makefs/cd9660/cd9660_write.c

/*	$NetBSD: cd9660_write.c,v 1.4 2005/10/30 07:40:45 dyoung Exp $	*/

/*
 * Copyright (c) 2005 Daniel Watt, Walter Deignan, Ryan Gabrys, Alan
 * Perez-Rathke and Ram Vedam.  All rights reserved.
 *
 * This code was written by Daniel Watt, Walter Deignan, Ryan Gabrys,
 * Alan Perez-Rathke and Ram Vedam.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials provided
 *    with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY DANIEL WATT, WALTER DEIGNAN, RYAN
 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL DANIEL WATT, WALTER DEIGNAN, RYAN
 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE,DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 */

#include "cd9660.h"
#include "iso9660_rrip.h"

#include <sys/cdefs.h>
#if defined(__RCSID) && !defined(__lint)
__RCSID("$NetBSD: cd9660_write.c,v 1.4 2005/10/30 07:40:45 dyoung Exp $");
#endif  /* !__lint */

static int cd9660_write_volume_descriptors(FILE *);
static int cd9660_write_path_table(FILE *, int, int);
static int cd9660_write_path_tables(FILE *);
static int cd9660_write_file(FILE *, cd9660node *);
static int cd9660_write_filedata(FILE *, int, const unsigned char *, int);
#if 0
static int cd9660_write_buffered(FILE *, int, int, const unsigned char*);
#endif
static int cd9660_write_rr(FILE *, cd9660node *, int, int);

/*
 * Write the image
 * Writes the entire image
 * @param const char* The filename for the image
 * @returns int 1 on success, 0 on failure
 */
int
cd9660_write_image(const char* image)
{
	FILE *fd;
	int status;
	char buf[2048];

	if ((fd = fopen(image, "w+")) == NULL) {
		err(EXIT_FAILURE, "%s: Can't open `%s' for writing", __func__,
		    image);
	}

	if (diskStructure.verbose_level > 0)
		printf("Writing image\n");

	/* Write the volume descriptors */
	status = cd9660_write_volume_descriptors(fd);
	if (status == 0) {
		warnx("%s: Error writing volume descriptors to image",
		    __func__);
		goto cleanup_bad_image;
	}

	if (diskStructure.verbose_level > 0)
		printf("Volume descriptors written\n");

	/*
	 * Write the path tables: there are actually four, but right
	 * now we are only concearned with two.
	 */
	status = cd9660_write_path_tables(fd);
	if (status == 0) {
		warnx("%s: Error writing path tables to image", __func__);
		goto cleanup_bad_image;
	}

	if (diskStructure.verbose_level > 0)
		printf("Path tables written\n");

	/* Write the directories and files */
	status = cd9660_write_file(fd, diskStructure.rootNode);
	if (status == 0) {
		warnx("%s: Error writing files to image", __func__);
		goto cleanup_bad_image;
	}

	if (diskStructure.is_bootable) {
		cd9660_write_boot(fd);
	}

	/* Write padding bits. This is temporary */
	memset(buf, 0, 2048);
	cd9660_write_filedata(fd, diskStructure.totalSectors - 1, buf, 1);

	if (diskStructure.verbose_level > 0)
		printf("Files written\n");
	fclose(fd);

	if (diskStructure.verbose_level > 0)
		printf("Image closed\n");
	return 1;

cleanup_bad_image:
	fclose(fd);
	if (!diskStructure.keep_bad_images)
		unlink(image);
	if (diskStructure.verbose_level > 0)
		printf("Bad image cleaned up\n");
	return 0;
}

static int
cd9660_write_volume_descriptors(FILE *fd)
{
	volume_descriptor *vd_temp = diskStructure.firstVolumeDescriptor;
	int pos;

	while (vd_temp != NULL) {
		pos = vd_temp->sector*diskStructure.sectorSize;
		cd9660_write_filedata(fd, vd_temp->sector,
		    vd_temp->volumeDescriptorData, 1);
		vd_temp = vd_temp->next;
	}
	return 1;
}

/*
 * Write out an individual path table
 * Used just to keep redundant code to a minimum
 * @param FILE *fd Valid file pointer
 * @param int Sector to start writing path table to
 * @param int Endian mode : BIG_ENDIAN or LITTLE_ENDIAN
 * @returns int 1 on success, 0 on failure
 */
static int
cd9660_write_path_table(FILE *fd, int sector, int mode)
{
	int path_table_sectors = CD9660_BLOCKS(diskStructure.sectorSize,
	    diskStructure.pathTableLength);
	unsigned char *buffer;
	unsigned char *buffer_head;
	int len;
	path_table_entry temp_entry;
	cd9660node *ptcur;

	buffer = malloc(diskStructure.sectorSize * path_table_sectors);
	if (buffer == NULL) {
		warnx("%s: Memory allocation error allocating buffer",
		    __func__);
		return 0;
	}
	buffer_head = buffer;
	memset(buffer, 0, diskStructure.sectorSize * path_table_sectors);

	ptcur = diskStructure.rootNode;

	while (ptcur != NULL) {
		memset(&temp_entry, 0, sizeof(path_table_entry));
		temp_entry.length[0] = ptcur->isoDirRecord->name_len[0];
		temp_entry.extended_attribute_length[0] =
		    ptcur->isoDirRecord->ext_attr_length[0];
		memcpy(temp_entry.name, ptcur->isoDirRecord->name,
		    temp_entry.length[0] + 1);

		/* round up */
		len = temp_entry.length[0] + 8 + (temp_entry.length[0] & 0x01);

                /* todo: function pointers instead */
		if (mode == LITTLE_ENDIAN) {
			cd9660_731(ptcur->fileDataSector,
			    temp_entry.first_sector);
			cd9660_721((ptcur->parent == NULL ?
				1 : ptcur->parent->ptnumber),
			    temp_entry.parent_number);
		} else {
			cd9660_732(ptcur->fileDataSector,
			    temp_entry.first_sector);
			cd9660_722((ptcur->parent == NULL ?
				1 : ptcur->parent->ptnumber),
			    temp_entry.parent_number);
		}


		memcpy(buffer, &temp_entry, len);
		buffer += len;

		ptcur = ptcur->ptnext;
	}

	return cd9660_write_filedata(fd, sector, buffer_head,
	    path_table_sectors);
}


/*
 * Write out the path tables to disk
 * Each file descriptor should be pointed to by the PVD, so we know which
 * sector to copy them to. One thing to watch out for: the only path tables
 * stored are in the endian mode that the application is compiled for. So,
 * the first thing to do is write out that path table, then to write the one
 * in the other endian mode requires to convert the endianness of each entry
 * in the table. The best way to do this would be to create a temporary
 * path_table_entry structure, then for each path table entry, copy it to
 * the temporary entry, translate, then copy that to disk.
 *
 * @param FILE* Valid file descriptor
 * @returns int 0 on failure, 1 on success
 */
static int
cd9660_write_path_tables(FILE *fd)
{
	if (cd9660_write_path_table(fd,
	    diskStructure.primaryLittleEndianTableSector, LITTLE_ENDIAN) == 0)
		return 0;

	if (cd9660_write_path_table(fd,
	    diskStructure.primaryBigEndianTableSector, BIG_ENDIAN) == 0)
		return 0;

	/* @TODO: handle remaining two path tables */
	return 1;
}

/*
 * Write a file to disk
 * Writes a file, its directory record, and its data to disk
 * This file is designed to be called RECURSIVELY, so initially call it
 * with the root node. All of the records should store what sector the
 * file goes in, so no computation should be  necessary.
 *
 * @param int fd Valid file descriptor
 * @param struct cd9660node* writenode Pointer to the file to be written
 * @returns int 0 on failure, 1 on success
 */
static int
cd9660_write_file(FILE *fd, cd9660node *writenode)
{
	char *buf;
	char *temp_file_name;
	int ret;
	int working_sector;
	int cur_sector_offset;
	int written;
	iso_directory_record_cd9660 temp_record;
	cd9660node *temp;
	int ca = 0;

	/* Todo : clean up variables */

	temp_file_name = malloc(CD9660MAXPATH + 1);
	if (temp_file_name == NULL)
		err(EXIT_FAILURE, "%s: malloc", __func__);

	memset(temp_file_name, 0, CD9660MAXPATH + 1);

	buf = malloc(diskStructure.sectorSize);
	if (buf == NULL)
		err(EXIT_FAILURE, "%s: malloc", __func__);

	if ((writenode->level != 0) &&
	    !(writenode->node->type & S_IFDIR)) {
		/* Only attempt to write files that have length */
		if (writenode->fileDataLength > 0) {
			cd9660_compute_full_filename(writenode,
			    temp_file_name, 0);
			ret = cd9660_copy_file(fd, writenode->fileDataSector,
			    temp_file_name);
			if (ret == 0) {
				free(temp_file_name);
				return 0;
			}
		}
	} else {
		/*
		 * Here is a new revelation that ECMA didnt explain
		 * (at least not well).
		 * ALL . and .. records store the name "\0" and "\1"
		 * resepctively. So, for each directory, we have to
		 * make a new node.
		 *
		 * This is where it gets kinda messy, since we have to
		 * be careful of sector boundaries
		 */
		cur_sector_offset = 0;
		working_sector = writenode->fileDataSector;
		fseek(fd, working_sector * diskStructure.sectorSize, SEEK_SET);

		/*
		 * Now loop over children, writing out their directory
		 * records - beware of sector boundaries
	 	 */
		TAILQ_FOREACH(temp, &writenode->cn_children, cn_next_child) {
			/*
			 * Copy the temporary record and adjust its size
			 * if necessary
			 */
			memcpy(&temp_record, temp->isoDirRecord,
			    sizeof(iso_directory_record_cd9660));

			temp_record.length[0] =
			    cd9660_compute_record_size(temp);

			if (temp_record.length[0] + cur_sector_offset >=
			    diskStructure.sectorSize) {
				cur_sector_offset = 0;
				working_sector++;

				/* Seek to the next sector. */
				fseek(fd,
				    working_sector * diskStructure.sectorSize,
				    SEEK_SET);
			}

			written = fwrite(&temp_record, 1, temp_record.length[0],
			    fd);
			ca = 0;
			if (diskStructure.rock_ridge_enabled) {
				ca = cd9660_write_rr(fd, temp,
				    cur_sector_offset, working_sector);
			}

			if (ferror(fd)) {
				warnx("%s: write error", __func__);
				free(temp_file_name);
				return 0;
			}
			cur_sector_offset += temp_record.length[0];

			/*
			 * If we had to go the the continuation area,
			 * head back to where we should be.
			 */
			if (ca) {
				fseek(fd,
				    working_sector * diskStructure.sectorSize +
					cur_sector_offset,
				    SEEK_SET);
			}
		}

		/*
		 * Recurse on children.
		 */
		TAILQ_FOREACH(temp, &writenode->cn_children, cn_next_child) {
			if ((ret = cd9660_write_file(fd, temp)) == 0) {
				free(temp_file_name);
				return 0;
			}
		}
	}
	free(temp_file_name);
	return 1;
}

/*
 * Wrapper function to write a buffer (one sector) to disk.
 * Seeks and writes the buffer.
 * NOTE: You dont NEED to use this function, but it might make your
 * life easier if you have to write things that align to a sector
 * (such as volume descriptors).
 *
 * @param int fd Valid file descriptor
 * @param int sector Sector number to write to
 * @param const unsigned char* Buffer to write. This should be the
 *                             size of a sector, and if only a portion
 *                             is written, the rest should be set to 0.
 */
static int
cd9660_write_filedata(FILE *fd, int sector, const unsigned char *buf,
		      int numsecs)
{
	off_t curpos;
	size_t success;

	curpos = ftello(fd);

	fseek(fd, sector * diskStructure.sectorSize, SEEK_SET);

	success = fwrite(buf, diskStructure.sectorSize * numsecs, 1, fd);

	fseek(fd, curpos, SEEK_SET);

	if (success == 1)
		success = diskStructure.sectorSize * numsecs;
	return success;
}

#if 0
static int
cd9660_write_buffered(FILE *fd, int offset, int buff_len,
		      const unsigned char* buffer)
{
	static int working_sector = -1;
	static char buf[2048];

	return 0;
}
#endif

int
cd9660_copy_file(FILE *fd, int start_sector, const char *filename)
{
	FILE *rf;
	int bytes_read;
	int sector = start_sector;
	int buf_size = diskStructure.sectorSize;
	char *buf;

	buf = malloc(buf_size);
	if (buf == NULL)
		err(EXIT_FAILURE, "%s: malloc", __func__);

	if ((rf = fopen(filename, "rb")) == NULL) {
		warn("%s: cannot open %s", __func__, filename);
		return 0;
	}

	if (diskStructure.verbose_level > 1)
		printf("Writing file: %s\n",filename);

	fseek(fd, start_sector * diskStructure.sectorSize, SEEK_SET);

	while (!feof(rf)) {
		bytes_read = fread(buf,1,buf_size,rf);
		if (ferror(rf)) {
			warn("%s: fread", __func__);
			return 0;
		}

		fwrite(buf,1,bytes_read,fd);
		if (ferror(fd)) {
			warn("%s: fwrite", __func__);
			return 0;
		}
		sector++;
	}

	fclose(rf);
	free(buf);
	return 1;
}

static int
cd9660_write_rr(FILE *fd, cd9660node *writenode, int offset, int sector)
{
	int in_ca = 0;
	struct ISO_SUSP_ATTRIBUTES *myattr;

	offset += writenode->isoDirRecord->length[0];

	/* Offset now points at the end of the record */
	TAILQ_FOREACH(myattr, &writenode->head, rr_ll) {
		fseek(fd,
		    in_ca ? offset : sector*diskStructure.sectorSize + offset,
		    SEEK_SET);
		fwrite(&(myattr->attr), CD9660_SUSP_ENTRY_SIZE(myattr), 1, fd);

		offset += CD9660_SUSP_ENTRY_SIZE(myattr);
		if (!in_ca) {
			if ((myattr->susp_type == SUSP_TYPE_SUSP) &&
			    (myattr->entry_type == SUSP_ENTRY_SUSP_CE)) {
				/*
				 * Point the offset to the start of this
				 * record's CE area
				 */
				offset = (diskStructure.
					  susp_continuation_area_start_sector *
					    diskStructure.sectorSize)
					+ writenode->susp_entry_ce_start;
				in_ca = 1;
			}
		}
	}

	return in_ca;
}