systemd/SOURCES/0240-compress-introduce-compression_supported-helper-func.patch

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2023-06-23 12:24:58 +00:00
From c926e4ff48022a71665e7e7833fd59a1bf2ad5fb Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 4 Apr 2023 14:34:32 +0900
Subject: [PATCH] compress: introduce compression_supported() helper function
(cherry picked from commit 83f3d73da8d132773dd91aae0fa7babb74920774)
Resolves: #2184929
---
src/basic/compress.c | 10 ++++++++++
src/basic/compress.h | 3 +++
2 files changed, 13 insertions(+)
diff --git a/src/basic/compress.c b/src/basic/compress.c
index 1e94635397..dce0ebf222 100644
--- a/src/basic/compress.c
+++ b/src/basic/compress.c
@@ -66,6 +66,16 @@ static const char* const compression_table[_COMPRESSION_MAX] = {
DEFINE_STRING_TABLE_LOOKUP(compression, Compression);
+bool compression_supported(Compression c) {
+ static const unsigned supported =
+ (1U << COMPRESSION_NONE) |
+ (1U << COMPRESSION_XZ) * HAVE_XZ |
+ (1U << COMPRESSION_LZ4) * HAVE_LZ4 |
+ (1U << COMPRESSION_ZSTD) * HAVE_ZSTD;
+
+ return c >= 0 && c < _COMPRESSION_MAX && FLAGS_SET(supported, 1U << c);
+}
+
int compress_blob_xz(const void *src, uint64_t src_size,
void *dst, size_t dst_alloc_size, size_t *dst_size) {
#if HAVE_XZ
diff --git a/src/basic/compress.h b/src/basic/compress.h
index 583b105c66..2201bca74c 100644
--- a/src/basic/compress.h
+++ b/src/basic/compress.h
@@ -2,6 +2,7 @@
#pragma once
#include <errno.h>
+#include <stdbool.h>
#include <stdint.h>
#include <unistd.h>
@@ -17,6 +18,8 @@ typedef enum Compression {
const char* compression_to_string(Compression compression);
Compression compression_from_string(const char *compression);
+bool compression_supported(Compression c);
+
int compress_blob_xz(const void *src, uint64_t src_size,
void *dst, size_t dst_alloc_size, size_t *dst_size);
int compress_blob_lz4(const void *src, uint64_t src_size,