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Base64.cxx
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238 lines (189 loc) · 4.35 KB
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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
#include "Base64.h"
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <cassert>
namespace o2::framework::internal
{
static char encoder[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static char decoder[256];
static int initialized;
static void
base64_init_decoder()
{
int i = 0;
if (initialized) {
return;
}
// -1 is used for error detection
memset(decoder, -1, sizeof decoder);
for (; i < 64; decoder[(int)encoder[i]] = i, ++i) {
}
initialized = 1;
return;
}
static int
base64_encsize(int size)
{
return 4 * ((size + 2) / 3);
}
int base64_encode(char* dest, int size, unsigned char* src, int slen)
{
int dlen, i, j;
uint32_t a, b, c, triple;
dlen = base64_encsize(slen);
// Sanity checks
if (src == nullptr || dest == nullptr) {
return -1;
}
if (dlen + 1 > size) {
return -1;
}
if (slen == 0) {
if (size > 0) {
dest[0] = 0;
return 0;
}
return -1;
}
for (i = 0, j = 0; i < slen;) {
a = src[i++];
// b and c may be off limit
b = i < slen ? src[i++] : 0;
c = i < slen ? src[i++] : 0;
triple = (a << 16) + (b << 8) + c;
dest[j++] = encoder[(triple >> 18) & 0x3F];
dest[j++] = encoder[(triple >> 12) & 0x3F];
dest[j++] = encoder[(triple >> 6) & 0x3F];
dest[j++] = encoder[triple & 0x3F];
}
// Pad zeroes at the end
switch (slen % 3) {
case 1:
dest[j - 2] = '=';
case 2:
dest[j - 1] = '=';
}
// Always add \0
dest[j] = 0;
return dlen;
}
char* base64_enc_malloc(unsigned char* src, int slen)
{
int size;
char* buffer;
size = base64_encsize(slen) + 1;
buffer = (char*)malloc(size);
if (buffer == nullptr) {
return nullptr;
}
size = base64_encode(buffer, size, src, slen);
if (size == -1) {
free(buffer);
return nullptr;
}
return buffer;
}
static int
base64_decsize(char* src)
{
int slen, size, i;
if (src == nullptr) {
return 0;
}
slen = strlen(src);
size = slen / 4 * 3;
// Count pad chars
for (i = 0; src[slen - i - 1] == '='; ++i) {
}
// Remove at most 2 bytes.
return size - (i >= 2 ? 2 : i);
}
int base64_decode(unsigned char* dest, int size, char* src)
{
int slen, dlen, padlen, i, j;
uint32_t a, b, c, d, triple;
// Initialize decoder
base64_init_decoder();
// Sanity checks
if (src == nullptr || dest == nullptr) {
return -1;
}
slen = strlen(src);
if (slen == 0) {
if (size > 0) {
dest[0] = 0;
return 0;
}
return -1;
}
// Remove trailing pad characters.
for (padlen = 0; src[slen - padlen - 1] == '='; ++padlen) {
}
if (padlen > 2) {
slen -= padlen - 2;
}
if (slen % 4) {
return -1;
}
dlen = base64_decsize(src);
// Check buffer size
if (dlen + 1 > size) {
return -1;
}
for (i = 0, j = 0; i < slen;) {
a = decoder[(int)src[i++]];
b = decoder[(int)src[i++]];
c = decoder[(int)src[i++]];
d = decoder[(int)src[i++]];
// Sextet 3 and 4 may be zero at the end
if (i == slen) {
if (src[slen - 1] == '=') {
d = 0;
if (src[slen - 2] == '=') {
c = 0;
}
}
}
// Non-Base64 char
if (a == -1 || b == -1 || c == -1 || d == -1) {
return -1;
}
triple = (a << 18) + (b << 12) + (c << 6) + d;
dest[j++] = (triple >> 16) & 0xFF;
dest[j++] = (triple >> 8) & 0xFF;
dest[j++] = triple & 0xFF;
}
// Always add \0
dest[j] = 0;
return dlen;
}
unsigned char*
base64_dec_malloc(char* src)
{
int size;
unsigned char* buffer;
size = base64_decsize(src) + 1;
buffer = (unsigned char*)malloc(size);
if (buffer == nullptr) {
return nullptr;
}
size = base64_decode(buffer, size, src);
if (size == -1) {
free(buffer);
return nullptr;
}
return buffer;
}
} // namespace o2::framework::internal