1 files changed, 86 insertions, 0 deletions
diff --git a/src/xz/file_io.h b/src/xz/file_io.h
new file mode 100644
index 00000000..c10554ad
--- /dev/null
+++ b/src/xz/file_io.h
@@ -0,0 +1,86 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       io.h
+/// \brief      I/O types and functions
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+// Some systems have suboptimal BUFSIZ. Use a bit bigger value on them.
+#if BUFSIZ <= 1024
+#	define IO_BUFFER_SIZE 8192
+#else
+#	define IO_BUFFER_SIZE BUFSIZ
+#endif
+
+
+typedef struct {
+	/// Name of the source filename (as given on the command line) or
+	/// pointer to static "(stdin)" when reading from standard input.
+	const char *src_name;
+
+	/// Destination filename converted from src_name or pointer to static
+	/// "(stdout)" when writing to standard output.
+	char *dest_name;
+
+	/// File descriptor of the source file
+	int src_fd;
+
+	/// File descriptor of the target file
+	int dest_fd;
+
+	/// Stat of the source file.
+	struct stat src_st;
+
+	/// Stat of the destination file.
+	struct stat dest_st;
+
+	/// True once end of the source file has been detected.
+	bool src_eof;
+
+} file_pair;
+
+
+/// \brief      Initialize the I/O module
+extern void io_init(void);
+
+
+/// \brief      Opens a file pair
+extern file_pair *io_open(const char *src_name);
+
+
+/// \brief      Closes the file descriptors and frees possible allocated memory
+///
+/// The success argument determines if source or destination file gets
+/// unlinked:
+///  - false: The destination file is unlinked.
+///  - true: The source file is unlinked unless writing to stdout or --keep
+///    was used.
+extern void io_close(file_pair *pair, bool success);
+
+
+/// \brief      Reads from the source file to a buffer
+///
+/// \param      pair    File pair having the source file open for reading
+/// \param      buf     Destination buffer to hold the read data
+/// \param      size    Size of the buffer; assumed be smaller than SSIZE_MAX
+///
+/// \return     On success, number of bytes read is returned. On end of
+///             file zero is returned and pair->src_eof set to true.
+///             On error, SIZE_MAX is returned and error message printed.
+extern size_t io_read(file_pair *pair, uint8_t *buf, size_t size);
+
+
+/// \brief      Writes a buffer to the destination file
+///
+/// \param      pair    File pair having the destination file open for writing
+/// \param      buf     Buffer containing the data to be written
+/// \param      size    Size of the buffer; assumed be smaller than SSIZE_MAX
+///
+/// \return     On success, zero is returned. On error, -1 is returned
+///             and error message printed.
+extern bool io_write(const file_pair *pair, const uint8_t *buf, size_t size);