Merge file_write() from libbluray

src/file/file.h

@@ -42,6 +42,7 @@
 #define file_seek(X,Y,Z) X->seek(X,Y,Z)
 #define file_tell(X)     X->tell(X)
 #define file_read(X,Y,Z) X->read(X,Y,Z)
+#define file_write(X,Y,Z) X->write(X,Y,Z)
 BD_PRIVATE int64_t file_size(AACS_FILE_H *fp);
 
 BD_PRIVATE extern AACS_FILE_H *(*file_open)(const char* filename, const char *mode);

src/file/file_posix.c

@@ -87,6 +87,28 @@ static int64_t _file_read(AACS_FILE_H *file, uint8_t *buf, int64_t size)
     return (int64_t)got;
 }
 
+static int64_t _file_write(AACS_FILE_H *file, const uint8_t *buf, int64_t size)
+{
+    ssize_t written, result;
+
+    if (size <= 0 || size >= BD_MAX_SSIZE) {
+        BD_DEBUG(DBG_FILE | DBG_CRIT, "Ignoring invalid write of size %"PRId64" (%p)\n", size, (void*)file);
+        return 0;
+    }
+
+    for (written = 0; written < (ssize_t)size; written += result) {
+        result = write((int)(intptr_t)file->internal, buf + written, size - written);
+        if (result < 0) {
+            if (errno != EINTR) {
+                BD_DEBUG(DBG_FILE, "write() failed (%p)\n", (void*)file);
+                break;
+            }
+            result = 0;
+        }
+    }
+    return (int64_t)written;
+}
+
 static AACS_FILE_H *_file_open(const char* filename, const char *cmode)
 {
     AACS_FILE_H *file;
@@ -123,6 +145,7 @@ static AACS_FILE_H *_file_open(const char* filename, const char *cmode)
     file->close = _file_close;
     file->seek  = _file_seek;
     file->read  = _file_read;
+    file->write = _file_write;
     file->tell  = _file_tell;
 
     file->internal = (void*)(intptr_t)fd;

src/file/file_win32.c

@@ -75,6 +75,16 @@ static int64_t _file_read(AACS_FILE_H *file, uint8_t *buf, int64_t size)
     return 0;
 }
 
+static int64_t _file_write(AACS_FILE_H *file, const uint8_t *buf, int64_t size)
+{
+    if (size > 0 && size < BD_MAX_SSIZE) {
+        return (int64_t)fwrite(buf, 1, (size_t)size, (FILE *)file->internal);
+    }
+
+    BD_DEBUG(DBG_FILE | DBG_CRIT, "Ignoring invalid write of size %"PRId64" (%p)\n", size, (void*)file);
+    return 0;
+}
+
 static AACS_FILE_H *_file_open(const char* filename, const char *mode)
 {
     AACS_FILE_H *file;
@@ -105,6 +115,7 @@ static AACS_FILE_H *_file_open(const char* filename, const char *mode)
     file->close    = _file_close;
     file->seek     = _file_seek;
     file->read     = _file_read;
+    file->write    = _file_write;
     file->tell     = _file_tell;
 
     BD_DEBUG(DBG_FILE, "Opened WIN32 file %s (%p)\n", filename, (void*)file);