tiny_dlna::XMLAttributeParser Class Reference

Small utility to extract attributes from a start-tag in an XML fragment. More...

#include <XMLAttributeParser.h>

Static Public Member Functions
static bool	extractAttribute (const char *xml, const char *tagName, const char *attrName, char *outBuf, size_t bufSize)
	Find the first occurrence of a start-tag and extract an attribute value.
static bool	extractAttributeToken (const char *xml, const char *tagName, const char *attrName, int n, char *outBuf, size_t bufSize)
	Extract the nth (1-based) colon-separated token from an attribute value located on the first occurrence of tagName.

Detailed Description

Small utility to extract attributes from a start-tag in an XML fragment.

This helper does not attempt full XML validation but is suitable for small embedded parsing tasks (for example: extracting the protocolInfo attribute from a DIDL-Lite <res ...> element).

Member Function Documentation

extractAttribute()

static bool tiny_dlna::XMLAttributeParser::extractAttribute ( const char *  xml, const char *  tagName, const char *  attrName, char *  outBuf, size_t  bufSize  )

inlinestatic

Find the first occurrence of a start-tag and extract an attribute value.

This searches for the first occurrence of tagName (for example "<res") in xml and looks for the attribute named attrName inside that tag. If found, the attribute value (the text between the surrounding double quotes) is copied into outBuf (null-terminated).

Parameters

xml	Pointer to a null-terminated XML fragment to search.
tagName	Start-tag to locate (e.g. "<res").
attrName	Attribute name to extract (e.g. "protocolInfo" or "protocolInfo="). The function expects a double-quoted value (attrName="...").
outBuf	Destination buffer where the extracted value will be written (null-terminated). Must be non-null.
bufSize	Size of outBuf in bytes; if the attribute value is longer than bufSize - 1 it will be truncated.

Returns

true if a non-empty attribute value was found and written into outBuf, false otherwise (invalid inputs, tag/attribute not found, malformed tag).

extractAttributeToken()

static bool tiny_dlna::XMLAttributeParser::extractAttributeToken ( const char *  xml, const char *  tagName, const char *  attrName, int  n, char *  outBuf, size_t  bufSize  )

inlinestatic

Extract the nth (1-based) colon-separated token from an attribute value located on the first occurrence of tagName.

This helper locates tagName (for example "<res") and extracts the value of attrName (expects a double-quoted value). The attribute value is split on ':' characters and the nth token (1-based) is copied into outBuf.

Parameters

xml	Pointer to a null-terminated XML fragment to search.
tagName	Start-tag to locate (e.g. "<res"). Only the first occurrence is scanned.
attrName	Attribute name to extract (with or without trailing '='). The function expects a double-quoted value.
n	1-based index of the colon-separated token to return.
outBuf	Destination buffer where the token will be written (null-terminated). Must be non-null.
bufSize	Size of outBuf in bytes; if the token is longer than bufSize - 1 it will be truncated.

Returns

true if the requested token was found and written into outBuf, false otherwise (invalid inputs, tag/attribute not found, index out of range).

Example: attrName = "protocolInfo" (or "protocolInfo="), n = 3 protocolInfo="http-get:*:audio/mpeg:*" -> returns "audio/mpeg".

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The documentation for this class was generated from the following file:

• src/dlna/xml/XMLAttributeParser.h