root/trunk/src/etag.c

#include <string.h>

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

#if defined HAVE_STDINT_H
#include <stdint.h>
#elif defined HAVE_INTTYPES_H
#include <inttypes.h>
#endif

#include "buffer.h"
#include "etag.h"

int etag_is_equal(buffer *etag, const char *matches) {
        if (buffer_is_equal_string(etag, matches, strlen(matches))) return 1;
        return 0;
}

int etag_create(buffer *etag, struct stat *st, etag_flags_t flags) {

        if (0 == flags) return 0;

        buffer_reset(etag);

        if (flags & ETAG_USE_INODE) {
                buffer_append_off_t(etag, st->st_ino);
                buffer_append_string_len(etag, CONST_STR_LEN("-"));
        }
        if (flags & ETAG_USE_SIZE) {
                buffer_append_off_t(etag, st->st_size);
                buffer_append_string_len(etag, CONST_STR_LEN("-"));
        }
        if (flags & ETAG_USE_MTIME) {
                buffer_append_long(etag, st->st_mtime);
        }
        return 0;
}

int etag_mutate(buffer *mut, buffer *etag) {
        size_t i;
        uint32_t h;

        for (h=0, i=0; i < etag->used; ++i) h = (h<<5)^(h>>27)^(etag->ptr[i]);

        buffer_reset(mut);
        buffer_copy_string_len(mut, CONST_STR_LEN("\""));
        buffer_append_long(mut, h);
        buffer_append_string_len(mut, CONST_STR_LEN("\""));

        return 0;
}