.NODE

Manipulation

Four of the five static wrapper operations handle non-I/O based manipulation of streamable resources. You've already seen what they are and how their prototypes look; now it's time to implement them within the framework of the varstream wrapper.

unlink

Add the following function, which allows unlink() to behave much like unset() when used with the varstream wrapper anywhere above your wrapper_ops structure:

static int php_varstream_unlink(php_stream_wrapper *wrapper,
 char *filename, int options,
 php_stream_context *context
 TSRMLS_DC)
{
 php_url *url;

 url = php_url_parse(filename);
 if (!url) {
 php_stream_wrapper_log_error(wrapper, options
 TSRMLS_CC, "Unexpected error parsing URL");
 return -1;
 }
 if (!url->host || (url->host[0] == 0) ||
 strcasecmp("var", url->scheme) != 0) {
 /* Bad URL or wrong wrapper */
 php_stream_wrapper_log_error(wrapper, options
 TSRMLS_CC, "Invalid URL, must be in the form: "
 "var://variablename");
 php_url_free(url);
 return -1;
 }

 /* Delete it */
 zend_hash_del(&EG(symbol_table), url->host,
 strlen(url->host) + 1);
 php_url_free(url);
 return 0;
}

The bulk of this function should look familiar as it's taken straight out of php_varstream_opener. The only difference is that this time you've passed the variable name to zend_hash_del instead.

rename, mkdir, and rmdir

Just for completeness, here are implementations of the rename, mkdir, and rmdir methods:

static int php_varstream_rename(php_stream_wrapper *wrapper,
 char *url_from, char *url_to, int options,
 php_stream_context *context TSRMLS_DC)
{
 php_url *from, *to;
 zval **var;

 from = php_url_parse(url_from);
 if (!from) {
 php_stream_wrapper_log_error(wrapper, options
 TSRMLS_CC, "Unexpected error parsing source");
 return -1;
 }
 if (zend_hash_find(&EG(symbol_table), from->host,
 strlen(from->host) + 1,
 (void**)&var) == FAILURE) {
 php_stream_wrapper_log_error(wrapper, options
 TSRMLS_CC, "$%s does not exist", from->host);
 php_url_free(from);
 return -1;
 }
 to = php_url_parse(url_to);
 if (!to) {
 php_stream_wrapper_log_error(wrapper, options
 TSRMLS_CC, "Unexpected error parsing dest");
 php_url_free(from);
 return -1;
 }
 ZVAL_ADDREF(*var);
 zend_hash_update(&EG(symbol_table), to->host,
 strlen(to->host) + 1, (void*)var,
 sizeof(zval*), NULL);
 zend_hash_del(&EG(symbol_table), from->host,
 strlen(from->host) + 1);
 php_url_free(from);
 php_url_free(to);
 return 0;
}

static int php_varstream_mkdir(php_stream_wrapper *wrapper,
 char *url_from, int mode, int options,
 php_stream_context *context TSRMLS_DC)
{
 php_url *url;

 php_url_parse(url_from);
 if (!url) {
 php_stream_wrapper_log_error(wrapper, options
 TSRMLS_CC, "Unexpected error parsing URL");
 return -1;
 }

 if (zend_hash_exists(&EG(symbol_table), url->host,
 strlen(url->host) + 1)) {
 php_stream_wrapper_log_error(wrapper, options
 TSRMLS_CC, "$%s already exists", url->host);
 php_url_free(url);
 return -1;
 }
 /* EG(uninitialized_zval_ptr) is a general purpose
 * IS_NULL zval* with an unlimited refcount */
 zend_hash_add(&EG(symbol_table), url->host,
 strlen(url->host) + 1,
 (void*)&EG(uninitialized_zval_ptr),
 sizeof(zval*), NULL);
 php_url_free(url);
 return 0;
}

static int php_varstream_rmdir(php_stream_wrapper *wrapper,
 char *url, int options,
 php_stream_context *context TSRMLS_DC)
{
 /* Act just like unlink() */
 wrapper->wops->unlink(wrapper, url, options,
 context TSRMLS_CC);
}


The PHP Life Cycle

Variables from the Inside Out

Memory Management

Setting Up a Build Environment

Your First Extension

Returning Values

Accepting Parameters

Working with Arrays and HashTables

The Resource Data Type

PHP4 Objects

PHP5 Objects

Startup, Shutdown, and a Few Points in Between

INI Settings

Accessing Streams

Implementing Streams

Diverting the Stream

Configuration and Linking

Extension Generators

Setting Up a Host Environment

Advanced Embedding

Appendix A. A Zend API Reference

Appendix B. PHPAPI

Appendix C. Extending and Embedding Cookbook

Appendix D. Additional Resources





Extending and Embedding PHP
Extending and Embedding PHP
ISBN: 067232704X
EAN: 2147483647
Year: 2007
Pages: 175
Authors: Sara Golemon
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