libropkg: implement compressed file streams and tar-writer functionality

libropkg/include/ropkg/compress.h

@@ -0,0 +1,53 @@
+#ifndef ROPKG_COMPRESS_H_
+#define ROPKG_COMPRESS_H_
+
+#include <ropkg/misc.h>
+#include <ropkg/status.h>
+#include <stddef.h>
+
+struct ropkg_compression_function;
+struct ropkg_compression_stream;
+
+enum ropkg_compression_stream_mode {
+	ROPKG_COMPRESSION_MODE_COMPRESS = 0,
+	ROPKG_COMPRESSION_MODE_DECOMPRESS,
+};
+
+enum ropkg_compression_stream_op {
+	ROPKG_COMPRESSION_OP_CONTINUE = 0,
+	ROPKG_COMPRESSION_OP_END,
+};
+
+enum ropkg_compression_type {
+	ROPKG_COMPRESSION_NONE = 0,
+	ROPKG_COMPRESSION_ZSTD,
+};
+
+ROPKG_API const struct ropkg_compression_function *
+ropkg_compression_function_for_type(enum ropkg_compression_type type);
+
+ROPKG_API enum ropkg_status ropkg_compression_function_get_buffer_size(
+	const struct ropkg_compression_function *func,
+	enum ropkg_compression_stream_mode mode,
+	size_t *in_buffer_size,
+	size_t *out_buffer_size);
+ROPKG_API const char *ropkg_compression_function_get_file_extension(
+	const struct ropkg_compression_function *func);
+
+ROPKG_API enum ropkg_status ropkg_compression_stream_open(
+	const struct ropkg_compression_function *func,
+	void *in_buffer,
+	size_t in_max,
+	void *out_buffer,
+	size_t out_max,
+	enum ropkg_compression_stream_mode mode,
+	struct ropkg_compression_stream **out);
+ROPKG_API enum ropkg_status ropkg_compression_stream_process(
+	struct ropkg_compression_stream *stream,
+	size_t in_size,
+	enum ropkg_compression_stream_op op,
+	size_t *out_size);
+ROPKG_API enum ropkg_status ropkg_compression_stream_close(
+	struct ropkg_compression_stream *stream);
+
+#endif

libropkg/include/ropkg/misc.h

@@ -0,0 +1,18 @@
+#ifndef ROPKG_MISC_H_
+#define ROPKG_MISC_H_
+
+#ifdef _MSC_VER
+#ifdef LIBROPKG_STATIC
+#define ROPKG_API extern
+#else
+#ifdef LIBROPKG_EXPORT
+#define ROPKG_API extern __declspec(dllexport)
+#else
+#define ROPKG_API extern __declspec(dllimport)
+#endif
+#endif
+#else
+#define ROPKG_API extern
+#endif
+
+#endif

libropkg/include/ropkg/status.h

@@ -0,0 +1,14 @@
+#ifndef ROPKG_STATUS_H_
+#define ROPKG_STATUS_H_
+
+enum ropkg_status {
+	ROPKG_SUCCESS = 0,
+	ROPKG_ERR_NOT_SUPPORTED,
+	ROPKG_ERR_INVALID_ARGUMENT,
+	ROPKG_ERR_NO_MEMORY,
+	ROPKG_ERR_BAD_STATE,
+	ROPKG_ERR_INTERNAL_FAILURE,
+	ROPKG_ERR_IO_FAILURE,
+};
+
+#endif

libropkg/include/ropkg/stream.h

@@ -0,0 +1,58 @@
+#ifndef ROPKG_STREAM_H_
+#define ROPKG_STREAM_H_
+
+#include <ropkg/misc.h>
+#include <ropkg/status.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+struct ropkg_stream;
+struct ropkg_compression_function;
+
+enum ropkg_stream_mode {
+	ROPKG_STREAM_READ,
+	ROPKG_STREAM_WRITE,
+};
+
+ROPKG_API enum ropkg_status ropkg_stream_open(
+	FILE *fp,
+	const struct ropkg_compression_function *func,
+	enum ropkg_stream_mode mode,
+	struct ropkg_stream **out);
+ROPKG_API enum ropkg_status ropkg_stream_close(struct ropkg_stream *stream);
+
+ROPKG_API enum ropkg_status ropkg_stream_begin_compressed_section(
+	struct ropkg_stream *stream);
+ROPKG_API enum ropkg_status ropkg_stream_end_compressed_section(
+	struct ropkg_stream *stream,
+	size_t *out_nr_written_compressed,
+	size_t *out_nr_written_uncompressed);
+
+ROPKG_API enum ropkg_status ropkg_stream_read(
+	struct ropkg_stream *stream,
+	void *p,
+	size_t len,
+	size_t *nr_read);
+ROPKG_API enum ropkg_status ropkg_stream_write(
+	struct ropkg_stream *stream,
+	const void *p,
+	size_t len,
+	size_t *nr_written);
+
+ROPKG_API size_t ropkg_stream_get_cursor_position(struct ropkg_stream *stream);
+ROPKG_API enum ropkg_status ropkg_stream_set_cursor_position(
+	struct ropkg_stream *stream,
+	size_t pos);
+ROPKG_API enum ropkg_status ropkg_stream_restore_cursor_position(
+	struct ropkg_stream *stream);
+
+ROPKG_API bool ropkg_stream_is_in_compressed_section(
+	struct ropkg_stream *stream);
+
+ROPKG_API size_t ropkg_stream_get_nr_written(struct ropkg_stream *stream);
+ROPKG_API size_t
+ropkg_stream_get_nr_written_compressed(struct ropkg_stream *stream);
+ROPKG_API size_t
+ropkg_stream_get_nr_written_uncompressed(struct ropkg_stream *stream);
+
+#endif

libropkg/include/ropkg/writer.h

@@ -0,0 +1,36 @@
+#ifndef ROPKG_WRITER_H_
+#define ROPKG_WRITER_H_
+
+#include <ropkg/misc.h>
+#include <ropkg/status.h>
+#include <stdio.h>
+
+#define ROPKG_PATH_DATA    "data.tar"
+#define ROPKG_PATH_CONTROL "control.tar"
+#define ROPKG_PATH_META    "meta.tar"
+
+struct ropkg_writer;
+struct ropkg_stream;
+
+struct ropkg_writer_file_info {
+	size_t f_length;
+};
+
+ROPKG_API enum ropkg_status ropkg_writer_open(
+	struct ropkg_stream *fp,
+	struct ropkg_writer **out);
+ROPKG_API enum ropkg_status ropkg_writer_close(struct ropkg_writer *pkg);
+
+ROPKG_API enum ropkg_status ropkg_writer_begin_file(
+	struct ropkg_writer *pkg,
+	const char *path,
+	const struct ropkg_writer_file_info *info);
+ROPKG_API enum ropkg_status ropkg_writer_end_file(struct ropkg_writer *pkg);
+
+ROPKG_API enum ropkg_status ropkg_writer_write(
+	struct ropkg_writer *pkg,
+	const void *p,
+	size_t len,
+	size_t *nr_written);
+
+#endif