EMILE/libiso9660/iso9660_read.c

/*
 *
 * (c) 2005 Laurent Vivier <LaurentVivier@wanadoo.fr>
 *
 */

#include <string.h>
#include <stdio.h>

#include "libiso9660.h"

ssize_t iso9660_read(iso9660_FILE *file, void *buf, size_t count)
{
	size_t read = 0;

	while (count > 0)
	{
		size_t part;

		if (file->index == 2048)
		{
			if (file->len <= 0)
				return read;
			iso9660_device_read(file->extent, 
					    file->buffer, 
					    sizeof (file->buffer));
			file->len -= sizeof (file->buffer);
			file->extent++;
			file->index = 0;
		}

		if (count > sizeof(file->buffer) - file->index)
			part = sizeof(file->buffer) - file->index;
		else
			part = count;

		memcpy(buf + read, file->buffer + file->index, part);

		count -= part;
		file->index += part;
		read += part;
	}

	return read;
}