mirror of https://github.com/pbatard/rufus.git
329 lines
11 KiB
C
329 lines
11 KiB
C
/*
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Copyright (C) 2005, 2008, 2011 Rocky Bernstein <rocky@gnu.org>
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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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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/** \file read.h
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*
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* \brief sector (block, frame)-related libcdio routines.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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# define __CDIO_CONFIG_H__ 1
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#endif
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#include <cdio/cdio.h>
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#include <cdio/logging.h>
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#include "cdio_private.h"
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#include "cdio_assert.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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#define check_read_parms(p_cdio, p_buf, i_lsn) \
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if (!p_cdio) return DRIVER_OP_UNINIT; \
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if (!p_buf || CDIO_INVALID_LSN == i_lsn) \
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return DRIVER_OP_ERROR;
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#define check_lsn(i_lsn) \
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check_read_parms(p_cdio, p_buf, i_lsn); \
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{ \
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lsn_t end_lsn = \
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cdio_get_track_lsn(p_cdio, CDIO_CDROM_LEADOUT_TRACK); \
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if ( i_lsn > end_lsn ) { \
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cdio_info("Trying to access past end of disk lsn: %ld, end lsn: %ld", \
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(long int) i_lsn, (long int) end_lsn); \
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return DRIVER_OP_ERROR; \
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} \
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}
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#define check_lsn_blocks(i_lsn, i_blocks) \
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check_read_parms(p_cdio, p_buf, i_lsn); \
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{ \
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lsn_t end_lsn = \
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cdio_get_track_lsn(p_cdio, CDIO_CDROM_LEADOUT_TRACK); \
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if ( i_lsn > end_lsn ) { \
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cdio_info("Trying to access past end of disk lsn: %ld, end lsn: %ld", \
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(long int) i_lsn, (long int) end_lsn); \
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return DRIVER_OP_ERROR; \
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} \
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/* Care is used in the expression below to be correct with */ \
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/* respect to unsigned integers. */ \
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if ( i_lsn + i_blocks > end_lsn + 1 ) { \
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cdio_info("Request truncated to end disk; lsn: %ld, end lsn: %ld", \
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(long int) i_lsn, (long int) end_lsn); \
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i_blocks = end_lsn - i_lsn + 1; \
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} \
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}
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/*!
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lseek - reposition read/write file offset
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Returns (off_t) -1 on error.
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Similar to (if not the same as) libc's lseek()
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*/
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off_t
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cdio_lseek (const CdIo_t *p_cdio, off_t offset, int whence)
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{
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if (!p_cdio) return DRIVER_OP_UNINIT;
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if (p_cdio->op.lseek)
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return (p_cdio->op.lseek) (p_cdio->env, offset, whence);
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return DRIVER_OP_UNSUPPORTED;
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}
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/*! Reads into buf the next size bytes. Similar to (if not the
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same as) libc's read(). This is a "cooked" read, or one handled by
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the OS. It probably won't work on audio data. For that use
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cdio_read_audio_sector(s).
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@param p_cdio object to read from
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@param p_buf place to read data into. The caller should make sure
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this location can store at least i_size bytes.
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@param i_size number of bytes to read
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@return (ssize_t) -1 on error.
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*/
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ssize_t
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cdio_read (const CdIo_t *p_cdio, void *p_buf, size_t i_size)
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{
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if (!p_cdio) return DRIVER_OP_UNINIT;
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if (p_cdio->op.read)
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return (p_cdio->op.read) (p_cdio->env, p_buf, i_size);
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return DRIVER_OP_UNSUPPORTED;
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}
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/*!
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Reads an audio sector from cd device into data starting
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from lsn. Returns DRIVER_OP_SUCCESS if no error.
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*/
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driver_return_code_t
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cdio_read_audio_sector (const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn)
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{
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check_lsn(i_lsn);
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if (p_cdio->op.read_audio_sectors)
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return p_cdio->op.read_audio_sectors (p_cdio->env, p_buf, i_lsn, 1);
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return DRIVER_OP_UNSUPPORTED;
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}
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/*!
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Reads audio sectors from cd device into data starting
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from lsn. Returns DRIVER_OP_SUCCESS if no error.
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*/
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driver_return_code_t
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cdio_read_audio_sectors (const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn,
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uint32_t i_blocks)
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{
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check_lsn_blocks(i_lsn, i_blocks);
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if (0 == i_blocks) return DRIVER_OP_SUCCESS;
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if (p_cdio->op.read_audio_sectors)
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return (p_cdio->op.read_audio_sectors) (p_cdio->env, p_buf, i_lsn,
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i_blocks);
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return DRIVER_OP_UNSUPPORTED;
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}
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/*!
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Reads an audio sector from cd device into data starting
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from lsn. Returns DRIVER_OP_SUCCESS if no error.
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*/
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driver_return_code_t
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cdio_read_data_sectors (const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn,
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uint16_t i_blocksize, uint32_t i_blocks)
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{
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check_lsn(i_lsn);
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if (0 == i_blocks) return DRIVER_OP_SUCCESS;
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if (p_cdio->op.read_data_sectors)
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return p_cdio->op.read_data_sectors (p_cdio->env, p_buf, i_lsn,
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i_blocksize, i_blocks);
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return DRIVER_OP_UNSUPPORTED;
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}
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#ifndef SEEK_SET
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#define SEEK_SET 0
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#endif
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/*!
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Reads a single mode1 form1 or form2 sector from cd device
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into data starting from lsn. Returns DRIVER_OP_SUCCESS if no error.
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*/
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driver_return_code_t
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cdio_read_mode1_sector (const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn,
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bool b_form2)
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{
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uint32_t size = b_form2 ? M2RAW_SECTOR_SIZE : CDIO_CD_FRAMESIZE ;
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check_lsn(i_lsn);
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if (p_cdio->op.read_mode1_sector) {
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return p_cdio->op.read_mode1_sector(p_cdio->env, p_buf, i_lsn, b_form2);
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} else if (p_cdio->op.lseek && p_cdio->op.read) {
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char buf[M2RAW_SECTOR_SIZE] = { 0, };
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if (0 > cdio_lseek(p_cdio, CDIO_CD_FRAMESIZE*i_lsn, SEEK_SET))
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return -1;
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if (0 > cdio_read(p_cdio, buf, CDIO_CD_FRAMESIZE))
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return -1;
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memcpy (p_buf, buf, size);
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return DRIVER_OP_SUCCESS;
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}
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return DRIVER_OP_UNSUPPORTED;
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}
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/*!
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Reads mode 1 sectors
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@param p_cdio object to read from
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@param buf place to read data into
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@param lsn sector to read
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@param b_form2 true for reading mode 1 form 2 sectors or false for
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mode 1 form 1 sectors.
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@param i_blocks number of sectors to read
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*/
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driver_return_code_t
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cdio_read_mode1_sectors (const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn,
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bool b_form2, uint32_t i_blocks)
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{
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check_lsn_blocks(i_lsn, i_blocks);
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if (0 == i_blocks) return DRIVER_OP_SUCCESS;
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if (p_cdio->op.read_mode1_sectors)
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return (p_cdio->op.read_mode1_sectors) (p_cdio->env, p_buf, i_lsn, b_form2,
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i_blocks);
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return DRIVER_OP_UNSUPPORTED;
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}
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/*!
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Reads a mode 2 sector
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@param p_cdio object to read from
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@param buf place to read data into
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@param lsn sector to read
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@param b_form2 true for reading mode 2 form 2 sectors or false for
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mode 2 form 1 sectors.
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*/
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driver_return_code_t
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cdio_read_mode2_sector (const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn,
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bool b_form2)
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{
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check_lsn(i_lsn);
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if (p_cdio->op.read_mode2_sector)
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return p_cdio->op.read_mode2_sector (p_cdio->env, p_buf, i_lsn, b_form2);
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/* fallback */
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if (p_cdio->op.read_mode2_sectors != NULL)
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return cdio_read_mode2_sectors (p_cdio, p_buf, i_lsn, b_form2, 1);
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return DRIVER_OP_UNSUPPORTED;
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}
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/*!
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Reads mode 2 sectors
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@param p_cdio object to read from
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@param buf place to read data into
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@param lsn sector to read
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@param b_form2 true for reading mode2 form 2 sectors or false for
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mode 2 form 1 sectors.
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@param i_blocks number of sectors to read
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*/
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driver_return_code_t
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cdio_read_mode2_sectors (const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn,
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bool b_form2, uint32_t i_blocks)
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{
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check_lsn_blocks(i_lsn, i_blocks);
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if (0 == i_blocks) return DRIVER_OP_SUCCESS;
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if (p_cdio->op.read_mode2_sectors)
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return (p_cdio->op.read_mode2_sectors) (p_cdio->env, p_buf, i_lsn,
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b_form2, i_blocks);
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return DRIVER_OP_UNSUPPORTED;
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}
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/** The special case of reading a single block is a common one so we
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provide a routine for that as a convenience.
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*/
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driver_return_code_t
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cdio_read_sector(const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn,
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cdio_read_mode_t read_mode)
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{
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return cdio_read_sectors(p_cdio, p_buf, i_lsn, read_mode, 1);
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}
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/*!
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Reads a number of sectors (AKA blocks).
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@param p_buf place to read data into. The caller should make sure
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this location is large enough. See below for size information.
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@param read_mode the kind of "mode" to use in reading.
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@param i_lsn sector to read
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@param i_blocks number of sectors to read
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@return DRIVER_OP_SUCCESS (0) if no error, other (negative) enumerations
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are returned on error.
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If read_mode is CDIO_MODE_AUDIO,
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*p_buf should hold at least CDIO_FRAMESIZE_RAW * i_blocks bytes.
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If read_mode is CDIO_MODE_DATA,
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*p_buf should hold at least i_blocks times either ISO_BLOCKSIZE,
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M1RAW_SECTOR_SIZE or M2F2_SECTOR_SIZE depending on the kind of
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sector getting read. If you don't know whether you have a Mode 1/2,
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Form 1/ Form 2/Formless sector best to reserve space for the maximum
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which is M2RAW_SECTOR_SIZE.
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If read_mode is CDIO_MODE_M2F1,
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*p_buf should hold at least M2RAW_SECTOR_SIZE * i_blocks bytes.
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If read_mode is CDIO_MODE_M2F2,
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*p_buf should hold at least CDIO_CD_FRAMESIZE * i_blocks bytes.
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*/
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driver_return_code_t
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cdio_read_sectors(const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn,
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cdio_read_mode_t read_mode, uint32_t i_blocks)
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{
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switch(read_mode) {
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case CDIO_READ_MODE_AUDIO:
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return cdio_read_audio_sectors (p_cdio, p_buf, i_lsn, i_blocks);
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case CDIO_READ_MODE_M1F1:
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return cdio_read_mode1_sectors (p_cdio, p_buf, i_lsn, false, i_blocks);
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case CDIO_READ_MODE_M1F2:
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return cdio_read_mode1_sectors (p_cdio, p_buf, i_lsn, true, i_blocks);
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case CDIO_READ_MODE_M2F1:
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return cdio_read_mode2_sectors (p_cdio, p_buf, i_lsn, false, i_blocks);
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case CDIO_READ_MODE_M2F2:
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return cdio_read_mode2_sectors (p_cdio, p_buf, i_lsn, true, i_blocks);
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}
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/* Can't happen. Just to shut up gcc. */
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return DRIVER_OP_ERROR;
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}
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/*
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* Local variables:
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* c-file-style: "gnu"
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*/
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