+/*
+ memory-stream.cc -- implement Memory_out_stream
+
+ source file of the GNU LilyPond music typesetter
+
+ (c) 2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
+
+*/
+
+#include <assert.h>
+#include <string.h>
+#include <stdlib.h>
+#include <libio.h>
+#include "memory-stream.hh"
+
+const int Memory_out_stream::block_size_ = 1024;
+
+cookie_io_functions_t
+Memory_out_stream::functions_ = {
+ Memory_out_stream::reader,
+ Memory_out_stream::writer,
+ Memory_out_stream::seeker,
+ Memory_out_stream::cleaner
+};
+
+int
+Memory_out_stream::cleaner (void *cookie)
+{
+ Memory_out_stream *stream = (Memory_out_stream*) cookie;
+
+ stream->file_ = 0;
+ return 0;
+}
+
+Memory_out_stream::Memory_out_stream ()
+{
+ size_ = 0;
+ buffer_ = 0;
+ buffer_blocks_ = 0;
+ file_ = fopencookie ((void*) this, "w", functions_);
+}
+
+Memory_out_stream::~Memory_out_stream()
+{
+ if (file_)
+ fclose (file_);
+
+ free (buffer_);
+}
+
+FILE*
+Memory_out_stream::get_file () const
+{
+ return file_;
+}
+
+ssize_t
+Memory_out_stream::get_length () const
+{
+ return size_;
+}
+
+const char *
+Memory_out_stream::get_string () const
+{
+ return buffer_;
+}
+
+
+ssize_t
+Memory_out_stream::writer (void *cookie,
+ const char *buffer,
+ size_t size)
+{
+ Memory_out_stream * stream = (Memory_out_stream*) cookie;
+
+ ssize_t newsize = stream->size_ + size;
+
+ bool change = false;
+ while (newsize > stream->buffer_blocks_ * block_size_)
+ {
+ stream->buffer_blocks_ *= 2;
+ stream->buffer_blocks_ += 1;
+ change = true;
+ }
+
+ if (change)
+ stream->buffer_ = (char*) realloc (stream->buffer_, stream->buffer_blocks_ * block_size_);
+
+ memcpy (stream->buffer_ + stream->size_, buffer, size);
+ stream->size_ = newsize;
+
+ return size;
+}
+
+
+ssize_t
+Memory_out_stream::reader (void *cookie,
+ char *buffer,
+ size_t size)
+{
+ (void) cookie;
+ (void) buffer;
+ (void) size;
+
+ assert (false);
+}
+
+
+int
+Memory_out_stream::seeker (void*, off64_t *, int whence)
+{
+ assert (false);
+ (void)whence;
+ return 0;
+}
projects / lilypond.git / commitdiff