Ziele Untersuchung
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Denken Kreativität

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


products/Sources/formale Sprachen/C/Firefox/third_party/msgpack/src/ (Browser von der Mozilla Stiftung Version 136.0.1^©) Datei vom 10.2.2025 mit Größe 6 kB

Quelle vrefbuffer.c Sprache: C

/*
* MessagePack for C zero-copy buffer implementation
*
* Copyright (C) 2008-2009 FURUHASHI Sadayuki
*
*    Distributed under the Boost Software License, Version 1.0.
*    (See accompanying file LICENSE_1_0.txt or copy at
*    http://www.boost.org/LICENSE_1_0.txt)
*/
#include "msgpack/vrefbuffer.h"
#include <stdlib.h>
#include <string.h>

#define MSGPACK_PACKER_MAX_BUFFER_SIZE 9

struct msgpack_vrefbuffer_chunk {
    struct msgpack_vrefbuffer_chunk* next;
    /* data ... */
};

bool msgpack_vrefbuffer_init(msgpack_vrefbuffer* vbuf,
        size_t ref_size, size_t chunk_size)
{
    size_t nfirst;
    struct iovec* array;
    msgpack_vrefbuffer_chunk* chunk;

    vbuf->chunk_size = chunk_size;
    vbuf->ref_size =
        ref_size > MSGPACK_PACKER_MAX_BUFFER_SIZE + 1 ?
        ref_size : MSGPACK_PACKER_MAX_BUFFER_SIZE + 1 ;

    nfirst = (sizeof(struct iovec) < 72/2) ?
            72 / sizeof(struct iovec) : 8;

    array = (struct iovec*)malloc(
            sizeof(struct iovec) * nfirst);
    if(array == NULL) {
        return false;
    }

    vbuf->tail  = array;
    vbuf->end   = array + nfirst;
    vbuf->array = array;

    chunk = (msgpack_vrefbuffer_chunk*)malloc(
            sizeof(msgpack_vrefbuffer_chunk) + chunk_size);
    if(chunk == NULL) {
        free(array);
        return false;
    }
    else {
        msgpack_vrefbuffer_inner_buffer* const ib = &vbuf->inner_buffer;

        ib->free = chunk_size;
        ib->ptr  = ((char*)chunk) + sizeof(msgpack_vrefbuffer_chunk);
        ib->head = chunk;
        chunk->next = NULL;

        return true;
    }
}

void msgpack_vrefbuffer_destroy(msgpack_vrefbuffer* vbuf)
{
    msgpack_vrefbuffer_chunk* c = vbuf->inner_buffer.head;
    while(true) {
        msgpack_vrefbuffer_chunk* n = c->next;
        free(c);
        if(n != NULL) {
            c = n;
        } else {
            break;
        }
    }
    free(vbuf->array);
}

void msgpack_vrefbuffer_clear(msgpack_vrefbuffer* vbuf)
{
    msgpack_vrefbuffer_chunk* c = vbuf->inner_buffer.head->next;
    msgpack_vrefbuffer_chunk* n;
    while(c != NULL) {
        n = c->next;
        free(c);
        c = n;
    }

    {
        msgpack_vrefbuffer_inner_buffer* const ib = &vbuf->inner_buffer;
        msgpack_vrefbuffer_chunk* chunk = ib->head;
        chunk->next = NULL;
        ib->free = vbuf->chunk_size;
        ib->ptr  = ((char*)chunk) + sizeof(msgpack_vrefbuffer_chunk);

        vbuf->tail = vbuf->array;
    }
}

int msgpack_vrefbuffer_append_ref(msgpack_vrefbuffer* vbuf,
        const char* buf, size_t len)
{
    if(vbuf->tail == vbuf->end) {
        const size_t nused = (size_t)(vbuf->tail - vbuf->array);
        const size_t nnext = nused * 2;

        struct iovec* nvec = (struct iovec*)realloc(
                vbuf->array, sizeof(struct iovec)*nnext);
        if(nvec == NULL) {
            return -1;
        }

        vbuf->array = nvec;
        vbuf->end   = nvec + nnext;
        vbuf->tail  = nvec + nused;
    }

    vbuf->tail->iov_base = (char*)buf;
    vbuf->tail->iov_len  = len;
    ++vbuf->tail;

    return 0;
}

int msgpack_vrefbuffer_append_copy(msgpack_vrefbuffer* vbuf,
        const char* buf, size_t len)
{
    msgpack_vrefbuffer_inner_buffer* const ib = &vbuf->inner_buffer;
    char* m;

    if(ib->free < len) {
        msgpack_vrefbuffer_chunk* chunk;
        size_t sz = vbuf->chunk_size;
        if(sz < len) {
            sz = len;
        }

        chunk = (msgpack_vrefbuffer_chunk*)malloc(
                sizeof(msgpack_vrefbuffer_chunk) + sz);
        if(chunk == NULL) {
            return -1;
        }

        chunk->next = ib->head;
        ib->head = chunk;
        ib->free = sz;
        ib->ptr  = ((char*)chunk) + sizeof(msgpack_vrefbuffer_chunk);
    }

    m = ib->ptr;
    memcpy(m, buf, len);
    ib->free -= len;
    ib->ptr  += len;

    if(vbuf->tail != vbuf->array && m ==
            (const char*)((vbuf->tail-1)->iov_base) + (vbuf->tail-1)->iov_len) {
        (vbuf->tail-1)->iov_len += len;
        return 0;
    } else {
        return msgpack_vrefbuffer_append_ref(vbuf, m, len);
    }
}

int msgpack_vrefbuffer_migrate(msgpack_vrefbuffer* vbuf, msgpack_vrefbuffer* to)
{
    size_t sz = vbuf->chunk_size;

    msgpack_vrefbuffer_chunk* empty = (msgpack_vrefbuffer_chunk*)malloc(
            sizeof(msgpack_vrefbuffer_chunk) + sz);
    if(empty == NULL) {
        return -1;
    }

    empty->next = NULL;

    {
        const size_t nused = (size_t)(vbuf->tail - vbuf->array);
        if(to->tail + nused < vbuf->end) {
            struct iovec* nvec;
            const size_t tosize = (size_t)(to->tail - to->array);
            const size_t reqsize = nused + tosize;
            size_t nnext = (size_t)(to->end - to->array) * 2;
            while(nnext < reqsize) {
                size_t tmp_nnext = nnext * 2;
                if (tmp_nnext <= nnext) {
                    nnext = reqsize;
                    break;
                }
                nnext = tmp_nnext;
            }

            nvec = (struct iovec*)realloc(
                    to->array, sizeof(struct iovec)*nnext);
            if(nvec == NULL) {
                free(empty);
                return -1;
            }

            to->array = nvec;
            to->end   = nvec + nnext;
            to->tail  = nvec + tosize;
        }

        memcpy(to->tail, vbuf->array, sizeof(struct iovec)*nused);

        to->tail += nused;
        vbuf->tail = vbuf->array;

        {
            msgpack_vrefbuffer_inner_buffer* const ib = &vbuf->inner_buffer;
            msgpack_vrefbuffer_inner_buffer* const toib = &to->inner_buffer;

            msgpack_vrefbuffer_chunk* last = ib->head;
            while(last->next != NULL) {
                last = last->next;
            }
            last->next = toib->head;
            toib->head = ib->head;

            if(toib->free < ib->free) {
                toib->free = ib->free;
                toib->ptr  = ib->ptr;
            }

            ib->head = empty;
            ib->free = sz;
            ib->ptr  = ((char*)empty) + sizeof(msgpack_vrefbuffer_chunk);
        }
    }

    return 0;
}

quality92%

¤ Dauer der Verarbeitung: 0.14 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.