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/*=========================================================================
Program: Visualization Toolkit
Module: vtkBase64Utilities.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkBase64Utilities.h"
#include "vtkObjectFactory.h"
#include <cassert>
//----------------------------------------------------------------------------
vtkStandardNewMacro(vtkBase64Utilities);
//----------------------------------------------------------------------------
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;
}
#if !defined(VTK_LEGACY_REMOVE)
//----------------------------------------------------------------------------
unsigned long vtkBase64Utilities::Decode(const unsigned char *input,
unsigned long length,
unsigned char *output,
unsigned long max_input_length)
{
VTK_LEGACY_REPLACED_BODY(Decode, "VTK 7.1", DecodeSafely);
const unsigned char *ptr = input;
unsigned char *optr = output;
// Decode complete triplet
if (max_input_length)
{
const unsigned char *end = input + max_input_length;
while (ptr < end)
{
int len =
vtkBase64Utilities::DecodeTriplet(ptr[0], ptr[1], ptr[2], ptr[3],
&optr[0], &optr[1], &optr[2]);
optr += len;
if(len < 3)
{
return optr - output;
}
ptr += 4;
}
}
else
{
unsigned char *oend = output + length;
while ((oend - optr) >= 3)
{
int len =
vtkBase64Utilities::DecodeTriplet(ptr[0], ptr[1], ptr[2], ptr[3],
&optr[0], &optr[1], &optr[2]);
optr += len;
if(len < 3)
{
return optr - output;
}
ptr += 4;
}
// Decode the last triplet
unsigned char temp;
if (oend - optr == 2)
{
int len =
vtkBase64Utilities::DecodeTriplet(ptr[0], ptr[1], ptr[2], ptr[3],
&optr[0], &optr[1], &temp);
optr += (len > 2 ? 2 : len);
}
else if (oend - optr == 1)
{
unsigned char temp2;
int len =
vtkBase64Utilities::DecodeTriplet(ptr[0], ptr[1], ptr[2], ptr[3],
&optr[0], &temp, &temp2);
optr += (len > 2 ? 2 : len);
}
}
return optr - output;
}
#endif
//----------------------------------------------------------------------------
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;
}
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