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1592 lines (1392 loc) · 48.3 KB
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/*
+----------------------------------------------------------------------+
| Copyright © The PHP Group and Contributors. |
+----------------------------------------------------------------------+
| This source file is subject to the Modified BSD License that is |
| bundled with this package in the file LICENSE, and is available |
| through the World Wide Web at <https://www.php.net/license/>. |
| |
| SPDX-License-Identifier: BSD-3-Clause |
+----------------------------------------------------------------------+
| Authors: Zeev Suraski <zeev@php.net> |
| Thies C. Arntzen <thies@thieso.net> |
| Marcus Boerger <helly@php.net> |
| New API: Michael Wallner <mike@php.net> |
+----------------------------------------------------------------------+
*/
#ifndef PHP_OUTPUT_DEBUG
# define PHP_OUTPUT_DEBUG 0
#endif
#ifndef PHP_OUTPUT_NOINLINE
# define PHP_OUTPUT_NOINLINE 0
#endif
#include "php.h"
#include "ext/standard/head.h"
#include "ext/standard/url_scanner_ex.h"
#include "SAPI.h"
#include "zend_stack.h"
#include "php_output.h"
PHPAPI ZEND_DECLARE_MODULE_GLOBALS(output)
const char php_output_default_handler_name[sizeof("default output handler")] = "default output handler";
const char php_output_devnull_handler_name[sizeof("null output handler")] = "null output handler";
#if PHP_OUTPUT_NOINLINE || PHP_OUTPUT_DEBUG
# undef inline
# define inline
#endif
/* {{{ aliases, conflict and reverse conflict hash tables */
static HashTable php_output_handler_aliases;
static HashTable php_output_handler_conflicts;
static HashTable php_output_handler_reverse_conflicts;
/* }}} */
/* {{{ forward declarations */
static inline bool php_output_lock_error(int op);
static inline void php_output_op(int op, const char *str, size_t len);
static inline php_output_handler *php_output_handler_init(zend_string *name, size_t chunk_size, int flags);
static inline php_output_handler_status_t php_output_handler_op(php_output_handler *handler, php_output_context *context);
static inline bool php_output_handler_append(php_output_handler *handler, const php_output_buffer *buf);
static inline zval *php_output_handler_status(php_output_handler *handler, zval *entry);
static inline void php_output_context_init(php_output_context *context, int op);
static inline void php_output_context_reset(php_output_context *context);
static inline void php_output_context_swap(php_output_context *context);
static inline void php_output_context_dtor(php_output_context *context);
static int php_output_stack_pop(int flags);
static int php_output_stack_apply_op(void *h, void *c);
static int php_output_stack_apply_clean(void *h, void *c);
static int php_output_stack_apply_list(void *h, void *z);
static int php_output_stack_apply_status(void *h, void *z);
static zend_result php_output_handler_compat_func(void **handler_context, php_output_context *output_context);
static zend_result php_output_handler_default_func(void **handler_context, php_output_context *output_context);
static zend_result php_output_handler_devnull_func(void **handler_context, php_output_context *output_context);
/* }}} */
/* {{{ static void php_output_init_globals(zend_output_globals *G)
* Initialize the module globals on MINIT */
static inline void php_output_init_globals(zend_output_globals *G)
{
memset(G, 0, sizeof(*G));
}
/* }}} */
/* {{{ stderr/stdout writer if not PHP_OUTPUT_ACTIVATED */
static size_t php_output_stdout(const char *str, size_t str_len)
{
fwrite(str, 1, str_len, stdout);
return str_len;
}
static size_t php_output_stderr(const char *str, size_t str_len)
{
fwrite(str, 1, str_len, stderr);
/* See http://support.microsoft.com/kb/190351 */
#ifdef PHP_WIN32
fflush(stderr);
#endif
return str_len;
}
static size_t (*php_output_direct)(const char *str, size_t str_len) = php_output_stderr;
/* }}} */
/* {{{ void php_output_header(void) */
static void php_output_header(void)
{
if (!SG(headers_sent)) {
if (!OG(output_start_filename)) {
if (zend_is_compiling()) {
OG(output_start_filename) = zend_get_compiled_filename();
OG(output_start_lineno) = zend_get_compiled_lineno();
} else if (zend_is_executing()) {
OG(output_start_filename) = zend_get_executed_filename_ex();
OG(output_start_lineno) = zend_get_executed_lineno();
}
if (OG(output_start_filename)) {
zend_string_addref(OG(output_start_filename));
}
#if PHP_OUTPUT_DEBUG
fprintf(stderr, "!!! output started at: %s (%d)\n",
ZSTR_VAL(OG(output_start_filename)), OG(output_start_lineno));
#endif
}
if (!php_header()) {
OG(flags) |= PHP_OUTPUT_DISABLED;
}
}
}
/* }}} */
static void reverse_conflict_dtor(zval *zv)
{
HashTable *ht = Z_PTR_P(zv);
zend_hash_destroy(ht);
}
/* {{{ void php_output_startup(void)
* Set up module globals and initialize the conflict and reverse conflict hash tables */
PHPAPI void php_output_startup(void)
{
ZEND_INIT_MODULE_GLOBALS(output, php_output_init_globals, NULL);
zend_hash_init(&php_output_handler_aliases, 8, NULL, NULL, 1);
zend_hash_init(&php_output_handler_conflicts, 8, NULL, NULL, 1);
zend_hash_init(&php_output_handler_reverse_conflicts, 8, NULL, reverse_conflict_dtor, 1);
php_output_direct = php_output_stdout;
}
/* }}} */
/* {{{ void php_output_shutdown(void)
* Destroy module globals and the conflict and reverse conflict hash tables */
PHPAPI void php_output_shutdown(void)
{
php_output_direct = php_output_stderr;
zend_hash_destroy(&php_output_handler_aliases);
zend_hash_destroy(&php_output_handler_conflicts);
zend_hash_destroy(&php_output_handler_reverse_conflicts);
}
/* }}} */
/* {{{ SUCCESS|FAILURE php_output_activate(void)
* Reset output globals and set up the output handler stack */
PHPAPI int php_output_activate(void)
{
#ifdef ZTS
memset(TSRMG_BULK_STATIC(output_globals_id, zend_output_globals*), 0, sizeof(zend_output_globals));
#else
memset(&output_globals, 0, sizeof(zend_output_globals));
#endif
zend_stack_init(&OG(handlers), sizeof(php_output_handler *));
OG(flags) |= PHP_OUTPUT_ACTIVATED;
return SUCCESS;
}
/* }}} */
/* {{{ void php_output_deactivate(void)
* Destroy the output handler stack */
PHPAPI void php_output_deactivate(void)
{
php_output_handler **handler = NULL;
if ((OG(flags) & PHP_OUTPUT_ACTIVATED)) {
php_output_header();
OG(flags) ^= PHP_OUTPUT_ACTIVATED;
OG(active) = NULL;
OG(running) = NULL;
/* release all output handlers */
if (OG(handlers).elements) {
while ((handler = zend_stack_top(&OG(handlers)))) {
zend_stack_del_top(&OG(handlers));
/* It's possible to start a new output handler and mark it as active,
* however this loop will destroy all active handlers. */
OG(active) = NULL;
ZEND_ASSERT(OG(running) == NULL && "output is deactivated therefore running should stay NULL");
php_output_handler_free(handler);
}
}
zend_stack_destroy(&OG(handlers));
}
if (OG(output_start_filename)) {
zend_string_release(OG(output_start_filename));
OG(output_start_filename) = NULL;
}
}
/* }}} */
/* {{{ void php_output_set_status(int status)
* Used by SAPIs to disable output */
PHPAPI void php_output_set_status(int status)
{
OG(flags) = (OG(flags) & ~0xf) | (status & 0xf);
}
/* }}} */
/* {{{ int php_output_get_status()
* Get output control status */
PHPAPI int php_output_get_status(void)
{
return (
OG(flags)
| (OG(active) ? PHP_OUTPUT_ACTIVE : 0)
| (OG(running)? PHP_OUTPUT_LOCKED : 0)
) & 0xff;
}
/* }}} */
/* {{{ int php_output_write_unbuffered(const char *str, size_t len)
* Unbuffered write */
PHPAPI size_t php_output_write_unbuffered(const char *str, size_t len)
{
if (OG(flags) & PHP_OUTPUT_ACTIVATED) {
return sapi_module.ub_write(str, len);
}
return php_output_direct(str, len);
}
/* }}} */
/* {{{ int php_output_write(const char *str, size_t len)
* Buffered write */
PHPAPI size_t php_output_write(const char *str, size_t len)
{
if (OG(flags) & PHP_OUTPUT_ACTIVATED) {
php_output_op(PHP_OUTPUT_HANDLER_WRITE, str, len);
return len;
}
if (OG(flags) & PHP_OUTPUT_DISABLED) {
return 0;
}
return php_output_direct(str, len);
}
/* }}} */
/* {{{ SUCCESS|FAILURE php_output_flush(void)
* Flush the most recent output handlers buffer */
PHPAPI zend_result php_output_flush(void)
{
php_output_context context;
if (OG(active) && (OG(active)->flags & PHP_OUTPUT_HANDLER_FLUSHABLE)) {
php_output_context_init(&context, PHP_OUTPUT_HANDLER_FLUSH);
php_output_handler_op(OG(active), &context);
if (context.out.data && context.out.used) {
zend_stack_del_top(&OG(handlers));
php_output_write(context.out.data, context.out.used);
zend_stack_push(&OG(handlers), &OG(active));
}
php_output_context_dtor(&context);
return SUCCESS;
}
return FAILURE;
}
/* }}} */
/* {{{ void php_output_flush_all()
* Flush all output buffers subsequently */
PHPAPI void php_output_flush_all(void)
{
if (OG(active)) {
php_output_op(PHP_OUTPUT_HANDLER_FLUSH, NULL, 0);
}
}
/* }}} */
/* {{{ SUCCESS|FAILURE php_output_clean(void)
* Cleans the most recent output handlers buffer if the handler is cleanable */
PHPAPI zend_result php_output_clean(void)
{
php_output_context context;
if (OG(active) && (OG(active)->flags & PHP_OUTPUT_HANDLER_CLEANABLE)) {
php_output_context_init(&context, PHP_OUTPUT_HANDLER_CLEAN);
php_output_handler_op(OG(active), &context);
php_output_context_dtor(&context);
return SUCCESS;
}
return FAILURE;
}
/* }}} */
/* {{{ void php_output_clean_all(void)
* Cleans all output handler buffers, without regard whether the handler is cleanable */
PHPAPI void php_output_clean_all(void)
{
php_output_context context;
if (OG(active)) {
php_output_context_init(&context, PHP_OUTPUT_HANDLER_CLEAN);
zend_stack_apply_with_argument(&OG(handlers), ZEND_STACK_APPLY_TOPDOWN, php_output_stack_apply_clean, &context);
}
}
/* {{{ SUCCESS|FAILURE php_output_end(void)
* Finalizes the most recent output handler at pops it off the stack if the handler is removable */
PHPAPI zend_result php_output_end(void)
{
if (php_output_stack_pop(PHP_OUTPUT_POP_TRY)) {
return SUCCESS;
}
return FAILURE;
}
/* }}} */
/* {{{ void php_output_end_all(void)
* Finalizes all output handlers and ends output buffering without regard whether a handler is removable */
PHPAPI void php_output_end_all(void)
{
while (OG(active) && php_output_stack_pop(PHP_OUTPUT_POP_FORCE));
}
/* }}} */
/* {{{ SUCCESS|FAILURE php_output_discard(void)
* Discards the most recent output handlers buffer and pops it off the stack if the handler is removable */
PHPAPI zend_result php_output_discard(void)
{
if (php_output_stack_pop(PHP_OUTPUT_POP_DISCARD|PHP_OUTPUT_POP_TRY)) {
return SUCCESS;
}
return FAILURE;
}
/* }}} */
/* {{{ void php_output_discard_all(void)
* Discard all output handlers and buffers without regard whether a handler is removable */
PHPAPI void php_output_discard_all(void)
{
while (OG(active)) {
php_output_stack_pop(PHP_OUTPUT_POP_DISCARD|PHP_OUTPUT_POP_FORCE);
}
}
/* }}} */
/* {{{ int php_output_get_level(void)
* Get output buffering level, i.e. how many output handlers the stack contains */
PHPAPI int php_output_get_level(void)
{
return OG(active) ? zend_stack_count(&OG(handlers)) : 0;
}
/* }}} */
/* {{{ SUCCESS|FAILURE php_output_get_contents(zval *z)
* Get the contents of the active output handlers buffer */
PHPAPI zend_result php_output_get_contents(zval *p)
{
if (OG(active)) {
if (OG(active)->buffer.used) {
ZVAL_STRINGL(p, OG(active)->buffer.data, OG(active)->buffer.used);
} else {
ZVAL_EMPTY_STRING(p);
}
return SUCCESS;
} else {
ZVAL_NULL(p);
return FAILURE;
}
}
/* {{{ SUCCESS|FAILURE php_output_get_length(zval *z)
* Get the length of the active output handlers buffer */
PHPAPI zend_result php_output_get_length(zval *p)
{
if (OG(active)) {
ZVAL_LONG(p, OG(active)->buffer.used);
return SUCCESS;
} else {
ZVAL_NULL(p);
return FAILURE;
}
}
/* }}} */
/* {{{ php_output_handler* php_output_get_active_handler(void)
* Get active output handler */
PHPAPI php_output_handler* php_output_get_active_handler(void)
{
return OG(active);
}
/* }}} */
/* {{{ SUCCESS|FAILURE php_output_handler_start_default(void)
* Start a "default output handler" */
PHPAPI zend_result php_output_start_default(void)
{
php_output_handler *handler;
handler = php_output_handler_create_internal(ZEND_STRL(php_output_default_handler_name), php_output_handler_default_func, 0, PHP_OUTPUT_HANDLER_STDFLAGS);
if (SUCCESS == php_output_handler_start(handler)) {
return SUCCESS;
}
php_output_handler_free(&handler);
return FAILURE;
}
/* }}} */
/* {{{ SUCCESS|FAILURE php_output_handler_start_devnull(void)
* Start a "null output handler" */
PHPAPI zend_result php_output_start_devnull(void)
{
php_output_handler *handler;
handler = php_output_handler_create_internal(ZEND_STRL(php_output_devnull_handler_name), php_output_handler_devnull_func, PHP_OUTPUT_HANDLER_DEFAULT_SIZE, 0);
if (SUCCESS == php_output_handler_start(handler)) {
return SUCCESS;
}
php_output_handler_free(&handler);
return FAILURE;
}
/* }}} */
/* {{{ SUCCESS|FAILURE php_output_start_user(zval *handler, size_t chunk_size, int flags)
* Start a user level output handler */
PHPAPI zend_result php_output_start_user(zval *output_handler, size_t chunk_size, int flags)
{
php_output_handler *handler;
if (output_handler) {
handler = php_output_handler_create_user(output_handler, chunk_size, flags);
} else {
handler = php_output_handler_create_internal(ZEND_STRL(php_output_default_handler_name), php_output_handler_default_func, chunk_size, flags);
}
if (SUCCESS == php_output_handler_start(handler)) {
return SUCCESS;
}
php_output_handler_free(&handler);
return FAILURE;
}
/* }}} */
/* {{{ SUCCESS|FAILURE php_output_start_internal(zval *name, php_output_handler_func_t handler, size_t chunk_size, int flags)
* Start an internal output handler that does not have to maintain a non-global state */
PHPAPI zend_result php_output_start_internal(const char *name, size_t name_len, php_output_handler_func_t output_handler, size_t chunk_size, int flags)
{
php_output_handler *handler;
handler = php_output_handler_create_internal(name, name_len, php_output_handler_compat_func, chunk_size, flags);
php_output_handler_set_context(handler, output_handler, NULL);
if (SUCCESS == php_output_handler_start(handler)) {
return SUCCESS;
}
php_output_handler_free(&handler);
return FAILURE;
}
/* }}} */
/* {{{ php_output_handler *php_output_handler_create_user(zval *handler, size_t chunk_size, int flags)
* Create a user level output handler */
PHPAPI php_output_handler *php_output_handler_create_user(zval *output_handler, size_t chunk_size, int flags)
{
zend_string *handler_name = NULL;
char *error = NULL;
php_output_handler *handler = NULL;
php_output_handler_alias_ctor_t alias = NULL;
switch (Z_TYPE_P(output_handler)) {
case IS_NULL:
handler = php_output_handler_create_internal(ZEND_STRL(php_output_default_handler_name), php_output_handler_default_func, chunk_size, flags);
break;
case IS_STRING:
if (Z_STRLEN_P(output_handler) && (alias = php_output_handler_alias(Z_STRVAL_P(output_handler), Z_STRLEN_P(output_handler)))) {
handler = alias(Z_STRVAL_P(output_handler), Z_STRLEN_P(output_handler), chunk_size, flags);
break;
}
ZEND_FALLTHROUGH;
default: {
zend_fcall_info_cache *fcc = ecalloc(1, sizeof(*fcc));
if (zend_is_callable_ex(output_handler, NULL, 0, &handler_name, fcc, &error)) {
handler = php_output_handler_init(handler_name, chunk_size, PHP_OUTPUT_HANDLER_ABILITY_FLAGS(flags) | PHP_OUTPUT_HANDLER_USER);
zend_fcc_addref(fcc);
handler->func.user_fcc = fcc;
} else {
efree(fcc);
ZEND_ASSERT(error);
php_error_docref("ref.outcontrol", E_WARNING, "%s", error);
efree(error);
}
if (handler_name) {
zend_string_release_ex(handler_name, 0);
}
}
}
return handler;
}
/* }}} */
/* {{{ php_output_handler *php_output_handler_create_internal(zval *name, php_output_handler_context_func_t handler, size_t chunk_size, int flags)
* Create an internal output handler that can maintain a non-global state */
PHPAPI php_output_handler *php_output_handler_create_internal(const char *name, size_t name_len, php_output_handler_context_func_t output_handler, size_t chunk_size, int flags)
{
php_output_handler *handler;
zend_string *str = zend_string_init(name, name_len, 0);
handler = php_output_handler_init(str, chunk_size, PHP_OUTPUT_HANDLER_ABILITY_FLAGS(flags) | PHP_OUTPUT_HANDLER_INTERNAL);
handler->func.internal = output_handler;
zend_string_release_ex(str, 0);
return handler;
}
/* }}} */
/* {{{ void php_output_handler_set_context(php_output_handler *handler, void *opaq, void (*dtor)(void*))
* Set the context/state of an output handler. Calls the dtor of the previous context if there is one */
PHPAPI void php_output_handler_set_context(php_output_handler *handler, void *opaq, void (*dtor)(void*))
{
if (handler->dtor && handler->opaq) {
handler->dtor(handler->opaq);
}
handler->dtor = dtor;
handler->opaq = opaq;
}
/* }}} */
/* {{{ SUCCESS|FAILURE php_output_handler_start(php_output_handler *handler)
* Starts the set up output handler and pushes it on top of the stack. Checks for any conflicts regarding the output handler to start */
PHPAPI zend_result php_output_handler_start(php_output_handler *handler)
{
HashTable *rconflicts;
php_output_handler_conflict_check_t conflict;
if (!(OG(flags) & PHP_OUTPUT_ACTIVATED)) {
return FAILURE;
}
if (php_output_lock_error(PHP_OUTPUT_HANDLER_START) || !handler) {
return FAILURE;
}
if (NULL != (conflict = zend_hash_find_ptr(&php_output_handler_conflicts, handler->name))) {
if (SUCCESS != conflict(ZSTR_VAL(handler->name), ZSTR_LEN(handler->name))) {
return FAILURE;
}
}
if (NULL != (rconflicts = zend_hash_find_ptr(&php_output_handler_reverse_conflicts, handler->name))) {
ZEND_HASH_PACKED_FOREACH_PTR(rconflicts, conflict) {
if (SUCCESS != conflict(ZSTR_VAL(handler->name), ZSTR_LEN(handler->name))) {
return FAILURE;
}
} ZEND_HASH_FOREACH_END();
}
/* zend_stack_push returns stack level */
handler->level = zend_stack_push(&OG(handlers), &handler);
OG(active) = handler;
return SUCCESS;
}
/* }}} */
/* {{{ bool php_output_handler_started(zval *name)
* Check whether a certain output handler is in use */
PHPAPI bool php_output_handler_started(const char *name, size_t name_len)
{
php_output_handler **handlers;
int i, count = php_output_get_level();
if (count) {
handlers = (php_output_handler **) zend_stack_base(&OG(handlers));
for (i = 0; i < count; ++i) {
if (zend_string_equals_cstr(handlers[i]->name, name, name_len)) {
return true;
}
}
}
return false;
}
/* }}} */
/* {{{ bool php_output_handler_conflict(zval *handler_new, zval *handler_old)
* Check whether a certain handler is in use and issue a warning that the new handler would conflict with the already used one */
PHPAPI bool php_output_handler_conflict(const char *handler_new, size_t handler_new_len, const char *handler_set, size_t handler_set_len)
{
if (php_output_handler_started(handler_set, handler_set_len)) {
if (handler_new_len != handler_set_len || memcmp(handler_new, handler_set, handler_set_len)) {
php_error_docref("ref.outcontrol", E_WARNING, "Output handler '%s' conflicts with '%s'", handler_new, handler_set);
} else {
php_error_docref("ref.outcontrol", E_WARNING, "Output handler '%s' cannot be used twice", handler_new);
}
return true;
}
return false;
}
/* }}} */
/* {{{ SUCCESS|FAILURE php_output_handler_conflict_register(zval *name, php_output_handler_conflict_check_t check_func)
* Register a conflict checking function on MINIT */
PHPAPI zend_result php_output_handler_conflict_register(const char *name, size_t name_len, php_output_handler_conflict_check_t check_func)
{
zend_string *str;
if (!EG(current_module)) {
zend_error_noreturn(E_ERROR, "Cannot register an output handler conflict outside of MINIT");
}
str = zend_string_init_interned(name, name_len, 1);
zend_hash_update_ptr(&php_output_handler_conflicts, str, check_func);
zend_string_release_ex(str, 1);
return SUCCESS;
}
/* }}} */
/* {{{ SUCCESS|FAILURE php_output_handler_reverse_conflict_register(zval *name, php_output_handler_conflict_check_t check_func)
* Register a reverse conflict checking function on MINIT */
PHPAPI zend_result php_output_handler_reverse_conflict_register(const char *name, size_t name_len, php_output_handler_conflict_check_t check_func)
{
HashTable rev, *rev_ptr = NULL;
if (!EG(current_module)) {
zend_error_noreturn(E_ERROR, "Cannot register a reverse output handler conflict outside of MINIT");
}
if (NULL != (rev_ptr = zend_hash_str_find_ptr(&php_output_handler_reverse_conflicts, name, name_len))) {
return zend_hash_next_index_insert_ptr(rev_ptr, check_func) ? SUCCESS : FAILURE;
} else {
zend_string *str;
zend_hash_init(&rev, 8, NULL, NULL, 1);
if (NULL == zend_hash_next_index_insert_ptr(&rev, check_func)) {
zend_hash_destroy(&rev);
return FAILURE;
}
str = zend_string_init_interned(name, name_len, 1);
zend_hash_update_mem(&php_output_handler_reverse_conflicts, str, &rev, sizeof(HashTable));
zend_string_release_ex(str, 1);
return SUCCESS;
}
}
/* }}} */
/* {{{ php_output_handler_alias_ctor_t php_output_handler_alias(zval *name)
* Get an internal output handler for a user handler if it exists */
PHPAPI php_output_handler_alias_ctor_t php_output_handler_alias(const char *name, size_t name_len)
{
return zend_hash_str_find_ptr(&php_output_handler_aliases, name, name_len);
}
/* }}} */
/* {{{ SUCCESS|FAILURE php_output_handler_alias_register(zval *name, php_output_handler_alias_ctor_t func)
* Registers an internal output handler as alias for a user handler */
PHPAPI zend_result php_output_handler_alias_register(const char *name, size_t name_len, php_output_handler_alias_ctor_t func)
{
zend_string *str;
if (!EG(current_module)) {
zend_error_noreturn(E_ERROR, "Cannot register an output handler alias outside of MINIT");
}
str = zend_string_init_interned(name, name_len, 1);
zend_hash_update_ptr(&php_output_handler_aliases, str, func);
zend_string_release_ex(str, 1);
return SUCCESS;
}
/* }}} */
/* {{{ SUCCESS|FAILURE php_output_handler_hook(php_output_handler_hook_t type, void *arg)
* Output handler hook for output handler functions to check/modify the current handlers abilities */
PHPAPI zend_result php_output_handler_hook(php_output_handler_hook_t type, void *arg)
{
if (OG(running)) {
switch (type) {
case PHP_OUTPUT_HANDLER_HOOK_GET_OPAQ:
*(void ***) arg = &OG(running)->opaq;
return SUCCESS;
case PHP_OUTPUT_HANDLER_HOOK_GET_FLAGS:
*(int *) arg = OG(running)->flags;
return SUCCESS;
case PHP_OUTPUT_HANDLER_HOOK_GET_LEVEL:
*(int *) arg = OG(running)->level;
return SUCCESS;
case PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE:
OG(running)->flags &= ~(PHP_OUTPUT_HANDLER_REMOVABLE|PHP_OUTPUT_HANDLER_CLEANABLE);
return SUCCESS;
case PHP_OUTPUT_HANDLER_HOOK_DISABLE:
OG(running)->flags |= PHP_OUTPUT_HANDLER_DISABLED;
return SUCCESS;
default:
break;
}
}
return FAILURE;
}
/* }}} */
/* {{{ void php_output_handler_dtor(php_output_handler *handler)
* Destroy an output handler */
PHPAPI void php_output_handler_dtor(php_output_handler *handler)
{
if (handler->name) {
zend_string_release_ex(handler->name, 0);
}
if (handler->buffer.data) {
efree(handler->buffer.data);
}
if (handler->flags & PHP_OUTPUT_HANDLER_USER) {
zend_fcc_dtor(handler->func.user_fcc);
efree(handler->func.user_fcc);
}
if (handler->dtor && handler->opaq) {
handler->dtor(handler->opaq);
}
memset(handler, 0, sizeof(*handler));
}
/* }}} */
/* {{{ void php_output_handler_free(php_output_handler **handler)
* Destroy and free an output handler */
PHPAPI void php_output_handler_free(php_output_handler **h)
{
php_output_handler *handler = *h;
if (handler) {
*h = NULL;
php_output_handler_dtor(handler);
efree(handler);
}
}
/* }}} */
/* void php_output_set_implicit_flush(int enabled)
* Enable or disable implicit flush */
PHPAPI void php_output_set_implicit_flush(int flush)
{
if (flush) {
OG(flags) |= PHP_OUTPUT_IMPLICITFLUSH;
} else {
OG(flags) &= ~PHP_OUTPUT_IMPLICITFLUSH;
}
}
/* }}} */
/* {{{ char *php_output_get_start_filename(void)
* Get the file name where output has started */
PHPAPI const char *php_output_get_start_filename(void)
{
return OG(output_start_filename) ? ZSTR_VAL(OG(output_start_filename)) : NULL;
}
/* }}} */
/* {{{ int php_output_get_start_lineno(void)
* Get the line number where output has started */
PHPAPI int php_output_get_start_lineno(void)
{
return OG(output_start_lineno);
}
/* }}} */
/* {{{ static bool php_output_lock_error(int op)
* Checks whether an unallowed operation is attempted from within the output handler and issues a fatal error */
static inline bool php_output_lock_error(int op)
{
/* if there's no ob active, ob has been stopped */
if (op && OG(active) && OG(running)) {
/* fatal error */
php_output_deactivate();
php_error_docref("ref.outcontrol", E_ERROR, "Cannot use output buffering in output buffering display handlers");
return true;
}
return false;
}
/* }}} */
/* {{{ static php_output_context *php_output_context_init(php_output_context *context, int op)
* Initialize a new output context */
static inline void php_output_context_init(php_output_context *context, int op)
{
memset(context, 0, sizeof(php_output_context));
context->op = op;
}
/* }}} */
/* {{{ static void php_output_context_reset(php_output_context *context)
* Reset an output context */
static inline void php_output_context_reset(php_output_context *context)
{
int op = context->op;
php_output_context_dtor(context);
memset(context, 0, sizeof(php_output_context));
context->op = op;
}
/* }}} */
/* {{{ static void php_output_context_feed(php_output_context *context, char *, size_t, size_t)
* Feed output contexts input buffer */
static inline void php_output_context_feed(php_output_context *context, char *data, size_t size, size_t used, bool free)
{
if (context->in.free && context->in.data) {
efree(context->in.data);
}
context->in.data = data;
context->in.used = used;
context->in.free = free;
context->in.size = size;
}
/* }}} */
/* {{{ static void php_output_context_swap(php_output_context *context)
* Swap output contexts buffers */
static inline void php_output_context_swap(php_output_context *context)
{
if (context->in.free && context->in.data) {
efree(context->in.data);
}
context->in.data = context->out.data;
context->in.used = context->out.used;
context->in.free = context->out.free;
context->in.size = context->out.size;
context->out.data = NULL;
context->out.used = 0;
context->out.free = 0;
context->out.size = 0;
}
/* }}} */
/* {{{ static void php_output_context_pass(php_output_context *context)
* Pass input to output buffer */
static inline void php_output_context_pass(php_output_context *context)
{
context->out.data = context->in.data;
context->out.used = context->in.used;
context->out.size = context->in.size;
context->out.free = context->in.free;
context->in.data = NULL;
context->in.used = 0;
context->in.free = 0;
context->in.size = 0;
}
/* }}} */
/* {{{ static void php_output_context_dtor(php_output_context *context)
* Destroy the contents of an output context */
static inline void php_output_context_dtor(php_output_context *context)
{
if (context->in.free && context->in.data) {
efree(context->in.data);
context->in.data = NULL;
}
if (context->out.free && context->out.data) {
efree(context->out.data);
context->out.data = NULL;
}
}
/* }}} */
/* {{{ static php_output_handler *php_output_handler_init(zval *name, size_t chunk_size, int flags)
* Allocates and initializes a php_output_handler structure */
static inline php_output_handler *php_output_handler_init(zend_string *name, size_t chunk_size, int flags)
{
php_output_handler *handler;
handler = ecalloc(1, sizeof(php_output_handler));
handler->name = zend_string_copy(name);
handler->size = chunk_size;
handler->flags = flags;
handler->buffer.size = PHP_OUTPUT_HANDLER_INITBUF_SIZE(chunk_size);
handler->buffer.data = emalloc(handler->buffer.size);
return handler;
}
/* }}} */
/* {{{ static bool php_output_handler_append(php_output_handler *handler, const php_output_buffer *buf)
* Appends input to the output handlers buffer and indicates whether the buffer does not have to be processed by the output handler */
static inline bool php_output_handler_append(php_output_handler *handler, const php_output_buffer *buf)
{
if (buf->used) {
OG(flags) |= PHP_OUTPUT_WRITTEN;
/* store it away */
if ((handler->buffer.size - handler->buffer.used) <= buf->used) {
size_t grow_int = PHP_OUTPUT_HANDLER_INITBUF_SIZE(handler->size);
size_t grow_buf = PHP_OUTPUT_HANDLER_INITBUF_SIZE(buf->used - (handler->buffer.size - handler->buffer.used));
size_t grow_max = MAX(grow_int, grow_buf);
handler->buffer.data = safe_erealloc(handler->buffer.data, 1, handler->buffer.size, grow_max);
handler->buffer.size += grow_max;
}
memcpy(handler->buffer.data + handler->buffer.used, buf->data, buf->used);
handler->buffer.used += buf->used;
/* chunked buffering */
if (handler->size && (handler->buffer.used >= handler->size)) {
/* store away errors and/or any intermediate output */
return OG(running) ? true : false;
}
}
return true;
}
/* }}} */
/* {{{ static php_output_handler_status_t php_output_handler_op(php_output_handler *handler, php_output_context *context)
* Output handler operation dispatcher, applying context op to the php_output_handler handler */
static inline php_output_handler_status_t php_output_handler_op(php_output_handler *handler, php_output_context *context)
{
php_output_handler_status_t status;
int original_op = context->op;
#if PHP_OUTPUT_DEBUG
fprintf(stderr, ">>> op(%d, "
"handler=%p, "
"name=%s, "
"flags=%d, "
"buffer.data=%s, "
"buffer.used=%zu, "
"buffer.size=%zu, "
"in.data=%s, "
"in.used=%zu)\n",
context->op,
handler,
handler->name,
handler->flags,
handler->buffer.used?handler->buffer.data:"",
handler->buffer.used,
handler->buffer.size,
context->in.used?context->in.data:"",
context->in.used
);
#endif
if (handler->flags & PHP_OUTPUT_HANDLER_DISABLED) {
return PHP_OUTPUT_HANDLER_FAILURE;
}
if (php_output_lock_error(context->op)) {
/* fatal error */
return PHP_OUTPUT_HANDLER_FAILURE;
}
/* php_output_lock_error() doesn't fail for PHP_OUTPUT_HANDLER_WRITE but
* anything that gets written will silently be discarded, remember that we
* tried to write so a deprecation warning can be emitted at the end. */
if (context->op == PHP_OUTPUT_HANDLER_WRITE && OG(active) && OG(running)) {
handler->flags |= PHP_OUTPUT_HANDLER_PRODUCED_OUTPUT;
}
bool still_have_handler = true;
/* storable? */
if (php_output_handler_append(handler, &context->in) && !context->op) {
context->op = original_op;
return PHP_OUTPUT_HANDLER_NO_DATA;
} else {
/* need to start? */
if (!(handler->flags & PHP_OUTPUT_HANDLER_STARTED)) {
context->op |= PHP_OUTPUT_HANDLER_START;
}
OG(running) = handler;
if (handler->flags & PHP_OUTPUT_HANDLER_USER) {
zval ob_args[2];
zval retval;
/* ob_data */
ZVAL_STRINGL(&ob_args[0], handler->buffer.data, handler->buffer.used);
/* ob_mode */
ZVAL_LONG(&ob_args[1], (zend_long) context->op);
zend_call_known_fcc_ex(handler->func.user_fcc, &retval, 2, ob_args, NULL, zend_fci_consumed_arg(0));
zval_ptr_dtor(&ob_args[0]);
zval_ptr_dtor(&ob_args[1]);
if (Z_TYPE(retval) != IS_UNDEF) {
if (handler->flags & PHP_OUTPUT_HANDLER_PRODUCED_OUTPUT) {
// Make sure that we don't get lost in the current output buffer
// by disabling it
handler->flags |= PHP_OUTPUT_HANDLER_DISABLED;
if (handler->flags & PHP_OUTPUT_HANDLER_PRODUCED_OUTPUT) {
// The handler might not always produce output
handler->flags &= ~PHP_OUTPUT_HANDLER_PRODUCED_OUTPUT;
php_error_docref(
NULL,
E_DEPRECATED,
"Producing output from user output handler %s is deprecated",
ZSTR_VAL(handler->name)
);
}
// Check if the handler is still in the list of handlers to
// determine if the PHP_OUTPUT_HANDLER_DISABLED flag can
// be removed
still_have_handler = false;
int handler_count = php_output_get_level();
if (handler_count) {
php_output_handler **handlers = (php_output_handler **) zend_stack_base(&OG(handlers));
for (int handler_num = 0; handler_num < handler_count; ++handler_num) {
php_output_handler *curr_handler = handlers[handler_num];
if (curr_handler == handler) {
handler->flags &= (~PHP_OUTPUT_HANDLER_DISABLED);