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/**
* @file
* @author 2012-2013 Stefan Radomski (stefan.radomski@cs.tu-darmstadt.de)
* @copyright Simplified BSD
*
* @cond
* This program is free software: you can redistribute it and/or modify
* it under the terms of the FreeBSD license as published by the FreeBSD
* project.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the FreeBSD license along with this
* program. If not, see <http://www.opensource.org/licenses/bsd-license>.
* @endcond
*/
#ifndef TYPEDARRAY_H_99815BLY
#define TYPEDARRAY_H_99815BLY
#include "uscxml/Common.h"
#include "uscxml/Message.h"
#include <string>
#include <vector>
#include <boost/shared_ptr.hpp>
#include <string.h>
#include <inttypes.h>
#include <boost/type_traits.hpp>
#include <boost/static_assert.hpp>
#include <boost/detail/endian.hpp>
#include <stdexcept>
namespace uscxml {
/**
* https://www.khronos.org/registry/typedarray/specs/latest/
*/
class ArrayBuffer {
public:
ArrayBuffer(void* data, unsigned int size);
/**
* Creates a new ArrayBuffer of the given length in bytes. The contents of the
* ArrayBuffer are initialized to 0. If the requested number of bytes could not
* be allocated an exception is raised.
*/
ArrayBuffer(unsigned long length);
ArrayBuffer(boost::shared_ptr<Blob>);
/**
* The length of the ArrayBuffer in bytes, as fixed at construction time.
* Reading this property returns 0 if this ArrayBuffer has been neutered.
*/
unsigned long getByteLength();
/**
* Returns a new ArrayBuffer whose contents are a copy of this ArrayBuffer's
* bytes from begin, inclusive, up to end, exclusive. If either begin or end
* is negative, it refers to an index from the end of the array, as opposed
* to from the beginning.
* If end is unspecified, the new ArrayBuffer contains all bytes from begin
* to the end of this ArrayBuffer.
* The range specified by the begin and end values is clamped to the valid
* index range for the current array. If the computed length of the new
* ArrayBuffer would be negative, it is clamped to zero.
*/
ArrayBuffer slice(long begin, long end);
ArrayBuffer slice(long begin);
static bool isView(void*);
unsigned long getLength() {
return getByteLength();
}
operator bool();
bool operator== (const ArrayBuffer& other) {
return other._buffer == _buffer;
}
// unsigned char get(unsigned long index) {
// if (index >= getLength())
// return 0;
// unsigned char retVal;
// memcpy(&retVal, _buffer->_data + index * sizeof(unsigned char), sizeof(unsigned char));
// return retVal;
// }
//
// void set(unsigned long index, unsigned char value) {
// memcpy(_buffer->_data + index * sizeof(unsigned char), &value, sizeof(unsigned char));
// }
// non-standard extension
std::string md5() {
return _buffer->md5();
}
// non-standard extension
std::string base64() {
return _buffer->base64();
}
std::string getMimeType() {
if (_buffer)
return _buffer->mimeType;
return "";
}
void setMimeType(const std::string& mimeType) {
if (_buffer)
_buffer->mimeType = mimeType;
}
boost::shared_ptr<Blob> _buffer;
};
class ArrayBufferView {
public:
virtual ~ArrayBufferView() {}
/**
* The ArrayBuffer that this ArrayBufferView references.
*/
ArrayBuffer getBuffer();
/**
* The offset of this ArrayBufferView from the start of its ArrayBuffer, in
* bytes, as fixed at construction time. Reading this property returns 0 if
* the referenced ArrayBuffer has been neutered.
*/
virtual unsigned long getByteOffset() = 0;
/**
* The length of the ArrayBufferView in bytes, as fixed at construction time.
* Reading this property returns 0 if the referenced ArrayBuffer has been
* neutered.
*/
virtual unsigned long getByteLength() = 0;
virtual unsigned long getLength() = 0;
protected:
boost::shared_ptr<Blob> _buffer;
unsigned long _start;
unsigned long _end;
};
class DataView : ArrayBufferView {
public:
/**
* Create a new DataView object using the passed ArrayBuffer for its storage.
* Optional byteOffset and byteLength can be used to limit the section of the
* buffer referenced. The byteOffset indicates the offset in bytes from the
* start of the ArrayBuffer, and the byteLength is the number of bytes from the
* offset that this DataView will reference. If both byteOffset and byteLength
* are omitted, the DataView spans the entire ArrayBuffer range. If the
* byteLength is omitted, the DataView extends from the given byteOffset until
* the end of the ArrayBuffer.
* If the given byteOffset and byteLength references an area beyond the end of
* the ArrayBuffer an exception is raised.
*/
DataView(ArrayBuffer*, unsigned long, unsigned long);
DataView(ArrayBuffer*, unsigned long);
DataView(ArrayBuffer*);
unsigned long getByteOffset();
unsigned long getByteLength();
unsigned long getLength();
/**
* Gets the value of the given type at the specified byte offset
* from the start of the view. There is no alignment constraint;
* multi-byte values may be fetched from any offset.
* For multi-byte values, the optional littleEndian argument
* indicates whether a big-endian or little-endian value should be
* read. If false or undefined, a big-endian value is read.
* These methods raise an exception if they would read
* beyond the end of the view.
*/
int8_t getInt8(unsigned long);
uint8_t getUint8(unsigned long);
int16_t getInt16(unsigned long, bool = false);
uint16_t getUint16(unsigned long, bool = false);
int32_t getInt32(unsigned long, bool = false);
uint32_t getUint32(unsigned long, bool = false);
float getFloat32(unsigned long, bool = false);
double getFloat64(unsigned long, bool = false);
/**
* Stores a value of the given type at the specified byte offset
* from the start of the view. There is no alignment constraint;
* multi-byte values may be stored at any offset.
* For multi-byte values, the optional littleEndian argument
* indicates whether the value should be stored in big-endian or
* little-endian byte order. If false or undefined, the value is
* stored in big-endian byte order.
* These methods raise an exception if they would write
* beyond the end of the view.
*/
void setInt8(long, int8_t);
void setUint8(long, uint8_t);
void setInt16(long, int16_t, bool = false);
void setUint16(long, uint16_t, bool = false);
void setInt32(long, int32_t, bool = false);
void setUint32(long, uint32_t, bool = false);
void setFloat32(long, float, bool = false);
void setFloat64(long, double, bool = false);
};
template<class T, class S> class TypedArray : public ArrayBufferView {
public:
virtual ~TypedArray() {}
/**
* Create a new TypedArray object using the passed ArrayBuffer for its storage.
* Optional byteOffset and length can be used to limit the section of the buffer
* referenced. The byteOffset indicates the offset in bytes from the start of
* the ArrayBuffer, and the length is the count of elements from the offset
* that this TypedArray will reference. If both byteOffset and length are
* omitted, the TypedArray spans the entire ArrayBuffer range. If the length
* is omitted, the TypedArray extends from the given byteOffset until the end
* of the ArrayBuffer.
* The given byteOffset must be a multiple of the element size of the specific
* type, otherwise an exception is raised.
* If a given byteOffset and length references an area beyond the end of the
* ArrayBuffer an exception is raised.
* If length is not explicitly specified, the length of the ArrayBuffer minus
* the byteOffset must be a multiple of the element size of the specific type,
* or an exception is raised.
*/
TypedArray(uscxml::ArrayBuffer* buffer, unsigned long byteOffset, unsigned long length) {
if (byteOffset % sizeof(S))
return;
_start = byteOffset / sizeof(S);
_end = _start + length;
if (_end > buffer->_buffer->size / sizeof(S))
return;
_buffer = buffer->_buffer;
}
TypedArray(uscxml::ArrayBuffer* buffer, unsigned long byteOffset) {
if (byteOffset % sizeof(S))
return;
_start = byteOffset / sizeof(S);
_end = buffer->_buffer->size / sizeof(S);
_buffer = buffer->_buffer;
}
TypedArray(uscxml::ArrayBuffer* buffer) {
_start = 0;
_end = (buffer->_buffer->size) / sizeof(S);
_buffer = buffer->_buffer;
}
TypedArray(boost::shared_ptr<Blob> buffer, unsigned long byteOffset, unsigned long length) {
if (byteOffset % sizeof(S))
return;
_start = byteOffset / sizeof(S);
_end = _start + length;
if (_end > buffer->size / sizeof(S))
return;
_buffer = buffer;
}
/**
* Create a new ArrayBuffer with enough bytes to hold length elements of this
* typed array, then creates a typed array view referring to the full buffer.
* As with a directly constructed ArrayBuffer, the contents are initialized
* to 0. If the requested number of bytes could not be allocated an exception
* is raised.
*/
TypedArray(unsigned long length) {
_start = 0;
_end = length;
_buffer = boost::shared_ptr<Blob>(new Blob(length * sizeof(S)));
}
/**
* Create a new ArrayBuffer with enough bytes to hold array.length elements of
* this typed array, then creates a typed array view referring to the full
* buffer. The contents of the new view are initialized to the contents of the
* given array or typed array, with each element converted to the appropriate
* typed array type.
*/
TypedArray(std::vector<T> data) {
_start = 0;
_end = data.size();
_buffer = boost::shared_ptr<Blob>(new Blob(data.size() * sizeof(S)));
set(data, 0);
}
TypedArray(TypedArray* other) {
_start = other->_start;
_end = other->_end;
_buffer = other->_buffer;
}
/**
* This is an index getter.
* Returns the element at the given numeric index.
*/
T get(unsigned long index) {
if (index >= getLength())
return static_cast<T>(0);
S retVal;
memcpy(&retVal, _buffer->data + (_start + index) * sizeof(S), sizeof(S));
return retVal;
}
/**
* This is an index setter.
* Sets the element at the given numeric index to the given value.
*/
void set(unsigned long index, T value) {
memcpy(_buffer->data + (_start + index) * sizeof(S), &value, sizeof(S));
}
/**
* Set multiple values, reading input values from the array.
* The optional offset value indicates the index in the current array where
* values are written. If omitted, it is assumed to be 0.
* If the input array is a TypedArray, the two arrays may use the same
* underlying ArrayBuffer. In this situation, setting the values takes place
* as if all the data is first copied into a temporary buffer that does not
* overlap either of the arrays, and then the data from the temporary buffer
* is copied into the current array.
* If the offset plus the length of the given array is out of range for the
* current TypedArray, an exception is raised.
*/
void set(TypedArray<T, S>* value, unsigned long offset) {
if (!_buffer)
return;
if (offset * sizeof(S) + value->getByteLength() > _buffer->size)
return;
unsigned long otherOffset = value->_start * sizeof(S);
// will this work if we use the same buffer?
memcpy(_buffer->data + (_start + offset) * sizeof(S), value->_buffer->data + otherOffset, value->getByteLength());
}
void set(TypedArray<T, S>* value) {
set(value, 0);
}
/**
* Set multiple values, reading input values from the array.
* The optional offset value indicates the index in the current array where
* values are written. If omitted, it is assumed to be 0.
* If the input array is a TypedArray, the two arrays may use the same
* underlying ArrayBuffer. In this situation, setting the values takes place
* as if all the data is first copied into a temporary buffer that does not
* overlap either of the arrays, and then the data from the temporary buffer
* is copied into the current array.
* If the offset plus the length of the given array is out of range for the
* current TypedArray, an exception is raised.
*/
void set(std::vector<T> data, unsigned long offset) {
if (!_buffer)
return;
if (data.size() + offset > _end)
return;
if (sizeof(T) == sizeof(S)) {
memcpy(_buffer->data + offset, (void*)&data[0], data.size() * sizeof(S));
} else {
S* buffer = (S*)malloc(data.size() * sizeof(S));
typename std::vector<T>::const_iterator dataIter = data.begin();
unsigned long i = 0;
while(dataIter != data.end()) {
buffer[i] = *dataIter;
dataIter++;
i++;
}
memcpy(_buffer->data + offset, buffer, data.size() * sizeof(S));
free (buffer);
}
}
void set(std::vector<T> data) {
set(data, 0);
}
/**
* Returns a new TypedArray view of the ArrayBuffer store for this TypedArray,
* referencing the elements at begin, inclusive, up to end, exclusive. If
* either begin or end is negative, it refers to an index from the end of the
* array, as opposed to from the beginning.
* If end is unspecified, the subarray contains all elements from begin to the
* end of the TypedArray.
* The range specified by the begin and end values is clamped to the valid
* index range for the current array. If the computed length of the new
* TypedArray would be negative, it is clamped to zero.
* The returned TypedArray will be of the same type as the array on which this
* method is invoked.
*/
TypedArray* subarray(long begin, long end) {
if (!_buffer)
return NULL;
unsigned int length = getLength();
unsigned int realBegin = (begin + length) % length;
unsigned int realEnd = (end + length) % length;
if (realEnd == 0)
realEnd = length;
if (realEnd < realBegin)
return NULL;
return new TypedArray<T, S>(_buffer, realBegin * sizeof(S), realEnd - realBegin);
}
TypedArray* subarray(long begin) {
if (!_buffer)
return NULL;
return subarray(begin, getLength());
}
unsigned long getLength() {
if (!_buffer)
return 0;
return _end - _start;
}
unsigned long getByteLength() {
if (!_buffer)
return 0;
return (_end - _start) * sizeof(S);
}
unsigned long getByteOffset() {
if (!_buffer)
return 0;
return _start * sizeof(S);
}
};
/**
* Define actual types as template instances.
* First argument is representation from JavaScript, second type maybe smaller to
* exactly specify the byte width ot the TypedArray.
*/
typedef TypedArray<unsigned char, uint8_t> Uint8Array;
typedef TypedArray<unsigned char, uint8_t> Uint8ClampedArray;
typedef TypedArray<char, int8_t> Int8Array;
typedef TypedArray<short, int16_t> Int16Array;
typedef TypedArray<unsigned short, uint16_t> Uint16Array;
typedef TypedArray<long, int32_t> Int32Array;
typedef TypedArray<unsigned long, uint32_t> Uint32Array;
typedef TypedArray<float, float> Float32Array;
typedef TypedArray<double, double> Float64Array;
// see http://www.cplusplus.com/forum/general/27544/
// Little-endian operating systems:
//---------------------------------
// Linux on x86, x64, Alpha and Itanium
// Mac OS on x86, x64
// Solaris on x86, x64, PowerPC
// Tru64 on Alpha
// Windows on x86, x64 and Itanium
// Big-endian operating systems:
//------------------------------
// AIX on POWER
// AmigaOS on PowerPC and 680x0
// HP-UX on Itanium and PA-RISC
// Linux on MIPS, SPARC, PA-RISC, POWER, PowerPC, and 680x0
// Mac OS on PowerPC and 680x0
// Solaris on SPARC
enum endianness {
little_endian,
big_endian,
network_endian = big_endian,
#if defined(BOOST_LITTLE_ENDIAN)
host_endian = little_endian
#elif defined(BOOST_BIG_ENDIAN)
host_endian = big_endian
#else
#error "unable to determine system endianness"
#endif
};
namespace detail {
template<typename T, size_t sz>
struct swap_bytes {
inline T operator()(T val) {
throw std::out_of_range("data size");
}
};
template<typename T>
struct swap_bytes<T, 1> {
inline T operator()(T val) {
return val;
}
};
template<typename T>
struct swap_bytes<T, 2> { // for 16 bit
inline T operator()(T val) {
return ((((val) >> 8) & 0xff) | (((val) & 0xff) << 8));
}
};
template<typename T>
struct swap_bytes<T, 4> { // for 32 bit
inline T operator()(T val) {
#if defined(_USE_BUILTIN_BSWAPS) && defined(__GNUC__) && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4)
return __builtin_bswap32(val);
#else
return ((((val) & 0xff000000) >> 24) |
(((val) & 0x00ff0000) >> 8) |
(((val) & 0x0000ff00) << 8) |
(((val) & 0x000000ff) << 24));
#endif
}
};
template<>
struct swap_bytes<float, 4> {
inline float operator()(float val) {
uint32_t mem = swap_bytes<uint32_t, sizeof(uint32_t)>()(*(uint32_t*)&val);
return *(float*)&mem;
}
};
template<typename T>
struct swap_bytes<T, 8> { // for 64 bit
inline T operator()(T val) {
#if defined(_USE_BUILTIN_BSWAPS) && defined(__GNUC__) && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4)
return __builtin_bswap64(val);
#else
return ((((val) & 0xff00000000000000ull) >> 56) |
(((val) & 0x00ff000000000000ull) >> 40) |
(((val) & 0x0000ff0000000000ull) >> 24) |
(((val) & 0x000000ff00000000ull) >> 8 ) |
(((val) & 0x00000000ff000000ull) << 8 ) |
(((val) & 0x0000000000ff0000ull) << 24) |
(((val) & 0x000000000000ff00ull) << 40) |
(((val) & 0x00000000000000ffull) << 56));
#endif
}
};
template<>
struct swap_bytes<double, 8> {
inline double operator()(double val) {
uint64_t mem = swap_bytes<uint64_t, sizeof(uint64_t)>()(*(uint64_t*)&val);
return *(double*)&mem;
}
};
template<endianness from, endianness to, class T>
struct do_byte_swap {
inline T operator()(T value) {
return swap_bytes<T, sizeof(T)>()(value);
}
};
// specialisations when attempting to swap to the same endianess
template<class T> struct do_byte_swap<little_endian, little_endian, T> {
inline T operator()(T value) {
return value;
}
};
template<class T> struct do_byte_swap<big_endian, big_endian, T> {
inline T operator()(T value) {
return value;
}
};
} // namespace detail
template<endianness from, endianness to, class T>
inline T byte_swap(T value) {
// ensure the data is only 1, 2, 4 or 8 bytes
BOOST_STATIC_ASSERT(sizeof(T) == 1 || sizeof(T) == 2 || sizeof(T) == 4 || sizeof(T) == 8);
// ensure we're only swapping arithmetic types
BOOST_STATIC_ASSERT(boost::is_arithmetic<T>::value);
return detail::do_byte_swap<from, to, T>()(value);
}
}
#endif /* end of include guard: TYPEDARRAY_H_99815BLY */
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