Embedding ZIP Files Inside JPG Files Using ColdFusion

code-1.cfm

<!---
	Store the name of the image file into which we want
	to embed the zipped data.
--->
<cfset strImageFile = "girl.jpg" />

<!---
	This is the name of our new graphic with the embedded
	zip file.
--->
<cfset strNewImageFile = "special_girl.jpg" />


<!---
	Create the array of files we want to zip up and embed
	with in the image file.
--->
<cfset arrFileNames = [
	"DataFile_1.txt",
	"DataFile_2.txt",
	"DataFile_3.txt",
	"Song.mp3"
	] />


<!---
	Create our ZIP file based using all of the files above.
	This is the zip file that will be embedded in the image.
--->
<cfzip
	action="zip"
	file="#ExpandPath( './data.zip' )#"
	overwrite="true">

	<!--- Loop over files to add zip entries. --->
	<cfloop
		index="strFileName"
		array="#arrFileNames#">

		<cfzipparam
			source="#ExpandPath( './#strFileName#' )#"
			/>

	</cfloop>

</cfzip>


<!---
	Create a binary output stream. This will be used to
	copy the zip file to the image file.
--->
<cfset objOutputStream = CreateObject(
	"java",
	"java.io.ByteArrayOutputStream"
	).Init()
	/>


<!---
	Loop over files that we want to join. The first is the
	image and the second is our zip data file.
--->
<cfloop
	index="strFileName"
	list="#strImageFile#|data.zip"
	delimiters="|">

	<!--- Read in the file binary data (byte array). --->
	<cffile
		action="readbinary"
		file="#ExpandPath( './#strFileName#' )#"
		variable="binFileData"
		/>

	<!--- Append the file to the binary output buffer. --->
	<cfset objOutputStream.Write(
		binFileData,
		JavaCast( "int", 0 ),
		JavaCast( "int", ArrayLen( binFileData ) )
		) />

</cfloop>


<!--- Write the byte array stream to disk. --->
<cffile
	action="write"
	file="#ExpandPath( strNewImageFile )#"
	output="#objOutputStream.ToByteArray()#"
	/>


<!---
	Now, read the image file into ColdFusion and write it
	to the browser. This will test to see if it can be read
	and manipulated properly as an image.
--->
<p>
	<cfimage
		action="writetobrowser"
		source="#strNewImageFile#"
		format="png"
		/>
</p>


<!---
	Now, read the contents of the "zip" data out of the new
	image file. This will test to see if the image file can
	be read and properly manipulated as a ZIP file.
--->
<cfzip
	action="list"
	file="#ExpandPath( strNewImageFile )#"
	name="qEntry"
	/>

<!--- Trim the query for output. --->
<cfquery name="qEntry" dbtype="query">
	SELECT
		name,
		size,
		type
	FROM
		qEntry
</cfquery>

<!--- Output the ColdFusion query. --->
<cfdump
	var="#qEntry#"
	label="#strNewImageFile# w/ Data Zip"
	/>


<!--- Read the text data for a given entry. --->
<cfzip
	action="unzip"
	file="#ExpandPath( strNewImageFile )#"
	destination="#ExpandPath( './output' )#"
	entrypath="DataFile_1.txt"
	/>

<!--- Include the text file. --->
<p>
	<cfinclude template="./output/DataFile_1.txt" />
</p>