/* * directory.c * * PURPOSE * Directory related functions * * 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" #include "udf_i.h" #include <linux/fs.h> #include <linux/string.h> #include <linux/buffer_head.h> #if 0 static uint8_t * udf_filead_read(struct inode *dir, uint8_t *tmpad, uint8_t ad_size, kernel_lb_addr fe_loc, int *pos, int *offset, struct buffer_head **bh, int *error) { int loffset = *offset; int block; uint8_t *ad; int remainder; *error = 0; ad = (uint8_t *)(*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))) return NULL; } else if (*offset > dir->i_sb->s_blocksize) { ad = tmpad; remainder = dir->i_sb->s_blocksize - loffset; memcpy((uint8_t *)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))) return NULL; memcpy((uint8_t *)ad + remainder, (*bh)->b_data, ad_size - remainder); *offset = ad_size - remainder; } return ad; } #endif struct fileIdentDesc * udf_fileident_read(struct inode *dir, loff_t *nf_pos, struct udf_fileident_bh *fibh, struct fileIdentDesc *cfi, kernel_lb_addr *bloc, uint32_t *extoffset, kernel_lb_addr *eloc, uint32_t *elen, uint32_t *offset, struct buffer_head **bh) { struct fileIdentDesc *fi; int i, num, block; struct buffer_head * tmp, * bha[16]; fibh->soffset = fibh->eoffset; if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) { fi = udf_get_fileident(UDF_I_DATA(dir) - (UDF_I_EFE(dir) ? sizeof(struct extendedFileEntry) : sizeof(struct fileEntry)), dir->i_sb->s_blocksize, &(fibh->eoffset)); if (!fi) return NULL; *nf_pos += ((fibh->eoffset - fibh->soffset) >> 2); memcpy((uint8_t *)cfi, (uint8_t *)fi, sizeof(struct fileIdentDesc)); return fi; } if (fibh->eoffset == dir->i_sb->s_blocksize) { int lextoffset = *extoffset; if (udf_next_aext(dir, bloc, extoffset, eloc, elen, bh, 1) != (EXT_RECORDED_ALLOCATED >> 30)) { 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))) 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); 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_t *)cfi, (uint8_t *)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) != (EXT_RECORDED_ALLOCATED >> 30)) { 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))) return NULL; if (sizeof(struct fileIdentDesc) > - fibh->soffset) { int fi_len; memcpy((uint8_t *)cfi, (uint8_t *)fi, - fibh->soffset); memcpy((uint8_t *)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_t *)cfi, (uint8_t *)fi, sizeof(struct fileIdentDesc)); } } return fi; } struct fileIdentDesc * udf_get_fileident(void * buffer, int bufsize, int * offset) { struct fileIdentDesc *fi; int lengthThisIdent; uint8_t * ptr; int padlen; if ( (!buffer) || (!offset) ) { udf_debug("invalidparms\n, buffer=%p, offset=%p\n", buffer, offset); return NULL; } ptr = buffer; if ( (*offset > 0) && (*offset < bufsize) ) { ptr += *offset; } fi=(struct fileIdentDesc *)ptr; if (le16_to_cpu(fi->descTag.tagIdent) != TAG_IDENT_FID) { udf_debug("0x%x != TAG_IDENT_FID\n", le16_to_cpu(fi->descTag.tagIdent)); udf_debug("offset: %u sizeof: %lu bufsize: %u\n", *offset, (unsigned long)sizeof(struct fileIdentDesc), bufsize); 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; } #if 0 static extent_ad * udf_get_fileextent(void * buffer, int bufsize, int * offset) { extent_ad * ext; struct fileEntry *fe; uint8_t * ptr; if ( (!buffer) || (!offset) ) { printk(KERN_ERR "udf: udf_get_fileextent() invalidparms\n"); return NULL; } fe = (struct fileEntry *)buffer; if ( le16_to_cpu(fe->descTag.tagIdent) != TAG_IDENT_FE ) { udf_debug("0x%x != TAG_IDENT_FE\n", le16_to_cpu(fe->descTag.tagIdent)); return NULL; } ptr=(uint8_t *)(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; } #endif short_ad * udf_get_fileshortad(uint8_t *ptr, int maxoffset, int *offset, int inc) { short_ad *sa; if ( (!ptr) || (!offset) ) { printk(KERN_ERR "udf: udf_get_fileshortad() invalidparms\n"); return NULL; } if ( (*offset < 0) || ((*offset + sizeof(short_ad)) > maxoffset) ) return NULL; else if ((sa = (short_ad *)ptr)->extLength == 0) return NULL; if (inc) *offset += sizeof(short_ad); return sa; } long_ad * udf_get_filelongad(uint8_t *ptr, int maxoffset, int * offset, int inc) { long_ad *la; if ( (!ptr) || (!offset) ) { printk(KERN_ERR "udf: udf_get_filelongad() invalidparms\n"); return NULL; } if ( (*offset < 0) || ((*offset + sizeof(long_ad)) > maxoffset) ) return NULL; else if ((la = (long_ad *)ptr)->extLength == 0) return NULL; if (inc) *offset += sizeof(long_ad); return la; }