automatically resized byte buffer More...
#include "buffer.h"
Classes | |
struct | Data |
This data structure is variable-sized through its last member whose size is determined at allocation time and stored in the m_size field. More... | |
class | Iterator |
iterator in a Buffer instance More... | |
struct | LocalStaticDestructor |
Local static destructor structure. More... | |
Public Member Functions | |
Buffer () | |
Buffer (const Buffer &o) | |
Copy constructor. | |
Buffer (uint32_t dataSize) | |
Constructor. | |
Buffer (uint32_t dataSize, bool initialize) | |
Constructor. | |
~Buffer () | |
void | AddAtEnd (const Buffer &o) |
void | AddAtEnd (uint32_t end) |
void | AddAtStart (uint32_t start) |
Buffer::Iterator | Begin () const |
void | CopyData (std::ostream *os, uint32_t size) const |
Copy the specified amount of data from the buffer to the given output stream. | |
uint32_t | CopyData (uint8_t *buffer, uint32_t size) const |
Copy the specified amount of data from the buffer to the given buffer. | |
Buffer | CreateFragment (uint32_t start, uint32_t length) const |
uint32_t | Deserialize (const uint8_t *buffer, uint32_t size) |
Buffer::Iterator | End () const |
uint32_t | GetSerializedSize () const |
Return the number of bytes required for serialization. | |
uint32_t | GetSize () const |
Buffer & | operator= (const Buffer &o) |
Assignment operator. | |
const uint8_t * | PeekData () const |
void | RemoveAtEnd (uint32_t end) |
void | RemoveAtStart (uint32_t start) |
uint32_t | Serialize (uint8_t *buffer, uint32_t maxSize) const |
Private Types | |
typedef std::vector< Buffer::Data * > | FreeList |
Container for buffer data. | |
Private Member Functions | |
bool | CheckInternalState () const |
Checks the internal buffer structures consistency. | |
Buffer | CreateFullCopy () const |
Create a full copy of the buffer, including all the internal structures. | |
uint32_t | GetInternalEnd () const |
Get the buffer end position. | |
uint32_t | GetInternalSize () const |
Get the buffer real size. | |
void | Initialize (uint32_t zeroSize) |
Initializes the buffer with a number of zeroes. | |
void | TransformIntoRealBuffer () const |
Transform a "Virtual byte buffer" into a "Real byte buffer". | |
Static Private Member Functions | |
static Buffer::Data * | Allocate (uint32_t reqSize) |
Allocate a buffer data storage. | |
static Buffer::Data * | Create (uint32_t size) |
Create a buffer data storage. | |
static void | Deallocate (Buffer::Data *data) |
Deallocate the buffer memory. | |
static void | Recycle (Buffer::Data *data) |
Recycle the buffer memory. | |
Private Attributes | |
Data * | m_data |
the buffer data storage | |
uint32_t | m_end |
offset to the end of the data referenced by this Buffer instance from the start of m_data->m_data | |
uint32_t | m_maxZeroAreaStart |
keep track of the maximum value of m_zeroAreaStart across the lifetime of a Buffer instance. | |
uint32_t | m_start |
offset to the start of the data referenced by this Buffer instance from the start of m_data->m_data | |
uint32_t | m_zeroAreaEnd |
offset to the end of the virtual zero area from the start of m_data->m_data | |
uint32_t | m_zeroAreaStart |
offset to the start of the virtual zero area from the start of m_data->m_data | |
Static Private Attributes | |
static FreeList * | g_freeList = nullptr |
Buffer data container. | |
static LocalStaticDestructor | g_localStaticDestructor |
Local static destructor. | |
static uint32_t | g_maxSize = 0 |
Max observed data size. | |
static uint32_t | g_recommendedStart = 0 |
location in a newly-allocated buffer where you should start writing data. | |
automatically resized byte buffer
This represents a buffer of bytes. Its size is automatically adjusted to hold any data prepended or appended by the user. Its implementation is optimized to ensure that the number of buffer resizes is minimized, by creating new Buffers of the maximum size ever used. The correct maximum size is learned at runtime during use by recording the maximum size of each packet.
When multiple Buffer instances hold a reference to the same underlying BufferData object, they must be able to detect when the operation they want to perform should trigger a copy of the BufferData. If the BufferData::m_count field is one, it means that there exist only one instance of Buffer which references the BufferData instance so, it is safe to modify it. It is also safe to modify the content of a BufferData if the modification falls outside of the "dirty area" defined by the BufferData. In every other case, the BufferData must be copied before being modified.
To understand the way the Buffer::Add and Buffer::Remove methods work, you first need to understand the "virtual offsets" used to keep track of the content of buffers. Each Buffer instance contains real data bytes in its BufferData instance but it also contains "virtual zero data" which typically is used to represent application-level payload. No memory is allocated to store the zero bytes of application-level payload unless the user fragments a Buffer: this application-level payload is kept track of with a pair of integers which describe where in the buffer content the "virtual zero area" starts and ends.
* ***: unused bytes * xxx: bytes "added" at the front of the zero area * ...: bytes "added" at the back of the zero area * 000: virtual zero bytes * * Real byte buffer: |********xxxxxxxxxxxx.........*****| * |--------^ m_start * |-------------------^ m_zeroAreaStart * |-----------------------------^ m_end - (m_zeroAreaEnd - m_zeroAreaStart) * Virtual byte buffer: |xxxxxxxxxxxx0000000000000.........| * |--------^ m_start * |--------------------^ m_zeroAreaStart * |---------------------------------^ m_zeroAreaEnd * |------------------------------------------^ m_end *
A simple state invariant is that m_start <= m_zeroStart <= m_zeroEnd <= m_end
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Copy constructor.
o | the buffer to copy |
Definition at line 1055 of file buffer.h.
References CheckInternalState(), ns3::Buffer::Data::m_count, m_data, and NS_ASSERT.
ns3::Buffer::Buffer | ( | ) |
Definition at line 192 of file buffer.cc.
References Initialize(), and NS_LOG_FUNCTION.
ns3::Buffer::Buffer | ( | uint32_t | dataSize | ) |
Constructor.
The buffer will be initialized with zeroes up to its size.
dataSize | the buffer size |
Definition at line 198 of file buffer.cc.
References Initialize(), and NS_LOG_FUNCTION.
ns3::Buffer::Buffer | ( | uint32_t | dataSize, |
bool | initialize | ||
) |
Constructor.
If initialize is set to true, the buffer will be initialized with zeroes up to its size.
dataSize | the buffer size. |
initialize | initialize the buffer with zeroes. |
Definition at line 204 of file buffer.cc.
References Initialize(), and NS_LOG_FUNCTION.
ns3::Buffer::~Buffer | ( | ) |
Definition at line 287 of file buffer.cc.
References CheckInternalState(), g_recommendedStart, ns3::Buffer::Data::m_count, m_data, m_maxZeroAreaStart, NS_ASSERT, NS_LOG_FUNCTION, and Recycle().
void ns3::Buffer::AddAtEnd | ( | const Buffer & | o | ) |
o | the buffer to append to the end of this buffer. |
Add bytes at the end of the Buffer. Any call to this method invalidates any Iterator pointing to this Buffer.
This is an optimization which kicks in when we attempt to aggregate two buffers which contain adjacent zero areas.
Definition at line 406 of file buffer.cc.
References AddAtEnd(), Begin(), CheckInternalState(), CreateFullCopy(), End(), GetSize(), ns3::Buffer::Data::m_count, m_data, ns3::Buffer::Data::m_dirtyEnd, m_end, m_start, m_zeroAreaEnd, m_zeroAreaStart, NS_ASSERT, NS_LOG_FUNCTION, ns3::Buffer::Iterator::Prev(), and ns3::Buffer::Iterator::Write().
void ns3::Buffer::AddAtEnd | ( | uint32_t | end | ) |
end | size to reserve |
Add bytes at the end of the Buffer. The content of these bytes is undefined but debugging builds initialize them to 0x33. Any call to this method invalidates any Iterator pointing to this Buffer.
Definition at line 360 of file buffer.cc.
References CheckInternalState(), Create(), GetInternalEnd(), GetInternalSize(), LOG_INTERNAL_STATE, ns3::Buffer::Data::m_count, ns3::Buffer::Data::m_data, m_data, ns3::Buffer::Data::m_dirtyEnd, ns3::Buffer::Data::m_dirtyStart, m_end, m_maxZeroAreaStart, m_start, m_zeroAreaEnd, m_zeroAreaStart, NS_ASSERT, NS_LOG_FUNCTION, and Recycle().
Referenced by AddAtEnd(), ns3::Packet::AddAtEnd(), ns3::dsr::DsrOptionField::AddDsrOption(), ns3::OptionField::AddOption(), ns3::Packet::AddPaddingAtEnd(), ns3::Packet::AddTrailer(), CreateFullCopy(), ns3::dsr::DsrFsHeader::Deserialize(), ns3::dsr::DsrOptionHeader::Deserialize(), ns3::dsr::DsrOptionRerrHeader::Deserialize(), ns3::Ipv6ExtensionHeader::Deserialize(), ns3::Ipv6OptionHeader::Deserialize(), ns3::dsr::DsrOptionField::Deserialize(), ns3::OptionField::Deserialize(), Deserialize(), ns3::WifiInformationElement::DoDeserialize(), BufferTest::DoRun(), ns3::WifiInformationElement::operator==(), and ns3::Asn1Header::WriteOctet().
void ns3::Buffer::AddAtStart | ( | uint32_t | start | ) |
start | size to reserve |
Add bytes at the start of the Buffer. The content of these bytes is undefined but debugging builds initialize them to 0x33. Any call to this method invalidates any Iterator pointing to this Buffer.
Definition at line 314 of file buffer.cc.
References CheckInternalState(), Create(), GetInternalSize(), LOG_INTERNAL_STATE, ns3::Buffer::Data::m_count, ns3::Buffer::Data::m_data, m_data, ns3::Buffer::Data::m_dirtyEnd, ns3::Buffer::Data::m_dirtyStart, m_end, m_maxZeroAreaStart, m_start, m_zeroAreaEnd, m_zeroAreaStart, NS_ASSERT, NS_LOG_FUNCTION, and Recycle().
Referenced by ns3::Packet::Packet(), PbbTestCase::PbbTestCase(), ns3::Packet::AddHeader(), ns3::TcpHeader::CalculateHeaderChecksum(), ns3::UdpHeader::CalculateHeaderChecksum(), ns3::Icmpv6Header::CalculatePseudoHeaderChecksum(), TcpHeaderWithRFC793OptionTestCase::CheckCorrectDeserialize(), TcpHeaderWithRFC793OptionTestCase::CheckNoPadding(), ns3::SixLowPanNetDevice::CompressLowPanNhc(), CreateFullCopy(), ns3::SixLowPanNetDevice::DecompressLowPanNhc(), ns3::PbbTlv::Deserialize(), Deserialize(), ns3::WifiInformationElement::DoDeserialize(), DsrFsHeaderTest::DoRun(), TestEmptyOptionField::DoRun(), TestOptionWithoutAlignment::DoRun(), TestOptionWithAlignment::DoRun(), TestFulfilledAlignment::DoRun(), TcpHeaderGetSetTestCase::DoRun(), BufferTest::DoRun(), BasicMultiLinkElementTest::DoRun(), TcpHeaderWithRFC793OptionTestCase::OneOptionAtTime(), ns3::Ipv6ExtensionLooseRouting::Process(), ns3::Icmpv6DestinationUnreachable::Serialize(), ns3::Icmpv6TooBig::Serialize(), ns3::Icmpv6TimeExceeded::Serialize(), ns3::Icmpv6ParameterError::Serialize(), ns3::WifiInformationElement::SerializeFragments(), WifiEhtCapabilitiesIeTest::SerializeIntoBuffer(), WifiIeFragmentationTest::SerializeIntoBuffer(), ns3::PbbTlv::SetValue(), ns3::HeaderSerializationTestCase::TestHeaderSerialization(), TcpOptionWSTestCase::TestSerialize(), TcpOptionTSTestCase::TestSerialize(), PbbTestCase::TestSerialize(), and ns3::PcapFile::Write().
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Allocate a buffer data storage.
reqSize | the storage size to create |
Definition at line 166 of file buffer.cc.
References ns3::ALLOC_OVER_PROVISION, data, NS_ASSERT, and NS_LOG_FUNCTION.
Referenced by Create().
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Definition at line 1074 of file buffer.h.
References CheckInternalState(), and NS_ASSERT.
Referenced by ns3::Packet::Packet(), PbbTestCase::PbbTestCase(), AddAtEnd(), ns3::Packet::AddHeader(), ns3::TcpHeader::CalculateHeaderChecksum(), ns3::UdpHeader::CalculateHeaderChecksum(), ns3::Icmpv6Header::CalculatePseudoHeaderChecksum(), TcpHeaderWithRFC793OptionTestCase::CheckCorrectDeserialize(), TcpHeaderWithRFC793OptionTestCase::CheckNoPadding(), WifiEhtCapabilitiesIeTest::CheckSerializedByte(), WifiIeFragmentationTest::CheckSerializedByte(), ns3::SixLowPanNetDevice::CompressLowPanNhc(), CreateFullCopy(), ns3::SixLowPanNetDevice::DecompressLowPanNhc(), ns3::PbbTlv::Deserialize(), ns3::dsr::DsrFsHeader::Deserialize(), ns3::dsr::DsrOptionHeader::Deserialize(), ns3::dsr::DsrOptionRerrHeader::Deserialize(), ns3::Ipv6ExtensionHeader::Deserialize(), ns3::Ipv6OptionHeader::Deserialize(), ns3::dsr::DsrOptionField::Deserialize(), ns3::OptionField::Deserialize(), Deserialize(), ns3::WifiInformationElement::DoDeserialize(), DsrFsHeaderTest::DoRun(), TestEmptyOptionField::DoRun(), TestOptionWithoutAlignment::DoRun(), TestOptionWithAlignment::DoRun(), TestFulfilledAlignment::DoRun(), TcpHeaderGetSetTestCase::DoRun(), BufferTest::DoRun(), BasicMultiLinkElementTest::DoRun(), TcpHeaderWithRFC793OptionTestCase::OneOptionAtTime(), ns3::WifiInformationElement::operator==(), ns3::Packet::PeekHeader(), ns3::Ipv6ExtensionLooseRouting::Process(), ns3::Packet::RemoveHeader(), ns3::Asn1Header::Serialize(), ns3::dsr::DsrOptionField::Serialize(), ns3::OptionField::Serialize(), ns3::dsr::DsrOptionHeader::Serialize(), ns3::dsr::DsrOptionRerrHeader::Serialize(), ns3::Icmpv6DestinationUnreachable::Serialize(), ns3::Icmpv6TooBig::Serialize(), ns3::Icmpv6TimeExceeded::Serialize(), ns3::Icmpv6ParameterError::Serialize(), ns3::Ipv6OptionHeader::Serialize(), ns3::WifiInformationElement::SerializeFragments(), WifiEhtCapabilitiesIeTest::SerializeIntoBuffer(), WifiIeFragmentationTest::SerializeIntoBuffer(), ns3::PbbTlv::SetValue(), TcpOptionWSTestCase::TestDeserialize(), TcpOptionTSTestCase::TestDeserialize(), PbbTestCase::TestDeserialize(), ns3::HeaderSerializationTestCase::TestHeaderSerialization(), TcpOptionWSTestCase::TestSerialize(), TcpOptionTSTestCase::TestSerialize(), PbbTestCase::TestSerialize(), and ns3::PcapFile::Write().
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Checks the internal buffer structures consistency.
Used only for debugging purposes.
Definition at line 214 of file buffer.cc.
References LOG_INTERNAL_STATE, ns3::Buffer::Data::m_count, m_data, ns3::Buffer::Data::m_dirtyEnd, ns3::Buffer::Data::m_dirtyStart, m_end, ns3::Buffer::Data::m_size, m_start, m_zeroAreaEnd, m_zeroAreaStart, and NS_LOG_FUNCTION.
Referenced by Buffer(), ~Buffer(), AddAtEnd(), AddAtStart(), Begin(), CreateFragment(), CreateFullCopy(), End(), Initialize(), operator=(), PeekData(), RemoveAtEnd(), RemoveAtStart(), and TransformIntoRealBuffer().
void ns3::Buffer::CopyData | ( | std::ostream * | os, |
uint32_t | size | ||
) | const |
Copy the specified amount of data from the buffer to the given output stream.
os | the output stream |
size | the maximum amount of bytes to copy. If zero, nothing is copied. |
Definition at line 719 of file buffer.cc.
References anonymous_namespace{buffer.cc}::Zeroes::buffer, ns3::Buffer::Data::m_data, m_data, m_end, m_start, m_zeroAreaEnd, m_zeroAreaStart, NS_LOG_FUNCTION, and anonymous_namespace{buffer.cc}::Zeroes::size.
Referenced by ns3::Packet::CopyData(), BufferTest::DoRun(), and ns3::PcapFile::Write().
Copy the specified amount of data from the buffer to the given buffer.
buffer | the output buffer |
size | the maximum amount of bytes to copy. If zero, nothing is copied. |
Definition at line 748 of file buffer.cc.
References anonymous_namespace{buffer.cc}::Zeroes::buffer, ns3::Buffer::Data::m_data, m_data, m_end, m_start, m_zeroAreaEnd, m_zeroAreaStart, NS_LOG_FUNCTION, and anonymous_namespace{buffer.cc}::Zeroes::size.
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Create a buffer data storage.
size | the storage size to create |
Definition at line 120 of file buffer.cc.
References Allocate(), data, Deallocate(), g_freeList, IS_INITIALIZED, IS_UNINITIALIZED, NS_ASSERT, and NS_LOG_FUNCTION.
Referenced by AddAtEnd(), AddAtStart(), and Initialize().
start | offset from start of packet |
length |
Definition at line 529 of file buffer.cc.
References CheckInternalState(), GetSize(), NS_ASSERT, NS_LOG_FUNCTION, RemoveAtEnd(), and RemoveAtStart().
Referenced by ns3::Packet::CreateFragment(), and BufferTest::DoRun().
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Create a full copy of the buffer, including all the internal structures.
Definition at line 541 of file buffer.cc.
References AddAtEnd(), AddAtStart(), Begin(), CheckInternalState(), End(), ns3::Buffer::Data::m_data, m_data, m_end, m_start, m_zeroAreaEnd, m_zeroAreaStart, NS_ASSERT, NS_LOG_FUNCTION, ns3::Buffer::Iterator::Prev(), ns3::Buffer::Iterator::Write(), and ns3::Buffer::Iterator::WriteU8().
Referenced by AddAtEnd(), and TransformIntoRealBuffer().
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Deallocate the buffer memory.
data | the buffer data storage |
Definition at line 184 of file buffer.cc.
References data, NS_ASSERT, and NS_LOG_FUNCTION.
Referenced by ns3::Buffer::LocalStaticDestructor::~LocalStaticDestructor(), Create(), and Recycle().
buffer | points to buffer for deserialization |
size | number of bytes to deserialize |
The raw character buffer is deserialized and all the data is placed into this buffer.
Definition at line 654 of file buffer.cc.
References AddAtEnd(), AddAtStart(), Begin(), End(), Initialize(), NS_ASSERT, NS_LOG_FUNCTION, ns3::Buffer::Iterator::Prev(), and ns3::Buffer::Iterator::Write().
Referenced by ns3::Packet::Deserialize().
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Definition at line 1081 of file buffer.h.
References CheckInternalState(), and NS_ASSERT.
Referenced by AddAtEnd(), ns3::dsr::DsrOptionField::AddDsrOption(), ns3::OptionField::AddOption(), ns3::Packet::AddTrailer(), CreateFullCopy(), Deserialize(), BufferTest::DoRun(), ns3::Packet::PeekTrailer(), ns3::Packet::RemoveTrailer(), ns3::Asn1Header::Serialize(), ns3::dsr::DsrOptionField::Serialize(), ns3::OptionField::Serialize(), ns3::dsr::DsrOptionHeader::Serialize(), ns3::dsr::DsrOptionRerrHeader::Serialize(), ns3::Ipv6OptionHeader::Serialize(), and ns3::Asn1Header::WriteOctet().
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Get the buffer end position.
Definition at line 307 of file buffer.cc.
References m_end, m_zeroAreaEnd, m_zeroAreaStart, and NS_LOG_FUNCTION.
Referenced by AddAtEnd().
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Get the buffer real size.
Definition at line 300 of file buffer.cc.
References m_end, m_start, m_zeroAreaEnd, m_zeroAreaStart, and NS_LOG_FUNCTION.
Referenced by AddAtEnd(), and AddAtStart().
uint32_t ns3::Buffer::GetSerializedSize | ( | ) | const |
Return the number of bytes required for serialization.
Definition at line 566 of file buffer.cc.
References m_end, m_start, m_zeroAreaEnd, m_zeroAreaStart, and NS_LOG_FUNCTION.
Referenced by ns3::Packet::GetSerializedSize(), and ns3::Packet::Serialize().
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Definition at line 1068 of file buffer.h.
References m_end, and m_start.
Referenced by ns3::PbbTlv::~PbbTlv(), AddAtEnd(), ns3::dsr::DsrOptionField::CalculatePad(), ns3::OptionField::CalculatePad(), TcpHeaderWithRFC793OptionTestCase::CheckNoPadding(), ns3::SixLowPanNetDevice::CompressLowPanNhc(), CreateFragment(), ns3::Packet::CreateFragment(), ns3::dsr::DsrFsHeader::Deserialize(), ns3::Ipv6ExtensionHeader::Deserialize(), BufferTest::DoRun(), BasicMultiLinkElementTest::DoRun(), ns3::dsr::DsrOptionField::GetSerializedSize(), ns3::OptionField::GetSerializedSize(), ns3::PbbTlv::GetSerializedSize(), ns3::Asn1Header::GetSerializedSize(), ns3::Packet::GetSize(), TcpHeaderWithRFC793OptionTestCase::OneOptionAtTime(), ns3::PbbTlv::operator==(), ns3::PbbTlv::Print(), ns3::PbbTlv::Serialize(), ns3::dsr::DsrFsHeader::Serialize(), ns3::Ipv6ExtensionHeader::Serialize(), PbbTestCase::TestDeserialize(), ns3::HeaderSerializationTestCase::TestHeaderSerialization(), and PbbTestCase::TestSerialize().
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Initializes the buffer with a number of zeroes.
zeroSize | the zeroes size |
Definition at line 248 of file buffer.cc.
References CheckInternalState(), Create(), g_recommendedStart, m_data, ns3::Buffer::Data::m_dirtyEnd, ns3::Buffer::Data::m_dirtyStart, m_end, m_maxZeroAreaStart, ns3::Buffer::Data::m_size, m_start, m_zeroAreaEnd, m_zeroAreaStart, NS_ASSERT, and NS_LOG_FUNCTION.
Referenced by Buffer(), and Deserialize().
Assignment operator.
o | the buffer to copy |
Definition at line 263 of file buffer.cc.
References CheckInternalState(), g_recommendedStart, ns3::Buffer::Data::m_count, m_data, m_end, m_maxZeroAreaStart, m_start, m_zeroAreaEnd, m_zeroAreaStart, NS_ASSERT, and Recycle().
const uint8_t * ns3::Buffer::PeekData | ( | ) | const |
The returned pointer points to an area of memory which is ns3::Buffer::GetSize () bytes big. Please, try to never ever use this method. It is really evil and is present only for a few specific uses.
Definition at line 709 of file buffer.cc.
References CheckInternalState(), ns3::Buffer::Data::m_data, m_data, m_start, NS_ASSERT, NS_LOG_FUNCTION, and TransformIntoRealBuffer().
Referenced by ns3::SixLowPanNetDevice::CompressLowPanNhc(), DsrFsHeaderTest::DoRun(), TestEmptyOptionField::DoRun(), TestOptionWithoutAlignment::DoRun(), TestOptionWithAlignment::DoRun(), TestFulfilledAlignment::DoRun(), BufferTest::DoRun(), BufferTest::EnsureWrittenBytes(), ns3::PbbTlv::operator==(), ns3::WifiInformationElement::operator==(), ns3::dsr::DsrFsHeader::Serialize(), ns3::Ipv6ExtensionHeader::Serialize(), and PbbTestCase::TestSerialize().
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Recycle the buffer memory.
data | the buffer data storage |
Definition at line 101 of file buffer.cc.
References data, Deallocate(), g_freeList, g_maxSize, IS_DESTROYED, IS_INITIALIZED, IS_UNINITIALIZED, NS_ASSERT, and NS_LOG_FUNCTION.
Referenced by ~Buffer(), AddAtEnd(), AddAtStart(), and operator=().
void ns3::Buffer::RemoveAtEnd | ( | uint32_t | end | ) |
end | size to remove |
Remove bytes at the end of the Buffer. Any call to this method invalidates any Iterator pointing to this Buffer.
Definition at line 493 of file buffer.cc.
References CheckInternalState(), LOG_INTERNAL_STATE, m_end, m_maxZeroAreaStart, m_start, m_zeroAreaEnd, m_zeroAreaStart, NS_ASSERT, and NS_LOG_FUNCTION.
Referenced by ns3::PbbTlv::~PbbTlv(), CreateFragment(), ns3::dsr::DsrFsHeader::Deserialize(), ns3::Ipv6ExtensionHeader::Deserialize(), BufferTest::DoRun(), ns3::Packet::RemoveAtEnd(), and ns3::Packet::RemoveTrailer().
void ns3::Buffer::RemoveAtStart | ( | uint32_t | start | ) |
start | size to remove |
Remove bytes at the start of the Buffer. Any call to this method invalidates any Iterator pointing to this Buffer.
Definition at line 447 of file buffer.cc.
References CheckInternalState(), LOG_INTERNAL_STATE, m_end, m_maxZeroAreaStart, m_start, m_zeroAreaEnd, m_zeroAreaStart, NS_ASSERT, and NS_LOG_FUNCTION.
Referenced by ns3::SixLowPanNetDevice::CompressLowPanNhc(), CreateFragment(), BufferTest::DoRun(), ns3::Packet::RemoveAtStart(), and ns3::Packet::RemoveHeader().
buffer | points to serialization buffer |
maxSize | max number of bytes to write |
This buffer's contents are serialized into the raw character buffer parameter. Note: The zero length data is not copied entirely. Only the length of zero byte data is serialized.
Definition at line 582 of file buffer.cc.
References ns3::Buffer::Data::m_data, m_data, m_end, m_start, m_zeroAreaEnd, m_zeroAreaStart, and NS_LOG_FUNCTION.
Referenced by ns3::Packet::Serialize().
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Transform a "Virtual byte buffer" into a "Real byte buffer".
Definition at line 699 of file buffer.cc.
References CheckInternalState(), CreateFullCopy(), NS_ASSERT, and NS_LOG_FUNCTION.
Referenced by PeekData().
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location in a newly-allocated buffer where you should start writing data.
i.e., m_start should be initialized to this value.
Definition at line 772 of file buffer.h.
Referenced by ~Buffer(), Initialize(), and operator=().
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the buffer data storage
Definition at line 754 of file buffer.h.
Referenced by Buffer(), ~Buffer(), AddAtEnd(), AddAtStart(), CheckInternalState(), ns3::Buffer::Iterator::Construct(), CopyData(), CreateFullCopy(), ns3::Buffer::Iterator::GetDistanceFrom(), Initialize(), operator=(), PeekData(), ns3::Buffer::Iterator::PeekU8(), ns3::Buffer::Iterator::ReadNtohU16(), ns3::Buffer::Iterator::ReadNtohU32(), Serialize(), ns3::Buffer::Iterator::Write(), ns3::Buffer::Iterator::WriteHtonU16(), ns3::Buffer::Iterator::WriteHtonU32(), and ns3::Buffer::Iterator::WriteU8().
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offset to the end of the data referenced by this Buffer instance from the start of m_data->m_data
Definition at line 793 of file buffer.h.
Referenced by AddAtEnd(), AddAtStart(), CheckInternalState(), ns3::Buffer::Iterator::Construct(), CopyData(), CreateFullCopy(), GetInternalEnd(), GetInternalSize(), GetSerializedSize(), GetSize(), Initialize(), operator=(), RemoveAtEnd(), RemoveAtStart(), and Serialize().
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keep track of the maximum value of m_zeroAreaStart across the lifetime of a Buffer instance.
This variable is used purely as a source of information for the heuristics which decide on the position of the zero area in new buffers. It is read from the Buffer destructor to update the global heuristic data and these global heuristic data are used from the Buffer constructor to choose an initial value for m_zeroAreaStart.
Definition at line 766 of file buffer.h.
Referenced by ~Buffer(), AddAtEnd(), AddAtStart(), Initialize(), operator=(), RemoveAtEnd(), and RemoveAtStart().
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offset to the start of the data referenced by this Buffer instance from the start of m_data->m_data
Definition at line 788 of file buffer.h.
Referenced by AddAtEnd(), AddAtStart(), CheckInternalState(), ns3::Buffer::Iterator::Construct(), CopyData(), CreateFullCopy(), GetInternalSize(), GetSerializedSize(), GetSize(), Initialize(), operator=(), PeekData(), RemoveAtEnd(), RemoveAtStart(), and Serialize().
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offset to the end of the virtual zero area from the start of m_data->m_data
Definition at line 783 of file buffer.h.
Referenced by AddAtEnd(), AddAtStart(), CheckInternalState(), ns3::Buffer::Iterator::Construct(), CopyData(), CreateFullCopy(), GetInternalEnd(), GetInternalSize(), GetSerializedSize(), Initialize(), operator=(), RemoveAtEnd(), RemoveAtStart(), and Serialize().
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offset to the start of the virtual zero area from the start of m_data->m_data
Definition at line 778 of file buffer.h.
Referenced by AddAtEnd(), AddAtStart(), CheckInternalState(), ns3::Buffer::Iterator::Construct(), CopyData(), CreateFullCopy(), GetInternalEnd(), GetInternalSize(), GetSerializedSize(), Initialize(), operator=(), RemoveAtEnd(), RemoveAtStart(), and Serialize().