lighttpd 1.4.x https://www.lighttpd.net/
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/*
* http_etag - HTTP ETag manipulation
*
* Copyright(c) 2015,2020 Glenn Strauss gstrauss()gluelogic.com All rights reserved
* License: BSD 3-clause (same as lighttpd)
*/
#include "first.h"
#include "http_etag.h"
#include <sys/stat.h>
#include <string.h>
#include "algo_md.h"
#include "buffer.h"
int
http_etag_matches (const buffer * const etag, const char *s, const int weak_ok)
{
if ('*' == s[0] && '\0' == s[1]) return 1;
if (buffer_string_is_empty(etag)) return 0;
uint32_t etag_sz = buffer_string_length(etag);
const char *etag_ptr = etag->ptr;
if (etag_ptr[0] == 'W' && etag_ptr[1] == '/') {
if (!weak_ok) return 0;
etag_ptr += 2;
etag_sz -= 2;
}
while (*s) {
while (*s == ' ' || *s == '\t' || *s == ',') ++s;
if (s[0] == 'W' && s[1] == '/' ? (s+=2, weak_ok) : 1) {
if (0 == strncmp(s, etag_ptr, etag_sz) || *s == '*') {
s += (*s != '*' ? etag_sz : 1);
if (*s == '\0' || *s == ' ' || *s == '\t' || *s == ',')
return 1;
}
}
while (*s != '\0' && *s != ',') ++s;
}
return 0;
}
static void
http_etag_remix (buffer * const etag, const char * const str, const uint32_t len)
{
uint32_t h = dekhash(str, len, len); /*(pass len as initial hash value)*/
uint32_t elen = buffer_string_length(etag);
if (elen > 2) /*(expect "..." if set)*/
h = dekhash(etag->ptr+1, elen-2, h);
buffer_string_set_length(etag, 1);
etag->ptr[0] = '\"';
buffer_append_int(etag, h);
buffer_append_string_len(etag, CONST_STR_LEN("\""));
}
void
http_etag_create (buffer * const etag, const struct stat * const st, const int flags)
{
if (0 == flags) return;
uint64_t x[4];
uint32_t len = 0;
if (flags & ETAG_USE_INODE)
x[len++] = (uint64_t)st->st_ino;
if (flags & ETAG_USE_SIZE)
x[len++] = (uint64_t)st->st_size;
if (flags & ETAG_USE_MTIME) {
x[len++] = (uint64_t)st->st_mtime;
#ifdef st_mtime /* use high-precision timestamp if available */
#if defined(__APPLE__) && defined(__MACH__)
x[len++] = (uint64_t)st->st_mtimespec.tv_nsec;
#else
x[len++] = (uint64_t)st->st_mtim.tv_nsec;
#endif
#endif
}
buffer_clear(etag);
http_etag_remix(etag, (char *)x, len << 3);
}