vnc-clipboard.c

/*
 * QEMU VNC display driver -- clipboard support
 *
 * Copyright (C) 2021 Gerd Hoffmann <kraxel@redhat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "vnc.h"
#include "vnc-jobs.h"

static uint8_t *inflate_buffer(uint8_t *in, uint32_t in_len, uint32_t *size)
{
    z_stream stream = {
        .next_in  = in,
        .avail_in = in_len,
        .zalloc   = Z_NULL,
        .zfree    = Z_NULL,
    };
    uint32_t out_len = 8;
    uint8_t *out = g_malloc(out_len);
    int ret;

    stream.next_out = out + stream.total_out;
    stream.avail_out = out_len - stream.total_out;

    ret = inflateInit(&stream);
    if (ret != Z_OK) {
        goto err;
    }

    while (stream.avail_in) {
        ret = inflate(&stream, Z_FINISH);
        switch (ret) {
        case Z_OK:
        case Z_STREAM_END:
            break;
        case Z_BUF_ERROR:
            out_len <<= 1;
            if (out_len > (1 << 20)) {
                goto err_end;
            }
            out = g_realloc(out, out_len);
            stream.next_out = out + stream.total_out;
            stream.avail_out = out_len - stream.total_out;
            break;
        default:
            goto err_end;
        }
    }

    *size = stream.total_out;
    inflateEnd(&stream);