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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2012-2016 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2014-2016 Intel, Inc. All rights reserved.
* Copyright (c) 2014-2016 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2016 Mellanox Technologies, Inc.
* All rights reserved.
* Copyright (c) 2020-2021 Triad National Security, LLC. All rights reserved.
*
* Copyright (c) 2021 Nanook Consulting. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*
*/
/* This code was taken from Open MPI project, file
opal/mca/pmix/base/pmix_base_fns.c
*/
#include "test_common.h"
#include <assert.h>
#include <string.h>
/* base64 encoding with illegal characters removed ('=' is replaced by ' ') */
static inline unsigned char pmixt_base64_encsym(unsigned char value)
{
if (value >= 64) {
TEST_ERROR(("Unknown value passed to encoding function, exiting."));
exit(1);
}
if (value < 26) {
return 'A' + value;
} else if (value < 52) {
return 'a' + (value - 26);
} else if (value < 62) {
return '0' + (value - 52);
}
return (62 == value) ? '+' : '/';
}
static inline unsigned char pmixt_base64_decsym(unsigned char value)
{
if ('+' == value) {
return 62;
} else if ('/' == value) {
return 63;
} else if (' ' == value) {
return 64;
} else if (value <= '9') {
return (value - '0') + 52;
} else if (value <= 'Z') {
return (value - 'A');
} else if (value <= 'z') {
return (value - 'a') + 26;
}
return 64;
}
static inline void pmixt_base64_encode_block(const unsigned char in[3], char out[4], int len)
{
out[0] = pmixt_base64_encsym(in[0] >> 2);
// len is the length of in[] - we need to make sure we don't reference uninitialized data, hence
// the conditionals
out[1] = 1 < len ? pmixt_base64_encsym(((in[0] & 0x03) << 4) | ((in[1] & 0xf0) >> 4))
: pmixt_base64_encsym((in[0] & 0x03) << 4);
out[2] = 1 < len ? pmixt_base64_encsym((in[1] & 0x0f) << 2) : ' ';
out[2] = 2 < len ? pmixt_base64_encsym(((in[1] & 0x0f) << 2) | ((in[2] & 0xc0) >> 6)) : out[2];
out[3] = 2 < len ? pmixt_base64_encsym(in[2] & 0x3f) : ' ';
}
static inline int pmixt_base64_decode_block(const char in[4], unsigned char out[3])
{
char in_dec[4];
in_dec[0] = pmixt_base64_decsym(in[0]);
in_dec[1] = pmixt_base64_decsym(in[1]);
in_dec[2] = pmixt_base64_decsym(in[2]);
in_dec[3] = pmixt_base64_decsym(in[3]);
out[0] = in_dec[0] << 2 | in_dec[1] >> 4;
if (64 == in_dec[2]) {
return 1;
}
out[1] = in_dec[1] << 4 | in_dec[2] >> 2;
if (64 == in_dec[3]) {
return 2;
}
out[2] = ((in_dec[2] << 6) & 0xc0) | in_dec[3];
return 3;
}
char *pmixt_encode(const void *val, size_t vallen)
{
char *outdata, *tmp;
size_t i, outlen;
outlen = ((2 + vallen) * 4) / 3 + 2;
outdata = calloc(outlen, 1);
if (NULL == outdata) {
return NULL;
}
for (i = 0, tmp = outdata; i < vallen; i += 3, tmp += 4) {
pmixt_base64_encode_block((unsigned char *) val + i, tmp, vallen - i);
}
tmp[0] = (unsigned char) '\0';
// TEST_VERBOSE(("vallen = %ld, outlen = %ld", vallen, outlen));
return outdata;
}
ssize_t pmixt_decode(const char *data, void *decdata, size_t buffsz)
{
size_t input_len = strlen(data) / 4;
int out_len;
size_t i;
for (i = 0, out_len = 0; i < input_len; i++, data += 4) {
// check against size of buffer to make sure we don't overrun
if (buffsz - out_len >= 1) {
out_len += pmixt_base64_decode_block(data, ((unsigned char *)(decdata) + (3 * i)) );
} else {
assert((buffsz - out_len) >= 1);
exit(1);
}
}
return out_len;
}
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