mirror of
https://gitlab.uni-freiburg.de/opensourcevdi/spice
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d7fb7b0b36
Let's follow the 'standard' for optional components. This commit also drops (now) unecessary #ifdef USE_LZ4 from lz4-encode.c, as the decision to build this file is now made in Makefile. Signed-off-by: Eduardo Lima (Etrunko) <etrunko@redhat.com> Acked-by: Christophe Fergeau <cfergeau@redhat.com>
120 lines
3.6 KiB
C
120 lines
3.6 KiB
C
/*
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Copyright (C) 2014 Flexible Software Solutions S.L.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#define SPICE_LOG_DOMAIN "SpiceLz4Encoder"
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#include <arpa/inet.h>
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#include <lz4.h>
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#include "red-common.h"
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#include "lz4-encoder.h"
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typedef struct Lz4Encoder {
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Lz4EncoderUsrContext *usr;
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} Lz4Encoder;
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Lz4EncoderContext* lz4_encoder_create(Lz4EncoderUsrContext *usr)
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{
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Lz4Encoder *enc;
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if (!usr->more_space || !usr->more_lines) {
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return NULL;
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}
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enc = spice_new0(Lz4Encoder, 1);
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enc->usr = usr;
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return (Lz4EncoderContext*)enc;
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}
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void lz4_encoder_destroy(Lz4EncoderContext* encoder)
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{
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free(encoder);
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}
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int lz4_encode(Lz4EncoderContext *lz4, int height, int stride, uint8_t *io_ptr,
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unsigned int num_io_bytes, int top_down, uint8_t format)
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{
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Lz4Encoder *enc = (Lz4Encoder *)lz4;
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uint8_t *lines;
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int num_lines = 0;
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int total_lines = 0;
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int in_size, enc_size, out_size, already_copied;
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uint8_t *in_buf, *compressed_lines;
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uint8_t *out_buf = io_ptr;
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LZ4_stream_t *stream = LZ4_createStream();
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// Encode direction and format
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*(out_buf++) = top_down ? 1 : 0;
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*(out_buf++) = format;
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num_io_bytes -= 2;
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out_size = 2;
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do {
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num_lines = enc->usr->more_lines(enc->usr, &lines);
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if (num_lines <= 0) {
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spice_error("more lines failed");
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LZ4_freeStream(stream);
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return 0;
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}
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in_buf = lines;
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in_size = stride * num_lines;
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lines += in_size;
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compressed_lines = (uint8_t *) malloc(LZ4_compressBound(in_size) + 4);
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enc_size = LZ4_compress_continue(stream, (const char *) in_buf,
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(char *) compressed_lines + 4, in_size);
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if (enc_size <= 0) {
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spice_error("compress failed!");
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free(compressed_lines);
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LZ4_freeStream(stream);
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return 0;
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}
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*((uint32_t *)compressed_lines) = htonl(enc_size);
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out_size += enc_size += 4;
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already_copied = 0;
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while (num_io_bytes < enc_size) {
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memcpy(out_buf, compressed_lines + already_copied, num_io_bytes);
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already_copied += num_io_bytes;
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enc_size -= num_io_bytes;
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num_io_bytes = enc->usr->more_space(enc->usr, &io_ptr);
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if (num_io_bytes <= 0) {
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spice_error("more space failed");
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free(compressed_lines);
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LZ4_freeStream(stream);
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return 0;
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}
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out_buf = io_ptr;
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}
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memcpy(out_buf, compressed_lines + already_copied, enc_size);
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out_buf += enc_size;
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num_io_bytes -= enc_size;
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free(compressed_lines);
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total_lines += num_lines;
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} while (total_lines < height);
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LZ4_freeStream(stream);
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if (total_lines != height) {
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spice_error("too many lines\n");
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out_size = 0;
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}
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return out_size;
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}
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