buckets/apr_buckets_file.c

/* ====================================================================
 * The Apache Software License, Version 1.1
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 * Copyright (c) 2000 The Apache Software Foundation.  All rights
 * reserved.
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 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
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 */

#include "apr_private.h"
#include "httpd.h"
#include "ap_buckets.h"
#include <stdlib.h>

/* XXX: We should obey the block flag */
static apr_status_t file_read(ap_bucket *a, const char **str,
			      apr_ssize_t *len, int block)
{
    apr_file_t *f = (apr_file_t *) a->data;
    ap_bucket *b = NULL;
    char *buf;
    apr_status_t rv;

    buf = malloc(IOBUFSIZE);
    *str = buf;

    if (a->length > IOBUFSIZE) {
        *len = IOBUFSIZE;
    }
    else {
        *len = a->length;
    }

    /* Handle offset ... */
    if (a->offset) {
        rv = apr_seek(f, APR_SET, &a->offset);
        if (rv != APR_SUCCESS) {
            free(buf);
            return rv;
        }
        /* Only need to do seek the first time through */
        a->offset = 0;
    }

    rv = apr_read(f, buf, len);
    if (rv != APR_SUCCESS && rv != APR_EOF) {
	free(buf);
        return rv;
    }

    /*
     * Change the current bucket to refer to what we read,
     * even if we read nothing because we hit EOF.
     */
    ap_bucket_make_heap(a, buf, *len, 0, NULL);  /* XXX: check for failure? */

    /* If we have more to read from the file, then create another bucket */
    if (*len > 0) {
        b = ap_bucket_create_file(f, 0, a->length);
	AP_BUCKET_INSERT_AFTER(a, b);
    }
    return APR_SUCCESS;
}

API_EXPORT(ap_bucket *) ap_bucket_make_file(ap_bucket *b, apr_file_t *fd,
                                            apr_off_t offset, apr_size_t len)
{
    b->type = AP_BUCKET_FILE;
    b->data = fd;
    b->length = len;
    b->offset = offset;
    b->destroy = NULL;
    b->read = file_read;
    b->setaside = NULL;
    b->split = NULL;

    return b;
}

API_EXPORT(ap_bucket *) ap_bucket_create_file(apr_file_t *fd, apr_off_t offset, apr_size_t len)
{
    ap_bucket_do_create(ap_bucket_make_file(b, fd, offset, len));
}