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98 lines
3.5 KiB
C
98 lines
3.5 KiB
C
3 weeks ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkBase64Utilities.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkBase64Utilities
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* @brief base64 encode and decode utilities.
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*
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* vtkBase64Utilities implements base64 encoding and decoding.
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*/
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#ifndef vtkBase64Utilities_h
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#define vtkBase64Utilities_h
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#include "vtkIOCoreModule.h" // For export macro
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#include "vtkObject.h"
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class VTKIOCORE_EXPORT vtkBase64Utilities : public vtkObject
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{
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public:
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static vtkBase64Utilities* New();
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vtkTypeMacro(vtkBase64Utilities, vtkObject);
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/**
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* Encode 3 bytes into 4 bytes
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*/
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static void EncodeTriplet(unsigned char i0, unsigned char i1, unsigned char i2, unsigned char* o0,
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unsigned char* o1, unsigned char* o2, unsigned char* o3);
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/**
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* Encode 2 bytes into 4 bytes
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*/
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static void EncodePair(unsigned char i0, unsigned char i1, unsigned char* o0, unsigned char* o1,
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unsigned char* o2, unsigned char* o3);
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/**
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* Encode 1 byte into 4 bytes
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*/
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static void EncodeSingle(
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unsigned char i0, unsigned char* o0, unsigned char* o1, unsigned char* o2, unsigned char* o3);
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/**
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* Encode 'length' bytes from the input buffer and store the
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* encoded stream into the output buffer. Return the length of
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* the encoded stream. Note that the output buffer must be allocated
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* by the caller (length * 1.5 should be a safe estimate).
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* If 'mark_end' is true then an extra set of 4 bytes is added
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* to the end of the stream if the input is a multiple of 3 bytes.
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* These bytes are invalid chars and therefore they will stop the decoder
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* thus enabling the caller to decode a stream without actually knowing
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* how much data to expect (if the input is not a multiple of 3 bytes then
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* the extra padding needed to complete the encode 4 bytes will stop the
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* decoding anyway).
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*/
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static unsigned long Encode(
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const unsigned char* input, unsigned long length, unsigned char* output, int mark_end = 0);
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/**
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* Decode 4 bytes into 3 bytes.
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* Return the number of bytes actually decoded (0 to 3, inclusive).
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*/
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static int DecodeTriplet(unsigned char i0, unsigned char i1, unsigned char i2, unsigned char i3,
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unsigned char* o0, unsigned char* o1, unsigned char* o2);
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/**
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* Decode 4 bytes at a time from the input buffer and store the decoded
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* stream into the output buffer. The required output buffer size must be
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* determined and allocated by the caller. The needed output space is
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* always less than the input buffer size, so a good first order
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* approximation is to allocate the same size. Base64 encoding is about
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* 4/3 overhead, so a tighter bound is possible.
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* Return the number of bytes atually placed into the output buffer.
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*/
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static size_t DecodeSafely(
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const unsigned char* input, size_t inputLen, unsigned char* output, size_t outputLen);
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protected:
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vtkBase64Utilities() {}
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~vtkBase64Utilities() override {}
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private:
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vtkBase64Utilities(const vtkBase64Utilities&) = delete;
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void operator=(const vtkBase64Utilities&) = delete;
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};
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#endif
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// VTK-HeaderTest-Exclude: vtkBase64Utilities.h
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