/* This file is part of GDBM, the GNU data base manager. Copyright (C) 2011, 2013, 2016-2018 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 . */ # 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; }