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A Java library for parsing and generating Internet mail messages.
The newest version!
package com.upokecenter.mail;
/*
Written by Peter O. in 2014.
Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/
If you like this, you should donate to Peter O.
at: http://upokecenter.dreamhosters.com/articles/donate-now-2/
*/
import java.io.*;
import com.upokecenter.util.*;
import com.upokecenter.text.*;
/**
* Encodes binary data into Quoted Printable.
*/
final class QuotedPrintableEncoder implements ICharacterEncoder {
private static final String HexAlphabet = "0123456789ABCDEF";
private int lineCount;
private final int lineBreakMode;
private final boolean unlimitedLineLength;
// lineBreakMode:
// 0 - no line breaks
// 1 - treat CRLF as a line break
// 2 - treat CR, LF, and CRLF as a line break
public QuotedPrintableEncoder (int lineBreakMode, boolean unlimitedLineLength) {
this.lineBreakMode = lineBreakMode;
this.unlimitedLineLength = unlimitedLineLength;
}
private int IncrementAndAppend(IWriter output, String appendStr) {
int count = 0;
if (!this.unlimitedLineLength) {
if (this.lineCount + appendStr.length() > 75) {
// 76 including the final '='
output.write(0x3d);
output.write(0x0d);
output.write(0x0a);
this.lineCount = appendStr.length();
count += 3;
} else {
this.lineCount += appendStr.length();
}
}
for (int i = 0; i < appendStr.length(); ++i) {
output.write((byte)appendStr.charAt(i));
++count;
}
return count;
}
private int IncrementAndAppendChars(
IWriter output,
char b1,
char b2,
char b3) {
int count = 0;
if (!this.unlimitedLineLength) {
if (this.lineCount + 3 > 75) {
// 76 including the final '='
output.write(0x3d);
output.write(0x0d);
output.write(0x0a);
this.lineCount = 3;
count += 3;
} else {
this.lineCount += 3;
}
}
output.write((byte)b1);
output.write((byte)b2);
output.write((byte)b3);
count += 3;
return count;
}
private int IncrementAndAppendChar(IWriter output, char ch) {
if (!this.unlimitedLineLength) {
if (this.lineCount + 1 > 75) {
// 76 including the final '='
byte[] buf = new byte[] { 0x3d, 0x0d, 0x0a, (byte)ch };
output.write(buf, 0, buf.length);
this.lineCount = 1;
return 4;
} else {
++this.lineCount;
}
}
output.write((byte)ch);
return 1;
}
private int machineState;
public int Encode(
int c,
IWriter output) {
if (output == null) {
throw new NullPointerException("output");
}
int count = 0;
if (c >= 0) {
c &= 0xff;
}
while (true) {
switch (this.machineState) {
case 0: {
// Normal
if (c < 0) {
return -1;
}
if (c == 0xd) {
if (this.lineBreakMode == 0) {
return count + this.IncrementAndAppend(output, "=0D");
} else {
this.machineState = 1;
return count;
}
} else if (c == 0xa) {
if (this.lineBreakMode == 2) {
output.write((byte)0x0d);
output.write((byte)0x0a);
this.lineCount = 0;
return 2 + count;
} else {
return count + this.IncrementAndAppend(output, "=0A");
}
} else if (c == 0x09) {
return count + this.IncrementAndAppend(output, "=09");
} else if (c == 0x3d) {
return count + this.IncrementAndAppend(output, "=3D");
} else if (c == 0x2e && this.lineCount == 0) {
this.machineState = 2;
return count;
} else if (c == 0x46 && this.lineCount == 0) {
this.machineState = 3;
return count;
} else if (c == 0x09) {
this.machineState = 7;
return count;
} else if ((c >= 'A' && c <= 'Z') ||
(c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') ||
"()'+-.,/?:".indexOf((char)c) >= 0) {
return count + this.IncrementAndAppendChar(output, (char)c);
} else {
count += this.IncrementAndAppendChars(
output,
(char)0x3d,
HexAlphabet.charAt((c >> 4) & 15),
HexAlphabet.charAt(c & 15));
return count;
}
}
case 1: {
// Carriage return
if (c == 0x0a) {
output.write((byte)0x0d);
output.write((byte)0x0a);
this.lineCount = 0;
count += 2;
this.machineState = 0;
return count;
} else {
if (this.lineBreakMode == 2) {
output.write((byte)0x0d);
output.write((byte)0x0a);
this.lineCount = 0;
this.machineState = 0;
count += 2;
continue;
} else {
count += this.IncrementAndAppend(output, "=0D");
this.machineState = 0;
continue;
}
}
}
case 2: {
// Dot at beginning of line
if (c == 0x0d || c == 0x0a) {
count += this.IncrementAndAppend(output, "=2E");
} else {
count += this.IncrementAndAppendChar(output, (char)0x2e);
}
this.machineState = 0;
continue;
}
case 3: {
// Capital F at beginning of line
// See page 7-8 of RFC 2049
if (c == (byte)'r') {
this.machineState = 4;
return count;
} else {
count += this.IncrementAndAppendChar(output, (char)'F');
this.machineState = 0;
continue;
}
}
case 4: {
// 'Fr' at beginning of line
if (c == (byte)'o') {
this.machineState = 5;
return count;
} else {
count += this.IncrementAndAppendChar(output, (char)'F');
count += this.IncrementAndAppendChar(output, (char)'r');
this.machineState = 0;
continue;
}
}
case 5: {
// 'Fro' at beginning of line
if (c == (byte)'m') {
this.machineState = 6;
return count;
} else {
count += this.IncrementAndAppendChar(output, (char)'F');
count += this.IncrementAndAppendChar(output, (char)'r');
count += this.IncrementAndAppendChar(output, (char)'o');
this.machineState = 0;
continue;
}
}
case 6: {
// 'From' at beginning of line
if (c == 0x20) {
count += this.IncrementAndAppend(output, "=46");
count += this.IncrementAndAppendChar(output, (char)'r');
count += this.IncrementAndAppendChar(output, (char)'o');
count += this.IncrementAndAppendChar(output, (char)'m');
this.machineState = 0;
continue;
} else {
count += this.IncrementAndAppendChar(output, (char)'F');
count += this.IncrementAndAppendChar(output, (char)'r');
count += this.IncrementAndAppendChar(output, (char)'o');
count += this.IncrementAndAppendChar(output, (char)'m');
this.machineState = 0;
continue;
}
}
case 7: {
// Space
if (c < 0) {
count += this.IncrementAndAppend(output, "=20");
return count;
} else if (this.lineBreakMode == 2 && c == 0x0a) {
count += this.IncrementAndAppend(output, "=20\r\n");
this.lineCount = 0;
return count;
} else if (this.lineBreakMode == 2 && c == 0x0d) {
this.machineState = 8;
return count;
} else if (this.lineBreakMode == 2) {
count += this.IncrementAndAppendChar(output, ' ');
this.machineState = 0;
continue;
} else if (this.lineBreakMode == 1 && c == 0x0d) {
this.machineState = 8;
return count;
} else if (this.lineBreakMode == 1 && c == 0x0a) {
count += this.IncrementAndAppend(output, "=20");
this.machineState = 0;
continue;
} else {
count += this.IncrementAndAppendChar(output, ' ');
this.machineState = 0;
continue;
}
}
case 8: {
// Space, CR
if (c < 0) {
if (this.lineBreakMode == 2) {
// Space, linebreak, EOF
count += this.IncrementAndAppend(output, "=20\r\n");
this.machineState = 0;
return count;
} else if (this.lineBreakMode == 1) {
// Space, CR, EOF
count += this.IncrementAndAppend(output, "=20");
count += this.IncrementAndAppend(output, "=0D");
count += this.IncrementAndAppend(output, "\r\n");
this.machineState = 0;
return count;
} else {
// Space, CR, EOF
count += this.IncrementAndAppend(output, "=20");
count += this.IncrementAndAppend(output, "=0D");
count += this.IncrementAndAppend(output, "=0A");
this.machineState = 0;
return count;
}
} else if (c == 0x0a) {
if (this.lineBreakMode == 2 || this.lineBreakMode == 1) {
// Space, linebreak, EOF
count += this.IncrementAndAppend(output, "=20\r\n");
this.machineState = 0;
return count;
} else {
// Space, CR, EOF
count += this.IncrementAndAppend(output, "=20");
count += this.IncrementAndAppend(output, "=0D");
count += this.IncrementAndAppend(output, "=0A");
this.machineState = 0;
return count;
}
} else if (c == 0x0d) {
count += this.IncrementAndAppend(output, "=20");
this.machineState = 0;
continue;
} else {
count += this.IncrementAndAppendChar(output, ' ');
this.machineState = 0;
continue;
}
}
}
}
}
}
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