	virtual void registerProperty(const char* component_type,
								  IPropertyDescriptor* descriptor) override
	{
		ASSERT(descriptor);
		getPropertyDescriptors(crc32(component_type)).push(descriptor);
	}

/*
 * Helper function for jffs2_get_inode_nodes().
 * It is called every time an inode node is found.
 *
 * Returns: 0 on success (possibly after marking a bad node obsolete);
 * 	    negative error code on failure.
 */
static inline int read_dnode(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref,
			     struct jffs2_raw_inode *rd, int rdlen,
			     struct jffs2_readinode_info *rii)
{
	struct jffs2_tmp_dnode_info *tn;
	uint32_t len, csize;
	int ret = 0;
	uint32_t crc;

	/* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
	BUG_ON(ref_obsolete(ref));

	crc = crc32(0, rd, sizeof(*rd) - 8);
	if (unlikely(crc != je32_to_cpu(rd->node_crc))) {
		JFFS2_NOTICE("node CRC failed on dnode at %#08x: read %#08x, calculated %#08x\n",
			     ref_offset(ref), je32_to_cpu(rd->node_crc), crc);
		jffs2_mark_node_obsolete(c, ref);
		return 0;
	}

	tn = jffs2_alloc_tmp_dnode_info();
	if (!tn) {
		JFFS2_ERROR("failed to allocate tn (%zu bytes).\n", sizeof(*tn));
		return -ENOMEM;
	}

	tn->partial_crc = 0;
	csize = je32_to_cpu(rd->csize);

	/* If we've never checked the CRCs on this node, check them now */
	if (ref_flags(ref) == REF_UNCHECKED) {

		/* Sanity checks */
		if (unlikely(je32_to_cpu(rd->offset) > je32_to_cpu(rd->isize)) ||
		    unlikely(PAD(je32_to_cpu(rd->csize) + sizeof(*rd)) != PAD(je32_to_cpu(rd->totlen)))) {
			JFFS2_WARNING("inode node header CRC is corrupted at %#08x\n", ref_offset(ref));
			jffs2_dbg_dump_node(c, ref_offset(ref));
			jffs2_mark_node_obsolete(c, ref);
			goto free_out;
		}

		if (jffs2_is_writebuffered(c) && csize != 0) {
			/* At this point we are supposed to check the data CRC
			 * of our unchecked node. But thus far, we do not
			 * know whether the node is valid or obsolete. To
			 * figure this out, we need to walk all the nodes of
			 * the inode and build the inode fragtree. We don't
			 * want to spend time checking data of nodes which may
			 * later be found to be obsolete. So we put off the full
			 * data CRC checking until we have read all the inode
			 * nodes and have started building the fragtree.
			 *
			 * The fragtree is being built starting with nodes
			 * having the highest version number, so we'll be able
			 * to detect whether a node is valid (i.e., it is not
			 * overlapped by a node with higher version) or not.
			 * And we'll be able to check only those nodes, which
			 * are not obsolete.
			 *
			 * Of course, this optimization only makes sense in case
			 * of NAND flashes (or other flashes with
			 * !jffs2_can_mark_obsolete()), since on NOR flashes
			 * nodes are marked obsolete physically.
			 *
			 * Since NAND flashes (or other flashes with
			 * jffs2_is_writebuffered(c)) are anyway read by
			 * fractions of c->wbuf_pagesize, and we have just read
			 * the node header, it is likely that the starting part
			 * of the node data is also read when we read the
			 * header. So we don't mind to check the CRC of the
			 * starting part of the data of the node now, and check
			 * the second part later (in jffs2_check_node_data()).
			 * Of course, we will not need to re-read and re-check
			 * the NAND page which we have just read. This is why we
			 * read the whole NAND page at jffs2_get_inode_nodes(),
			 * while we needed only the node header.
			 */
			unsigned char *buf;

			/* 'buf' will point to the start of data */
			buf = (unsigned char *)rd + sizeof(*rd);
			/* len will be the read data length */
			len = min_t(uint32_t, rdlen - sizeof(*rd), csize);
			tn->partial_crc = crc32(0, buf, len);

			dbg_readinode("Calculates CRC (%#08x) for %d bytes, csize %d\n", tn->partial_crc, len, csize);

			/* If we actually calculated the whole data CRC
			 * and it is wrong, drop the node. */
			if (len >= csize && unlikely(tn->partial_crc != je32_to_cpu(rd->data_crc))) {
				JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n",
					ref_offset(ref), tn->partial_crc, je32_to_cpu(rd->data_crc));
				jffs2_mark_node_obsolete(c, ref);
//.........这里部分代码省略.........

static void test_crc(int start)
{
	void *buf;
	u32 crc;

	if (!(super.flags & CRAMFS_FLAG_FSID_VERSION_2)) {
#ifdef INCLUDE_FS_TESTS
		return;
#else /* not INCLUDE_FS_TESTS */
		die(FSCK_USAGE, 0, "unable to test CRC: old cramfs format");
#endif /* not INCLUDE_FS_TESTS */
	}

	crc = crc32(0L, Z_NULL, 0);

	buf = mmap(NULL, super.size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
	if (buf == MAP_FAILED) {
		buf = mmap(NULL, super.size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
		if (buf != MAP_FAILED) {
			lseek(fd, 0, SEEK_SET);
			read(fd, buf, super.size);
		}
	}
	if (buf != MAP_FAILED) {
		((struct cramfs_super *) (buf+start))->fsid.crc = crc32(0L, Z_NULL, 0);
		crc = crc32(crc, buf+start, super.size-start);
		munmap(buf, super.size);
	}
	else {
		int retval;
		size_t length = 0;

		buf = malloc(4096);
		if (!buf) {
			die(FSCK_ERROR, 1, "malloc failed");
		}
		lseek(fd, start, SEEK_SET);
		for (;;) {
			retval = read(fd, buf, 4096);
			if (retval < 0) {
				die(FSCK_ERROR, 1, "read failed: %s", filename);
			}
			else if (retval == 0) {
				break;
			}
			if (length == 0) {
				((struct cramfs_super *) buf)->fsid.crc = crc32(0L, Z_NULL, 0);
			}
			length += retval;
			if (length > (super.size-start)) {
				crc = crc32(crc, buf, retval - (length - (super.size-start)));
				break;
			}
			crc = crc32(crc, buf, retval);
		}
		free(buf);
	}

	if (crc != super.fsid.crc) {
		die(FSCK_UNCORRECTED, 0, "crc error");
	}
}

/*
 * chfs_check_td_data - checks the data CRC of the node
 *
 * Returns: 0 - if everything OK;
 * 	    	1 - if CRC is incorrect;
 * 	    	2 - else;
 *	    	error code if an error occured.
 */
int
chfs_check_td_data(struct chfs_mount *chmp,
    struct chfs_tmp_dnode *td)
{
	int err;
	size_t retlen, len, totlen;
	uint32_t crc;
	uint64_t ofs;
	char *buf;
	struct chfs_node_ref *nref = td->node->nref;

	KASSERT(mutex_owned(&chmp->chm_lock_mountfields));
	KASSERT(!mutex_owned(&chmp->chm_lock_sizes));

	ofs = CHFS_GET_OFS(nref->nref_offset) + sizeof(struct chfs_flash_data_node);
	len = td->node->size;
	if (!len)
		return 0;

	/* Read data. */
	buf = kmem_alloc(len, KM_SLEEP);
	if (!buf) {
		dbg("allocating error\n");
		return 2;
	}
	err = chfs_read_leb(chmp, nref->nref_lnr, buf, ofs, len, &retlen);
	if (err) {
		dbg("error while reading: %d\n", err);
		err = 2;
		goto out;
	}

	/* Check crc. */
	if (len != retlen) {
		dbg("len:%zu, retlen:%zu\n", len, retlen);
		err = 2;
		goto out;
	}
	crc = crc32(0, (uint8_t *)buf, len);

	if (crc != td->data_crc) {
		dbg("crc failed, calculated: 0x%x, orig: 0x%x\n", crc, td->data_crc);
		kmem_free(buf, len);
		return 1;
	}

	/* Correct sizes. */
	CHFS_MARK_REF_NORMAL(nref);
	totlen = CHFS_PAD(sizeof(struct chfs_flash_data_node) + len);

	mutex_enter(&chmp->chm_lock_sizes);
	chfs_change_size_unchecked(chmp, &chmp->chm_blocks[nref->nref_lnr], -totlen);
	chfs_change_size_used(chmp, &chmp->chm_blocks[nref->nref_lnr], totlen);
	mutex_exit(&chmp->chm_lock_sizes);
	KASSERT(chmp->chm_blocks[nref->nref_lnr].used_size <= chmp->chm_ebh->eb_size);

	err = 0;
out:
	kmem_free(buf, len);
	return err;
}

/*
 * Check the data CRC of the node.
 *
 * Returns: 0 if the data CRC is correct;
 * 	    1 - if incorrect;
 *	    error code if an error occured.
 */
static int check_node_data(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info *tn)
{
	struct jffs2_raw_node_ref *ref = tn->fn->raw;
	int err = 0, pointed = 0;
	struct jffs2_eraseblock *jeb;
	unsigned char *buffer;
	uint32_t crc, ofs, len;
	size_t retlen;

	BUG_ON(tn->csize == 0);

	/* Calculate how many bytes were already checked */
	ofs = ref_offset(ref) + sizeof(struct jffs2_raw_inode);
	len = tn->csize;

	if (jffs2_is_writebuffered(c)) {
		int adj = ofs % c->wbuf_pagesize;
		if (likely(adj))
			adj = c->wbuf_pagesize - adj;

		if (adj >= tn->csize) {
			dbg_readinode("no need to check node at %#08x, data length %u, data starts at %#08x - it has already been checked.\n",
				      ref_offset(ref), tn->csize, ofs);
			goto adj_acc;
		}

		ofs += adj;
		len -= adj;
	}

	dbg_readinode("check node at %#08x, data length %u, partial CRC %#08x, correct CRC %#08x, data starts at %#08x, start checking from %#08x - %u bytes.\n",
		ref_offset(ref), tn->csize, tn->partial_crc, tn->data_crc, ofs - len, ofs, len);

#ifndef __ECOS
	/* TODO: instead, incapsulate point() stuff to jffs2_flash_read(),
	 * adding and jffs2_flash_read_end() interface. */
	if (c->mtd->point) {
		err = c->mtd->point(c->mtd, ofs, len, &retlen,
				    (void **)&buffer, NULL);
		if (!err && retlen < len) {
			JFFS2_WARNING("MTD point returned len too short: %zu instead of %u.\n", retlen, tn->csize);
			c->mtd->unpoint(c->mtd, ofs, retlen);
		} else if (err)
			JFFS2_WARNING("MTD point failed: error code %d.\n", err);
		else
			pointed = 1; /* succefully pointed to device */
	}
#endif

	if (!pointed) {
		buffer = kmalloc(len, GFP_KERNEL);
		if (unlikely(!buffer))
			return -ENOMEM;

		/* TODO: this is very frequent pattern, make it a separate
		 * routine */
		err = jffs2_flash_read(c, ofs, len, &retlen, buffer);
		if (err) {
			JFFS2_ERROR("can not read %d bytes from 0x%08x, error code: %d.\n", len, ofs, err);
			goto free_out;
		}

		if (retlen != len) {
			JFFS2_ERROR("short read at %#08x: %zd instead of %d.\n", ofs, retlen, len);
			err = -EIO;
			goto free_out;
		}
	}

	/* Continue calculating CRC */
	crc = crc32(tn->partial_crc, buffer, len);
	if(!pointed)
		kfree(buffer);
#ifndef __ECOS
	else
		c->mtd->unpoint(c->mtd, ofs, len);
#endif

	if (crc != tn->data_crc) {
		JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n",
			     ref_offset(ref), tn->data_crc, crc);
		return 1;
	}

adj_acc:
	jeb = &c->blocks[ref->flash_offset / c->sector_size];
	len = ref_totlen(c, jeb, ref);
	/* If it should be REF_NORMAL, it'll get marked as such when
	   we build the fragtree, shortly. No need to worry about GC
	   moving it while it's marked REF_PRISTINE -- GC won't happen
	   till we've finished checking every inode anyway. */
	ref->flash_offset |= REF_PRISTINE;
	/*
//.........这里部分代码省略.........

static ssize_t nic_receive(NetClientState *nc, const uint8_t * buf, size_t size)
{
    dp8393xState *s = DO_UPCAST(NICState, nc, nc)->opaque;
    uint16_t data[10];
    int packet_type;
    uint32_t available, address;
    int width, rx_len = size;
    uint32_t checksum;

    width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;

    s->regs[SONIC_RCR] &= ~(SONIC_RCR_PRX | SONIC_RCR_LBK | SONIC_RCR_FAER |
        SONIC_RCR_CRCR | SONIC_RCR_LPKT | SONIC_RCR_BC | SONIC_RCR_MC);

    packet_type = receive_filter(s, buf, size);
    if (packet_type < 0) {
        DPRINTF("packet not for netcard\n");
        return -1;
    }

    /* XXX: Check byte ordering */

    /* Check for EOL */
    if (s->regs[SONIC_LLFA] & 0x1) {
        /* Are we still in resource exhaustion? */
        size = sizeof(uint16_t) * 1 * width;
        address = ((s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]) + sizeof(uint16_t) * 5 * width;
        s->memory_rw(s->mem_opaque, address, (uint8_t*)data, size, 0);
        if (data[0 * width] & 0x1) {
            /* Still EOL ; stop reception */
            return -1;
        } else {
            s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
        }
    }

    /* Save current position */
    s->regs[SONIC_TRBA1] = s->regs[SONIC_CRBA1];
    s->regs[SONIC_TRBA0] = s->regs[SONIC_CRBA0];

    /* Calculate the ethernet checksum */
#ifdef SONIC_CALCULATE_RXCRC
    checksum = cpu_to_le32(crc32(0, buf, rx_len));
#else
    checksum = 0;
#endif

    /* Put packet into RBA */
    DPRINTF("Receive packet at %08x\n", (s->regs[SONIC_CRBA1] << 16) | s->regs[SONIC_CRBA0]);
    address = (s->regs[SONIC_CRBA1] << 16) | s->regs[SONIC_CRBA0];
    s->memory_rw(s->mem_opaque, address, (uint8_t*)buf, rx_len, 1);
    address += rx_len;
    s->memory_rw(s->mem_opaque, address, (uint8_t*)&checksum, 4, 1);
    rx_len += 4;
    s->regs[SONIC_CRBA1] = address >> 16;
    s->regs[SONIC_CRBA0] = address & 0xffff;
    available = (s->regs[SONIC_RBWC1] << 16) | s->regs[SONIC_RBWC0];
    available -= rx_len / 2;
    s->regs[SONIC_RBWC1] = available >> 16;
    s->regs[SONIC_RBWC0] = available & 0xffff;

    /* Update status */
    if (((s->regs[SONIC_RBWC1] << 16) | s->regs[SONIC_RBWC0]) < s->regs[SONIC_EOBC]) {
        s->regs[SONIC_RCR] |= SONIC_RCR_LPKT;
    }
    s->regs[SONIC_RCR] |= packet_type;
    s->regs[SONIC_RCR] |= SONIC_RCR_PRX;
    if (s->loopback_packet) {
        s->regs[SONIC_RCR] |= SONIC_RCR_LBK;
        s->loopback_packet = 0;
    }

    /* Write status to memory */
    DPRINTF("Write status at %08x\n", (s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]);
    data[0 * width] = s->regs[SONIC_RCR]; /* status */
    data[1 * width] = rx_len; /* byte count */
    data[2 * width] = s->regs[SONIC_TRBA0]; /* pkt_ptr0 */
    data[3 * width] = s->regs[SONIC_TRBA1]; /* pkt_ptr1 */
    data[4 * width] = s->regs[SONIC_RSC]; /* seq_no */
    size = sizeof(uint16_t) * 5 * width;
    s->memory_rw(s->mem_opaque, (s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA], (uint8_t *)data, size, 1);

    /* Move to next descriptor */
    size = sizeof(uint16_t) * width;
    s->memory_rw(s->mem_opaque,
        ((s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]) + sizeof(uint16_t) * 5 * width,
        (uint8_t *)data, size, 0);
    s->regs[SONIC_LLFA] = data[0 * width];
    if (s->regs[SONIC_LLFA] & 0x1) {
        /* EOL detected */
        s->regs[SONIC_ISR] |= SONIC_ISR_RDE;
    } else {
        data[0 * width] = 0; /* in_use */
        s->memory_rw(s->mem_opaque,
            ((s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]) + sizeof(uint16_t) * 6 * width,
            (uint8_t *)data, size, 1);
        s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
        s->regs[SONIC_ISR] |= SONIC_ISR_PKTRX;
        s->regs[SONIC_RSC] = (s->regs[SONIC_RSC] & 0xff00) | (((s->regs[SONIC_RSC] & 0x00ff) + 1) & 0x00ff);

//.........这里部分代码省略.........

uint32_t zlib_crc32_calculate(const uint8_t *data, size_t length)
{
   return crc32(0, data, length);
}

int SignatureLoad(SECURITY_INFO *pBufferAddr)
{
    int ret = -1;
    int flag1=0, flag2=0;    
    unsigned int u32SigOffset = 0;
    unsigned int u32SigBkOffset = 0;     
    unsigned int u32SecuritySize= 0;
    UBOOT_TRACE("IN\n");

    //Here, we check the CRC of SECUREITY_INFO, and the check range include "pBufferAddr->data" and "pBufferAddr->data_interleave"
    u32SecuritySize = sizeof(_SECURITY_INFO_DATA) * NUMBER_OF_SECURE_INFO;

    if(pBufferAddr==NULL)
    {
        UBOOT_ERROR("The input parameter pBufferAddr' is a null pointer\n");
        return -1;
    }

    ret = raw_io_config(FLASH_DEFAULT_TARGET,FLASH_DEFAULT_PARTITION,FLASH_DEFAULT_VOLUME);
    if(ret != 0)
    {
        UBOOT_ERROR("raw_io_config setting fail!\n");
        return -1;
    }

    ret = get_signature_offset(&u32SigOffset,&u32SigBkOffset);
    if(ret != 0)
    {
        UBOOT_ERROR("get_signature_offset fail!\n");
        return -1;
    }
   
    ret = raw_read((unsigned int)pBufferAddr,u32SigOffset,sizeof(SECURITY_INFO));
    
    if( (EN_SUCCESS == ret) && (pBufferAddr->crc == crc32(0, (unsigned char const *)&pBufferAddr->data,u32SecuritySize)) )
        flag1=1;
    
    ret = raw_read((unsigned int)pBufferAddr,u32SigBkOffset,sizeof(SECURITY_INFO));
    
    if( (EN_SUCCESS == ret) && (pBufferAddr->crc == crc32(0, (unsigned char const *)&pBufferAddr->data,u32SecuritySize)) )
        flag2=1;

    if( (flag2==0) && (flag1!=0) )
    {
        ret = raw_read((unsigned int)pBufferAddr,u32SigOffset,sizeof(SECURITY_INFO));
        if( (EN_SUCCESS == ret) && (pBufferAddr->crc == crc32(0, (unsigned char const *)&pBufferAddr->data,u32SecuritySize)))
        {
            ret = raw_write((unsigned int)pBufferAddr,u32SigBkOffset,sizeof(SECURITY_INFO));
        }
        else
        {
            UBOOT_ERROR("raw_read fail or caculate crc fail!\n");
            return -1;
        }
    }

    if((flag1==0)&&(flag2!=0))
    {
        ret = raw_write((unsigned int)pBufferAddr,u32SigOffset,sizeof(SECURITY_INFO));
    }

   if(EN_SUCCESS == ret)
   {
       ret=0;
       UBOOT_TRACE("OK\n");
   }
   else
   {
       ret=-1;
       UBOOT_ERROR("SignatureLoad fail\n");
   }

   return ret;
}

static int Load(const char *name, MDFNFILE *fp)
{
 uint32 headerlen = 0;
 uint32 r_size;

 IsHES = 0;
 IsSGX = 0;

 /*if(!memcmp(fp->data, "HESM", 4))
  IsHES = 1;*/

 LoadCommonPre();

 if(!IsHES)
 {
  if(fp->size & 0x200) // 512 byte header!
   headerlen = 512;
 }

 r_size = fp->size - headerlen;
 if(r_size > 4096 * 1024) r_size = 4096 * 1024;

 for(int x = 0; x < 0x100; x++)
 {
  PCERead[x] = PCEBusRead;
  PCEWrite[x] = PCENullWrite;
 }

 uint32 crc = crc32(0, fp->data + headerlen, fp->size - headerlen);


 if(IsHES)
 {
  if(!PCE_HESLoad(fp->data, fp->size))
   return(0);
 }
 else
  HuCLoad(fp->data + headerlen, fp->size - headerlen, crc);

 if(!strcasecmp(fp->ext, "sgx"))
  IsSGX = TRUE;

 if(fp->size >= 8192 && !memcmp(fp->data + headerlen, "DARIUS Version 1.11b", strlen("DARIUS VERSION 1.11b")))
 {
  MDFN_printf("SuperGfx:  Darius Plus\n");
  IsSGX = 1;
 }

 if(crc == 0x4c2126b0)
 {
  MDFN_printf("SuperGfx:  Aldynes\n");
  IsSGX = 1;
 }

 if(crc == 0x8c4588e2)
 {
  MDFN_printf("SuperGfx:  1941 - Counter Attack\n");
  IsSGX = 1;
 }
 if(crc == 0x1f041166)
 {
  MDFN_printf("SuperGfx:  Madouou Granzort\n");
  IsSGX = 1;
 }
 if(crc == 0xb486a8ed)
 {
  MDFN_printf("SuperGfx:  Daimakaimura\n");
  IsSGX = 1;
 }
 if(crc == 0x3b13af61)
 {
  MDFN_printf("SuperGfx:  Battle Ace\n");
  IsSGX = 1;
 }

 return(LoadCommon());
}

void do_bootm_linux (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
		     ulong addr, ulong *len_ptr, int verify)
{
	ulong len = 0, checksum;
	ulong initrd_start, initrd_end;
	ulong data;
	void (*theKernel)(int zero, int arch, uint params);
	image_header_t *hdr = &header;
	bd_t *bd = gd->bd;

#ifdef CONFIG_CMDLINE_TAG
	char *commandline = getenv ("bootargs");
#endif

	theKernel = (void (*)(int, int, uint))ntohl(hdr->ih_ep);

	/*
	 * Check if there is an initrd image
	 */
	if (argc >= 3) {
		show_boot_progress (9);

		addr = simple_strtoul (argv[2], NULL, 16);

		printf ("## Loading Ramdisk Image at %08lx ...\n", addr);

		/* Copy header so we can blank CRC field for re-calculation */
#ifdef CONFIG_HAS_DATAFLASH
		if (addr_dataflash (addr)) {
			read_dataflash (addr, sizeof (image_header_t),
					(char *) &header);
		} else
#endif
			memcpy (&header, (char *) addr,
				sizeof (image_header_t));

		if (ntohl (hdr->ih_magic) != IH_MAGIC) {
			printf ("Bad Magic Number\n");
			show_boot_progress (-10);
			do_reset (cmdtp, flag, argc, argv);
		}

		data = (ulong) & header;
		len = sizeof (image_header_t);

		checksum = ntohl (hdr->ih_hcrc);
		hdr->ih_hcrc = 0;

		if (crc32 (0, (unsigned char *) data, len) != checksum) {
			printf ("Bad Header Checksum\n");
			show_boot_progress (-11);
			do_reset (cmdtp, flag, argc, argv);
		}

		show_boot_progress (10);

		print_image_hdr (hdr);

		data = addr + sizeof (image_header_t);
		len = ntohl (hdr->ih_size);

#ifdef CONFIG_HAS_DATAFLASH
		if (addr_dataflash (addr)) {
			read_dataflash (data, len, (char *) CFG_LOAD_ADDR);
			data = CFG_LOAD_ADDR;
		}
#endif

		if (verify) {
			ulong csum = 0;

			printf ("   Verifying Checksum ... ");
			csum = crc32 (0, (unsigned char *) data, len);
			if (csum != ntohl (hdr->ih_dcrc)) {
				printf ("Bad Data CRC\n");
				show_boot_progress (-12);
				do_reset (cmdtp, flag, argc, argv);
			}
			printf ("OK\n");
		}

		show_boot_progress (11);

		if ((hdr->ih_os != IH_OS_LINUX) ||
		    (hdr->ih_arch != IH_CPU_ARM) ||
		    (hdr->ih_type != IH_TYPE_RAMDISK)) {
			printf ("No Linux ARM Ramdisk Image\n");
			show_boot_progress (-13);
			do_reset (cmdtp, flag, argc, argv);
		}

#if defined(CONFIG_B2) || defined(CONFIG_EVB4510) || defined(CONFIG_ARMADILLO)
		/*
		 *we need to copy the ramdisk to SRAM to let Linux boot
		 */
		memmove ((void *) ntohl(hdr->ih_load), (uchar *)data, len);
		data = ntohl(hdr->ih_load);
#endif /* CONFIG_B2 || CONFIG_EVB4510 */

		/*
//.........这里部分代码省略.........

static int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
{
	struct jffs2_full_dnode *old_metadata, *new_metadata;
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
	struct jffs2_raw_inode *ri;
	unsigned short dev;
	unsigned char *mdata = NULL;
	int mdatalen = 0;
	unsigned int ivalid;
	uint32_t phys_ofs, alloclen;
	int ret;
	D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu\n", inode->i_ino));
	ret = inode_change_ok(inode, iattr);
	if (ret) 
		return ret;

	/* Special cases - we don't want more than one data node
	   for these types on the medium at any time. So setattr
	   must read the original data associated with the node
	   (i.e. the device numbers or the target name) and write
	   it out again with the appropriate data attached */
	if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) {
		/* For these, we don't actually need to read the old node */
		dev = old_encode_dev(inode->i_rdev);
		mdata = (char *)&dev;
		mdatalen = sizeof(dev);
		D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen));
	} else if (S_ISLNK(inode->i_mode)) {
		mdatalen = f->metadata->size;
		mdata = kmalloc(f->metadata->size, GFP_USER);
		if (!mdata)
			return -ENOMEM;
		ret = jffs2_read_dnode(c, f->metadata, mdata, 0, mdatalen);
		if (ret) {
			kfree(mdata);
			return ret;
		}
		D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target\n", mdatalen));
	}

	ri = jffs2_alloc_raw_inode();
	if (!ri) {
		if (S_ISLNK(inode->i_mode))
			kfree(mdata);
		return -ENOMEM;
	}
		
	ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &phys_ofs, &alloclen, ALLOC_NORMAL);
	if (ret) {
		jffs2_free_raw_inode(ri);
		if (S_ISLNK(inode->i_mode & S_IFMT))
			 kfree(mdata);
		return ret;
	}
	down(&f->sem);
	ivalid = iattr->ia_valid;
	
	ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
	ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen);
	ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));

	ri->ino = cpu_to_je32(inode->i_ino);
	ri->version = cpu_to_je32(++f->highest_version);

	ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid);
	ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid);

	if (ivalid & ATTR_MODE)
		if (iattr->ia_mode & S_ISGID &&
		    !in_group_p(je16_to_cpu(ri->gid)) && !capable(CAP_FSETID))
			ri->mode = cpu_to_jemode(iattr->ia_mode & ~S_ISGID);
		else 
			ri->mode = cpu_to_jemode(iattr->ia_mode);
	else
		ri->mode = cpu_to_jemode(inode->i_mode);


	ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size);
	ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime));
	ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime));
	ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime));

	ri->offset = cpu_to_je32(0);
	ri->csize = ri->dsize = cpu_to_je32(mdatalen);
	ri->compr = JFFS2_COMPR_NONE;
	if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
		/* It's an extension. Make it a hole node */
		ri->compr = JFFS2_COMPR_ZERO;
		ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size);
		ri->offset = cpu_to_je32(inode->i_size);
	}
	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
	if (mdatalen)
		ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen));
	else
		ri->data_crc = cpu_to_je32(0);

	new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, phys_ofs, ALLOC_NORMAL);
//.........这里部分代码省略.........

uBootParams_t::uBootParams_t( char const *fileName )
   : worked_( false )
   , head_ ( 0 )
   , dataMax_( 0 )
   , dataLen_( 0 )
   , dataBuf_( 0 )
{
   int fdDev = open( fileName, O_RDONLY );
   if( 0 > fdDev ){
      perror( fileName );
      return ;
   }

   long int eof = lseek( fdDev, 0, SEEK_END );
   if( 0 >= eof ){
      perror( "lseek" );
      close( fdDev );
      return ;
   }

   dataBuf_ = new char [eof+1];
   long int start = lseek( fdDev, 0, SEEK_SET );
   int numRead = read( fdDev, dataBuf_, eof );
   if( numRead != eof ){
      fprintf( stderr, "read:%d of %lu from pos %ld:%m\n", numRead, eof, start );
      delete [] dataBuf_ ;
      close( fdDev );
      return ;
   }
   dataBuf_[eof] = '\0' ;

#ifdef __arm__
   uLong crc ; memcpy(&crc,dataBuf_,sizeof(crc));
   char const *nextIn = dataBuf_ + sizeof(crc);
   uLong computed = crc32( 0, (Bytef *)nextIn, eof-sizeof(crc) );

   if( crc == computed ){
      worked_ = true ;
      char * const dataEnd = dataBuf_+eof ;
      while( (nextIn < dataEnd) && *nextIn ){
         char const *nameStart = nextIn ;
         char c ;
         char const *nameEnd = 0 ;
         while( (nextIn < dataEnd) && ('\0' != (c=*nextIn)) ){
            if( '=' == c ){
               nameEnd = nextIn++ ;
               break;
            }
            else
               nextIn++ ;
         }
         if( nameEnd ){
            char const *valueStart = nextIn ;
            while( (nextIn < dataEnd) && ('\0' != (c=*nextIn)) ){
               nextIn++ ;
            }
            if( (nextIn < dataEnd) && ('\0' == c) ){
               nextIn++ ;
               *(char *)nameEnd = 0 ;
               listItem_t *item = new listItem_t ;
               item->next_ = head_ ;
               item->name_ = nameStart ;
               item->value_ = valueStart ;
               head_ = item ;
            }
            else {
               fprintf( stderr, "unexpected end-of-data\n" );
               worked_ = false ;
               break;
            }
         }
         else {
            fprintf( stderr, "unexpected end-of-name\n" );
            worked_ = false ;
            break;
         }
      }
   } else if( (0xffffffff == crc) && ('\xff' == *nextIn) ){
      memset( dataBuf_, 0, dataMax_ 
#ifndef __arm__
              + sizeof(crc)
#endif
              );
      worked_ = true ;
   }
   else {
      fprintf( stderr, "U-Boot crc mismatch: read 0x%08lx, computed 0x%08lx\n", crc, computed );
   }
#else
   worked_ = true ;
   char * const dataEnd = dataBuf_+eof ;
   char *nextIn = dataBuf_ ;
   while( (nextIn < dataEnd) && *nextIn ){
      char const *nameStart = nextIn ;
      char c ;
      char const *nameEnd = 0 ;
      while( (nextIn < dataEnd) && ('\n' != (c=*nextIn)) ){
         if( '=' == c ){
            nameEnd = nextIn++ ;
            break;
//.........这里部分代码省略.........

bool uBootParams_t::save( char const *fileName )
{
   bool worked = false ;
   int mode = 
#ifdef __arm__
               O_WRONLY ;
#else
               O_WRONLY | O_CREAT ;
#endif
   int fd = open( fileName, mode );
   if( 0 <= fd )
   {
      char *const writeable = new char [dataMax_];
      memset( writeable, 0, dataMax_ );
      uLong crc ;
      char *nextOut = writeable + sizeof(crc);
      listItem_t *item = head_ ;
      while( item ){
         printf( "%s==%s\n", item->name_, item->value_ );
         unsigned len = strlen(item->name_);
         memcpy(nextOut,item->name_,len);
         nextOut += len ;
         *nextOut++ = '=' ;
         len = strlen(item->value_);
         strcpy(nextOut,item->value_);
         nextOut += len + 1 ; // skip NULL
         item = item->next_ ;
      }
      if( nextOut > writeable+dataMax_){
         fprintf( stderr, "EOF error: %p > %p(%u)\n", nextOut, writeable+dataMax_, dataMax_);
         hexDumper_t dumper(writeable,nextOut-writeable,(unsigned long)writeable);
         while( dumper.nextLine() )
            printf( "%s\n", dumper.getLine() );
         assert(nextOut <= writeable+dataMax_);
      }
      crc = crc32( 0, (Bytef *)writeable+sizeof(crc), dataMax_-sizeof(crc));
      memcpy(writeable,&crc,sizeof(crc));

#ifdef __arm__
      bool bDevice = isDevice(fileName);
      if (bDevice) {
         mtd_info_t meminfo;
         if( 0 == ioctl( fd, MEMGETINFO, (unsigned long)&meminfo) )
         {
            if( (meminfo.erasesize <= dataMax_) 
                && 
                (0 == (dataMax_%meminfo.erasesize)) )
            {
               erase_info_t erase;
               erase.start = 0 ;
               erase.length = meminfo.erasesize;
               worked = true ;
               while( worked && (erase.start < dataMax_) ){
                  if( 0 == ioctl( fd, MEMERASE, (unsigned long)&erase) )
                  {
                     erase.start += meminfo.erasesize ;
                  }
                  else {
                     fprintf( stderr, "erase error %m\n" );
                     worked = false ;
                  }
               }

               if( worked ){
                  if( 0 == (unsigned)lseek( fd, 0, SEEK_SET ) )
                  {
                     unsigned numWritten = write( fd, writeable, dataMax_ );
   
                     worked = (numWritten == dataMax_ );
                  }
                  else {
                     worked = false ;
                     perror( "lseek3" );
                  }
               }
            }
            else
               fprintf( stderr, "erase size mismatch: rv %u, mi %u\n", dataMax_, meminfo.erasesize );
         }
         else
            perror( "MEMGETINFO" );
      } else {
#endif
         int numWritten = write( fd, writeable, dataMax_ );
         worked = (numWritten == dataMax_);
         if( !worked )
            perror( fileName );
#ifdef __arm__
      } // not device on ARM
#endif
      delete [] writeable ;
      close( fd );
   }
   else
      perror( fileName );

   return worked ;
}

/* Reset the CRC variable to 32 bits of 1's.  Care must be taken
 * in case CRC is > 32 bits to leave the top bits 0.
 */
void /* PRIVATE */
png_reset_crc(png_structp png_ptr)
{
   png_ptr->crc = crc32(0, Z_NULL, 0);
}

void env_crc_update (void)
{
	env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
}