Class Poco::Zip::PartialStreamBuf
Author: Applied Informatics Software Engineering GmbH and Contributors
Date: 2009-11-24

# Poco::Zip

# class PartialStreamBuf

Library: Zip
Package: Zip
Header: Poco/Zip/PartialStream.h

## Description

A PartialStreamBuf is a class that limits one view on an inputstream to a selected view range

## Inheritance

Direct Base Classes: Poco::BufferedStreamBuf

All Base Classes: Poco::BufferedStreamBuf

## Member Summary

Member Functions: bytesWritten, close, readFromDevice, writeToDevice

## Constructors

### PartialStreamBuf

PartialStreamBuf(
std::ostream & out,
std::size_t start,
std::size_t end,
bool initStream
);

Creates the PartialStream. If initStream is true the status of the stream will be cleared on the first access. start and end acts as offset values for the written content. A start value greater than zero, means that the first bytes are not written but discarded instead, an end value not equal to zero means that the last end bytes are not written! Examples:

    start = 3; end = 1
    write("hello", 5) -> "l"

### PartialStreamBuf

PartialStreamBuf(
std::istream & in,
std::ios::pos_type start,
std::ios::pos_type end,
const std::string & prefix,
const std::string & postfix,
bool initStream
);

Creates the PartialStream. If initStream is true the status of the stream will be cleared on the first access, and the stream will be repositioned to position start

## Destructor

### ~PartialStreamBuf

~PartialStreamBuf();

Destroys the PartialStream.

## Member Functions

### bytesWritten

Poco::UInt64 bytesWritten() const;

### close

void close();

Flushes a writing streambuf

### readFromDevice

int readFromDevice(
char * buffer,
std::streamsize length
);

### writeToDevice

int writeToDevice(
const char * buffer,
std::streamsize length
);