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134 lines
2.7 KiB
C
134 lines
2.7 KiB
C
#ifndef jffs2_private_h
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#define jffs2_private_h
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#include <jffs2/jffs2.h>
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struct b_node {
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struct b_node *next;
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};
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struct b_inode {
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struct b_inode *next;
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u32 offset; /* physical offset to beginning of real inode */
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u32 version;
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u32 ino;
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u32 isize;
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u32 csize;
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};
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struct b_dirent {
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struct b_dirent *next;
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u32 offset; /* physical offset to beginning of real dirent */
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u32 version;
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u32 pino;
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u32 ino;
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unsigned int nhash;
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unsigned char nsize;
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unsigned char type;
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};
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struct b_list {
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struct b_node *listTail;
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struct b_node *listHead;
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unsigned int listCount;
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struct mem_block *listMemBase;
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};
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struct b_lists {
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char *partOffset;
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struct b_list dir;
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struct b_list frag;
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};
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struct b_compr_info {
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u32 num_frags;
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u32 compr_sum;
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u32 decompr_sum;
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};
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struct b_jffs2_info {
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struct b_compr_info compr_info[JFFS2_NUM_COMPR];
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};
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static inline int
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hdr_crc(struct jffs2_unknown_node *node)
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{
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#if 1
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u32 crc = crc32_no_comp(0, (unsigned char *)node, sizeof(struct jffs2_unknown_node) - 4);
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#else
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/* what's the semantics of this? why is this here? */
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u32 crc = crc32_no_comp(~0, (unsigned char *)node, sizeof(struct jffs2_unknown_node) - 4);
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crc ^= ~0;
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#endif
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if (node->hdr_crc != crc) {
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return 0;
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} else {
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return 1;
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}
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}
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static inline int
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dirent_crc(struct jffs2_raw_dirent *node)
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{
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if (node->node_crc != crc32_no_comp(0, (unsigned char *)node, sizeof(struct jffs2_raw_dirent) - 8)) {
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return 0;
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} else {
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return 1;
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}
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}
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static inline int
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dirent_name_crc(struct jffs2_raw_dirent *node)
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{
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if (node->name_crc != crc32_no_comp(0, (unsigned char *)&(node->name), node->nsize)) {
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return 0;
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} else {
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return 1;
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}
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}
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static inline int
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inode_crc(struct jffs2_raw_inode *node)
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{
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if (node->node_crc != crc32_no_comp(0, (unsigned char *)node, sizeof(struct jffs2_raw_inode) - 8)) {
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return 0;
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} else {
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return 1;
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}
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}
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/* Borrowed from include/linux/dcache.h */
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/* Name hashing routines. Initial hash value */
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/* Hash courtesy of the R5 hash in reiserfs modulo sign bits */
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#define init_name_hash() 0
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/* partial hash update function. Assume roughly 4 bits per character */
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static inline unsigned long
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partial_name_hash(unsigned long c, unsigned long prevhash)
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{
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return (prevhash + (c << 4) + (c >> 4)) * 11;
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}
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/*
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* Finally: cut down the number of bits to a int value (and try to avoid
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* losing bits)
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*/
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static inline unsigned long end_name_hash(unsigned long hash)
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{
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return (unsigned int) hash;
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}
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/* Compute the hash for a name string. */
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static inline unsigned int
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full_name_hash(const unsigned char *name, unsigned int len)
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{
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unsigned long hash = init_name_hash();
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while (len--)
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hash = partial_name_hash(*name++, hash);
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return end_name_hash(hash);
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}
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#endif /* jffs2_private.h */
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