wsstream_data.c

来自「mms client」· C语言 代码 · 共 71 行

/*
 *
 * wsstream_data.c
 *
 * Author: Markku Rossi <[e-mail]>
 *
 * Copyright (c) 1999-2000 WAPIT OY LTD.
 *		 All rights reserved.
 *
 * Implementation of the data streams.
 *
 */

#include "wmlscript/wsint.h"

/********************* Types and definitions ****************************/

struct WsStreamDataInputCtxRec
{
    const unsigned char *data;
    size_t data_len;
    size_t data_pos;
};

typedef struct WsStreamDataInputCtxRec WsStreamDataInputCtx;

/********************* Static method functions **************************/

static size_t data_input(void *context, WsUInt32 *buf, size_t buflen)
{
    WsStreamDataInputCtx *ctx = (WsStreamDataInputCtx *) context;
    size_t read;

    for (read = 0;
         read < buflen && ctx->data_pos < ctx->data_len;
         read++, ctx->data_pos++)
        buf[read] = ctx->data[ctx->data_pos];

    return read;
}


static void data_close(void *context)
{
    WsStreamDataInputCtx *ctx = (WsStreamDataInputCtx *) context;

    ws_free(ctx);
}

/********************* Global functions *********************************/

WsStream *ws_stream_new_data_input(const unsigned char *data, size_t data_len)
{
    WsStreamDataInputCtx *ctx = ws_calloc(1, sizeof(*ctx));
    WsStream *stream;

    if (ctx == NULL)
        return NULL;

    ctx->data = data;
    ctx->data_len = data_len;

    stream = ws_stream_new(ctx, data_input, NULL, data_close);

    if (stream == NULL)
        /* The stream creation failed.  Close the stream context. */
        data_close(ctx);

    return stream;
}