(Chilkat2-Python) Compress Text Feed to Binary

This example receives incoming text data in chunks, compresses as a stream, and accumulates the compressed binary data.

The purpose is to demonstrate the BeginCompressString, MoreCompressString, and EndCompressString methods.

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS, Solaris

import chilkat2

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

compressedData = chilkat2.BinData()

compress = chilkat2.Compression()
compress.Algorithm = "deflate"
compress.Charset = "utf-8"

sbIndex = chilkat2.StringBuilder()

for i in range(0,25):
    # Note: It is possible (and normal) for a BeginCompress* or MoreCompress* method to return
    # an empty string (or 0 bytes).  When this happens, the input data is not lost.  It will be flushed
    # in a subsequent call.
    sbIndex.Clear()
    sbIndex.AppendInt(i)
    if (i == 0):
        # compressedBytes is a memoryview
        compressedBytes = compress.BeginCompressString(sbIndex.GetAsString())
    else:
        # compressedBytes is a memoryview
        compressedBytes = compress.MoreCompressString(sbIndex.GetAsString())

    compressedData.AppendBinary(compressedBytes)
    # compressedBytes is a memoryview
    compressedBytes = compress.MoreCompressString(": This is a line of data to be compressed...\r\n")
    compressedData.AppendBinary(compressedBytes)

# Flush any remaining output.
# compressedBytes is a memoryview
compressedBytes = compress.EndCompressString()
compressedData.AppendBinary(compressedBytes)

# Show the compressed data in hex format:
print("The hex encoded compressed text:")
print(compressedData.GetEncoded("hex"))

# Now decompress in one call:
# compressedBytes is a memoryview
compressedBytes = compressedData.GetBinary()
originalText = compress.DecompressString(compressedBytes)
print(originalText)