brec.c

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    1 /*
    2  *  linux/fs/hfsplus/brec.c
    3  *
    4  * Copyright (C) 2001
    5  * Brad Boyer (flar@allandria.com)
    6  * (C) 2003 Ardis Technologies <roman@ardistech.com>
    7  *
    8  * Handle individual btree records
    9  */
   10 
   11 #include "hfsplus_fs.h"
   12 #include "hfsplus_raw.h"
   13 
   14 /* Get the length and offset of the given record in the given node */
   15 u16 hfsplus_brec_lenoff(hfsplus_bnode *node, u16 rec, u16 *off)
   16 {
   17         u16 retval[2];
   18         u16 dataoff;
   19 
   20         dataoff = node->tree->node_size - (rec + 2) * 2;
   21         hfsplus_bnode_readbytes(node, retval, dataoff, 4);
   22         *off = be16_to_cpu(retval[1]);
   23         return be16_to_cpu(retval[0]) - *off;
   24 }
   25 
   26 /* Get the length of the key from a keyed record */
   27 u16 hfsplus_brec_keylen(hfsplus_bnode *node, u16 rec)
   28 {
   29         u16 klsz, retval, recoff;
   30         unsigned char buf[2];
   31 
   32         if ((node->kind != HFSPLUS_NODE_NDX)&&(node->kind != HFSPLUS_NODE_LEAF))
   33                 return 0;
   34 
   35         klsz = (node->tree->attributes & HFSPLUS_TREE_BIGKEYS) ? 2 : 1;
   36         if ((node->kind == HFSPLUS_NODE_NDX) &&
   37            !(node->tree->attributes & HFSPLUS_TREE_VAR_NDXKEY_SIZE)) {
   38                 retval = node->tree->max_key_len;
   39         } else {
   40                 recoff = hfsplus_bnode_read_u16(node, node->tree->node_size - (rec + 1) * 2);
   41                 if (!recoff)
   42                         return 0;
   43                 hfsplus_bnode_readbytes(node, buf, recoff, klsz);
   44                 if (klsz == 1)
   45                         retval = buf[0];
   46                 else
   47                         retval = be16_to_cpu(*(u16 *)buf);
   48         }
   49         return (retval + klsz + 1) & 0xFFFE;
   50 }

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FreeBSD/Linux Kernel Cross Reference sys/fs/hfsplus/brec.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/hfsplus/brec.c