EzlibExample: -Using EZLIB to Compress and Decompress Files

This overview describes the example application that demonstrates the usage -of the EZLIB API.

Download

Click -on the following link to download the example: EzlibExample.zip

Click: browse to view the example code.

Description

EZLIB -is a utility API used to compress and decompress data. The API is an extension -of ZLIB compression library. For more information on ZLIB compression library, -refer to RFC1950.

This -example application uses the EZLIB API to extract files from a .zip and -a .gz file into specified folders, and to compress a .wav file -into a .gz file. The application reads input files and -stores the extracted files in c:\private\E80000B7\.

The -application uses an object of the RFs class to open the EzlibZipFolder.zip file. -It reads the properties of each file in the archive using the CZipFileMember object -and prints it to the console.

After reading all the properties of -each file in the archive, the application extracts all the files to the specified -folder using the CZipFile::GetInputStreamL() method.

Other -than extracting all the files in the archive, the application also searches -for a specific file using the CZipFile::CaseInsensitiveMemberL() method -and extracts it.

The application also opens the icon.bmp.gz file -and extracts its contents to the specified location. The GZip file is represented -by an object of the CEZGZipToFile class and its contents -are extracted using the CEZGZipToFile::InflateL() method.

Finally, -the application compresses the error.wav file to a .gz file. -The GZip file being created is represented by an object of the CEZFileToGZip class -and the .wav file is compressed using the CEZFileToGZip::DeflateL() method.

Class Summary

CZipFile

CZipFileMember

CZipFileMemberIterator

RZipFileMemberReaderStream

CEZGZipToFile

CEZFileToGZip

Build

The Symbian build -process describes how to build an application.

The EzlibExample builds -an executable file called ezlibexample.exe in the standard -location (\epoc32\release\winscw\ <build_variant > -for CodeWarrior). After launching the executable, depending on the emulator -you are using, you may need to navigate using the application launcher or -the eshell screen to view the console.

+ + + + + +EzlibExample: +Using EZLIB to Compress and Decompress Files +

This overview describes the example application that demonstrates the usage +of the EZLIB API.

Download

Click +on the following link to download the example: EzlibExample.zip

Click: browse to view the example code.

Description

EZLIB +is a utility API used to compress and decompress data. The API is an extension +of ZLIB compression library. For more information on ZLIB compression library, +refer to RFC1950.

This +example application uses the EZLIB API to extract files from a .zip and +a .gz file into specified folders, and to compress a .wav file +into a .gz file. The application reads input files and +stores the extracted files in c:\private\E80000B7\.

The +application uses an object of the RFs class to open the EzlibZipFolder.zip file. +It reads the properties of each file in the archive using the CZipFileMember object +and prints it to the console.

After reading all the properties of +each file in the archive, the application extracts all the files to the specified +folder using the CZipFile::GetInputStreamL() method.

Other +than extracting all the files in the archive, the application also searches +for a specific file using the CZipFile::CaseInsensitiveMemberL() method +and extracts it.

The application also opens the icon.bmp.gz file +and extracts its contents to the specified location. The GZip file is represented +by an object of the CEZGZipToFile class and its contents +are extracted using the CEZGZipToFile::InflateL() method.

Finally, +the application compresses the error.wav file to a .gz file. +The GZip file being created is represented by an object of the CEZFileToGZip class +and the .wav file is compressed using the CEZFileToGZip::DeflateL() method.