zopfli.c

/****************************************************************************
 *
 *  Copyright (c) 2013 clickalicious UG
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef linux
/* To enable CPU_ZERO and CPU_SET, etc. */
# define _GNU_SOURCE
#endif

// general extension related
#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "php_zopfli.h"
#include "Zend/zend_extensions.h"

// get required lib files
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


// PHP ini mod
PHP_INI_BEGIN()
PHP_INI_ENTRY("zopfli.iterations", "5", PHP_INI_ALL, NULL)
PHP_INI_END()

// compiled function list so Zend knows what's in this module
zend_function_entry zopfli_functions[] = {    
   ZEND_FE(zopfliencode, NULL)
   {NULL, NULL, NULL}
};

/* compiled module information */    
zend_module_entry zopfli_module_entry = {
  #if ZEND_MODULE_API_NO >= 20010901
    STANDARD_MODULE_HEADER,           // Roughly means if PHP Version > 4.2.0
  #endif
    PHP_ZOPFLI_EXTNAME,               // Define PHP extension name
    zopfli_functions,                 /* Functions */
    PHP_MINIT(zopfli),                /* MINIT */
    PHP_MSHUTDOWN(zopfli),            /* MSHUTDOWN */
    NULL,                             /* RINIT */
    NULL,                             /* RSHUTDOWN */
    NULL,                             /* MINFO */
  #if ZEND_MODULE_API_NO >= 20010901
    PHP_ZOPFLI_VERSION,               // Roughly means if PHP Version > 4.2.0  
  #endif
    STANDARD_MODULE_PROPERTIES
};
#ifdef COMPILE_DL_ZOPFLI
ZEND_GET_MODULE(zopfli)               // Common for all PHP extensions which are build as shared modules
#endif

/* ? */
ZEND_FUNCTION(zopfliencode);

/* ZOPFLI */
ZEND_FUNCTION(zopfliencode)
{
    char    *buffer;
    size_t   len_buffer;
    char    *output      = 0;
    size_t   len_output  = 0;
    long     iterations;
    int      len_iterations;
    Options  options;

    if (zend_parse_parameters(
        ZEND_NUM_ARGS() TSRMLS_CC, 
        "s|l", 
        &buffer, 
        &len_buffer, 
        &iterations, 
        &len_iterations) == FAILURE
    ) {
        RETURN_STRING("Bad parameters!", 1);
    }

    if (!iterations) {
        iterations = INI_INT("zopfli.iterations");
    }

    // set options defaults
    options.verbose            = 0;
    options.numiterations      = (int)iterations;
    options.blocksplitting     = 1;
    options.blocksplittinglast = 0;
    options.blocksplittingmax  = 15;

    // compress input
    GzipCompress(
        &options, 
        buffer, 
        len_buffer, 
        &output, 
        &len_output
    );
    
    // return result STRINGL otherwise binary data could 
    // be cutted randomly at \0 null byte in string
    RETURN_STRINGL(output, len_output, 1);
}

// init method
PHP_MINIT_FUNCTION(zopfli)
{
    REGISTER_INI_ENTRIES();
    return SUCCESS;
}

// shutdown method
PHP_MSHUTDOWN_FUNCTION(zopfli)
{
    UNREGISTER_INI_ENTRIES();
    return SUCCESS;
}