1 files changed, 109 insertions, 0 deletions
diff --git a/src/basic/compress.h b/src/basic/compress.h
new file mode 100644
index 0000000..1b5c645
--- /dev/null
+++ b/src/basic/compress.h
@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <unistd.h>
+
+typedef enum Compression {
+        COMPRESSION_NONE,
+        COMPRESSION_XZ,
+        COMPRESSION_LZ4,
+        COMPRESSION_ZSTD,
+        _COMPRESSION_MAX,
+        _COMPRESSION_INVALID = -EINVAL,
+} 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,
+                      void *dst, size_t dst_alloc_size, size_t *dst_size);
+int compress_blob_zstd(const void *src, uint64_t src_size,
+                       void *dst, size_t dst_alloc_size, size_t *dst_size);
+
+int decompress_blob_xz(const void *src, uint64_t src_size,
+                       void **dst, size_t* dst_size, size_t dst_max);
+int decompress_blob_lz4(const void *src, uint64_t src_size,
+                        void **dst, size_t* dst_size, size_t dst_max);
+int decompress_blob_zstd(const void *src, uint64_t src_size,
+                        void **dst, size_t* dst_size, size_t dst_max);
+int decompress_blob(Compression compression,
+                    const void *src, uint64_t src_size,
+                    void **dst, size_t* dst_size, size_t dst_max);
+
+int decompress_startswith_xz(const void *src, uint64_t src_size,
+                             void **buffer,
+                             const void *prefix, size_t prefix_len,
+                             uint8_t extra);
+int decompress_startswith_lz4(const void *src, uint64_t src_size,
+                              void **buffer,
+                              const void *prefix, size_t prefix_len,
+                              uint8_t extra);
+int decompress_startswith_zstd(const void *src, uint64_t src_size,
+                               void **buffer,
+                               const void *prefix, size_t prefix_len,
+                               uint8_t extra);
+int decompress_startswith(Compression compression,
+                          const void *src, uint64_t src_size,
+                          void **buffer,
+                          const void *prefix, size_t prefix_len,
+                          uint8_t extra);
+
+int compress_stream_xz(int fdf, int fdt, uint64_t max_bytes, uint64_t *ret_uncompressed_size);
+int compress_stream_lz4(int fdf, int fdt, uint64_t max_bytes, uint64_t *ret_uncompressed_size);
+int compress_stream_zstd(int fdf, int fdt, uint64_t max_bytes, uint64_t *ret_uncompressed_size);
+
+int decompress_stream_xz(int fdf, int fdt, uint64_t max_size);
+int decompress_stream_lz4(int fdf, int fdt, uint64_t max_size);
+int decompress_stream_zstd(int fdf, int fdt, uint64_t max_size);
+
+static inline int compress_blob(
+                Compression compression,
+                const void *src, uint64_t src_size,
+                void *dst, size_t dst_alloc_size, size_t *dst_size) {
+
+        switch (compression) {
+        case COMPRESSION_ZSTD:
+                return compress_blob_zstd(src, src_size, dst, dst_alloc_size, dst_size);
+        case COMPRESSION_LZ4:
+                return compress_blob_lz4(src, src_size, dst, dst_alloc_size, dst_size);
+        case COMPRESSION_XZ:
+                return compress_blob_xz(src, src_size, dst, dst_alloc_size, dst_size);
+        default:
+                return -EOPNOTSUPP;
+        }
+}
+
+static inline int compress_stream(int fdf, int fdt, uint64_t max_bytes, uint64_t *ret_uncompressed_size) {
+        switch (DEFAULT_COMPRESSION) {
+        case COMPRESSION_ZSTD:
+                return compress_stream_zstd(fdf, fdt, max_bytes, ret_uncompressed_size);
+        case COMPRESSION_LZ4:
+                return compress_stream_lz4(fdf, fdt, max_bytes, ret_uncompressed_size);
+        case COMPRESSION_XZ:
+                return compress_stream_xz(fdf, fdt, max_bytes, ret_uncompressed_size);
+        default:
+                return -EOPNOTSUPP;
+        }
+}
+
+static inline const char* default_compression_extension(void) {
+        switch (DEFAULT_COMPRESSION) {
+        case COMPRESSION_ZSTD:
+                return ".zst";
+        case COMPRESSION_LZ4:
+                return ".lz4";
+        case COMPRESSION_XZ:
+                return ".xz";
+        default:
+                return "";
+        }
+}
+
+int decompress_stream(const char *filename, int fdf, int fdt, uint64_t max_bytes);