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/* Author: Martin Povolny (xpovolny@fi.muni.cz) */
#include "ruby_libxml.h"
#include "ruby_xml_input_cbg.h"
/* Document-class: LibXML::XML::InputCallbacks
*
* Support for adding custom scheme handlers. */
static ic_scheme *first_scheme = 0;
int ic_match(char const *filename)
{
ic_scheme *scheme;
//fprintf( stderr, "ic_match: %s\n", filename );
scheme = first_scheme;
while (0 != scheme)
{
if (!xmlStrncasecmp(BAD_CAST filename, BAD_CAST scheme->scheme_name, scheme->name_len))
{
return 1;
}
scheme = scheme->next_scheme;
}
return 0;
}
void* ic_open(char const *filename)
{
ic_doc_context *ic_doc;
ic_scheme *scheme;
VALUE res;
scheme = first_scheme;
while (0 != scheme)
{
if (!xmlStrncasecmp(BAD_CAST filename, BAD_CAST scheme->scheme_name, scheme->name_len))
{
ic_doc = (ic_doc_context*) malloc(sizeof(ic_doc_context));
res = rb_funcall(scheme->class, rb_intern("document_query"), 1,
rb_str_new2(filename));
ic_doc->buffer = strdup(StringValuePtr(res));
ic_doc->bpos = ic_doc->buffer;
ic_doc->remaining = strlen(ic_doc->buffer);
return ic_doc;
}
scheme = scheme->next_scheme;
}
return 0;
}
int ic_read(void *context, char *buffer, int len)
{
ic_doc_context *ic_doc;
int ret_len;
ic_doc = (ic_doc_context*) context;
if (len >= ic_doc->remaining)
{
ret_len = ic_doc->remaining;
}
else
{
ret_len = len;
}
ic_doc->remaining -= ret_len;
strncpy(buffer, ic_doc->bpos, ret_len);
ic_doc->bpos += ret_len;
return ret_len;
}
int ic_close(void *context)
{
ruby_xfree(((ic_doc_context*) context)->buffer);
ruby_xfree(context);
return 1;
}
/*
* call-seq:
* register
*
* Register a new set of I/O callback for handling parser input.
*/
static VALUE input_callbacks_register_input_callbacks()
{
xmlRegisterInputCallbacks(ic_match, ic_open, ic_read, ic_close);
return (Qtrue);
}
/*
* call-seq:
* add_scheme
*
* No documentation available.
*/
static VALUE input_callbacks_add_scheme(VALUE self, VALUE scheme_name,
VALUE class)
{
ic_scheme *scheme;
Check_Type(scheme_name, T_STRING);
scheme = (ic_scheme*) malloc(sizeof(ic_scheme));
scheme->next_scheme = 0;
scheme->scheme_name = strdup(StringValuePtr(scheme_name)); /* TODO alloc, dealloc */
scheme->name_len = strlen(scheme->scheme_name);
scheme->class = class; /* TODO alloc, dealloc */
//fprintf( stderr, "registered: %s, %d, %s\n", scheme->scheme_name, scheme->name_len, scheme->class );
if (0 == first_scheme)
first_scheme = scheme;
else
{
ic_scheme *pos;
pos = first_scheme;
while (0 != pos->next_scheme)
pos = pos->next_scheme;
pos->next_scheme = scheme;
}
return (Qtrue);
}
/*
* call-seq:
* remove_scheme
*
* No documentation available.
*/
static VALUE input_callbacks_remove_scheme(VALUE self, VALUE scheme_name)
{
char *name;
ic_scheme *save_scheme, *scheme;
Check_Type(scheme_name, T_STRING);
name = StringValuePtr(scheme_name);
if (0 == first_scheme)
return Qfalse;
if (!strncmp(name, first_scheme->scheme_name, first_scheme->name_len))
{
save_scheme = first_scheme->next_scheme;
ruby_xfree(first_scheme->scheme_name);
ruby_xfree(first_scheme);
first_scheme = save_scheme;
return Qtrue;
}
scheme = first_scheme;
while (0 != scheme->next_scheme)
{
if (!strncmp(name, scheme->next_scheme->scheme_name,
scheme->next_scheme->name_len))
{
save_scheme = scheme->next_scheme->next_scheme;
ruby_xfree(scheme->next_scheme->scheme_name);
ruby_xfree(scheme->next_scheme);
scheme->next_scheme = save_scheme;
return Qtrue;
}
scheme = scheme->next_scheme;
}
return Qfalse;
}
void rxml_init_input_callbacks(void)
{
VALUE cInputCallbacks;
cInputCallbacks = rb_define_class_under(mXML, "InputCallbacks", rb_cObject);
/* Class Methods */
rb_define_singleton_method(cInputCallbacks, "register",
input_callbacks_register_input_callbacks, 0);
rb_define_singleton_method(cInputCallbacks, "add_scheme",
input_callbacks_add_scheme, 2);
rb_define_singleton_method(cInputCallbacks, "remove_scheme",
input_callbacks_remove_scheme, 1);
}
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