public void AddTag(string comment = "new tag comment", double tagTimeSec = 0)
{
if (tagSectionItemCount == 0)
{
// no comments exist in this file, so make a new tagSection from scratch and update the map
Log("Creating new tag section from scratch");
long fileSizeBytes = new System.IO.FileInfo(abfPath).Length;
long bytePositionNewBlock = AddBlock(2);
tagSectionBlock = (int)(bytePositionNewBlock / BLOCKSIZE);
tagSectionItemCount += 1;
}
AbfTag tag = new AbfTag(0, "", abfTagTimeMult, abfSweepLengthSec);
tag.SetComment(comment);
tag.SetTimeSec(tagTimeSec);
tags.Add(tag);
Log($"Created Tag #{tags.Count}");
}
/// <summary>
/// Write the present tag list into the file
/// </summary>
public void WriteTags()
{
// open file (ENTIRELY LOCAL SCOPE)
Log($"Opening ABF file for modification...");
System.IO.FileStream abfFile = System.IO.File.Open(abfPath, System.IO.FileMode.Open);
// write the block position
abfFile.Seek(tagSectionBlock_position, System.IO.SeekOrigin.Begin);
byte[] bytesBlock = BitConverter.GetBytes(tagSectionBlock);
Log($"Writing tag section block ({tagSectionBlock}) as {bytesBlock.Length} bytes to position: {abfFile.Position}");
abfFile.Write(bytesBlock, 0, bytesBlock.Length);
// write the item size
if (tagSectionItemSize_position > 0)
{
abfFile.Seek(tagSectionItemSize_position, System.IO.SeekOrigin.Begin);
if (tagSectionItemSize == 0)
{
tagSectionItemSize = 64;
}
byte[] bytesItemSize = BitConverter.GetBytes(tagSectionItemSize);
Log($"Writing tag item size ({tagSectionItemSize}) as {bytesItemSize.Length} bytes to position: {abfFile.Position}");
abfFile.Write(bytesItemSize, 0, bytesItemSize.Length);
}
// write the tag count
abfFile.Seek(tagSectionItemCount_position, System.IO.SeekOrigin.Begin);
byte[] bytesTagCount = BitConverter.GetBytes(tags.Count);
Log($"Writing tag count ({tags.Count}) as {bytesTagCount.Length} bytes to position: {abfFile.Position}");
abfFile.Write(bytesTagCount, 0, bytesTagCount.Length);
for (int i = 0; i < tags.Count; i++)
{
AbfTag tag = tags[i];
Log($"Writing content of tag {i + 1}");
// seek to this tag location
int byteLocation = tagSectionBlock * BLOCKSIZE + i * tagSectionItemSize;
abfFile.Seek(byteLocation, System.IO.SeekOrigin.Begin);
// write the tag location (4 bytes)
byte[] bytesTagTime = BitConverter.GetBytes(tag.tagTime);
Log($"Writing tag time ({tag.tagTime}) as {bytesTagTime.Length} bytes to position: {abfFile.Position}");
abfFile.Write(bytesTagTime, 0, bytesTagTime.Length);
// write the tag comment (56 bytes)
string sComment = tag.comment.PadRight(COMMENT_STRING_LENGTH, ' ');
byte[] bytesComment = Encoding.ASCII.GetBytes(sComment);
Log($"Writing comment ({tag.comment}) as {bytesComment.Length} bytes to position: {abfFile.Position}");
abfFile.Write(bytesComment, 0, bytesComment.Length);
// write the tag type (2 bytes)
int tagType = 1;
byte[] bytesTagType = BitConverter.GetBytes(tagType);
Log($"Writing tag type ({tagType}) as {bytesTagType.Length} bytes to position: {abfFile.Position}");
abfFile.Write(bytesTagType, 0, bytesTagType.Length);
}
abfFile.Close();
Log($"ABF file closed.");
Log("ABF file writing complete!");
}
private void ReadTags()
{
if (abfVersionMajor == 1)
{
// READING TAGS IN ABF1 FILES:
// the tag position in memory is lTagSectionPtr (signed int at byte 44)
// the number of tags is lNumTagEntries (signed int at byte 48)
// each tag structure is (int32, "56s", short) (lTagTime, sComment, nTagType)
// this makes each tag 64 bytes long.
// fADCSampleInterval is needed to convert lTagTime to seconds
// the position of tags is to be found at this byte location
tagSectionBlock_position = 44;
tagSectionBlock = BytesToInt(FileReadBytes(4, tagSectionBlock_position));
// size of each tag item is fixed
tagSectionItemSize_position = -1;
tagSectionItemSize = 64;
// the number of tags in the file is defined here
tagSectionItemCount_position = 48;
tagSectionItemCount = BytesToInt(FileReadBytes(4, tagSectionItemCount_position));
// display info about the tag section
Log($"Tag section: block={tagSectionBlock}, itemSize={tagSectionItemSize}, itemCount={tagSectionItemCount}");
Log($"Tag section byte positions: ({tagSectionBlock_position}, {tagSectionItemSize_position}, {tagSectionItemCount_position})");
double fADCSampleInterval = BytesToFloat(FileReadBytes(4, 122));
abfTagTimeMult = fADCSampleInterval / 1e6;
Log($"fADCSampleInterval: {fADCSampleInterval}");
// to get the sweep lenght, we need to know a lot of things:
double dataRate = 1e6 / fADCSampleInterval;
Log($"dataRate: {dataRate}");
// lActualAcqLength (4-byte signed int @ byte 10)
int dataPointCount = BytesToInt(FileReadBytes(4, 10));
Log($"dataPointCount: {dataPointCount}");
// lActualEpisodes (4-byte signed int @ byte 16)
int sweepCount = BytesToInt(FileReadBytes(4, 16));
abfSweepCount = sweepCount;
// compensate for gap-free files
if (sweepCount == 0)
{
sweepCount = 1;
}
Log($"sweepCount: {sweepCount}");
// nADCNumChannels (2-byte signed int @ byte 120)
int channelCount = BytesToInt(FileReadBytes(2, 120));
Log($"channelCount: {channelCount}");
// now you can claculate sweep length in seconds
abfTotalLengthSec = dataPointCount / channelCount / dataRate;
Log($"abfTotalLengthSec: {abfTotalLengthSec}");
abfSweepLengthSec = dataPointCount / sweepCount / channelCount / dataRate;
Log($"sweepLengthSec: {abfSweepLengthSec}");
// loop across the tags and add them to the list
for (int tagIndex = 0; tagIndex < tagSectionItemCount; tagIndex++)
{
int tagBytePos = tagSectionBlock * BLOCKSIZE + tagIndex * tagSectionItemSize;
fs.Seek(tagBytePos, System.IO.SeekOrigin.Begin);
int lTagTime = BytesToInt(FileReadBytes(4));
string sComment = BytesToString(FileReadBytes(COMMENT_STRING_LENGTH)).Trim();
int nTagType = BytesToInt(FileReadBytes(2));
if (nTagType != 1)
{
MessageBox.Show($"Tag {tagIndex + 1} is not a comment tag. It could be damaged by this program.", "WARNING!!!");
}
AbfTag tag = new AbfTag(lTagTime, sComment, abfTagTimeMult, abfSweepLengthSec);
tags.Add(tag);
Log($"Tag #{tagIndex + 1}: type {nTagType}, time {lTagTime} ({tag.tagTimeSec} sec), comment: \"{sComment}\"");
}
}
else if (abfVersionMajor == 2)
{
// READING TAGS IN ABF2 FILES:
// the file has certain locations which store byte positions of tag info
tagSectionBlock_position = 252;
tagSectionItemSize_position = tagSectionBlock_position + 4;
tagSectionItemCount_position = tagSectionBlock_position + 8;
// Read the tagSection to get the ()
// tagSection information is at byte 252. It contains (4-byte ints): position, itemSize, and itemCount
fs.Seek(tagSectionBlock_position, System.IO.SeekOrigin.Begin);
tagSectionBlock = BytesToInt(FileReadBytes(4));
tagSectionItemSize = BytesToInt(FileReadBytes(4));
tagSectionItemCount = BytesToInt(FileReadBytes(4));
// display info about the tag section
Log($"Tag section: block={tagSectionBlock}, itemSize={tagSectionItemSize}, itemCount={tagSectionItemCount}");
Log($"Tag section byte positions: ({tagSectionBlock_position}, {tagSectionItemSize_position}, {tagSectionItemCount_position})");
// read protocolSection (which contains fSynchTimeUnit) needed to convert tagTime to seconds
// protocolSection is a 4-byte float 14 bytes after the start of the protocolSection
int protocolSectionFirstBlock = BytesToInt(FileReadBytes(4, 76));
double fSynchTimeUnit = BytesToFloat(FileReadBytes(4, protocolSectionFirstBlock * BLOCKSIZE + 14));
abfTagTimeMult = fSynchTimeUnit / 1e6;
// to determine sweep length, we actually need to know a few things:
// the data point count is the third value from the section map of the DataSection
// this is a 4-bit uint32 at byte position 236+4+4
int dataPointCount = BytesToInt(FileReadBytes(4, 236 + 4 + 4));
Log($"dataPointCount: {dataPointCount}");
// sweep count is lActualEpisodes from the header (a uInt32 at byte 12)
int sweepCount = BytesToInt(FileReadBytes(4, 12));
abfSweepCount = sweepCount;
// compensate for gap-free files
if (sweepCount == 0)
{
sweepCount = 1;
}
Log($"sweepCount: {sweepCount}");
// channel count comes from the number of sections in the ADCSection map (byte 92+4+4)
int channelCount = BytesToInt(FileReadBytes(4, 92 + 4 + 4));
Log($"channelCount: {channelCount}");
// fADCSequenceInterval is a 4-byte float two bytes into the protocol section
int protocolSectionFirstByte = BytesToInt(FileReadBytes(4, 76)) * BLOCKSIZE;
double fADCSequenceInterval = BytesToFloat(FileReadBytes(4, protocolSectionFirstByte + 2));
Log($"fADCSequenceInterval: {fADCSequenceInterval}");
// sample rate is the inverse of fADCSequenceInterval (in microseconds)
double dataRate = 1e6 / fADCSequenceInterval;
Log($"dataRate: {dataRate}");
// now you can claculate sweep length in seconds
abfTotalLengthSec = dataPointCount / channelCount / dataRate;
Log($"abfTotalLengthSec: {abfTotalLengthSec}");
abfSweepLengthSec = dataPointCount / sweepCount / channelCount / dataRate;
Log($"sweepLengthSec: {abfSweepLengthSec}");
// loop across the tags and add them to the list
for (int tagIndex = 0; tagIndex < tagSectionItemCount; tagIndex++)
{
int tagBytePos = tagSectionBlock * BLOCKSIZE + tagIndex * tagSectionItemSize;
fs.Seek(tagBytePos, System.IO.SeekOrigin.Begin);
int lTagTime = BytesToInt(FileReadBytes(4));
string sComment = BytesToString(FileReadBytes(COMMENT_STRING_LENGTH)).Trim();
int nTagType = BytesToInt(FileReadBytes(2));
if (nTagType != 1)
{
MessageBox.Show($"Tag {tagIndex + 1} is not a comment tag. It could be damaged by this program.", "WARNING!!!");
}
AbfTag tag = new AbfTag(lTagTime, sComment, abfTagTimeMult, abfSweepLengthSec);
tags.Add(tag);
Log($"Tag #{tagIndex + 1}: type {nTagType}, time {lTagTime} ({tag.tagTimeSec} sec), comment: \"{sComment}\"");
}
}
}