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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkBase64Utilities.h"
#include "vtkObjectFactory.h"
#include <cassert>
//------------------------------------------------------------------------------
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkBase64Utilities);
//------------------------------------------------------------------------------
void vtkBase64Utilities::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
//------------------------------------------------------------------------------
static const unsigned char vtkBase64UtilitiesEncodeTable[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
//------------------------------------------------------------------------------
inline static unsigned char vtkBase64UtilitiesEncodeChar(unsigned char c)
{
assert(c < 65);
return vtkBase64UtilitiesEncodeTable[c];
}
//------------------------------------------------------------------------------
void vtkBase64Utilities::EncodeTriplet(unsigned char i0, unsigned char i1, unsigned char i2,
unsigned char* o0, unsigned char* o1, unsigned char* o2, unsigned char* o3)
{
*o0 = vtkBase64UtilitiesEncodeChar((i0 >> 2) & 0x3F);
*o1 = vtkBase64UtilitiesEncodeChar(((i0 << 4) & 0x30) | ((i1 >> 4) & 0x0F));
*o2 = vtkBase64UtilitiesEncodeChar(((i1 << 2) & 0x3C) | ((i2 >> 6) & 0x03));
*o3 = vtkBase64UtilitiesEncodeChar(i2 & 0x3F);
}
//------------------------------------------------------------------------------
void vtkBase64Utilities::EncodePair(unsigned char i0, unsigned char i1, unsigned char* o0,
unsigned char* o1, unsigned char* o2, unsigned char* o3)
{
*o0 = vtkBase64UtilitiesEncodeChar((i0 >> 2) & 0x3F);
*o1 = vtkBase64UtilitiesEncodeChar(((i0 << 4) & 0x30) | ((i1 >> 4) & 0x0F));
*o2 = vtkBase64UtilitiesEncodeChar(((i1 << 2) & 0x3C));
*o3 = '=';
}
//------------------------------------------------------------------------------
void vtkBase64Utilities::EncodeSingle(
unsigned char i0, unsigned char* o0, unsigned char* o1, unsigned char* o2, unsigned char* o3)
{
*o0 = vtkBase64UtilitiesEncodeChar((i0 >> 2) & 0x3F);
*o1 = vtkBase64UtilitiesEncodeChar(((i0 << 4) & 0x30));
*o2 = '=';
*o3 = '=';
}
//------------------------------------------------------------------------------
unsigned long vtkBase64Utilities::Encode(
const unsigned char* input, unsigned long length, unsigned char* output, int mark_end)
{
const unsigned char* ptr = input;
const unsigned char* end = input + length;
unsigned char* optr = output;
// Encode complete triplet
while ((end - ptr) >= 3)
{
vtkBase64Utilities::EncodeTriplet(
ptr[0], ptr[1], ptr[2], &optr[0], &optr[1], &optr[2], &optr[3]);
ptr += 3;
optr += 4;
}
// Encodes a 2-byte ending into 3 bytes and 1 pad byte and writes.
if (end - ptr == 2)
{
vtkBase64Utilities::EncodePair(ptr[0], ptr[1], &optr[0], &optr[1], &optr[2], &optr[3]);
optr += 4;
}
// Encodes a 1-byte ending into 2 bytes and 2 pad bytes
else if (end - ptr == 1)
{
vtkBase64Utilities::EncodeSingle(ptr[0], &optr[0], &optr[1], &optr[2], &optr[3]);
optr += 4;
}
// Do we need to mark the end
else if (mark_end)
{
optr[0] = optr[1] = optr[2] = optr[3] = '=';
optr += 4;
}
return optr - output;
}
//------------------------------------------------------------------------------
static const unsigned char vtkBase64UtilitiesDecodeTable[256] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0x3E, 0xFF, 0xFF, 0xFF, 0x3F, //
0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, //
0x3C, 0x3D, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF, //
0xFF, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, //
0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, //
0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, //
0x17, 0x18, 0x19, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, //
0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, //
0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30, //
0x31, 0x32, 0x33, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
//-------------------------------------
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, //
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF //
};
//------------------------------------------------------------------------------
inline static unsigned char vtkBase64UtilitiesDecodeChar(unsigned char c)
{
return vtkBase64UtilitiesDecodeTable[c];
}
//------------------------------------------------------------------------------
int vtkBase64Utilities::DecodeTriplet(unsigned char i0, unsigned char i1, unsigned char i2,
unsigned char i3, unsigned char* o0, unsigned char* o1, unsigned char* o2)
{
unsigned char d0, d1, d2, d3;
d0 = vtkBase64UtilitiesDecodeChar(i0);
d1 = vtkBase64UtilitiesDecodeChar(i1);
d2 = vtkBase64UtilitiesDecodeChar(i2);
d3 = vtkBase64UtilitiesDecodeChar(i3);
// Make sure all characters were valid
if (d0 == 0xFF || d1 == 0xFF || d2 == 0xFF || d3 == 0xFF)
{
return 0;
}
// Decode the 3 bytes
*o0 = ((d0 << 2) & 0xFC) | ((d1 >> 4) & 0x03);
*o1 = ((d1 << 4) & 0xF0) | ((d2 >> 2) & 0x0F);
*o2 = ((d2 << 6) & 0xC0) | ((d3 >> 0) & 0x3F);
// Return the number of bytes actually decoded
if (i2 == '=')
{
return 1;
}
if (i3 == '=')
{
return 2;
}
return 3;
}
//------------------------------------------------------------------------------
size_t vtkBase64Utilities::DecodeSafely(
const unsigned char* input, size_t inputLen, unsigned char* output, size_t outputLen)
{
assert(input);
assert(output);
// Nonsense small input or no space for any output
if ((inputLen < 4) || (outputLen == 0))
{
return 0;
}
// Consume 4 ASCII chars of input at a time, until less than 4 left
size_t inIdx = 0, outIdx = 0;
while (inIdx <= inputLen - 4)
{
// Decode 4 ASCII characters into 0, 1, 2, or 3 bytes
unsigned char o0, o1, o2;
int bytesDecoded = vtkBase64Utilities::DecodeTriplet(
input[inIdx + 0], input[inIdx + 1], input[inIdx + 2], input[inIdx + 3], &o0, &o1, &o2);
assert((bytesDecoded >= 0) && (bytesDecoded <= 3));
if ((bytesDecoded >= 1) && (outIdx < outputLen))
{
output[outIdx++] = o0;
}
if ((bytesDecoded >= 2) && (outIdx < outputLen))
{
output[outIdx++] = o1;
}
if ((bytesDecoded >= 3) && (outIdx < outputLen))
{
output[outIdx++] = o2;
}
// If fewer than 3 bytes resulted from decoding (in this pass),
// then the input stream has nothing else decodable, so end.
if (bytesDecoded < 3)
{
return outIdx;
}
// Consumed a whole 4 of input and got 3 bytes of output, continue
inIdx += 4;
assert(bytesDecoded == 3);
}
return outIdx;
}
VTK_ABI_NAMESPACE_END
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