buckets/mmap_buckets.c

/* ====================================================================
 * The Apache Software License, Version 1.1
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 * Copyright (c) 2003 The Apache Software Foundation.  All rights
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#include <apr_pools.h>
#include <apr_mmap.h>

#include "serf.h"
#include "serf_bucket_util.h"


typedef struct {
    apr_mmap_t *mmap;
    void *current;
    apr_off_t offset;
    apr_off_t remaining;
} mmap_context_t;


SERF_DECLARE(serf_bucket_t *) serf_bucket_mmap_create(
    apr_mmap_t *file_mmap,
    serf_bucket_alloc_t *allocator)
{
    mmap_context_t *ctx;

    ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx));
    ctx->mmap = file_mmap;
    ctx->current = NULL;
    ctx->offset = 0;
    ctx->remaining = ctx->mmap->size;

    return serf_bucket_create(&serf_bucket_type_simple, allocator, ctx);
}

static apr_status_t serf_mmap_read(serf_bucket_t *bucket,
                                     apr_size_t requested,
                                     const char **data, apr_size_t *len)
{
    mmap_context_t *ctx = bucket->data;

    if (requested == SERF_READ_ALL_AVAIL || requested > ctx->remaining) {
        *len = ctx->remaining;
    }

    /* ### Would it be faster to call this once and do the offset ourselves? */
    apr_mmap_offset((void**)data, ctx->mmap, ctx->offset);

    /* For the next read... */
    ctx->offset += *len;
    ctx->remaining -= *len;

    if (ctx->remaining == 0) {
        return APR_EOF;
    }
    return APR_SUCCESS;
}

static apr_status_t serf_mmap_readline(serf_bucket_t *bucket,
                                         int acceptable, int *found,
                                         const char **data, apr_size_t *len)
{
    /* ### need our utility function... */
    return APR_ENOTIMPL;
}

static apr_status_t serf_mmap_peek(serf_bucket_t *bucket,
                                     const char **data,
                                     apr_size_t *len)
{
    /* Oh, bah. */
    return APR_ENOTIMPL;
}

SERF_DECLARE_DATA const serf_bucket_type_t serf_bucket_type_mmap = {
    "MMAP",
    serf_mmap_read,
    serf_mmap_readline,
    serf_default_read_iovec,
    serf_default_read_for_sendfile,
    serf_default_read_bucket,
    serf_mmap_peek,
    serf_default_get_metadata,
    serf_default_set_metadata,
    serf_default_destroy_and_data,
};