| /* |
| * directory.c |
| * |
| * PURPOSE |
| * Directory related functions |
| * |
| * CONTACTS |
| * E-mail regarding any portion of the Linux UDF file system should be |
| * directed to the development team mailing list (run by majordomo): |
| * linux_udf@hpesjro.fc.hp.com |
| * |
| * COPYRIGHT |
| * This file is distributed under the terms of the GNU General Public |
| * License (GPL). Copies of the GPL can be obtained from: |
| * ftp://prep.ai.mit.edu/pub/gnu/GPL |
| * Each contributing author retains all rights to their own work. |
| */ |
| |
| #include "udfdecl.h" |
| |
| #if defined(__linux__) && defined(__KERNEL__) |
| |
| #include <linux/fs.h> |
| #include <linux/string.h> |
| #include <linux/udf_fs.h> |
| |
| #else |
| |
| #include <sys/types.h> |
| #include <stdio.h> |
| #include <unistd.h> |
| |
| #endif |
| |
| #ifdef __KERNEL__ |
| |
| Uint8 * udf_filead_read(struct inode *dir, Uint8 *tmpad, Uint8 ad_size, |
| lb_addr fe_loc, int *pos, int *offset, struct buffer_head **bh, int *error) |
| { |
| int loffset = *offset; |
| int block; |
| Uint8 *ad; |
| int remainder; |
| |
| *error = 0; |
| |
| ad = (Uint8 *)(*bh)->b_data + *offset; |
| *offset += ad_size; |
| |
| if (!ad) |
| { |
| udf_release_data(*bh); |
| *error = 1; |
| return NULL; |
| } |
| |
| if (*offset == dir->i_sb->s_blocksize) |
| { |
| udf_release_data(*bh); |
| block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos); |
| if (!block) |
| return NULL; |
| if (!(*bh = udf_tread(dir->i_sb, block, dir->i_sb->s_blocksize))) |
| return NULL; |
| } |
| else if (*offset > dir->i_sb->s_blocksize) |
| { |
| ad = tmpad; |
| |
| remainder = dir->i_sb->s_blocksize - loffset; |
| memcpy((Uint8 *)ad, (*bh)->b_data + loffset, remainder); |
| |
| udf_release_data(*bh); |
| block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos); |
| if (!block) |
| return NULL; |
| if (!((*bh) = udf_tread(dir->i_sb, block, dir->i_sb->s_blocksize))) |
| return NULL; |
| |
| memcpy((Uint8 *)ad + remainder, (*bh)->b_data, ad_size - remainder); |
| *offset = ad_size - remainder; |
| } |
| return ad; |
| } |
| |
| struct FileIdentDesc * |
| udf_fileident_read(struct inode *dir, loff_t *nf_pos, |
| struct udf_fileident_bh *fibh, |
| struct FileIdentDesc *cfi, |
| lb_addr *bloc, Uint32 *extoffset, |
| lb_addr *eloc, Uint32 *elen, |
| Uint32 *offset, struct buffer_head **bh) |
| { |
| struct FileIdentDesc *fi; |
| int i, num, block; |
| struct buffer_head * tmp, * bha[16]; |
| |
| fibh->soffset = fibh->eoffset; |
| |
| if (fibh->eoffset == dir->i_sb->s_blocksize) |
| { |
| int lextoffset = *extoffset; |
| |
| if (udf_next_aext(dir, bloc, extoffset, eloc, elen, bh, 1) != |
| EXTENT_RECORDED_ALLOCATED) |
| { |
| return NULL; |
| } |
| |
| block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset); |
| |
| (*offset) ++; |
| |
| if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen) |
| *offset = 0; |
| else |
| *extoffset = lextoffset; |
| |
| udf_release_data(fibh->sbh); |
| if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block, dir->i_sb->s_blocksize))) |
| return NULL; |
| fibh->soffset = fibh->eoffset = 0; |
| |
| if (!(*offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9))-1))) |
| { |
| i = 16 >> (dir->i_sb->s_blocksize_bits - 9); |
| if (i+*offset > (*elen >> dir->i_sb->s_blocksize_bits)) |
| i = (*elen >> dir->i_sb->s_blocksize_bits)-*offset; |
| for (num=0; i>0; i--) |
| { |
| block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset+i); |
| tmp = udf_tgetblk(dir->i_sb, block, dir->i_sb->s_blocksize); |
| if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp)) |
| bha[num++] = tmp; |
| else |
| brelse(tmp); |
| } |
| if (num) |
| { |
| ll_rw_block(READA, num, bha); |
| for (i=0; i<num; i++) |
| brelse(bha[i]); |
| } |
| } |
| } |
| else if (fibh->sbh != fibh->ebh) |
| { |
| udf_release_data(fibh->sbh); |
| fibh->sbh = fibh->ebh; |
| } |
| |
| fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize, |
| &(fibh->eoffset)); |
| |
| if (!fi) |
| return NULL; |
| |
| *nf_pos += ((fibh->eoffset - fibh->soffset) >> 2); |
| |
| if (fibh->eoffset <= dir->i_sb->s_blocksize) |
| { |
| memcpy((Uint8 *)cfi, (Uint8 *)fi, sizeof(struct FileIdentDesc)); |
| } |
| else if (fibh->eoffset > dir->i_sb->s_blocksize) |
| { |
| int lextoffset = *extoffset; |
| |
| if (udf_next_aext(dir, bloc, extoffset, eloc, elen, bh, 1) != |
| EXTENT_RECORDED_ALLOCATED) |
| { |
| return NULL; |
| } |
| |
| block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset); |
| |
| (*offset) ++; |
| |
| if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen) |
| *offset = 0; |
| else |
| *extoffset = lextoffset; |
| |
| fibh->soffset -= dir->i_sb->s_blocksize; |
| fibh->eoffset -= dir->i_sb->s_blocksize; |
| |
| if (!(fibh->ebh = udf_tread(dir->i_sb, block, dir->i_sb->s_blocksize))) |
| return NULL; |
| |
| if (sizeof(struct FileIdentDesc) > - fibh->soffset) |
| { |
| int fi_len; |
| |
| memcpy((Uint8 *)cfi, (Uint8 *)fi, - fibh->soffset); |
| memcpy((Uint8 *)cfi - fibh->soffset, fibh->ebh->b_data, |
| sizeof(struct FileIdentDesc) + fibh->soffset); |
| |
| fi_len = (sizeof(struct FileIdentDesc) + cfi->lengthFileIdent + |
| le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3; |
| |
| *nf_pos += ((fi_len - (fibh->eoffset - fibh->soffset)) >> 2); |
| fibh->eoffset = fibh->soffset + fi_len; |
| } |
| else |
| { |
| memcpy((Uint8 *)cfi, (Uint8 *)fi, sizeof(struct FileIdentDesc)); |
| } |
| } |
| return fi; |
| } |
| #endif |
| |
| struct FileIdentDesc * |
| udf_get_fileident(void * buffer, int bufsize, int * offset) |
| { |
| struct FileIdentDesc *fi; |
| int lengthThisIdent; |
| Uint8 * ptr; |
| int padlen; |
| |
| if ( (!buffer) || (!offset) ) { |
| #ifdef __KERNEL__ |
| udf_debug("invalidparms\n, buffer=%p, offset=%p\n", buffer, offset); |
| #endif |
| return NULL; |
| } |
| |
| ptr = buffer; |
| |
| if ( (*offset > 0) && (*offset < bufsize) ) { |
| ptr += *offset; |
| } |
| fi=(struct FileIdentDesc *)ptr; |
| if (le16_to_cpu(fi->descTag.tagIdent) != TID_FILE_IDENT_DESC) |
| { |
| #ifdef __KERNEL__ |
| udf_debug("0x%x != TID_FILE_IDENT_DESC\n", |
| le16_to_cpu(fi->descTag.tagIdent)); |
| udf_debug("offset: %u sizeof: %lu bufsize: %u\n", |
| *offset, (unsigned long)sizeof(struct FileIdentDesc), bufsize); |
| #endif |
| return NULL; |
| } |
| if ( (*offset + sizeof(struct FileIdentDesc)) > bufsize ) |
| { |
| lengthThisIdent = sizeof(struct FileIdentDesc); |
| } |
| else |
| lengthThisIdent = sizeof(struct FileIdentDesc) + |
| fi->lengthFileIdent + le16_to_cpu(fi->lengthOfImpUse); |
| |
| /* we need to figure padding, too! */ |
| padlen = lengthThisIdent % UDF_NAME_PAD; |
| if (padlen) |
| lengthThisIdent += (UDF_NAME_PAD - padlen); |
| *offset = *offset + lengthThisIdent; |
| |
| return fi; |
| } |
| |
| extent_ad * |
| udf_get_fileextent(void * buffer, int bufsize, int * offset) |
| { |
| extent_ad * ext; |
| struct FileEntry *fe; |
| Uint8 * ptr; |
| |
| if ( (!buffer) || (!offset) ) |
| { |
| #ifdef __KERNEL__ |
| printk(KERN_ERR "udf: udf_get_fileextent() invalidparms\n"); |
| #endif |
| return NULL; |
| } |
| |
| fe = (struct FileEntry *)buffer; |
| |
| if ( le16_to_cpu(fe->descTag.tagIdent) != TID_FILE_ENTRY ) |
| { |
| #ifdef __KERNEL__ |
| udf_debug("0x%x != TID_FILE_ENTRY\n", |
| le16_to_cpu(fe->descTag.tagIdent)); |
| #endif |
| return NULL; |
| } |
| |
| ptr=(Uint8 *)(fe->extendedAttr) + le32_to_cpu(fe->lengthExtendedAttr); |
| |
| if ( (*offset > 0) && (*offset < le32_to_cpu(fe->lengthAllocDescs)) ) |
| { |
| ptr += *offset; |
| } |
| |
| ext = (extent_ad *)ptr; |
| |
| *offset = *offset + sizeof(extent_ad); |
| return ext; |
| } |
| |
| short_ad * |
| udf_get_fileshortad(void * buffer, int maxoffset, int *offset, int inc) |
| { |
| short_ad * sa; |
| Uint8 * ptr; |
| |
| if ( (!buffer) || (!offset) ) |
| { |
| #ifdef __KERNEL__ |
| printk(KERN_ERR "udf: udf_get_fileshortad() invalidparms\n"); |
| #endif |
| return NULL; |
| } |
| |
| ptr = (Uint8 *)buffer; |
| |
| if ( (*offset > 0) && (*offset < maxoffset) ) |
| ptr += *offset; |
| else |
| return NULL; |
| |
| if ((sa = (short_ad *)ptr)->extLength == 0) |
| return NULL; |
| else if (inc) |
| (*offset) += sizeof(short_ad); |
| return sa; |
| } |
| |
| long_ad * |
| udf_get_filelongad(void * buffer, int maxoffset, int * offset, int inc) |
| { |
| long_ad * la; |
| Uint8 * ptr; |
| |
| if ( (!buffer) || !(offset) ) |
| { |
| #ifdef __KERNEL__ |
| printk(KERN_ERR "udf: udf_get_filelongad() invalidparms\n"); |
| #endif |
| return NULL; |
| } |
| |
| ptr = (Uint8 *)buffer; |
| |
| if ( (*offset > 0) && (*offset < maxoffset) ) |
| ptr += *offset; |
| else |
| return NULL; |
| |
| if ((la = (long_ad *)ptr)->extLength == 0) |
| return NULL; |
| else if (inc) |
| (*offset) += sizeof(long_ad); |
| return la; |
| } |