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package org.archive.format.arc;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.List;
import java.util.zip.Deflater;
import java.util.zip.GZIPInputStream;
import org.archive.format.ArchiveFileConstants;
import org.archive.util.zip.GzipHeader;
/**
* Constants used by ARC files and in ARC file processing.
*
* @author stack
*/
public interface ARCConstants extends ArchiveFileConstants {
public final static int MAX_META_LENGTH = 1024 * 32;
public final static Charset ARC_META_CHARSET = Charset.forName("utf-8");
public final static int NEW_LINE_ORD = 10;
public static final int CARRIAGE_RETURN_ORD = 13;
public final static String DELIMITER = " ";
public static final int FIELD_COUNT = 5;
public static final String URL_KEY = "Target-URI";
public static final String IP_KEY = "IP-Address";
public static final String DATE_STRING_KEY = "Date";
public static final String MIME_KEY = "Content-Type";
public static final String DECLARED_LENGTH_KEY = "Content-Length";
public static final String ACTUAL_LENGTH_KEY = "Actual-Length";
public static final String LEADING_NEWLINES_KEY = "Leading-Newlines";
public static final String TRAILING_NEWLINES_KEY = "Trailing-Newlines";
public static final String TRAILING_CRUFT_KEY = "Trailing-Slop";
public static final String HEADER_LENGTH = "Header-Length";
public static final String DEFAULT_MIME = "x-archive/unknown";
public static final String FILEDESC_SCHEME = "filedesc:/";
public static final String DNS_MIME = "text/dns";
public static final String ALEXA_DAT_MIME = "alexa/dat";
/**
* Default maximum ARC file size.
*/
public static final long DEFAULT_MAX_ARC_FILE_SIZE = 100000000;
/**
* Maximum length for a metadata line.
*/
public static final int MAX_METADATA_LINE_LENGTH = (4 * 1024);
/**
* ARC file extention.
*/
public static final String ARC_FILE_EXTENSION = "arc";
/**
* Dot ARC file extension.
*/
public static final String DOT_ARC_FILE_EXTENSION =
"." + ARC_FILE_EXTENSION;
public static final String DOT_COMPRESSED_FILE_EXTENSION =
ArchiveFileConstants.DOT_COMPRESSED_FILE_EXTENSION;
/**
* Compressed arc file extension.
*/
public static final String COMPRESSED_ARC_FILE_EXTENSION =
ARC_FILE_EXTENSION + DOT_COMPRESSED_FILE_EXTENSION;
/**
* Compressed dot arc file extension.
*/
public static final String DOT_COMPRESSED_ARC_FILE_EXTENSION =
DOT_ARC_FILE_EXTENSION + DOT_COMPRESSED_FILE_EXTENSION;
/**
* Encoding to use getting bytes from strings.
*
* Specify an encoding rather than leave it to chance: i.e whatever the
* JVMs encoding. Use an encoding that gets the stream as bytes, not chars.
*/
public static final String DEFAULT_ENCODING = "ISO-8859-1";
/**
* ARC file line seperator character.
*
* This is what the alexa c-code looks for delimiting lines.
*/
public static final char LINE_SEPARATOR = '\n';
/**
* ARC header field seperator character.
*/
public static final char HEADER_FIELD_SEPARATOR = ' ';
/**
* ARC file *MAGIC NUMBER*.
*
* Every ARC file must begin w/ this.
*/
public static final String ARC_MAGIC_NUMBER = "filedesc://";
/**
* The FLG.FEXTRA field that is added to ARC files. (See RFC1952 to
* understand FLG.FEXTRA).
*/
public static final byte[] ARC_GZIP_EXTRA_FIELD = { 8, 0, 'L', 'X', 4, 0,
0, 0, 0, 0 };
/**
* Key for the ARC Header IP field.
*
* Lowercased.
*/
public static final String IP_HEADER_FIELD_KEY = "ip-address";
/**
* Key for the ARC Header Result Code field.
*
* Lowercased.
*/
public static final String CODE_HEADER_FIELD_KEY = "result-code";
/**
* Key for the ARC Header Checksum field.
*
* Lowercased.
*/
public static final String CHECKSUM_HEADER_FIELD_KEY = "checksum";
/**
* Key for the ARC Header Location field.
*
* Lowercased.
*/
public static final String LOCATION_HEADER_FIELD_KEY = "location";
/**
* Key for the ARC Header Offset field.
*
* Lowercased.
*/
public static final String OFFSET_HEADER_FIELD_KEY = "offset";
/**
* Key for the ARC Header filename field.
*
* Lowercased.
*/
public static final String FILENAME_HEADER_FIELD_KEY = "filename";
/**
* Key for statuscode field.
*/
public static final String STATUSCODE_FIELD_KEY = "statuscode";
/**
* Key for offset field.
*/
public static final String OFFSET_FIELD_KEY = OFFSET_HEADER_FIELD_KEY;
/**
* Key for filename field.
*/
public static final String FILENAME_FIELD_KEY = FILENAME_HEADER_FIELD_KEY;
/**
* Key for checksum field.
*/
public static final String CHECKSUM_FIELD_KEY = CHECKSUM_HEADER_FIELD_KEY;
/**
* Tokenized field prefix.
*
* Use this prefix for tokenized fields when naming fields in
* an index.
*/
public static final String TOKENIZED_PREFIX = "tokenized_";
/**
* Assumed maximum size of a record meta header line.
*
* This 100k which seems massive but its the same as the LINE_LENGTH from
* alexa/include/a_arcio.h:
*
* #define LINE_LENGTH (100*1024)
*
*/
public static final int MAX_HEADER_LINE_LENGTH = 1024 * 100;
/**
* Version 1 required metadata fields.
*/
public static List REQUIRED_VERSION_1_HEADER_FIELDS = Arrays
.asList(new String[] { URL_FIELD_KEY, IP_HEADER_FIELD_KEY,
DATE_FIELD_KEY, MIMETYPE_FIELD_KEY,
LENGTH_FIELD_KEY, VERSION_FIELD_KEY,
ORIGIN_FIELD_KEY, ABSOLUTE_OFFSET_KEY });
/**
* Minimum possible record length.
*
* This is a rough calc. When the header is data it will occupy less space.
*/
public static int MINIMUM_RECORD_LENGTH = 1 + "://".length() + 1
+ ARC_FILE_EXTENSION.length() + " ".length() + +1 + " ".length()
+ 1 + " ".length() + 1 + "/".length() + 1 + " ".length() + 1;
/**
* Start of a GZIP header that uses default deflater.
*/
public static final byte[] GZIP_HEADER_BEGIN = {
(byte) GZIPInputStream.GZIP_MAGIC, // Magic number (short)
(byte) (GZIPInputStream.GZIP_MAGIC >> 8), // Magic number (short)
Deflater.DEFLATED // Compression method (CM)
};
/**
* Length of minimual 'default GZIP header.
*
* See RFC1952 for explaination of value of 10.
*/
public static final int DEFAULT_GZIP_HEADER_LENGTH =
GzipHeader.MINIMAL_GZIP_HEADER_LENGTH;
/**
* set of known errors encountered reading ARCs
*/
public enum ArcRecordErrors {
HTTP_HEADER_TRUNCATED,
HTTP_STATUS_LINE_INVALID,
HTTP_STATUS_LINE_EXCEPTION,
}
}
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