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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2023-06-04 14:36:25 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2023-06-04 15:09:05 +0200
commit723306c417b3b0f8e6a3904906d6c5612cace432 (patch)
tree34235c4e6e11a1702e61d81f4f58bc9f3da57c58 /lib/io/src/win32
parent061fbc12fe49ff49088a644def3227d3800cd8a7 (diff)
libio: Move istream_t precache logic into backend implementation
The end goal is to remove direct buffer access from the istream_t interfaces and make that opaque. For the tar implementation, this already safes us needless buffer copying, as we essentially allow the user to read-through from the underlying stream. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/io/src/win32')
-rw-r--r--lib/io/src/win32/istream.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/lib/io/src/win32/istream.c b/lib/io/src/win32/istream.c
index be3d829..918b868 100644
--- a/lib/io/src/win32/istream.c
+++ b/lib/io/src/win32/istream.c
@@ -23,6 +23,21 @@ static int file_precache(istream_t *strm)
DWORD diff, actual;
HANDLE hnd;
+ if (strm->buffer_offset >= strm->buffer_used) {
+ strm->buffer_offset = 0;
+ strm->buffer_used = 0;
+ } else if (strm->buffer_offset > 0) {
+ memmove(strm->buffer,
+ strm->buffer + strm->buffer_offset,
+ strm->buffer_used - strm->buffer_offset);
+
+ strm->buffer_used -= strm->buffer_offset;
+ strm->buffer_offset = 0;
+ }
+
+ if (strm->eof)
+ return 0;
+
hnd = file->path == NULL ? GetStdHandle(STD_INPUT_HANDLE) : file->hnd;
while (strm->buffer_used < sizeof(file->buffer)) {