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/*
Copyright (C) 2014 Flexible Software Solutions S.L.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef USE_LZ4
#define SPICE_LOG_DOMAIN "SpiceLz4Encoder"
#include <arpa/inet.h>
#include <lz4.h>
#include "red_common.h"
#include "lz4_encoder.h"
typedef struct Lz4Encoder {
Lz4EncoderUsrContext *usr;
} Lz4Encoder;
Lz4EncoderContext* lz4_encoder_create(Lz4EncoderUsrContext *usr)
{
Lz4Encoder *enc;
if (!usr->more_space || !usr->more_lines) {
return NULL;
}
enc = spice_new0(Lz4Encoder, 1);
enc->usr = usr;
return (Lz4EncoderContext*)enc;
}
void lz4_encoder_destroy(Lz4EncoderContext* encoder)
{
free(encoder);
}
int lz4_encode(Lz4EncoderContext *lz4, int height, int stride, uint8_t *io_ptr,
unsigned int num_io_bytes, int top_down, uint8_t format)
{
Lz4Encoder *enc = (Lz4Encoder *)lz4;
uint8_t *lines;
int num_lines = 0;
int total_lines = 0;
int in_size, enc_size, out_size, already_copied;
uint8_t *in_buf, *compressed_lines;
uint8_t *out_buf = io_ptr;
LZ4_stream_t *stream = LZ4_createStream();
// Encode direction and format
*(out_buf++) = top_down ? 1 : 0;
*(out_buf++) = format;
num_io_bytes -= 2;
out_size = 2;
do {
num_lines = enc->usr->more_lines(enc->usr, &lines);
if (num_lines <= 0) {
spice_error("more lines failed");
LZ4_freeStream(stream);
return 0;
}
in_buf = lines;
in_size = stride * num_lines;
lines += in_size;
compressed_lines = (uint8_t *) malloc(LZ4_compressBound(in_size) + 4);
enc_size = LZ4_compress_continue(stream, (const char *) in_buf,
(char *) compressed_lines + 4, in_size);
if (enc_size <= 0) {
spice_error("compress failed!");
free(compressed_lines);
LZ4_freeStream(stream);
return 0;
}
*((uint32_t *)compressed_lines) = htonl(enc_size);
out_size += enc_size += 4;
already_copied = 0;
while (num_io_bytes < enc_size) {
memcpy(out_buf, compressed_lines + already_copied, num_io_bytes);
already_copied += num_io_bytes;
enc_size -= num_io_bytes;
num_io_bytes = enc->usr->more_space(enc->usr, &io_ptr);
if (num_io_bytes <= 0) {
spice_error("more space failed");
free(compressed_lines);
LZ4_freeStream(stream);
return 0;
}
out_buf = io_ptr;
}
memcpy(out_buf, compressed_lines + already_copied, enc_size);
out_buf += enc_size;
num_io_bytes -= enc_size;
free(compressed_lines);
total_lines += num_lines;
} while (total_lines < height);
LZ4_freeStream(stream);
if (total_lines != height) {
spice_error("too many lines\n");
out_size = 0;
}
return out_size;
}
#endif // USE_LZ4
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