BufferedStreamReader

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BufferedStreamReader

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Delphi BufferedStreamReader

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- image1input.png
- image1input.ppm
- image2input.png
- image2input.ppm
- ppm2png.dpr
- ppm2png.dproj
- ppm2png.res
- PPMConverter.pas
- BufferedStreamReaderTests.dpr
- BufferedStreamReaderTests.dproj
- BufferedStreamReaderTests.res
- CustomTestCase.pas
- TestBufStream.pas
- TestBufStreamReader.pas
.gitignore
BufferedStreamDev.dpr
BufferedStreamDev.dproj
BufferedStreamDev.res
BufferedStreamReader.groupproj
BufStream.pas
BufStreamReader.pas
EncodingHelper.pas
LICENSE
README.md

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BufferedStreamReader
====================

A simple, buffered TStreamReader replacement for Delphi.

Unlike the TStreamReader in the RTL, it can be used to process any remaining 
data after reading some text. Due to the BufferedStream it is also 
significantly faster than TStreamReader, especially for doing many small reads
with large buffer sizes (>16KB).

Two classes are provided:

`BufferedStreamReader` class which takes a TStream and has methods to read 
text from the stream, as well as allowing for the unread (possibly binary) data 
to be processed further. It has methods to read a line, until a byte or 
string delimiter, or until the end of the stream.

`BufferedStream` class which acts as a read-only buffered TStream 
implementation which provides access to the buffer and has methods to
fill and consume the buffer. The position is tracked according to the consumed
bytes, so reading from the `BufferedStream` does not skip buffered data.

Dependencies
============

The `BufferedStreamReader` has a method `ReadUntil` taking a regular expression
for matching the delimiter. This function relies on my [RegularExpr][1] library,
which is a wrapper around PCRE using Delphi's own RegularExpressionsAPI unit,
included in XE2 and above.

If you do not wish to use this dependency you can define 
`BUFFEREDSTREAMREADER_NO_REGULAREXPR` in your project.

The test and example projects assume that the BufferedStreamReader and 
RegularExpr libraries share the same root folder, if this is not the case
remember to adjust the search paths in the respective project options.

Examples
========

`ppm2png` illustrates how to first parse an ASCII header and then convert the
binary data immediately following the header using the `BufferedStreamReader`.
The program converts PPM (Portable PixMaps) files to PNG files. The example
requires the RegularExpr dependency, as described above.

[1]: https://github.com/lordcrc/RegularExpr

BufferedStreamReader

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