Function GenerateUploadChunks

internal/sessions/transfer.go:186–218

--------------------------------------------------------------------------- Chunk generation --------------------------------------------------------------------------- GenerateUploadChunks splits data into base64-encoded chunks and generates the shell commands. The first chunk creates the file (>),

(data []byte, targetPath string, plan TransferPlan)

// the shell commands. The first chunk creates the file (>), subsequent chunks
// append (>>).
func GenerateUploadChunks(data []byte, targetPath string, plan TransferPlan) []UploadChunk {
	if plan.Strategy == StrategyDirectTool || len(data) == 0 {
		return nil
	}

	chunkSize := plan.ChunkSize
	if chunkSize <= 0 {
		chunkSize = defaultProfile.ChunkSizeBytes
	}

	var chunks []UploadChunk
	for offset := 0; offset < len(data); offset += chunkSize {
		end := offset + chunkSize
		if end > len(data) {
			end = len(data)
		}

		b64 := base64.StdEncoding.EncodeToString(data[offset:end])
		redirect := ">>"
		if offset == 0 {
			redirect = ">"
		}

		cmd := fmt.Sprintf("echo '%s' | base64 -d %s '%s'", b64, redirect, targetPath)

		chunks = append(chunks, UploadChunk{
			Index:      len(chunks),
			Base64Data: b64,
			Command:    cmd,
		})
	}
	return chunks
}

// GenerateDownloadChunks generates shell commands that read sequential chunks
// of a file via dd+base64.