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242 lines
5.8 KiB
242 lines
5.8 KiB
/* |
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* directory.c |
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* |
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* PURPOSE |
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* Directory related functions |
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* |
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* COPYRIGHT |
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* This file is distributed under the terms of the GNU General Public |
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* License (GPL). Copies of the GPL can be obtained from: |
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* ftp://prep.ai.mit.edu/pub/gnu/GPL |
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* Each contributing author retains all rights to their own work. |
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*/ |
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#include "udfdecl.h" |
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#include "udf_i.h" |
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#include <linux/fs.h> |
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#include <linux/string.h> |
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#include <linux/bio.h> |
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struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos, |
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struct udf_fileident_bh *fibh, |
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struct fileIdentDesc *cfi, |
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struct extent_position *epos, |
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struct kernel_lb_addr *eloc, uint32_t *elen, |
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sector_t *offset) |
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{ |
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struct fileIdentDesc *fi; |
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int i, num; |
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udf_pblk_t block; |
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struct buffer_head *tmp, *bha[16]; |
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struct udf_inode_info *iinfo = UDF_I(dir); |
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fibh->soffset = fibh->eoffset; |
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
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fi = udf_get_fileident(iinfo->i_data - |
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(iinfo->i_efe ? |
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sizeof(struct extendedFileEntry) : |
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sizeof(struct fileEntry)), |
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dir->i_sb->s_blocksize, |
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&(fibh->eoffset)); |
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if (!fi) |
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return NULL; |
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*nf_pos += fibh->eoffset - fibh->soffset; |
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memcpy((uint8_t *)cfi, (uint8_t *)fi, |
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sizeof(struct fileIdentDesc)); |
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return fi; |
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} |
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if (fibh->eoffset == dir->i_sb->s_blocksize) { |
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uint32_t lextoffset = epos->offset; |
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unsigned char blocksize_bits = dir->i_sb->s_blocksize_bits; |
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if (udf_next_aext(dir, epos, eloc, elen, 1) != |
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(EXT_RECORDED_ALLOCATED >> 30)) |
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return NULL; |
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block = udf_get_lb_pblock(dir->i_sb, eloc, *offset); |
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(*offset)++; |
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if ((*offset << blocksize_bits) >= *elen) |
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*offset = 0; |
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else |
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epos->offset = lextoffset; |
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brelse(fibh->sbh); |
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fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); |
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if (!fibh->sbh) |
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return NULL; |
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fibh->soffset = fibh->eoffset = 0; |
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if (!(*offset & ((16 >> (blocksize_bits - 9)) - 1))) { |
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i = 16 >> (blocksize_bits - 9); |
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if (i + *offset > (*elen >> blocksize_bits)) |
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i = (*elen >> blocksize_bits)-*offset; |
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for (num = 0; i > 0; i--) { |
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block = udf_get_lb_pblock(dir->i_sb, eloc, |
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*offset + i); |
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tmp = udf_tgetblk(dir->i_sb, block); |
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if (tmp && !buffer_uptodate(tmp) && |
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!buffer_locked(tmp)) |
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bha[num++] = tmp; |
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else |
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brelse(tmp); |
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} |
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if (num) { |
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ll_rw_block(REQ_OP_READ, REQ_RAHEAD, num, bha); |
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for (i = 0; i < num; i++) |
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brelse(bha[i]); |
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} |
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} |
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} else if (fibh->sbh != fibh->ebh) { |
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brelse(fibh->sbh); |
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fibh->sbh = fibh->ebh; |
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} |
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fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize, |
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&(fibh->eoffset)); |
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if (!fi) |
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return NULL; |
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*nf_pos += fibh->eoffset - fibh->soffset; |
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if (fibh->eoffset <= dir->i_sb->s_blocksize) { |
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memcpy((uint8_t *)cfi, (uint8_t *)fi, |
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sizeof(struct fileIdentDesc)); |
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} else if (fibh->eoffset > dir->i_sb->s_blocksize) { |
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uint32_t lextoffset = epos->offset; |
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if (udf_next_aext(dir, epos, eloc, elen, 1) != |
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(EXT_RECORDED_ALLOCATED >> 30)) |
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return NULL; |
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block = udf_get_lb_pblock(dir->i_sb, eloc, *offset); |
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(*offset)++; |
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if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen) |
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*offset = 0; |
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else |
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epos->offset = lextoffset; |
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fibh->soffset -= dir->i_sb->s_blocksize; |
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fibh->eoffset -= dir->i_sb->s_blocksize; |
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fibh->ebh = udf_tread(dir->i_sb, block); |
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if (!fibh->ebh) |
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return NULL; |
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if (sizeof(struct fileIdentDesc) > -fibh->soffset) { |
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int fi_len; |
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memcpy((uint8_t *)cfi, (uint8_t *)fi, -fibh->soffset); |
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memcpy((uint8_t *)cfi - fibh->soffset, |
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fibh->ebh->b_data, |
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sizeof(struct fileIdentDesc) + fibh->soffset); |
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fi_len = udf_dir_entry_len(cfi); |
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*nf_pos += fi_len - (fibh->eoffset - fibh->soffset); |
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fibh->eoffset = fibh->soffset + fi_len; |
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} else { |
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memcpy((uint8_t *)cfi, (uint8_t *)fi, |
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sizeof(struct fileIdentDesc)); |
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} |
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} |
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/* Got last entry outside of dir size - fs is corrupted! */ |
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if (*nf_pos > dir->i_size) |
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return NULL; |
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return fi; |
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} |
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struct fileIdentDesc *udf_get_fileident(void *buffer, int bufsize, int *offset) |
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{ |
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struct fileIdentDesc *fi; |
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int lengthThisIdent; |
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uint8_t *ptr; |
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int padlen; |
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if ((!buffer) || (!offset)) { |
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udf_debug("invalidparms, buffer=%p, offset=%p\n", |
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buffer, offset); |
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return NULL; |
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} |
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ptr = buffer; |
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if ((*offset > 0) && (*offset < bufsize)) |
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ptr += *offset; |
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fi = (struct fileIdentDesc *)ptr; |
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if (fi->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FID)) { |
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udf_debug("0x%x != TAG_IDENT_FID\n", |
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le16_to_cpu(fi->descTag.tagIdent)); |
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udf_debug("offset: %d sizeof: %lu bufsize: %d\n", |
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*offset, (unsigned long)sizeof(struct fileIdentDesc), |
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bufsize); |
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return NULL; |
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} |
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if ((*offset + sizeof(struct fileIdentDesc)) > bufsize) |
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lengthThisIdent = sizeof(struct fileIdentDesc); |
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else |
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lengthThisIdent = sizeof(struct fileIdentDesc) + |
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fi->lengthFileIdent + le16_to_cpu(fi->lengthOfImpUse); |
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/* we need to figure padding, too! */ |
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padlen = lengthThisIdent % UDF_NAME_PAD; |
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if (padlen) |
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lengthThisIdent += (UDF_NAME_PAD - padlen); |
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*offset = *offset + lengthThisIdent; |
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return fi; |
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} |
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struct short_ad *udf_get_fileshortad(uint8_t *ptr, int maxoffset, uint32_t *offset, |
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int inc) |
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{ |
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struct short_ad *sa; |
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if ((!ptr) || (!offset)) { |
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pr_err("%s: invalidparms\n", __func__); |
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return NULL; |
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} |
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if ((*offset + sizeof(struct short_ad)) > maxoffset) |
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return NULL; |
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else { |
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sa = (struct short_ad *)ptr; |
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if (sa->extLength == 0) |
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return NULL; |
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} |
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if (inc) |
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*offset += sizeof(struct short_ad); |
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return sa; |
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} |
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struct long_ad *udf_get_filelongad(uint8_t *ptr, int maxoffset, uint32_t *offset, int inc) |
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{ |
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struct long_ad *la; |
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if ((!ptr) || (!offset)) { |
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pr_err("%s: invalidparms\n", __func__); |
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return NULL; |
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} |
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if ((*offset + sizeof(struct long_ad)) > maxoffset) |
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return NULL; |
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else { |
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la = (struct long_ad *)ptr; |
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if (la->extLength == 0) |
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return NULL; |
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} |
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if (inc) |
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*offset += sizeof(struct long_ad); |
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return la; |
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}
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