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# io ## Name io -- Input/output support. ## Functions
int | xmlSecIOInit ()
void | xmlSecIOShutdown ()
void | xmlSecIOCleanupCallbacks ()
int | xmlSecIORegisterDefaultCallbacks ()
int | xmlSecIORegisterCallbacks ()
xmlSecTransformId | xmlSecTransformInputURIGetKlass ()
int | xmlSecTransformInputURIOpen ()
int | xmlSecTransformInputURIClose ()
## Types and Values
#define | xmlSecTransformInputURIId
## Description Input/output support. ## Functions ### xmlSecIOInit ()
    int
    xmlSecIOInit (void);
The IO initialization (called from xmlSecInit function). Applications should not call this function directly. #### Returns 0 on success or a negative value otherwise. ### xmlSecIOShutdown ()
    void
    xmlSecIOShutdown (void);
The IO clenaup (called from xmlSecShutdown function). Applications should not call this function directly. ### xmlSecIOCleanupCallbacks ()
    void
    xmlSecIOCleanupCallbacks (void);
Clears the entire input callback table. this includes the compiled-in I/O. ### xmlSecIORegisterDefaultCallbacks ()
    int
    xmlSecIORegisterDefaultCallbacks (void);
Registers the default compiled-in I/O handlers. #### Returns 0 on success or a negative value otherwise. ### xmlSecIORegisterCallbacks ()
    int
    xmlSecIORegisterCallbacks (xmlInputMatchCallback matchFunc,
                               xmlInputOpenCallback openFunc,
                               xmlInputReadCallback readFunc,
                               xmlInputCloseCallback closeFunc);
Register a new set of I/O callback for handling parser input. #### Parameters
matchFunc | the protocol match callback. |
openFunc | the open stream callback. |
readFunc | the read from stream callback. |
closeFunc | the close stream callback. |
#### Returns the 0 on success or a negative value if an error occurs. ### xmlSecTransformInputURIGetKlass ()
    xmlSecTransformId
    xmlSecTransformInputURIGetKlass (void);
The input uri transform klass. Reads binary data from an uri. #### Returns input URI transform id. ### xmlSecTransformInputURIOpen ()
    int
    xmlSecTransformInputURIOpen (xmlSecTransformPtr transform,
                                 const xmlChar *uri);
Opens the given `uri` for reading. #### Parameters
transform | the pointer to IO transform. |
uri | the URL to open. |
#### Returns 0 on success or a negative value otherwise. ### xmlSecTransformInputURIClose ()
    int
    xmlSecTransformInputURIClose (xmlSecTransformPtr transform);
Closes the given `transform` and frees up resourses. #### Parameters
transform | the pointer to IO transform. |
#### Returns 0 on success or a negative value otherwise. ## Types and Values ### xmlSecTransformInputURIId
    #define             xmlSecTransformInputURIId
The Input URI transform id.