[PATCH v3 7/9] winedmo: Use the stream context to track stream position.

[Rémi Bernon]

From: Rémi Bernon

---
 dlls/winedmo/main.c    | 2 ++
 dlls/winedmo/unixlib.c | 8 ++++++++
 dlls/winedmo/unixlib.h | 3 ++-
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/dlls/winedmo/main.c b/dlls/winedmo/main.c
index 0c3187697bb..5bd66733d86 100644
--- a/dlls/winedmo/main.c
+++ b/dlls/winedmo/main.c
@@ -28,6 +28,8 @@ static struct stream_context *stream_context_create(void)
     struct stream_context *context;

if (!(context = malloc( sizeof(*context) ))) return NULL;
+    context->length = 0;
+    context->position = 0;

return context;
 }
diff --git a/dlls/winedmo/unixlib.c b/dlls/winedmo/unixlib.c
index 4f5abd9c1a1..dab6b907967 100644
--- a/dlls/winedmo/unixlib.c
+++ b/dlls/winedmo/unixlib.c
@@ -35,23 +35,30 @@ static UINT64 read_callback;
 int64_t unix_seek_callback( void *opaque, int64_t offset, int whence )
 {
     struct seek_callback_params params = {.dispatch = {.callback = seek_callback}, .context = (UINT_PTR)opaque};
+    struct stream_context *context = opaque;
     void *ret_ptr;
     ULONG ret_len;
     int status;

TRACE( "opaque %p, offset %#"PRIx64", whence %#x\n", opaque, offset, whence );

+    if (whence == AVSEEK_SIZE) return context->length;
+    if (whence == SEEK_END) offset += context->length;
+    if (whence == SEEK_CUR) offset += context->position;
+
     params.offset = offset;
     status = KeUserDispatchCallback( &params.dispatch, sizeof(params), &ret_ptr, &ret_len );
     if (status || ret_len != sizeof(UINT64)) return AVERROR( EINVAL );
     offset = *(UINT64 *)ret_ptr;

+    context->position = offset;
     return offset;
 }

int unix_read_callback( void *opaque, uint8_t *buffer, int size )
 {
     struct read_callback_params params = {.dispatch = {.callback = read_callback}, .context = (UINT_PTR)opaque};
+    struct stream_context *context = opaque;
     int status, total;
     void *ret_ptr;
     ULONG ret_len;
@@ -64,6 +71,7 @@ int unix_read_callback( void *opaque, uint8_t *buffer, int size )
     total = *(ULONG *)ret_ptr;

if (!total) return AVERROR_EOF;
+    context->position += total;
     return total;
 }

diff --git a/dlls/winedmo/unixlib.h b/dlls/winedmo/unixlib.h
index 891d401aeb5..e97e47ea259 100644
--- a/dlls/winedmo/unixlib.h
+++ b/dlls/winedmo/unixlib.h
@@ -39,7 +39,8 @@ struct process_attach_params

struct stream_context
 {
-    UINT64 placeholder;
+    UINT64 length;
+    UINT64 position;
 };

struct seek_callback_params