Issue #1258 - Part 1: Import mailnews, ldap, and mork from comm-esr52.9.1

1 files changed, 1107 insertions, 0 deletions

diff --git a/mailnews/mime/src/mimeenc.cpp b/mailnews/mime/src/mimeenc.cpp
new file mode 100644
index 0000000000..d565a6067c
--- /dev/null
+++ b/mailnews/mime/src/mimeenc.cpp
@@ -0,0 +1,1107 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include <stdio.h>
+#include "mimei.h"
+#include "prmem.h"
+#include "mimeobj.h"
+#include "mozilla/RangedPtr.h"
+#include "mozilla/mailnews/MimeEncoder.h"
+
+typedef enum mime_encoding {
+  mime_Base64, mime_QuotedPrintable, mime_uuencode, mime_yencode
+} mime_encoding;
+
+typedef enum mime_decoder_state {
+  DS_BEGIN, DS_BODY, DS_END
+} mime_decoder_state;
+
+struct MimeDecoderData {
+  mime_encoding encoding;    /* Which encoding to use */
+
+  /* A read-buffer used for QP and B64. */
+  char token[4];
+  int token_size;
+
+  /* State and read-buffer used for uudecode and yencode. */
+  mime_decoder_state ds_state;
+  char *line_buffer;
+  int line_buffer_size;
+
+  MimeObject *objectToDecode; // might be null, only used for QP currently
+  /* Where to write the decoded data */
+  MimeConverterOutputCallback write_buffer;
+  void *closure;
+};
+
+
+static int
+mime_decode_qp_buffer (MimeDecoderData *data, const char *buffer,
+          int32_t length, int32_t *outSize)
+{
+  /* Warning, we are overwriting the buffer which was passed in.
+   This is ok, because decoding these formats will never result
+   in larger data than the input, only smaller. */
+  const char *in  = buffer;
+  char *out = (char *) buffer;
+  char token [3];
+  int i;
+
+  NS_ASSERTION(data->encoding == mime_QuotedPrintable, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+  if (data->encoding != mime_QuotedPrintable) return -1;
+
+  /* For the first pass, initialize the token from the unread-buffer. */
+  i = 0;
+  while (i < 3 && data->token_size > 0)
+  {
+    token [i] = data->token[i];
+    data->token_size--;
+    i++;
+  }
+
+  /* #### BUG: when decoding quoted-printable, we are required to
+   strip trailing whitespace from lines -- since when encoding in
+   qp, one is required to quote such trailing whitespace, any
+   trailing whitespace which remains must have been introduced
+   by a stupid gateway. */
+
+  /* Treat null bytes as spaces when format_out is
+   nsMimeOutput::nsMimeMessageBodyDisplay (see bug 243199 comment 7) */
+  bool treatNullAsSpace = data->objectToDecode &&
+                            data->objectToDecode->options->format_out == nsMimeOutput::nsMimeMessageBodyDisplay;
+
+  while (length > 0 || i != 0)
+  {
+    while (i < 3 && length > 0)
+    {
+      token [i++] = *in;
+      in++;
+      length--;
+    }
+
+    if (i < 3)
+    {
+      /* Didn't get enough for a complete token.
+       If it might be a token, unread it.
+       Otherwise, just dump it.
+       */
+      memcpy (data->token, token, i);
+      data->token_size = i;
+      i = 0;
+      length = 0;
+      break;
+    }
+    i = 0;
+
+    if (token [0] == '=')
+    {
+      unsigned char c = 0;
+      if (token[1] >= '0' && token[1] <= '9')
+      c = token[1] - '0';
+      else if (token[1] >= 'A' && token[1] <= 'F')
+      c = token[1] - ('A' - 10);
+      else if (token[1] >= 'a' && token[1] <= 'f')
+      c = token[1] - ('a' - 10);
+      else if (token[1] == '\r' || token[1] == '\n')
+      {
+        /* =\n means ignore the newline. */
+        if (token[1] == '\r' && token[2] == '\n')
+        ;    /* swallow all three chars */
+        else
+        {
+          in--;  /* put the third char back */
+          length++;
+        }
+        continue;
+      }
+      else
+      {
+        /* = followed by something other than hex or newline -
+         pass it through unaltered, I guess.  (But, if
+         this bogus token happened to occur over a buffer
+         boundary, we can't do this, since we don't have
+         space for it.  Oh well.  Screw it.)  */
+        if (in > out) *out++ = token[0];
+        if (in > out) *out++ = token[1];
+        if (in > out) *out++ = token[2];
+        continue;
+      }
+
+      /* Second hex digit */
+      c = (c << 4);
+      if (token[2] >= '0' && token[2] <= '9')
+      c += token[2] - '0';
+      else if (token[2] >= 'A' && token[2] <= 'F')
+      c += token[2] - ('A' - 10);
+      else if (token[2] >= 'a' && token[2] <= 'f')
+      c += token[2] - ('a' - 10);
+      else
+      {
+        /* We got =xy where "x" was hex and "y" was not, so
+         treat that as a literal "=", x, and y.  (But, if
+         this bogus token happened to occur over a buffer
+         boundary, we can't do this, since we don't have
+         space for it.  Oh well.  Screw it.) */
+        if (in > out) *out++ = token[0];
+        if (in > out) *out++ = token[1];
+        if (in > out) *out++ = token[2];
+        continue;
+      }
+
+      *out++ = c ? (char) c : ((treatNullAsSpace) ? ' ' : (char) c);
+    }
+    else
+    {
+      *out++ = token[0];
+
+      token[0] = token[1];
+      token[1] = token[2];
+      i = 2;
+    }
+  }
+
+  // Fill the size
+  if (outSize)
+    *outSize = out - buffer;
+
+  /* Now that we've altered the data in place, write it. */
+  if (out > buffer)
+  return data->write_buffer (buffer, (out - buffer), data->closure);
+  else
+  return 1;
+}
+
+
+static int
+mime_decode_base64_token (const char *in, char *out)
+{
+  /* reads 4, writes 0-3.  Returns bytes written.
+   (Writes less than 3 only at EOF.) */
+  int j;
+  int eq_count = 0;
+  unsigned long num = 0;
+
+  for (j = 0; j < 4; j++)
+  {
+    unsigned char c = 0;
+    if (in[j] >= 'A' && in[j] <= 'Z')     c = in[j] - 'A';
+    else if (in[j] >= 'a' && in[j] <= 'z') c = in[j] - ('a' - 26);
+    else if (in[j] >= '0' && in[j] <= '9') c = in[j] - ('0' - 52);
+    else if (in[j] == '+')         c = 62;
+    else if (in[j] == '/')         c = 63;
+    else if (in[j] == '=')         c = 0, eq_count++;
+    else
+    NS_ERROR("Invalid character");
+    num = (num << 6) | c;
+  }
+
+  *out++ = (char) (num >> 16);
+  *out++ = (char) ((num >> 8) & 0xFF);
+  *out++ = (char) (num & 0xFF);
+
+  if (eq_count == 0)
+  return 3;        /* No "=" padding means 4 bytes mapped to 3. */
+  else if (eq_count == 1)
+  return 2;        /* "xxx=" means 3 bytes mapped to 2. */
+  else if (eq_count == 2)
+  return 1;        /* "xx==" means 2 bytes mapped to 1. */
+  else
+  {
+    // "x===" can't happen, because "x" would then be encoding only
+    // 6 bits, not the min of 8.
+    NS_ERROR("Count is 6 bits, should be at least 8");
+    return 1;
+  }
+}
+
+
+static int
+mime_decode_base64_buffer (MimeDecoderData *data,
+               const char *buffer, int32_t length, int32_t *outSize)
+{
+  /* Warning, we are overwriting the buffer which was passed in.
+   This is ok, because decoding these formats will never result
+   in larger data than the input, only smaller. */
+  const char *in  = buffer;
+  char *out = (char *) buffer;
+  char token [4];
+  int i;
+  bool leftover = (data->token_size > 0);
+
+  NS_ASSERTION(data->encoding == mime_Base64, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+
+  /* For the first pass, initialize the token from the unread-buffer. */
+  i = 0;
+  while (i < 4 && data->token_size > 0)
+  {
+    token [i] = data->token[i];
+    data->token_size--;
+    i++;
+  }
+
+  while (length > 0)
+  {
+    while (i < 4 && length > 0)
+    {
+      if ((*in >= 'A' && *in <= 'Z') ||
+        (*in >= 'a' && *in <= 'z') ||
+        (*in >= '0' && *in <= '9') ||
+        *in == '+' || *in == '/' || *in == '=')
+      token [i++] = *in;
+      in++;
+      length--;
+    }
+
+    if (i < 4)
+    {
+      /* Didn't get enough for a complete token. */
+      memcpy (data->token, token, i);
+      data->token_size = i;
+      length = 0;
+      break;
+    }
+    i = 0;
+
+    if (leftover)
+    {
+      /* If there are characters left over from the last time around,
+       we might not have space in the buffer to do our dirty work
+       (if there were 2 or 3 left over, then there is only room for
+       1 or 2 in the buffer right now, and we need 3.)  This is only
+       a problem for the first chunk in each buffer, so in that
+       case, just write prematurely. */
+      int n;
+      n = mime_decode_base64_token (token, token);
+      n = data->write_buffer (token, n, data->closure);
+      if (n < 0) /* abort */
+      return n;
+
+      /* increment buffer so that we don't write the 1 or 2 unused
+       characters now at the front. */
+      buffer = in;
+      out = (char *) buffer;
+
+      leftover = false;
+    }
+    else
+    {
+      int n = mime_decode_base64_token (token, out);
+      /* Advance "out" by the number of bytes just written to it. */
+      out += n;
+    }
+  }
+
+  if (outSize)
+    *outSize = out - buffer;
+  /* Now that we've altered the data in place, write it. */
+  if (out > buffer)
+  return data->write_buffer (buffer, (out - buffer), data->closure);
+  else
+  return 1;
+}
+
+
+static int
+mime_decode_uue_buffer (MimeDecoderData *data,
+            const char *input_buffer, int32_t input_length, int32_t *outSize)
+{
+  /* First, copy input_buffer into state->line_buffer until we have
+   a complete line.
+
+   Then decode that line in place (in the line_buffer) and write
+   it out.
+
+   Then pull the next line into line_buffer and continue.
+   */
+  if (!data->line_buffer)
+  {
+    data->line_buffer_size = 128;
+    data->line_buffer = (char *)PR_MALLOC(data->line_buffer_size);
+    if (!data->line_buffer)
+      return -1;
+    data->line_buffer[0] = 0;
+  }
+
+  int status = 0;
+  char *line = data->line_buffer;
+  char *line_end = data->line_buffer + data->line_buffer_size - 1;
+
+  NS_ASSERTION(data->encoding == mime_uuencode, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+  if (data->encoding != mime_uuencode) return -1;
+
+  if (data->ds_state == DS_END)
+  {
+    status = 0;
+    goto DONE;
+  }
+
+  while (input_length > 0)
+  {
+    /* Copy data from input_buffer to `line' until we have a complete line,
+     or until we've run out of input.
+
+     (line may have data in it already if the last time we were called,
+     we weren't called with a buffer that ended on a line boundary.)
+     */
+    {
+    char *out = line + strlen(line);
+    while (input_length > 0 &&
+         out < line_end)
+      {
+      *out++ = *input_buffer++;
+      input_length--;
+
+      if (out[-1] == '\r' || out[-1] == '\n')
+        {
+        /* If we just copied a CR, and an LF is waiting, grab it too.
+         */
+        if (out[-1] == '\r' &&
+          input_length > 0 &&
+          *input_buffer == '\n')
+          input_buffer++, input_length--;
+
+        /* We have a line. */
+        break;
+        }
+      }
+    *out = 0;
+
+    /* Ignore blank lines.
+     */
+    if (*line == '\r' || *line == '\n')
+      {
+      *line = 0;
+      continue;
+      }
+
+    /* If this line was bigger than our buffer, truncate it.
+       (This means the data was way corrupted, and there's basically
+       no chance of decoding it properly, but give it a shot anyway.)
+     */
+    if (out == line_end)
+      {
+      out--;
+      out[-1] = '\r';
+      out[0] = 0;
+      }
+
+    /* If we didn't get a complete line, simply return; we'll be called
+       with the rest of this line next time.
+     */
+    if (out[-1] != '\r' && out[-1] != '\n')
+      {
+      NS_ASSERTION (input_length == 0, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+      break;
+      }
+    }
+
+
+    /* Now we have a complete line.  Deal with it.
+     */
+
+
+    if (data->ds_state == DS_BODY &&
+      line[0] == 'e' &&
+      line[1] == 'n' &&
+      line[2] == 'd' &&
+      (line[3] == '\r' ||
+       line[3] == '\n'))
+    {
+      /* done! */
+      data->ds_state = DS_END;
+      *line = 0;
+      break;
+    }
+    else if (data->ds_state == DS_BEGIN)
+    {
+      if (!strncmp (line, "begin ", 6))
+      data->ds_state = DS_BODY;
+      *line = 0;
+      continue;
+    }
+    else
+    {
+      /* We're in DS_BODY.  Decode the line. */
+      char *in, *out;
+      int32_t i;
+      long lost;
+
+      NS_ASSERTION (data->ds_state == DS_BODY, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+
+      /* We map down `line', reading four bytes and writing three.
+       That means that `out' always stays safely behind `in'.
+       */
+      in = line;
+      out = line;
+
+# undef DEC
+# define DEC(c) (((c) - ' ') & 077)
+      i = DEC (*in); /* get length */
+
+      /* all the parens and casts are because gcc was doing something evil.
+       */
+      lost = ((long) i) - (((((long) strlen (in)) - 2L) * 3L) / 4L);
+
+      if (lost > 0) /* Short line!! */
+      {
+        /* If we get here, then the line is shorter than the length byte
+         at the beginning says it should be.  However, the case where
+         the line is short because it was at the end of the buffer and
+         we didn't get the whole line was handled earlier (up by the
+         "didn't get a complete line" comment.)  So if we've gotten
+         here, then this is a complete line which is internally
+         inconsistent.  We will parse from it what we can...
+
+         This probably happened because some gateway stripped trailing
+         whitespace from the end of the line -- so pretend the line
+         was padded with spaces (which map to \000.)
+         */
+        i -= lost;
+      }
+
+      for (++in; i > 0; in += 4, i -= 3)
+      {
+        char ch;
+        NS_ASSERTION(out <= in, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+
+        if (i >= 3)
+        {
+          /* We read four; write three. */
+          ch = DEC (in[0]) << 2 | DEC (in[1]) >> 4;
+          *out++ = ch;
+
+          NS_ASSERTION(out <= in+1, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+
+          ch = DEC (in[1]) << 4 | DEC (in[2]) >> 2;
+          *out++ = ch;
+
+          NS_ASSERTION(out <= in+2, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+
+          ch = DEC (in[2]) << 6 | DEC (in[3]);
+          *out++ = ch;
+
+          NS_ASSERTION(out <= in+3, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+        }
+        else
+        {
+          /* Handle a line that isn't a multiple of 4 long.
+           (We read 1, 2, or 3, and will write 1 or 2.)
+           */
+          NS_ASSERTION (i > 0 && i < 3, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+
+          ch = DEC (in[0]) << 2 | DEC (in[1]) >> 4;
+          *out++ = ch;
+
+          NS_ASSERTION(out <= in+1, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+
+          if (i == 2)
+          {
+            ch = DEC (in[1]) << 4 | DEC (in[2]) >> 2;
+            *out++ = ch;
+
+            NS_ASSERTION(out <= in+2, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+          }
+        }
+      }
+
+      /* If the line was truncated, pad the missing bytes with 0 (SPC). */
+      while (lost > 0)
+      {
+        *out++ = 0;
+        lost--;
+        in = out+1; /* just to prevent the assert, below. */
+      }
+# undef DEC
+
+      /* Now write out what we decoded for this line.
+       */
+      NS_ASSERTION(out >= line && out < in, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+      if (out > line)
+      status = data->write_buffer (line, (out - line), data->closure);
+
+      // The assertion above tells us this is >= 0
+      if (outSize)
+        *outSize = out - line;
+
+      /* Reset the line so that we don't think it's partial next time. */
+      *line = 0;
+
+      if (status < 0) /* abort */
+      goto DONE;
+    }
+  }
+
+  status = 1;
+
+ DONE:
+
+  return status;
+}
+
+static int
+mime_decode_yenc_buffer (MimeDecoderData *data,
+            const char *input_buffer, int32_t input_length, int32_t *outSize)
+{
+  /* First, copy input_buffer into state->line_buffer until we have
+   a complete line.
+
+   Then decode that line in place (in the line_buffer) and write
+   it out.
+
+   Then pull the next line into line_buffer and continue.
+   */
+  if (!data->line_buffer)
+  {
+    data->line_buffer_size = 1000; // let make sure we have plenty of space for the header line
+    data->line_buffer = (char *)PR_MALLOC(data->line_buffer_size);
+    if (!data->line_buffer)
+      return -1;
+    data->line_buffer[0] = 0;
+  }
+
+  int status = 0;
+  char *line = data->line_buffer;
+  char *line_end = data->line_buffer + data->line_buffer_size - 1;
+
+  NS_ASSERTION(data->encoding == mime_yencode, "wrong decoder!");
+  if (data->encoding != mime_yencode) return -1;
+
+  if (data->ds_state == DS_END)
+    return 0;
+
+  while (input_length > 0)
+  {
+    /* Copy data from input_buffer to `line' until we have a complete line,
+       or until we've run out of input.
+
+       (line may have data in it already if the last time we were called,
+       we weren't called with a buffer that ended on a line boundary.)
+    */
+    {
+      char *out = line + strlen(line);
+      while (input_length > 0 && out < line_end)
+      {
+        *out++ = *input_buffer++;
+        input_length--;
+
+        if (out[-1] == '\r' || out[-1] == '\n')
+        {
+          /* If we just copied a CR, and an LF is waiting, grab it too. */
+          if (out[-1] == '\r' &&
+                  input_length > 0 &&
+                  *input_buffer == '\n')
+            input_buffer++, input_length--;
+
+           /* We have a line. */
+           break;
+        }
+      }
+      *out = 0;
+
+      /* Ignore blank lines. */
+      if (*line == '\r' || *line == '\n')
+      {
+        *line = 0;
+        continue;
+      }
+
+      /* If this line was bigger than our buffer, truncate it.
+         (This means the data was way corrupted, and there's basically
+         no chance of decoding it properly, but give it a shot anyway.)
+      */
+      if (out == line_end)
+      {
+        out--;
+        out[-1] = '\r';
+        out[0] = 0;
+      }
+
+      /* If we didn't get a complete line, simply return; we'll be called
+         with the rest of this line next time.
+      */
+      if (out[-1] != '\r' && out[-1] != '\n')
+      {
+        NS_ASSERTION (input_length == 0, "empty buffer!");
+        break;
+      }
+    }
+
+
+    /* Now we have a complete line.  Deal with it.
+     */
+    const char * endOfLine = line + strlen(line);
+
+    if (data->ds_state == DS_BEGIN)
+    {
+      int new_line_size = 0;
+      /* this yenc decoder does not support yenc v2 or multipart yenc.
+         Therefore, we are looking first for "=ybegin line="
+      */
+      if ((endOfLine - line) >= 13 && !strncmp (line, "=ybegin line=", 13))
+      {
+        /* ...then couple digits. */
+        for (line += 13; line < endOfLine; line ++)
+        {
+          if (*line < '0' || *line > '9')
+            break;
+          new_line_size = (new_line_size * 10) + *line - '0';
+        }
+
+        /* ...next, look for <space>size= */
+        if ((endOfLine - line) >= 6 && !strncmp (line, " size=", 6))
+        {
+          /* ...then couple digits. */
+          for (line += 6; line < endOfLine; line ++)
+            if (*line < '0' || *line > '9')
+              break;
+
+          /* ...next, look for <space>name= */
+          if ((endOfLine - line) >= 6 && !strncmp (line, " name=", 6))
+          {
+            /* we have found the yenc header line.
+               Now check if we need to grow our buffer line
+            */
+            data->ds_state = DS_BODY;
+            if (new_line_size > data->line_buffer_size && new_line_size <= 997) /* don't let bad value hurt us! */
+            {
+              PR_Free(data->line_buffer);
+              data->line_buffer_size = new_line_size + 4; //extra chars for line ending and potential escape char
+              data->line_buffer = (char *)PR_MALLOC(data->line_buffer_size);
+              if (!data->line_buffer)
+                return -1;
+            }
+          }
+        }
+
+      }
+      *data->line_buffer = 0;
+      continue;
+    }
+
+    if (data->ds_state == DS_BODY && line[0] == '=')
+    {
+      /* look if this this the final line */
+      if (!strncmp (line, "=yend size=", 11))
+      {
+        /* done! */
+        data->ds_state = DS_END;
+        *line = 0;
+        break;
+      }
+    }
+
+    /* We're in DS_BODY.  Decode the line in place. */
+    {
+      char *src = line;
+      char *dest = src;
+      char c;
+      for (; src < line_end; src ++)
+      {
+        c = *src;
+        if (!c || c == '\r' || c == '\n')
+          break;
+
+        if (c == '=')
+        {
+          src++;
+          c = *src;
+          if (c == 0)
+            return -1;  /* last character cannot be escape char */
+          c -= 64;
+        }
+        c -= 42;
+        *dest = c;
+        dest ++;
+      }
+
+      // The assertion below is helpful, too
+      if (outSize)
+        *outSize = dest - line;
+
+      /* Now write out what we decoded for this line. */
+      NS_ASSERTION(dest >= line && dest <= src, "nothing to write!");
+      if (dest > line)
+      {
+        status = data->write_buffer (line, dest - line, data->closure);
+        if (status < 0) /* abort */
+          return status;
+      }
+
+      /* Reset the line so that we don't think it's partial next time. */
+      *line = 0;
+    }
+  }
+
+  return 1;
+}
+
+int
+MimeDecoderDestroy (MimeDecoderData *data, bool abort_p)
+{
+  int status = 0;
+  /* Flush out the last few buffered characters. */
+  if (!abort_p &&
+    data->token_size > 0 &&
+    data->token[0] != '=')
+  {
+    if (data->encoding == mime_Base64)
+    while ((unsigned int)data->token_size < sizeof (data->token))
+      data->token [data->token_size++] = '=';
+
+    status = data->write_buffer (data->token, data->token_size,
+                   data->closure);
+  }
+
+  if (data->line_buffer)
+    PR_Free(data->line_buffer);
+  PR_Free (data);
+  return status;
+}
+
+
+static MimeDecoderData *
+mime_decoder_init (mime_encoding which,
+           MimeConverterOutputCallback output_fn,
+           void *closure)
+{
+  MimeDecoderData *data = PR_NEW(MimeDecoderData);
+  if (!data) return 0;
+  memset(data, 0, sizeof(*data));
+  data->encoding = which;
+  data->write_buffer = output_fn;
+  data->closure = closure;
+  data->line_buffer_size = 0;
+  data->line_buffer = nullptr;
+
+  return data;
+}
+
+MimeDecoderData *
+MimeB64DecoderInit (MimeConverterOutputCallback output_fn, void *closure)
+{
+  return mime_decoder_init (mime_Base64, output_fn, closure);
+}
+
+MimeDecoderData *
+MimeQPDecoderInit (MimeConverterOutputCallback output_fn,
+           void *closure, MimeObject *object)
+{
+  MimeDecoderData *retData = mime_decoder_init (mime_QuotedPrintable, output_fn, closure);
+  if (retData)
+    retData->objectToDecode = object;
+  return retData;
+}
+
+MimeDecoderData *
+MimeUUDecoderInit (MimeConverterOutputCallback output_fn,
+           void *closure)
+{
+  return mime_decoder_init (mime_uuencode, output_fn, closure);
+}
+
+MimeDecoderData *
+MimeYDecoderInit (MimeConverterOutputCallback output_fn,
+           void *closure)
+{
+  return mime_decoder_init (mime_yencode, output_fn, closure);
+}
+
+int
+MimeDecoderWrite (MimeDecoderData *data, const char *buffer, int32_t size,
+          int32_t *outSize)
+{
+  NS_ASSERTION(data, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+  if (!data) return -1;
+  switch(data->encoding)
+  {
+  case mime_Base64:
+    return mime_decode_base64_buffer (data, buffer, size, outSize);
+  case mime_QuotedPrintable:
+    return mime_decode_qp_buffer (data, buffer, size, outSize);
+  case mime_uuencode:
+    return mime_decode_uue_buffer (data, buffer, size, outSize);
+  case mime_yencode:
+    return mime_decode_yenc_buffer (data, buffer, size, outSize);
+  default:
+    NS_ERROR("Invalid decoding");
+    return -1;
+  }
+}
+
+
+namespace mozilla {
+namespace mailnews {
+
+MimeEncoder::MimeEncoder(OutputCallback callback, void *closure)
+: mCallback(callback),
+  mClosure(closure),
+  mCurrentColumn(0)
+{}
+
+class Base64Encoder : public MimeEncoder {
+  unsigned char in_buffer[3];
+  int32_t in_buffer_count;
+
+public:
+  Base64Encoder(OutputCallback callback, void *closure)
+    : MimeEncoder(callback, closure),
+      in_buffer_count(0) {}
+  virtual ~Base64Encoder() {}
+
+  virtual nsresult Write(const char *buffer, int32_t size) override;
+  virtual nsresult Flush() override;
+
+private:
+  static void Base64EncodeBits(RangedPtr<char> &out, uint32_t bits);
+};
+
+nsresult Base64Encoder::Write(const char *buffer, int32_t size)
+{
+  if (size == 0)
+    return NS_OK;
+  else if (size < 0)
+  {
+    NS_ERROR("Size is less than 0");
+    return NS_ERROR_FAILURE;
+  }
+
+  // If this input buffer is too small, wait until next time.
+  if (size < (3 - in_buffer_count))
+  {
+    NS_ASSERTION(size == 1 || size == 2, "Unexpected size");
+    in_buffer[in_buffer_count++] = buffer[0];
+    if (size == 2)
+      in_buffer[in_buffer_count++] = buffer[1];
+    NS_ASSERTION(in_buffer_count < 3, "Unexpected out buffer size");
+    return NS_OK;
+  }
+
+
+  // If there are bytes that were put back last time, take them now.
+  uint32_t i = in_buffer_count, bits = 0;
+  if (in_buffer_count > 0) bits = in_buffer[0];
+  if (in_buffer_count > 1) bits = (bits << 8) + in_buffer[1];
+  in_buffer_count = 0;
+
+  // If this buffer is not a multiple of three, put one or two bytes back.
+  uint32_t excess = ((size + i) % 3);
+  if (excess)
+  {
+    in_buffer[0] = buffer[size - excess];
+    if (excess > 1)
+      in_buffer [1] = buffer[size - excess + 1];
+    in_buffer_count = excess;
+    size -= excess;
+    NS_ASSERTION (! ((size + i) % 3), "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
+  }
+
+  const uint8_t *in = (const uint8_t *)buffer;
+  const uint8_t *end = (const uint8_t *)(buffer + size);
+  MOZ_ASSERT((end - in + i) % 3 == 0, "Need a multiple of 3 bytes to decode");
+
+  // Populate the out_buffer with base64 data, one line at a time.
+  char out_buffer[80]; // Max line length will be 80, so this is safe.
+  RangedPtr<char> out(out_buffer);
+  while (in < end)
+  {
+    // Accumulate the input bits.
+    while (i < 3)
+    {
+      bits = (bits << 8) | *in++;
+      i++;
+    }
+    i = 0;
+
+    Base64EncodeBits(out, bits);
+
+    mCurrentColumn += 4;
+    if (mCurrentColumn >= 72)
+    {
+      // Do a linebreak before column 76.  Flush out the line buffer.
+      mCurrentColumn = 0;
+      *out++ = '\x0D';
+      *out++ = '\x0A';
+      nsresult rv = mCallback(out_buffer, (out.get() - out_buffer), mClosure);
+      NS_ENSURE_SUCCESS(rv, rv);
+      out = out_buffer;
+    }
+  }
+
+  // Write out the unwritten portion of the last line buffer.
+  if (out.get() > out_buffer)
+  {
+    nsresult rv = mCallback(out_buffer, out.get() - out_buffer, mClosure);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return NS_OK;
+}
+
+nsresult Base64Encoder::Flush()
+{
+  if (in_buffer_count == 0)
+    return NS_OK;
+
+  // Since we need to some buffering to get a multiple of three bytes on each
+  // block, there may be a few bytes left in the buffer after the last block has
+  // been written. We need to flush those out now.
+  char buf[4];
+  RangedPtr<char> out(buf);
+  uint32_t bits = ((uint32_t)in_buffer[0]) << 16;
+  if (in_buffer_count > 1)
+    bits |= (((uint32_t)in_buffer[1]) << 8);
+
+  Base64EncodeBits(out, bits);
+
+  // Pad with equal-signs.
+  if (in_buffer_count == 1)
+    buf[2] = '=';
+  buf[3] = '=';
+
+  return mCallback(buf, 4, mClosure);
+}
+
+void Base64Encoder::Base64EncodeBits(RangedPtr<char> &out, uint32_t bits)
+{
+  // Convert 3 bytes to 4 base64 bytes
+  for (int32_t j = 18; j >= 0; j -= 6)
+  {
+    unsigned int k = (bits >> j) & 0x3F;
+    if (k < 26)       *out++ = k      + 'A';
+    else if (k < 52)  *out++ = k - 26 + 'a';
+    else if (k < 62)  *out++ = k - 52 + '0';
+    else if (k == 62) *out++ = '+';
+    else if (k == 63) *out++ = '/';
+    else MOZ_CRASH("6 bits should only be between 0 and 64");
+  }
+}
+
+class QPEncoder : public MimeEncoder {
+public:
+  QPEncoder(OutputCallback callback, void *closure)
+    : MimeEncoder(callback, closure) {}
+  virtual ~QPEncoder() {}
+
+  virtual nsresult Write(const char *buffer, int32_t size) override;
+};
+
+nsresult QPEncoder::Write(const char *buffer, int32_t size)
+{
+  nsresult rv = NS_OK;
+  static const char *hexdigits = "0123456789ABCDEF";
+  char out_buffer[80];
+  RangedPtr<char> out(out_buffer);
+  bool white = false;
+
+  // Populate the out_buffer with quoted-printable data, one line at a time.
+  const uint8_t *in = (uint8_t *)buffer;
+  const uint8_t *end = in + size;
+  for (; in < end; in++)
+  {
+    if (*in == '\r' || *in == '\n')
+    {
+      // If it's CRLF, swallow two chars instead of one.
+      if (in + 1 < end && in[0] == '\r' && in[1] == '\n')
+        in++;
+
+      // Whitespace cannot be allowed to occur at the end of the line, so we
+      // back up and replace the whitespace with its code.
+      if (white)
+      {
+        out--;
+        char whitespace_char = *out;
+        *out++ = '=';
+        *out++ = hexdigits[whitespace_char >> 4];
+        *out++ = hexdigits[whitespace_char & 0xF];
+      }
+
+      // Now write out the newline.
+      *out++ = '\r';
+      *out++ = '\n';
+      white = false;
+
+      rv = mCallback(out_buffer, out.get() - out_buffer, mClosure);
+      NS_ENSURE_SUCCESS(rv, rv);
+      out = out_buffer;
+      mCurrentColumn = 0;
+    }
+    else if (mCurrentColumn == 0 && *in == '.')
+    {
+      // Just to be SMTP-safe, if "." appears in column 0, encode it.
+      goto HEX;
+    }
+    else if (mCurrentColumn == 0 && *in == 'F'
+               && (in >= end-1 || in[1] == 'r')
+               && (in >= end-2 || in[2] == 'o')
+               && (in >= end-3 || in[3] == 'm')
+               && (in >= end-4 || in[4] == ' '))
+    {
+      // If this line begins with "From " (or it could but we don't have enough
+      // data in the buffer to be certain), encode the 'F' in hex to avoid
+      // potential problems with BSD mailbox formats.
+      goto HEX;
+    }
+    else if ((*in >= 33 && *in <= 60) |
+             (*in >= 62 && *in <= 126)) // Printable characters except for '='
+    {
+      white = false;
+      *out++ = *in;
+      mCurrentColumn++;
+    }
+    else if (*in == ' ' || *in == '\t') // Whitespace
+    {
+      white = true;
+      *out++ = *in;
+      mCurrentColumn++;
+    }
+    else
+    {
+      // Encode the characters here
+HEX:
+      white = false;
+      *out++ = '=';
+      *out++ = hexdigits[*in >> 4];
+      *out++ = hexdigits[*in & 0xF];
+      mCurrentColumn += 3;
+    }
+
+    MOZ_ASSERT(mCurrentColumn <= 76, "Why haven't we added a line break yet?");
+
+    if (mCurrentColumn >= 73) // Soft line break for readability
+    {
+      *out++ = '=';
+      *out++ = '\r';
+      *out++ = '\n';
+
+      rv = mCallback(out_buffer, out.get() - out_buffer, mClosure);
+      NS_ENSURE_SUCCESS(rv, rv);
+      out = out_buffer;
+      white = false;
+      mCurrentColumn = 0;
+    }
+  }
+
+  // Write out the unwritten portion of the last line buffer.
+  if (out.get() != out_buffer)
+  {
+    rv = mCallback(out_buffer, out.get() - out_buffer, mClosure);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return NS_OK;
+}
+
+MimeEncoder *MimeEncoder::GetBase64Encoder(OutputCallback callback,
+    void *closure)
+{
+  return new Base64Encoder(callback, closure);
+}
+
+MimeEncoder *MimeEncoder::GetQPEncoder(OutputCallback callback, void *closure)
+{
+  return new QPEncoder(callback, closure);
+}
+
+} // namespace mailnews
+} // namespace mozilla