Ptv.XServer.Controls.Map.Tools.Reprojection Namespace

Adler-32 checksum calculation, initially taken from here: http://www.java2s.com/Code/CSharp/Security/ComputesAdler32checksumforastreamofdata.htm ----- original description ------------------------------------------------------------------ Computes Adler32 checksum for a stream of data. An Adler32 checksum is not as reliable as a CRC32 checksum, but a lot faster to compute. The specification for Adler32 may be found in RFC 1950. ZLIB Compressed Data Format Specification version 3.3) From that document: "ADLER32 (Adler-32 checksum) This contains a checksum value of the uncompressed data (excluding any dictionary data) computed according to Adler-32 algorithm. This algorithm is a 32-bit extension and improvement of the Fletcher algorithm, used in the ITU-T X.224 / ISO 8073 standard. Adler-32 is composed of two sums accumulated per byte: s1 is the sum of all bytes, s2 is the sum of all s1 values. Both sums are done modulo 65521. s1 is initialized to 1, s2 to zero. The Adler-32 checksum is stored as s2*65536 + s1 in most- significant-byte first (network) order." "8.2. The Adler-32 algorithm The Adler-32 algorithm is much faster than the CRC32 algorithm yet still provides an extremely low probability of undetected errors. The modulo on unsigned long accumulators can be delayed for 5552 bytes, so the modulo operation time is negligible. If the bytes are a, b, c, the second sum is 3a + 2b + c + 3, and so is position and order sensitive, unlike the first sum, which is just a checksum. That 65521 is prime is important to avoid a possible large class of two-byte errors that leave the check unchanged. (The Fletcher checksum uses 255, which is not prime and which also makes the Fletcher check insensitive to single byte changes 0 - 255.) The sum s1 is initialized to 1 instead of zero to make the length of the sequence part of s2, so that the length does not have to be checked separately. (Any sequence of zeroes has a Fletcher checksum of zero.)"

Represents an image in 32bpp ARGB format.

Provides extensions to ArgbImage.

Generic helper class that snapshots the position of a memory stream for checksum calculation of the data added afterwards.

Code for crc calculation, initially taken from here: http://www.w3.org/TR/PNG-CRCAppendix.html TODO: could we use .NET's crc implementation instead of this?

An class providing methods for image re-projection.

Class encapsulating a service that delivers map images.

Static class providing some extensions.

Class encapsulating the options for image re-projection.

This class represents map service adding re-projection to another one.

Encapsulates the options for ReprojectionService.

Class encapsulating a WMS service.

Defines the placeholders names for WMS requests made by WmsMapService.

Simple structure describing a bounding box with the four line strings on the left, right, top and bottom side of the box. See remarks.

Encapsulates a rectangle. Extends the bounding box with an orientation by defining the bounds of an object through the properties Left, Top, Right and Bottom.

Encapsulates the coordinates of a target block in image re-projection.

Represents the bounding box of an object.

Extended base interface of a service that delivers map images.

Base interface of a service that delivers map images.

Delegate used by WmsMapServer; used for request customization.