#include "base64.h"
#include <stdlib.h>
#include <limits.h>
#include <string.h>

Macros
#define	B64(_)

#define	return_false

#define	uchar_in_range(c) ((c) <= 255)

Functions
bool	base64_decode_alloc_ctx (struct base64_decode_context ctx, const char in, size_t inlen, char *out, size_t outlen)

bool	base64_decode_ctx (struct base64_decode_context ctx, const char in, size_t inlen, char out, size_t outlen)

void	base64_decode_ctx_init (struct base64_decode_context *ctx)

void	base64_encode (const char in, size_t inlen, char out, size_t outlen)

size_t	base64_encode_alloc (const char in, size_t inlen, char *out)

static bool	decode_4 (char const in, size_t inlen, char outp, size_t outleft)

static char *	get_4 (struct base64_decode_context ctx, char const in, char const in_end, size_t *n_non_newline)

bool	isbase64 (char ch)

static unsigned char	to_uchar (char ch)

Variables
static const signed char	b64 [0x100]

Macro Definition Documentation

#define B64 ( _ )

Definition at line 157 of file base64.cc.

#define return_false

Value:

do                                            \
    {                                           \
      *outp = out;                              \
      return false;                             \
    }                                           \
  while (false)

Definition at line 360 of file base64.cc.

Referenced by decode_4().

#define uchar_in_range ( c ) ((c) <= 255)

Definition at line 294 of file base64.cc.

Referenced by isbase64().

Function Documentation

bool base64_decode_alloc_ctx	(	struct base64_decode_context *	ctx,
		const char *	in,
		size_t	inlen,
		char **	out,
		size_t *	outlen
	)

Definition at line 551 of file base64.cc.

References base64_decode_ctx(), and NULL.

 {
   /* 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 + (ctx ? ctx->i : 0)) / 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) + 3;
 
   *out = static_cast<char*>(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;
 }

bool base64_decode_ctx	(	struct base64_decode_context *	ctx,
		const char *	in,
		size_t	inlen,
		char *	out,
		size_t *	outlen
	)

Definition at line 460 of file base64.cc.

References decode_4(), get_4(), base64_decode_context::i, recoMuon::in, and NULL.

Referenced by base64_decode_alloc_ctx().

 {
   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;
 }

void base64_decode_ctx_init ( struct base64_decode_context * ctx )

Definition at line 308 of file base64.cc.

References base64_decode_context::i.

 {
   ctx->i = 0;
 }

void base64_encode	(	const char *	in,
		size_t	inlen,
		char *	out,
		size_t	outlen
	)

Definition at line 70 of file base64.cc.

References b64str, and to_uchar().

 {
   static const char* b64str =
     "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';
 }

size_t base64_encode_alloc	(	const char *	in,
		size_t	inlen,
		char **	out
	)

Definition at line 117 of file base64.cc.

References base64_encode(), BASE64_LENGTH, and NULL.

Referenced by cond::Cipher::b64encrypt().

 {
   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 = static_cast<char*>(malloc (outlen));
   if (!*out)
     return outlen;
 
   base64_encode (in, inlen, *out, outlen);
 
   return outlen - 1;
 }

static bool decode_4	(	char const *	in,
		size_t	inlen,
		char **	outp,
		size_t *	outleft
	)

inlinestatic

Definition at line 375 of file base64.cc.

References b64, isbase64(), dbtoconf::out, return_false, and to_uchar().

Referenced by base64_decode_ctx().

 {
   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;
 }

static char* get_4	(	struct base64_decode_context *	ctx,
		char const **	in,
		char const *	in_end,
		size_t *	n_non_newline
	)

inlinestatic

Definition at line 321 of file base64.cc.

References base64_decode_context::buf, trackerHits::c, base64_decode_context::i, recoMuon::in, NULL, AlCaHLTBitMon_ParallelJobs::p, and edmStreamStallGrapher::t.

Referenced by base64_decode_ctx().

 {
   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;
   }
 }

bool isbase64 ( char ch )

Definition at line 301 of file base64.cc.

References b64, to_uchar(), and uchar_in_range.

Referenced by decode_4().

 {
   return uchar_in_range (to_uchar (ch)) && 0 <= b64[to_uchar (ch)];
 }

static unsigned char to_uchar ( char ch )

inlinestatic

Definition at line 60 of file base64.cc.

Referenced by base64_encode(), decode_4(), and isbase64().

 {
   return ch;
 }

Variable Documentation

const signed char b64[0x100]

static

Definition at line 224 of file base64.cc.

Referenced by decode_4(), and isbase64().

Macros

Functions

Variables

Macro Definition Documentation

Function Documentation

Variable Documentation