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.

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.

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