use gnulib's base64 module, now that it's sync'd to match this one

* gl/lib/base64.c: Remove file.
* gl/lib/base64.h: Remove file.

2 files changed, 0 insertions, 635 deletions

diff --git a/gl/lib/base64.c b/gl/lib/base64.c
deleted file mode 100644
index a33f10216..000000000
--- a/gl/lib/base64.c
+++ /dev/null
@@ -1,575 +0,0 @@
-/* base64.c -- Encode binary data using printable characters.
-   Copyright (C) 1999, 2000, 2001, 2004, 2005, 2006, 2007 Free Software
-   Foundation, Inc.
-
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-/* Written by Simon Josefsson.  Partially adapted from GNU MailUtils
- * (mailbox/filter_trans.c, as of 2004-11-28).  Improved by review
- * from Paul Eggert, Bruno Haible, and Stepan Kasal.
- *
- * See also RFC 3548 <http://www.ietf.org/rfc/rfc3548.txt>.
- *
- * Be careful with error checking.  Here is how you would typically
- * use these functions:
- *
- * bool ok = base64_decode_alloc (in, inlen, &out, &outlen);
- * if (!ok)
- *   FAIL: input was not valid base64
- * if (out == NULL)
- *   FAIL: memory allocation error
- * OK: data in OUT/OUTLEN
- *
- * size_t outlen = base64_encode_alloc (in, inlen, &out);
- * if (out == NULL && outlen == 0 && inlen != 0)
- *   FAIL: input too long
- * if (out == NULL)
- *   FAIL: memory allocation error
- * OK: data in OUT/OUTLEN.
- *
- */
-
-#include <config.h>
-
-/* Get prototype. */
-#include "base64.h"
-
-/* Get malloc. */
-#include <stdlib.h>
-
-/* Get UCHAR_MAX. */
-#include <limits.h>
-
-#include <string.h>
-
-/* C89 compliant way to cast 'char' to 'unsigned char'. */
-static inline unsigned char
-to_uchar (char ch)
-{
-  return ch;
-}
-
-/* Base64 encode IN array of size INLEN into OUT array of size OUTLEN.
-   If OUTLEN is less than BASE64_LENGTH(INLEN), write as many bytes as
-   possible.  If OUTLEN is larger than BASE64_LENGTH(INLEN), also zero
-   terminate the output buffer. */
-void
-base64_encode (const char *restrict in, size_t inlen,
-	       char *restrict out, size_t outlen)
-{
-  static const char b64str[64] =
-    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
-  while (inlen && outlen)
-    {
-      *out++ = b64str[(to_uchar (in[0]) >> 2) & 0x3f];
-      if (!--outlen)
-	break;
-      *out++ = b64str[((to_uchar (in[0]) << 4)
-		       + (--inlen ? to_uchar (in[1]) >> 4 : 0))
-		      & 0x3f];
-      if (!--outlen)
-	break;
-      *out++ =
-	(inlen
-	 ? b64str[((to_uchar (in[1]) << 2)
-		   + (--inlen ? to_uchar (in[2]) >> 6 : 0))
-		  & 0x3f]
-	 : '=');
-      if (!--outlen)
-	break;
-      *out++ = inlen ? b64str[to_uchar (in[2]) & 0x3f] : '=';
-      if (!--outlen)
-	break;
-      if (inlen)
-	inlen--;
-      if (inlen)
-	in += 3;
-    }
-
-  if (outlen)
-    *out = '\0';
-}
-
-/* Allocate a buffer and store zero terminated base64 encoded data
-   from array IN of size INLEN, returning BASE64_LENGTH(INLEN), i.e.,
-   the length of the encoded data, excluding the terminating zero.  On
-   return, the OUT variable will hold a pointer to newly allocated
-   memory that must be deallocated by the caller.  If output string
-   length would overflow, 0 is returned and OUT is set to NULL.  If
-   memory allocation failed, OUT is set to NULL, and the return value
-   indicates length of the requested memory block, i.e.,
-   BASE64_LENGTH(inlen) + 1. */
-size_t
-base64_encode_alloc (const char *in, size_t inlen, char **out)
-{
-  size_t outlen = 1 + BASE64_LENGTH (inlen);
-
-  /* Check for overflow in outlen computation.
-   *
-   * If there is no overflow, outlen >= inlen.
-   *
-   * If the operation (inlen + 2) overflows then it yields at most +1, so
-   * outlen is 0.
-   *
-   * If the multiplication overflows, we lose at least half of the
-   * correct value, so the result is < ((inlen + 2) / 3) * 2, which is
-   * less than (inlen + 2) * 0.66667, which is less than inlen as soon as
-   * (inlen > 4).
-   */
-  if (inlen > outlen)
-    {
-      *out = NULL;
-      return 0;
-    }
-
-  *out = malloc (outlen);
-  if (!*out)
-    return outlen;
-
-  base64_encode (in, inlen, *out, outlen);
-
-  return outlen - 1;
-}
-
-/* With this approach this file works independent of the charset used
-   (think EBCDIC).  However, it does assume that the characters in the
-   Base64 alphabet (A-Za-z0-9+/) are encoded in 0..255.  POSIX
-   1003.1-2001 require that char and unsigned char are 8-bit
-   quantities, though, taking care of that problem.  But this may be a
-   potential problem on non-POSIX C99 platforms.
-
-   IBM C V6 for AIX mishandles "#define B64(x) ...'x'...", so use "_"
-   as the formal parameter rather than "x".  */
-#define B64(_)					\
-  ((_) == 'A' ? 0				\
-   : (_) == 'B' ? 1				\
-   : (_) == 'C' ? 2				\
-   : (_) == 'D' ? 3				\
-   : (_) == 'E' ? 4				\
-   : (_) == 'F' ? 5				\
-   : (_) == 'G' ? 6				\
-   : (_) == 'H' ? 7				\
-   : (_) == 'I' ? 8				\
-   : (_) == 'J' ? 9				\
-   : (_) == 'K' ? 10				\
-   : (_) == 'L' ? 11				\
-   : (_) == 'M' ? 12				\
-   : (_) == 'N' ? 13				\
-   : (_) == 'O' ? 14				\
-   : (_) == 'P' ? 15				\
-   : (_) == 'Q' ? 16				\
-   : (_) == 'R' ? 17				\
-   : (_) == 'S' ? 18				\
-   : (_) == 'T' ? 19				\
-   : (_) == 'U' ? 20				\
-   : (_) == 'V' ? 21				\
-   : (_) == 'W' ? 22				\
-   : (_) == 'X' ? 23				\
-   : (_) == 'Y' ? 24				\
-   : (_) == 'Z' ? 25				\
-   : (_) == 'a' ? 26				\
-   : (_) == 'b' ? 27				\
-   : (_) == 'c' ? 28				\
-   : (_) == 'd' ? 29				\
-   : (_) == 'e' ? 30				\
-   : (_) == 'f' ? 31				\
-   : (_) == 'g' ? 32				\
-   : (_) == 'h' ? 33				\
-   : (_) == 'i' ? 34				\
-   : (_) == 'j' ? 35				\
-   : (_) == 'k' ? 36				\
-   : (_) == 'l' ? 37				\
-   : (_) == 'm' ? 38				\
-   : (_) == 'n' ? 39				\
-   : (_) == 'o' ? 40				\
-   : (_) == 'p' ? 41				\
-   : (_) == 'q' ? 42				\
-   : (_) == 'r' ? 43				\
-   : (_) == 's' ? 44				\
-   : (_) == 't' ? 45				\
-   : (_) == 'u' ? 46				\
-   : (_) == 'v' ? 47				\
-   : (_) == 'w' ? 48				\
-   : (_) == 'x' ? 49				\
-   : (_) == 'y' ? 50				\
-   : (_) == 'z' ? 51				\
-   : (_) == '0' ? 52				\
-   : (_) == '1' ? 53				\
-   : (_) == '2' ? 54				\
-   : (_) == '3' ? 55				\
-   : (_) == '4' ? 56				\
-   : (_) == '5' ? 57				\
-   : (_) == '6' ? 58				\
-   : (_) == '7' ? 59				\
-   : (_) == '8' ? 60				\
-   : (_) == '9' ? 61				\
-   : (_) == '+' ? 62				\
-   : (_) == '/' ? 63				\
-   : -1)
-
-static const signed char b64[0x100] = {
-  B64 (0), B64 (1), B64 (2), B64 (3),
-  B64 (4), B64 (5), B64 (6), B64 (7),
-  B64 (8), B64 (9), B64 (10), B64 (11),
-  B64 (12), B64 (13), B64 (14), B64 (15),
-  B64 (16), B64 (17), B64 (18), B64 (19),
-  B64 (20), B64 (21), B64 (22), B64 (23),
-  B64 (24), B64 (25), B64 (26), B64 (27),
-  B64 (28), B64 (29), B64 (30), B64 (31),
-  B64 (32), B64 (33), B64 (34), B64 (35),
-  B64 (36), B64 (37), B64 (38), B64 (39),
-  B64 (40), B64 (41), B64 (42), B64 (43),
-  B64 (44), B64 (45), B64 (46), B64 (47),
-  B64 (48), B64 (49), B64 (50), B64 (51),
-  B64 (52), B64 (53), B64 (54), B64 (55),
-  B64 (56), B64 (57), B64 (58), B64 (59),
-  B64 (60), B64 (61), B64 (62), B64 (63),
-  B64 (64), B64 (65), B64 (66), B64 (67),
-  B64 (68), B64 (69), B64 (70), B64 (71),
-  B64 (72), B64 (73), B64 (74), B64 (75),
-  B64 (76), B64 (77), B64 (78), B64 (79),
-  B64 (80), B64 (81), B64 (82), B64 (83),
-  B64 (84), B64 (85), B64 (86), B64 (87),
-  B64 (88), B64 (89), B64 (90), B64 (91),
-  B64 (92), B64 (93), B64 (94), B64 (95),
-  B64 (96), B64 (97), B64 (98), B64 (99),
-  B64 (100), B64 (101), B64 (102), B64 (103),
-  B64 (104), B64 (105), B64 (106), B64 (107),
-  B64 (108), B64 (109), B64 (110), B64 (111),
-  B64 (112), B64 (113), B64 (114), B64 (115),
-  B64 (116), B64 (117), B64 (118), B64 (119),
-  B64 (120), B64 (121), B64 (122), B64 (123),
-  B64 (124), B64 (125), B64 (126), B64 (127),
-  B64 (128), B64 (129), B64 (130), B64 (131),
-  B64 (132), B64 (133), B64 (134), B64 (135),
-  B64 (136), B64 (137), B64 (138), B64 (139),
-  B64 (140), B64 (141), B64 (142), B64 (143),
-  B64 (144), B64 (145), B64 (146), B64 (147),
-  B64 (148), B64 (149), B64 (150), B64 (151),
-  B64 (152), B64 (153), B64 (154), B64 (155),
-  B64 (156), B64 (157), B64 (158), B64 (159),
-  B64 (160), B64 (161), B64 (162), B64 (163),
-  B64 (164), B64 (165), B64 (166), B64 (167),
-  B64 (168), B64 (169), B64 (170), B64 (171),
-  B64 (172), B64 (173), B64 (174), B64 (175),
-  B64 (176), B64 (177), B64 (178), B64 (179),
-  B64 (180), B64 (181), B64 (182), B64 (183),
-  B64 (184), B64 (185), B64 (186), B64 (187),
-  B64 (188), B64 (189), B64 (190), B64 (191),
-  B64 (192), B64 (193), B64 (194), B64 (195),
-  B64 (196), B64 (197), B64 (198), B64 (199),
-  B64 (200), B64 (201), B64 (202), B64 (203),
-  B64 (204), B64 (205), B64 (206), B64 (207),
-  B64 (208), B64 (209), B64 (210), B64 (211),
-  B64 (212), B64 (213), B64 (214), B64 (215),
-  B64 (216), B64 (217), B64 (218), B64 (219),
-  B64 (220), B64 (221), B64 (222), B64 (223),
-  B64 (224), B64 (225), B64 (226), B64 (227),
-  B64 (228), B64 (229), B64 (230), B64 (231),
-  B64 (232), B64 (233), B64 (234), B64 (235),
-  B64 (236), B64 (237), B64 (238), B64 (239),
-  B64 (240), B64 (241), B64 (242), B64 (243),
-  B64 (244), B64 (245), B64 (246), B64 (247),
-  B64 (248), B64 (249), B64 (250), B64 (251),
-  B64 (252), B64 (253), B64 (254), B64 (255)
-};
-
-#if UCHAR_MAX == 255
-# define uchar_in_range(c) true
-#else
-# define uchar_in_range(c) ((c) <= 255)
-#endif
-
-/* Return true if CH is a character from the Base64 alphabet, and
-   false otherwise.  Note that '=' is padding and not considered to be
-   part of the alphabet.  */
-bool
-isbase64 (char ch)
-{
-  return uchar_in_range (to_uchar (ch)) && 0 <= b64[to_uchar (ch)];
-}
-
-/* Initialize decode-context buffer, CTX.  */
-void
-base64_decode_ctx_init (struct base64_decode_context *ctx)
-{
-  ctx->i = 0;
-}
-
-/* If CTX->i is 0 or 4, there are four or more bytes in [*IN..IN_END), and
-   none of those four is a newline, then return *IN.  Otherwise, copy up to
-   4 - CTX->i non-newline bytes from that range into CTX->buf, starting at
-   index CTX->i and setting CTX->i to reflect the number of bytes copied,
-   and return CTX->buf.  In either case, advance *IN to point to the byte
-   after the last one processed, and set *N_NON_NEWLINE to the number of
-   verified non-newline bytes accessible through the returned pointer.  */
-static inline char *
-get_4 (struct base64_decode_context *ctx,
-       char const *restrict *in, char const *restrict in_end,
-       size_t *n_non_newline)
-{
-  if (ctx->i == 4)
-    ctx->i = 0;
-
-  if (ctx->i == 0)
-    {
-      char const *t = *in;
-      if (4 <= in_end - *in && memchr (t, '\n', 4) == NULL)
-	{
-	  /* This is the common case: no newline.  */
-	  *in += 4;
-	  *n_non_newline = 4;
-	  return (char *) t;
-	}
-    }
-
-  {
-    /* Copy non-newline bytes into BUF.  */
-    char const *p = *in;
-    while (p < in_end)
-      {
-	char c = *p++;
-	if (c != '\n')
-	  {
-	    ctx->buf[ctx->i++] = c;
-	    if (ctx->i == 4)
-	      break;
-	  }
-      }
-
-    *in = p;
-    *n_non_newline = ctx->i;
-    return ctx->buf;
-  }
-}
-
-#define return_false				\
-  do						\
-    {						\
-      *outp = out;				\
-      return false;				\
-    }						\
-  while (false)
-
-/* Decode up to four bytes of base64-encoded data, IN, of length INLEN
-   into the output buffer, *OUT, of size *OUTLEN bytes.  Return true if
-   decoding is successful, false otherwise.  If *OUTLEN is too small,
-   as many bytes as possible are written to *OUT.  On return, advance
-   *OUT to point to the byte after the last one written, and decrement
-   *OUTLEN to reflect the number of bytes remaining in *OUT.  */
-static inline bool
-decode_4 (char const *restrict in, size_t inlen,
-	  char *restrict *outp, size_t *outleft)
-{
-  char *out = *outp;
-  if (inlen < 2)
-    return false;
-
-  if (!isbase64 (in[0]) || !isbase64 (in[1]))
-    return false;
-
-  if (*outleft)
-    {
-      *out++ = ((b64[to_uchar (in[0])] << 2)
-		| (b64[to_uchar (in[1])] >> 4));
-      --*outleft;
-    }
-
-  if (inlen == 2)
-    return_false;
-
-  if (in[2] == '=')
-    {
-      if (inlen != 4)
-	return_false;
-
-      if (in[3] != '=')
-	return_false;
-    }
-  else
-    {
-      if (!isbase64 (in[2]))
-	return_false;
-
-      if (*outleft)
-	{
-	  *out++ = (((b64[to_uchar (in[1])] << 4) & 0xf0)
-		    | (b64[to_uchar (in[2])] >> 2));
-	  --*outleft;
-	}
-
-      if (inlen == 3)
-	return_false;
-
-      if (in[3] == '=')
-	{
-	  if (inlen != 4)
-	    return_false;
-	}
-      else
-	{
-	  if (!isbase64 (in[3]))
-	    return_false;
-
-	  if (*outleft)
-	    {
-	      *out++ = (((b64[to_uchar (in[2])] << 6) & 0xc0)
-			| b64[to_uchar (in[3])]);
-	      --*outleft;
-	    }
-	}
-    }
-
-  *outp = out;
-  return true;
-}
-
-/* Decode base64-encoded input array IN of length INLEN to output array
-   OUT that can hold *OUTLEN bytes.  The input data may be interspersed
-   with newlines.  Return true if decoding was successful, i.e. if the
-   input was valid base64 data, false otherwise.  If *OUTLEN is too
-   small, as many bytes as possible will be written to OUT.  On return,
-   *OUTLEN holds the length of decoded bytes in OUT.  Note that as soon
-   as any non-alphabet, non-newline character is encountered, decoding
-   is stopped and false is returned.  If INLEN is zero, then process
-   only whatever data is stored in CTX.
-
-   Initially, CTX must have been initialized via base64_decode_ctx_init.
-   Subsequent calls to this function must reuse whatever state is recorded
-   in that buffer.  It is necessary for when a quadruple of base64 input
-   bytes spans two input buffers.
-
-   If CTX is NULL then newlines are treated as garbage and the input
-   buffer is processed as a unit.  */
-
-bool
-base64_decode_ctx (struct base64_decode_context *ctx,
-		   const char *restrict in, size_t inlen,
-		   char *restrict out, size_t *outlen)
-{
-  size_t outleft = *outlen;
-  bool ignore_newlines = ctx != NULL;
-  bool flush_ctx = false;
-  unsigned int ctx_i = 0;
-
-  if (ignore_newlines)
-    {
-      ctx_i = ctx->i;
-      flush_ctx = inlen == 0;
-    }
-
-
-  while (true)
-    {
-      size_t outleft_save = outleft;
-      if (ctx_i == 0 && !flush_ctx)
-	{
-	  while (true)
-	    {
-	      /* Save a copy of outleft, in case we need to re-parse this
-		 block of four bytes.  */
-	      outleft_save = outleft;
-	      if (!decode_4 (in, inlen, &out, &outleft))
-		break;
-
-	      in += 4;
-	      inlen -= 4;
-	    }
-	}
-
-      if (inlen == 0 && !flush_ctx)
-	break;
-
-      /* Handle the common case of 72-byte wrapped lines.
-	 This also handles any other multiple-of-4-byte wrapping.  */
-      if (inlen && *in == '\n' && ignore_newlines)
-	{
-	  ++in;
-	  --inlen;
-	  continue;
-	}
-
-      /* Restore OUT and OUTLEFT.  */
-      out -= outleft_save - outleft;
-      outleft = outleft_save;
-
-      {
-	char const *in_end = in + inlen;
-	char const *non_nl;
-
-	if (ignore_newlines)
-	  non_nl = get_4 (ctx, &in, in_end, &inlen);
-	else
-	  non_nl = in;  /* Might have nl in this case. */
-
-	/* If the input is empty or consists solely of newlines (0 non-newlines),
-	   then we're done.  Likewise if there are fewer than 4 bytes when not
-	   flushing context and not treating newlines as garbage.  */
-	if (inlen == 0 || (inlen < 4 && !flush_ctx && ignore_newlines))
-	  {
-	    inlen = 0;
-	    break;
-	  }
-	if (!decode_4 (non_nl, inlen, &out, &outleft))
-	  break;
-
-	inlen = in_end - in;
-      }
-    }
-
-  *outlen -= outleft;
-
-  return inlen == 0;
-}
-
-/* Allocate an output buffer in *OUT, and decode the base64 encoded
-   data stored in IN of size INLEN to the *OUT buffer.  On return, the
-   size of the decoded data is stored in *OUTLEN.  OUTLEN may be NULL,
-   if the caller is not interested in the decoded length.  *OUT may be
-   NULL to indicate an out of memory error, in which case *OUTLEN
-   contains the size of the memory block needed.  The function returns
-   true on successful decoding and memory allocation errors.  (Use the
-   *OUT and *OUTLEN parameters to differentiate between successful
-   decoding and memory error.)  The function returns false if the
-   input was invalid, in which case *OUT is NULL and *OUTLEN is
-   undefined. */
-bool
-base64_decode_alloc_ctx (struct base64_decode_context *ctx,
-			 const char *in, size_t inlen, char **out,
-			 size_t *outlen)
-{
-  /* This may allocate a few bytes too many, depending on input,
-     but it's not worth the extra CPU time to compute the exact size.
-     The exact size is 3 * inlen / 4, minus 1 if the input ends
-     with "=" and minus another 1 if the input ends with "==".
-     Dividing before multiplying avoids the possibility of overflow.  */
-  size_t needlen = 3 * (inlen / 4) + 2;
-
-  *out = malloc (needlen);
-  if (!*out)
-    return true;
-
-  if (!base64_decode_ctx (ctx, in, inlen, *out, &needlen))
-    {
-      free (*out);
-      *out = NULL;
-      return false;
-    }
-
-  if (outlen)
-    *outlen = needlen;
-
-  return true;
-}
diff --git a/gl/lib/base64.h b/gl/lib/base64.h
deleted file mode 100644
index fa242c82d..000000000
--- a/gl/lib/base64.h
+++ /dev/null
@@ -1,60 +0,0 @@
-/* base64.h -- Encode binary data using printable characters.
-   Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
-   Written by Simon Josefsson.
-
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#ifndef BASE64_H
-# define BASE64_H
-
-/* Get size_t. */
-# include <stddef.h>
-
-/* Get bool. */
-# include <stdbool.h>
-
-/* This uses that the expression (n+(k-1))/k means the smallest
-   integer >= n/k, i.e., the ceiling of n/k.  */
-# define BASE64_LENGTH(inlen) ((((inlen) + 2) / 3) * 4)
-
-struct base64_decode_context
-{
-  unsigned int i;
-  char buf[4];
-};
-
-extern bool isbase64 (char ch);
-
-extern void base64_encode (const char *restrict in, size_t inlen,
-			   char *restrict out, size_t outlen);
-
-extern size_t base64_encode_alloc (const char *in, size_t inlen, char **out);
-
-extern void base64_decode_ctx_init (struct base64_decode_context *ctx);
-
-extern bool base64_decode_ctx (struct base64_decode_context *ctx,
-			       const char *restrict in, size_t inlen,
-			       char *restrict out, size_t *outlen);
-
-extern bool base64_decode_alloc_ctx (struct base64_decode_context *ctx,
-				     const char *in, size_t inlen,
-				     char **out, size_t *outlen);
-
-#define base64_decode(in, inlen, out, outlen) \
-	base64_decode_ctx (NULL, in, inlen, out, outlen)
-
-#define base64_decode_alloc(in, inlen, out, outlen) \
-	base64_decode_alloc_ctx (NULL, in, inlen, out, outlen)
-
-#endif /* BASE64_H */