xslt.c 3.99 KB
Newer Older
1 2 3 4
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

5 6 7 8 9 10 11 12 13 14 15 16 17
#include <string.h>
#include <libxml/xmlmemory.h>
#include <libxml/debugXML.h>
#include <libxml/HTMLtree.h>
#include <libxml/xmlIO.h>
#include <libxml/DOCBparser.h>
#include <libxml/xinclude.h>
#include <libxml/catalog.h>
#include <libxslt/xslt.h>
#include <libxslt/xsltInternals.h>
#include <libxslt/transform.h>
#include <libxslt/xsltutils.h>

18 19 20 21 22 23 24 25
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

#ifndef _WIN32
#include <sys/time.h>
#endif

26

Karl Heyes's avatar
Karl Heyes committed
27 28 29 30
#include "thread/thread.h"
#include "avl/avl.h"
#include "httpp/httpp.h"
#include "net/sock.h"
31 32 33 34 35 36 37 38

#include "connection.h"

#include "global.h"
#include "refbuf.h"
#include "client.h"
#include "stats.h"

39
#define CATMODULE "xslt"
Karl Heyes's avatar
Karl Heyes committed
40

41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
#include "logging.h"

typedef struct {
    char              *filename;
    time_t             last_modified;
    time_t             cache_age;
    xsltStylesheetPtr  stylesheet;
} stylesheet_cache_t;

/* Keep it small... */
#define CACHESIZE 3

stylesheet_cache_t cache[CACHESIZE];
mutex_t xsltlock;

void xslt_initialize()
{
    memset(cache, 0, sizeof(stylesheet_cache_t)*CACHESIZE);
    thread_mutex_create(&xsltlock);
}

void xslt_shutdown() {
    int i;

    for(i=0; i < CACHESIZE; i++) {
        if(cache[i].filename)
            free(cache[i].filename);
        if(cache[i].stylesheet)
            xsltFreeStylesheet(cache[i].stylesheet);
    }

    xsltCleanupGlobals();
}

static int evict_cache_entry() {
brendan's avatar
brendan committed
76
    int i, age=0, oldest=0;
77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103

    for(i=0; i < CACHESIZE; i++) {
        if(cache[i].cache_age > age) {
            age = cache[i].cache_age;
            oldest = i;
        }
    }

    xsltFreeStylesheet(cache[oldest].stylesheet);
    free(cache[oldest].filename);

    return oldest;
}

static xsltStylesheetPtr xslt_get_stylesheet(char *fn) {
    int i;
    int empty = -1;
    struct stat file;

    if(stat(fn, &file)) {
        DEBUG1("Error checking for stylesheet file: %s", strerror(errno));
        return NULL;
    }

    for(i=0; i < CACHESIZE; i++) {
        if(cache[i].filename)
        {
104 105 106
#ifdef _WIN32
            if(!stricmp(fn, cache[i].filename))
#else
107
            if(!strcmp(fn, cache[i].filename))
108
#endif
109 110 111 112 113 114 115 116 117
            {
                if(file.st_mtime > cache[i].last_modified)
                {
                    xsltFreeStylesheet(cache[i].stylesheet);

                    cache[i].last_modified = file.st_mtime;
                    cache[i].stylesheet = xsltParseStylesheetFile(fn);
                    cache[i].cache_age = time(NULL);
                }
118
                DEBUG1("Using cached sheet %i", i);
119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136
                return cache[i].stylesheet;
            }
        }
        else
            empty = i;
    }

    if(empty>=0)
        i = empty;
    else
        i = evict_cache_entry();

    cache[i].last_modified = file.st_mtime;
    cache[i].filename = strdup(fn);
    cache[i].stylesheet = xsltParseStylesheetFile(fn);
    cache[i].cache_age = time(NULL);
    return cache[i].stylesheet;
}
137

138
void xslt_transform(xmlDocPtr doc, char *xslfilename, client_t *client)
139 140
{
    xmlOutputBufferPtr outputBuffer;
141 142 143
    xmlDocPtr    res;
    xsltStylesheetPtr cur;
    const char *params[16 + 1];
144
    size_t count,bytes;
145

146
    params[0] = NULL;
147

148 149
    xmlSubstituteEntitiesDefault(1);
    xmlLoadExtDtdDefaultValue = 1;
150

151 152 153 154
    thread_mutex_lock(&xsltlock);
    cur = xslt_get_stylesheet(xslfilename);
    thread_mutex_unlock(&xsltlock);

155 156
    if (cur == NULL) {
        bytes = sock_write_string(client->con->sock, 
157 158 159
                (char *)"Could not parse XSLT file");
        if(bytes > 0) client->con->sent_bytes += bytes;
        
160
        return;
161
    }
162 163 164 165 166 167 168 169

    res = xsltApplyStylesheet(cur, doc, params);

    outputBuffer = xmlAllocOutputBuffer(NULL);

    count = xsltSaveResultTo(outputBuffer, res, cur);

    /*  Add null byte to end. */
170
    bytes = xmlOutputBufferWrite(outputBuffer, 1, "");
171

172
    if(sock_write_string(client->con->sock, 
173 174 175
                (char *)outputBuffer->buffer->content))
        client->con->sent_bytes += bytes;
    
176
    xmlOutputBufferClose(outputBuffer);
177 178 179
    xmlFreeDoc(res);
}