151 lines
4.3 KiB
C
151 lines
4.3 KiB
C
/*
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$Id: udf_file.c,v 1.10 2006/04/15 03:05:14 rocky Exp $
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Copyright (C) 2005, 2006 Rocky Bernstein <rockyb@users.sourceforge.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* Access routines */
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#include <cdio/bytesex.h>
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#include "udf_private.h"
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#include "udf_fs.h"
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#include <stdio.h> /* Remove when adding cdio/logging.h */
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#define MIN(a, b) (a>b) ? (a) : (b)
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const char *
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udf_get_filename(const udf_dirent_t *p_udf_dirent)
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{
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if (!p_udf_dirent) return NULL;
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if (!p_udf_dirent->psz_name) return "..";
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return p_udf_dirent->psz_name;
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}
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bool
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udf_get_file_entry(const udf_dirent_t *p_udf_dirent,
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/*out*/ udf_file_entry_t *p_udf_fe)
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{
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if (!p_udf_dirent) return false;
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memcpy(p_udf_fe, &p_udf_dirent->fe, sizeof(udf_file_entry_t));
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return true;
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}
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/*!
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Return the file id descriptor of the given file.
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*/
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bool udf_get_fileid_descriptor(const udf_dirent_t *p_udf_dirent,
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/*out*/ udf_fileid_desc_t *p_udf_fid)
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{
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if (!p_udf_dirent) return false;
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if (!p_udf_dirent->fid) {
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/* FIXME do something about trying to get the descriptor. */
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return false;
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}
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memcpy(p_udf_fid, p_udf_dirent->fid, sizeof(udf_fileid_desc_t));
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return true;
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}
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/*!
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Return the number of hard links of the file. Return 0 if error.
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*/
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uint16_t udf_get_link_count(const udf_dirent_t *p_udf_dirent)
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{
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if (p_udf_dirent) {
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return uint16_from_le(p_udf_dirent->fe.link_count);
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}
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return 0; /* Error. Non-error case handled above. */
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}
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/*!
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Return the file length the file. Return 2147483647L if error.
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*/
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uint64_t udf_get_file_length(const udf_dirent_t *p_udf_dirent)
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{
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if (p_udf_dirent) {
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return uint64_from_le(p_udf_dirent->fe.info_len);
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}
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return 2147483647L; /* Error. Non-error case handled above. */
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}
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/*!
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Return true if the file is a directory.
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*/
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bool
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udf_is_dir(const udf_dirent_t *p_udf_dirent)
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{
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return p_udf_dirent->b_dir;
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}
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/**
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Attempts to read up to count bytes from UDF directory entry
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p_udf_dirent into the buffer starting at buf. buf should be a
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multiple of UDF_BLOCKSIZE bytes. Reading continues after the point
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at which we last read or from the beginning the first time.
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If count is zero, read() returns zero and has no other results. If
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count is greater than SSIZE_MAX, the result is unspecified.
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If there is an error, cast the result to driver_return_code_t for
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the specific error code.
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*/
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ssize_t
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udf_read_block(const udf_dirent_t *p_udf_dirent, void * buf, size_t count)
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{
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if (count == 0) return 0;
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else {
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udf_t *p_udf = p_udf_dirent->p_udf;
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uint8_t data[UDF_BLOCKSIZE];
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const udf_file_entry_t *p_udf_fe = (udf_file_entry_t *) data;
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driver_return_code_t ret;
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const unsigned long int i_file_length = udf_get_file_length(p_udf_dirent);
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ret = udf_read_sectors(p_udf, data, p_udf_dirent->fe.unique_ID, 1);
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if (ret == DRIVER_OP_SUCCESS) {
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if (!udf_checktag(&p_udf_fe->tag, TAGID_FILE_ENTRY)) {
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uint32_t i_lba_start, i_lba_end;
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udf_get_lba( p_udf_fe, &i_lba_start, &i_lba_end);
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/* set i_lba_start to position of where we last left off. */
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i_lba_start += (p_udf->i_position / UDF_BLOCKSIZE);
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if ( (i_lba_end - i_lba_start+1) < count ) {
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printf("Warning: don't know how to handle yet\n" );
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count = i_lba_end - i_lba_start+1;
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} else {
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const uint32_t i_lba = p_udf->i_part_start+i_lba_start;
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ret = udf_read_sectors(p_udf, buf, i_lba, count);
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if (DRIVER_OP_SUCCESS == ret) {
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ssize_t i_read_len = MIN(i_file_length, count * UDF_BLOCKSIZE);
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p_udf->i_position += i_read_len;
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return i_read_len;
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}
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}
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} else {
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return DRIVER_OP_ERROR;
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}
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}
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return ret;
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}
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}
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