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// SPDX-License-Identifier: LGPL-2.1
/*
* Copyright (C) 2022, Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
*
*/
#include <stdlib.h>
#include <zstd.h>
#include <errno.h>
#include "trace-cmd-private.h"
#define __ZSTD_NAME "zstd"
#define __ZSTD_WEIGTH 5
struct zstd_context {
ZSTD_CCtx *ctx_c;
ZSTD_DCtx *ctx_d;
};
static int zstd_compress(void *ctx, const void *in, int in_bytes, void *out, int out_bytes)
{
struct zstd_context *context = ctx;
size_t ret;
if (!ctx)
return -1;
ret = ZSTD_compress2(context->ctx_c, out, out_bytes, in, in_bytes);
if (ZSTD_isError(ret))
return -1;
return ret;
}
static int zstd_decompress(void *ctx, const void *in, int in_bytes, void *out, int out_bytes)
{
struct zstd_context *context = ctx;
size_t ret;
if (!ctx)
return -1;
ret = ZSTD_decompressDCtx(context->ctx_d, out, out_bytes, in, in_bytes);
if (ZSTD_isError(ret)) {
errno = -EINVAL;
return -1;
}
return ret;
}
static unsigned int zstd_compress_bound(void *ctx, unsigned int in_bytes)
{
return ZSTD_compressBound(in_bytes);
}
static bool zstd_is_supported(const char *name, const char *version)
{
if (!name)
return false;
if (strcmp(name, __ZSTD_NAME))
return false;
return true;
}
static void *new_zstd_context(void)
{
struct zstd_context *context;
size_t r;
context = calloc(1, sizeof(*context));
if (!context)
return NULL;
context->ctx_c = ZSTD_createCCtx();
context->ctx_d = ZSTD_createDCtx();
if (!context->ctx_c || !context->ctx_d)
goto err;
r = ZSTD_CCtx_setParameter(context->ctx_c, ZSTD_c_contentSizeFlag, 0);
if (ZSTD_isError(r))
goto err;
return context;
err:
ZSTD_freeCCtx(context->ctx_c);
ZSTD_freeDCtx(context->ctx_d);
free(context);
return NULL;
}
static void free_zstd_context(void *ctx)
{
struct zstd_context *context = ctx;
if (!ctx)
return;
ZSTD_freeCCtx(context->ctx_c);
ZSTD_freeDCtx(context->ctx_d);
free(context);
}
int tracecmd_zstd_init(void)
{
struct tracecmd_compression_proto proto;
memset(&proto, 0, sizeof(proto));
proto.name = __ZSTD_NAME;
proto.version = ZSTD_versionString();
proto.weight = __ZSTD_WEIGTH;
proto.compress = zstd_compress;
proto.uncompress = zstd_decompress;
proto.is_supported = zstd_is_supported;
proto.compress_size = zstd_compress_bound;
proto.new_context = new_zstd_context;
proto.free_context = free_zstd_context;
return tracecmd_compress_proto_register(&proto);
}
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