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-rw-r--r--src/base64.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/src/base64.c b/src/base64.c
new file mode 100644
index 0000000..bf2bf6a
--- /dev/null
+++ b/src/base64.c
@@ -0,0 +1,127 @@
+/* This file is part of GDBM, the GNU data base manager.
+ Copyright (C) 2011 Free Software Foundation, Inc.
+
+ GDBM 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, or (at your option)
+ any later version.
+
+ GDBM 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 GDBM. If not, see <http://www.gnu.org/licenses/>. */
+
+# include "autoconf.h"
+# include "gdbmdefs.h"
+# include "gdbm.h"
+
+static char b64tab[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+static int b64val[128] = {
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
+ -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+ 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
+ -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+ 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1
+};
+
+int
+_gdbm_base64_encode (const unsigned char *input, size_t input_len,
+ unsigned char **output, size_t *output_size,
+ size_t *nbytes)
+{
+ size_t olen = 4 * (input_len + 2) / 3 + 1;
+ unsigned char *out;
+
+ if (olen > *output_size)
+ {
+ out = realloc (*output, olen);
+ if (!out)
+ return GDBM_MALLOC_ERROR;
+ *output = out;
+ *output_size = olen;
+ }
+ else
+ out = *output;
+
+ while (input_len >= 3)
+ {
+ *out++ = b64tab[input[0] >> 2];
+ *out++ = b64tab[((input[0] << 4) & 0x30) | (input[1] >> 4)];
+ *out++ = b64tab[((input[1] << 2) & 0x3c) | (input[2] >> 6)];
+ *out++ = b64tab[input[2] & 0x3f];
+ input_len -= 3;
+ input += 3;
+ }
+
+ if (input_len > 0)
+ {
+ unsigned char c = (input[0] << 4) & 0x30;
+ *out++ = b64tab[input[0] >> 2];
+ if (input_len > 1)
+ c |= input[1] >> 4;
+ *out++ = b64tab[c];
+ *out++ = (input_len < 2) ? '=' : b64tab[(input[1] << 2) & 0x3c];
+ *out++ = '=';
+ }
+ *out = 0;
+ *nbytes = out - *output;
+ return 0;
+}
+
+int
+_gdbm_base64_decode (const unsigned char *input, size_t input_len,
+ unsigned char **output, size_t *output_size,
+ size_t *inbytes, size_t *outbytes)
+{
+ int rc = 0;
+ int olen = input_len;
+ unsigned char *out;
+ size_t ins = 0;
+
+ if (olen > *output_size)
+ {
+ out = realloc (*output, olen);
+ if (!out)
+ return GDBM_MALLOC_ERROR;
+ *output = out;
+ *output_size = olen;
+ }
+ else
+ out = *output;
+
+ do
+ {
+ if (input_len < 4)
+ break;
+ if (input[0] > 127 || b64val[input[0]] == -1
+ || input[1] > 127 || b64val[input[1]] == -1
+ || input[2] > 127 || ((input[2] != '=') && (b64val[input[2]] == -1))
+ || input[3] > 127 || ((input[3] != '=')
+ && (b64val[input[3]] == -1)))
+ {
+ rc = GDBM_ILLEGAL_DATA;
+ break;
+ }
+ *out++ = (b64val[input[0]] << 2) | (b64val[input[1]] >> 4);
+ if (input[2] != '=')
+ {
+ *out++ = ((b64val[input[1]] << 4) & 0xf0) | (b64val[input[2]] >> 2);
+ if (input[3] != '=')
+ *out++ = ((b64val[input[2]] << 6) & 0xc0) | b64val[input[3]];
+ }
+ input += 4;
+ input_len -= 4;
+ ins += 4;
+ }
+ while (input_len > 0);
+ *inbytes = ins;
+ *outbytes = out - *output;
+ return rc;
+}

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