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parse.go
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parse.go
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package mcap
import (
"fmt"
"io"
)
// ParseHeader parses a header record.
func ParseHeader(buf []byte) (*Header, error) {
profile, offset, err := getPrefixedString(buf, 0)
if err != nil {
return nil, fmt.Errorf("failed to read profile: %w", err)
}
library, _, err := getPrefixedString(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read library: %w", err)
}
return &Header{
Profile: profile,
Library: library,
}, nil
}
// ParseFooter parses a footer record.
func ParseFooter(buf []byte) (*Footer, error) {
summaryStart, offset, err := getUint64(buf, 0)
if err != nil {
return nil, fmt.Errorf("failed to read summary start: %w", err)
}
summaryOffsetStart, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read summary offset start: %w", err)
}
summaryCrc, _, err := getUint32(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read summary CRC: %w", err)
}
return &Footer{
SummaryStart: summaryStart,
SummaryOffsetStart: summaryOffsetStart,
SummaryCRC: summaryCrc,
}, nil
}
// ParseSchema parses a schema record.
func ParseSchema(buf []byte) (*Schema, error) {
schemaID, offset, err := getUint16(buf, 0)
if err != nil {
return nil, fmt.Errorf("failed to read schema ID: %w", err)
}
name, offset, err := getPrefixedString(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read schema name: %w", err)
}
encoding, offset, err := getPrefixedString(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read encoding: %w", err)
}
data, _, err := getPrefixedBytes(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read schema data: %w", err)
}
return &Schema{
ID: schemaID,
Name: name,
Encoding: encoding,
Data: append([]byte{}, data...),
}, nil
}
// ParseChannel parses a channel record.
func ParseChannel(buf []byte) (*Channel, error) {
channelID, offset, err := getUint16(buf, 0)
if err != nil {
return nil, fmt.Errorf("failed to read channel id: %w", err)
}
schemaID, offset, err := getUint16(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read schema ID: %w", err)
}
topic, offset, err := getPrefixedString(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read topic name: %w", err)
}
messageEncoding, offset, err := getPrefixedString(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read message encoding: %w", err)
}
metadata, _, err := getPrefixedMap(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read metadata: %w", err)
}
return &Channel{
ID: channelID,
SchemaID: schemaID,
Topic: topic,
MessageEncoding: messageEncoding,
Metadata: metadata,
}, nil
}
// PopulateFrom populates the fields of a Message struct from the message data slice.
func (m *Message) PopulateFrom(buf []byte, copyData bool) error {
channelID, offset, err := getUint16(buf, 0)
if err != nil {
return fmt.Errorf("failed to read channel ID: %w", err)
}
sequence, offset, err := getUint32(buf, offset)
if err != nil {
return fmt.Errorf("failed to read sequence: %w", err)
}
logTime, offset, err := getUint64(buf, offset)
if err != nil {
return fmt.Errorf("failed to read record time: %w", err)
}
publishTime, offset, err := getUint64(buf, offset)
if err != nil {
return fmt.Errorf("failed to read publish time: %w", err)
}
data := buf[offset:]
m.ChannelID = channelID
m.Sequence = sequence
m.LogTime = logTime
m.PublishTime = publishTime
if copyData {
m.Data = append(m.Data[:0], data...)
} else {
m.Data = data
}
return nil
}
// ParseMessage parses a message record.
func ParseMessage(buf []byte) (*Message, error) {
msg := &Message{}
if err := msg.PopulateFrom(buf, false); err != nil {
return nil, err
}
return msg, nil
}
// ParseChunk parses a chunk record.
func ParseChunk(buf []byte) (*Chunk, error) {
messageStartTime, offset, err := getUint64(buf, 0)
if err != nil {
return nil, fmt.Errorf("failed to read start time: %w", err)
}
messageEndTime, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read end time: %w", err)
}
uncompressedSize, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read uncompressed size: %w", err)
}
uncompressedCRC, offset, err := getUint32(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read uncompressed CRC: %w", err)
}
compression, offset, err := getPrefixedString(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read compression: %w", err)
}
recordsLength, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read compression: %w", err)
}
records := buf[offset : offset+int(recordsLength)]
return &Chunk{
MessageStartTime: messageStartTime,
MessageEndTime: messageEndTime,
UncompressedSize: uncompressedSize,
UncompressedCRC: uncompressedCRC,
Compression: compression,
Records: records,
}, nil
}
// ParseMessageIndex parses a message index record.
func ParseMessageIndex(buf []byte) (*MessageIndex, error) {
channelID, offset, err := getUint16(buf, 0)
if err != nil {
return nil, fmt.Errorf("failed to read channel ID: %w", err)
}
entriesByteLength, offset, err := getUint32(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read message index entries byte length: %w", err)
}
var value, stamp uint64
var start = offset
records := make([]MessageIndexEntry, 0, (len(buf)-2)/(8+8))
for uint32(offset) < uint32(start)+entriesByteLength {
stamp, offset, err = getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read message index entry stamp: %w", err)
}
value, offset, err = getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read message index entry value: %w", err)
}
records = append(records, MessageIndexEntry{
Timestamp: stamp,
Offset: value,
})
}
return &MessageIndex{
ChannelID: channelID,
Records: records,
}, nil
}
// ParseChunkIndex parses a chunk index record.
func ParseChunkIndex(buf []byte) (*ChunkIndex, error) {
messageStartTime, offset, err := getUint64(buf, 0)
if err != nil {
return nil, fmt.Errorf("failed to read start time: %w", err)
}
messageEndTime, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read end time: %w", err)
}
chunkStartOffset, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read chunk start offset: %w", err)
}
chunkLength, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read chunk length: %w", err)
}
msgIndexOffsetsLen, offset, err := getUint32(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read message index length: %w", err)
}
messageIndexOffsets := make(map[uint16]uint64)
var channelID uint16
var indexOffset uint64
inset := 0
for inset < int(msgIndexOffsetsLen) {
channelID, inset, err = getUint16(buf[offset:], inset)
if err != nil {
return nil, fmt.Errorf("failed to read channel ID: %w", err)
}
indexOffset, inset, err = getUint64(buf[offset:], inset)
if err != nil {
return nil, fmt.Errorf("failed to read index offset: %w", err)
}
messageIndexOffsets[channelID] = indexOffset
}
offset += inset
msgIndexLength, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read message index length: %w", err)
}
compression, offset, err := getPrefixedString(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read compression: %w", err)
}
compressedSize, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read compressed size: %w", err)
}
uncompressedSize, _, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read uncompressed size: %w", err)
}
return &ChunkIndex{
MessageStartTime: messageStartTime,
MessageEndTime: messageEndTime,
ChunkStartOffset: chunkStartOffset,
ChunkLength: chunkLength,
MessageIndexOffsets: messageIndexOffsets,
MessageIndexLength: msgIndexLength,
Compression: CompressionFormat(compression),
CompressedSize: compressedSize,
UncompressedSize: uncompressedSize,
}, nil
}
func parseAttachmentReader(
r io.Reader,
computeCRC bool,
) (*AttachmentReader, error) {
buf := make([]byte, 8)
crcReader := newCRCReader(r, computeCRC)
logTime, err := readUint64(buf, crcReader)
if err != nil {
return nil, fmt.Errorf("failed to read record time: %w", err)
}
createTime, err := readUint64(buf, crcReader)
if err != nil {
return nil, fmt.Errorf("failed to read create time: %w", err)
}
name, err := readPrefixedString(buf, crcReader)
if err != nil {
return nil, fmt.Errorf("failed to read attachment name: %w", err)
}
mediaType, err := readPrefixedString(buf, crcReader)
if err != nil {
return nil, fmt.Errorf("failed to read media type: %w", err)
}
dataSize, err := readUint64(buf, crcReader)
if err != nil {
return nil, fmt.Errorf("failed to read attachment data size: %w", err)
}
limitReader := &io.LimitedReader{
R: crcReader,
N: int64(dataSize),
}
return &AttachmentReader{
LogTime: logTime,
CreateTime: createTime,
Name: name,
MediaType: mediaType,
DataSize: dataSize,
baseReader: r,
crcReader: crcReader,
data: limitReader,
}, nil
}
// ParseAttachmentIndex parses an attachment index record.
func ParseAttachmentIndex(buf []byte) (*AttachmentIndex, error) {
attachmentOffset, offset, err := getUint64(buf, 0)
if err != nil {
return nil, fmt.Errorf("failed to read attachment offset: %w", err)
}
length, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read attachment length: %w", err)
}
logTime, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read record time: %w", err)
}
createTime, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read create time: %w", err)
}
dataSize, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read data size: %w", err)
}
name, offset, err := getPrefixedString(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read attachment name: %w", err)
}
mediaType, _, err := getPrefixedString(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read media type: %w", err)
}
return &AttachmentIndex{
Offset: attachmentOffset,
Length: length,
LogTime: logTime,
CreateTime: createTime,
DataSize: dataSize,
Name: name,
MediaType: mediaType,
}, nil
}
// ParseStatistics parses a statistics record.
func ParseStatistics(buf []byte) (*Statistics, error) {
if minLength := 8 + 2 + 4 + 4 + 4 + 4 + 4 + 8 + 8; len(buf) < minLength {
return nil, fmt.Errorf("short statistics record %d < %d: %w", len(buf), minLength, io.ErrShortBuffer)
}
messageCount, offset, err := getUint64(buf, 0)
if err != nil {
return nil, fmt.Errorf("failed to read message count: %w", err)
}
schemaCount, offset, err := getUint16(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read schema count: %w", err)
}
channelCount, offset, err := getUint32(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read channel count: %w", err)
}
attachmentCount, offset, err := getUint32(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read attachment count: %w", err)
}
metadataCount, offset, err := getUint32(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read metadata count: %w", err)
}
chunkCount, offset, err := getUint32(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read chunk count: %w", err)
}
messageStartTime, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read message start time: %w", err)
}
messageEndTime, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read message end time: %w", err)
}
channelMessageCountLength, offset, err := getUint32(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read message count length: %w", err)
}
var chanID uint16
var channelMessageCount uint64
channelMessageCounts := make(map[uint16]uint64)
start := offset
if len(buf) < start+int(channelMessageCountLength) {
return nil, fmt.Errorf("short channel message count lengths: %w", io.ErrShortBuffer)
}
for offset < start+int(channelMessageCountLength) {
chanID, offset, err = getUint16(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read message count channel ID: %w", err)
}
channelMessageCount, offset, err = getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read channel message count: %w", err)
}
channelMessageCounts[chanID] = channelMessageCount
}
return &Statistics{
MessageCount: messageCount,
SchemaCount: schemaCount,
ChannelCount: channelCount,
AttachmentCount: attachmentCount,
MetadataCount: metadataCount,
ChunkCount: chunkCount,
MessageStartTime: messageStartTime,
MessageEndTime: messageEndTime,
ChannelMessageCounts: channelMessageCounts,
}, nil
}
// ParseMetadata parses a metadata record.
func ParseMetadata(buf []byte) (*Metadata, error) {
name, offset, err := getPrefixedString(buf, 0)
if err != nil {
return nil, fmt.Errorf("failed to read metadata name: %w", err)
}
metadata, _, err := getPrefixedMap(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read metadata: %w", err)
}
return &Metadata{
Name: name,
Metadata: metadata,
}, nil
}
// ParseMetadataIndex parses a metadata index record.
func ParseMetadataIndex(buf []byte) (*MetadataIndex, error) {
recordOffset, offset, err := getUint64(buf, 0)
if err != nil {
return nil, fmt.Errorf("failed to read metadata offset: %w", err)
}
length, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read metadata length: %w", err)
}
name, _, err := getPrefixedString(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read metadata name: %w", err)
}
return &MetadataIndex{
Offset: recordOffset,
Length: length,
Name: name,
}, nil
}
// ParseSummaryOffset parses a summary offset record.
func ParseSummaryOffset(buf []byte) (*SummaryOffset, error) {
if len(buf) < 17 {
return nil, io.ErrShortBuffer
}
groupOpcode := buf[0]
offset := 1
groupStart, offset, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read group start: %w", err)
}
groupLength, _, err := getUint64(buf, offset)
if err != nil {
return nil, fmt.Errorf("failed to read group length: %w", err)
}
return &SummaryOffset{
GroupOpcode: OpCode(groupOpcode),
GroupStart: groupStart,
GroupLength: groupLength,
}, nil
}
// ParseDataEnd parses a data end record.
func ParseDataEnd(buf []byte) (*DataEnd, error) {
crc, _, err := getUint32(buf, 0)
if err != nil {
return nil, fmt.Errorf("failed to read CRC: %w", err)
}
return &DataEnd{
DataSectionCRC: crc,
}, nil
}