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random access byteBuffer

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This commit is contained in:
Matej Sekoranja
2011-01-01 21:25:23 +01:00
parent b5cc749a94
commit 3f9852bd58
3 changed files with 349 additions and 32 deletions
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145
pvDataApp/misc/byteBuffer.cpp
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@@ -22,11 +22,10 @@ namespace epics {
_bufferByteOrder(byteOrder), _size(size), _position(0),
_limit(size), _buffer(0) {
if (size < 0)
throw EpicsException("negative size");
if(size<0) throw EpicsException("negative size");
if (byteOrder!=EPICS_ENDIAN_BIG && byteOrder!=EPICS_ENDIAN_LITTLE)
throw EpicsException("invalid endian");
throw EpicsException("invalid endianness");
_buffer = new char[_size];
}
@@ -53,17 +52,25 @@ namespace epics {
}
bool ByteBuffer::getBoolean() {
if(_position<_limit)
return _buffer[_position++]==0 ? false : true;
return getBoolean(_position++);
}
bool ByteBuffer::getBoolean(int index) {
if(index>=0&&index<_limit)
return _buffer[index]==0 ? false : true;
else
throw EpicsException("buffer underflow");
throw EpicsException("index out of bounds");
}
int8 ByteBuffer::getByte() {
if(_position<_limit)
return (int8)_buffer[_position++];
return getByte(_position++);
}
int8 ByteBuffer::getByte(int index) {
if(index>=0&&index<_limit)
return (int8)_buffer[index];
else
throw EpicsException("buffer underflow");
throw EpicsException("index out of bounds");
}
int16 ByteBuffer::getShort() {
@@ -74,6 +81,15 @@ namespace epics {
return val;
}
int16 ByteBuffer::getShort(int index) {
if(index<0||_limit-index<(int)sizeof(int16))
throw EpicsException("index out of bounds");
int16 val;
getWithEndianness(index, (char*)&val, sizeof(int16)); // store short into val
return val;
}
int32 ByteBuffer::getInt() {
if(_limit-_position<(int)sizeof(int32))
throw EpicsException("buffer underflow");
@@ -82,6 +98,14 @@ namespace epics {
return val;
}
int32 ByteBuffer::getInt(int index) {
if(index<0||_limit-index<(int)sizeof(int32))
throw EpicsException("index out of bounds");
int32 val;
getWithEndianness(index, (char*)&val, sizeof(int32)); // store int into val
return val;
}
int64 ByteBuffer::getLong() {
if(_limit-_position<(int)sizeof(int64))
throw EpicsException("buffer underflow");
@@ -90,6 +114,14 @@ namespace epics {
return val;
}
int64 ByteBuffer::getLong(int index) {
if(index<0||_limit-index<(int)sizeof(int64))
throw EpicsException("index out of bounds");
int64 val;
getWithEndianness(index, (char*)&val, sizeof(int64)); // store long into val
return val;
}
float ByteBuffer::getFloat() {
if(_limit-_position<(int)sizeof(float))
throw EpicsException("buffer underflow");
@@ -98,6 +130,14 @@ namespace epics {
return val;
}
float ByteBuffer::getFloat(int index) {
if(index<0||_limit-index<(int)sizeof(float))
throw EpicsException("index out of bounds");
float val;
getWithEndianness(index, (char*)&val, sizeof(float)); // store float into val
return val;
}
double ByteBuffer::getDouble() {
if(_limit-_position<(int)sizeof(double))
throw EpicsException("buffer underflow");
@@ -106,6 +146,14 @@ namespace epics {
return val;
}
double ByteBuffer::getDouble(int index) {
if(index>=0&&_limit-index<(int)sizeof(double)) throw EpicsException(
"index out of bounds");
double val;
getWithEndianness(index, (char*)&val, sizeof(double)); // store double into val
return val;
}
void ByteBuffer::get(char* dst, int offset, int count) {
if(count>getRemaining()) throw EpicsException("buffer underflow");
for(int i = 0; i<count; i++)
@@ -120,18 +168,22 @@ namespace epics {
}
ByteBuffer* ByteBuffer::putBoolean(bool value) {
if(_position<_limit)
_buffer[_position++] = value ? 1 : 0;
else
throw EpicsException("buffer overflow");
return this;
return putByte(_position++, value ? 1 : 0);
}
ByteBuffer* ByteBuffer::putBoolean(int index, bool value) {
return putByte(index, value ? 1 : 0);
}
ByteBuffer* ByteBuffer::putByte(int8 value) {
if(_position<_limit)
_buffer[_position++] = (char)value;
return putByte(_position++, value);
}
ByteBuffer* ByteBuffer::putByte(int index, int8 value) {
if(index>=0&&index<_limit)
_buffer[index] = (char)value;
else
throw EpicsException("buffer overflow");
throw EpicsException("index out of bounds");
return this;
}
@@ -142,6 +194,13 @@ namespace epics {
return this;
}
ByteBuffer* ByteBuffer::putShort(int index, int16 value) {
if(index<0||_limit-index<(int)sizeof(int16))
throw EpicsException("index out of bounds");
putWithEndianness(index, (char*)&value, sizeof(int16)); // store short into buffer
return this;
}
ByteBuffer* ByteBuffer::putInt(int32 value) {
if(_limit-_position<(int)sizeof(int32))
throw EpicsException("buffer overflow");
@@ -149,6 +208,13 @@ namespace epics {
return this;
}
ByteBuffer* ByteBuffer::putInt(int index, int32 value) {
if(index<0||_limit-index<(int)sizeof(int32))
throw EpicsException("index out of bounds");
putWithEndianness(index, (char*)&value, sizeof(int32)); // store int into buffer
return this;
}
ByteBuffer* ByteBuffer::putLong(int64 value) {
if(_limit-_position<(int)sizeof(int64))
throw EpicsException("buffer overflow");
@@ -156,6 +222,13 @@ namespace epics {
return this;
}
ByteBuffer* ByteBuffer::putLong(int index, int64 value) {
if(index<0||_limit-index<(int)sizeof(int64))
throw EpicsException("index out of bounds");
putWithEndianness(index, (char*)&value, sizeof(int64)); // store long into buffer
return this;
}
ByteBuffer* ByteBuffer::putFloat(float value) {
if(_limit-_position<(int)sizeof(float))
throw EpicsException("buffer overflow");
@@ -163,6 +236,13 @@ namespace epics {
return this;
}
ByteBuffer* ByteBuffer::putFloat(int index, float value) {
if(index<0||_limit-index<(int)sizeof(float))
throw EpicsException("index out of bounds");
putWithEndianness(index, (char*)&value, sizeof(float)); // store float into buffer
return this;
}
ByteBuffer* ByteBuffer::putDouble(double value) {
if(_limit-_position<(int)sizeof(double))
throw EpicsException("buffer overflow");
@@ -170,6 +250,13 @@ namespace epics {
return this;
}
ByteBuffer* ByteBuffer::putDouble(int index, double value) {
if(index<0||_limit-index<(int)sizeof(double))
throw EpicsException("index out of bounds");
putWithEndianness(index, (char*)&value, sizeof(double)); // store double into buffer
return this;
}
/**
* Buffer underflow or overflow checks are performed in the caller.
*/
@@ -194,5 +281,29 @@ namespace epics {
_buffer[_position++] = src[i];
}
/**
* Buffer underflow or overflow checks are performed in the caller.
*/
void ByteBuffer::putWithEndianness(int index, char* src, size_t size) {
if(_bufferByteOrder==EPICS_BYTE_ORDER)
for(size_t i = 0; i<size; i++)
_buffer[index++] = src[i];
else
for(int i = (int)size-1; i>=0; i--)
_buffer[index++] = src[i];
}
/**
* Buffer underflow or overflow checks are performed in the caller.
*/
void ByteBuffer::getWithEndianness(int index, char* dest, size_t size) {
if(_bufferByteOrder==EPICS_BYTE_ORDER)
for(size_t i = 0; i<size; i++)
dest[i] = _buffer[index++];
else
for(int i = (int)size-1; i>=0; i--)
dest[i] = _buffer[index++];
}
}
}