From f7b993d5aff1274e010d45304b12109f6de7e120 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sun, 28 Jun 2020 19:46:47 +0200
Subject: WIP: Make Writer always write to a ByteSink

---
 src/byte_sink.h | 76 ++++++++++++++++++++-------------------------------------
 1 file changed, 26 insertions(+), 50 deletions(-)

(limited to 'src/byte_sink.h')

diff --git a/src/byte_sink.h b/src/byte_sink.h
index 576f9c2e..abbe55ff 100644
--- a/src/byte_sink.h
+++ b/src/byte_sink.h
@@ -17,80 +17,56 @@
 #ifndef SERD_BYTE_SINK_H
 #define SERD_BYTE_SINK_H
 
-#include "serd_internal.h"
-#include "system.h"
-
 #include "serd/serd.h"
 
 #include <stddef.h>
 #include <string.h>
 
-typedef struct SerdByteSinkImpl {
-  SerdWriteFunc sink;
-  void*         stream;
-  char*         buf;
-  size_t        size;
-  size_t        block_size;
-} SerdByteSink;
-
-static inline SerdByteSink
-serd_byte_sink_new(SerdWriteFunc sink, void* stream, size_t block_size)
-{
-  SerdByteSink bsink;
-  bsink.sink       = sink;
-  bsink.stream     = stream;
-  bsink.size       = 0;
-  bsink.block_size = block_size;
-  bsink.buf =
-    ((block_size > 1) ? (char*)serd_allocate_buffer(block_size) : NULL);
-  return bsink;
-}
-
-static inline void
-serd_byte_sink_flush(SerdByteSink* bsink)
-{
-  if (bsink->block_size > 1 && bsink->size > 0) {
-    bsink->sink(bsink->buf, 1, bsink->size, bsink->stream);
-    bsink->size = 0;
-  }
-}
-
-static inline void
-serd_byte_sink_free(SerdByteSink* bsink)
-{
-  serd_byte_sink_flush(bsink);
-  serd_free_aligned(bsink->buf);
-  bsink->buf = NULL;
-}
+typedef enum {
+  TO_BUFFER,   ///< Writing to a user-provided buffer
+  TO_FILENAME, ///< Writing to a file we opened
+  TO_FILE,     ///< Writing to a user-provided file
+  TO_FUNCTION, ///< Writing to a user-provided function
+} SerdByteSinkType;
+
+struct SerdByteSinkImpl {
+  SerdWriteFunc    write_func; ///< User sink for TO_FUNCTION
+  void*            stream;     ///< Handle for TO_FILE* and TO_FUNCTION
+  char*            buf;        ///< Local buffer iff block_size > 1
+  size_t           size;       ///< Bytes written so far in this chunk
+  size_t           block_size; ///< Size of chunks to write
+  SerdByteSinkType type;       ///< Type of output
+};
 
 static inline size_t
-serd_byte_sink_write(const void* buf, size_t len, SerdByteSink* bsink)
+serd_byte_sink_write(const void* buf, size_t len, SerdByteSink* const sink)
 {
   if (len == 0) {
     return 0;
   }
 
-  if (bsink->block_size == 1) {
-    return bsink->sink(buf, 1, len, bsink->stream);
+  if (sink->block_size == 1) {
+    return sink->write_func(buf, 1, len, sink->stream);
   }
 
   const size_t orig_len = len;
   while (len) {
-    const size_t space = bsink->block_size - bsink->size;
-    const size_t n     = MIN(space, len);
+    const size_t space = sink->block_size - sink->size;
+    const size_t n     = space < len ? space : len;
 
     // Write as much as possible into the remaining buffer space
-    memcpy(bsink->buf + bsink->size, buf, n);
-    bsink->size += n;
+    memcpy(sink->buf + sink->size, buf, n);
+    sink->size += n;
     buf = (const char*)buf + n;
     len -= n;
 
     // Flush page if buffer is full
-    if (bsink->size == bsink->block_size) {
-      bsink->sink(bsink->buf, 1, bsink->block_size, bsink->stream);
-      bsink->size = 0;
+    if (sink->size == sink->block_size) {
+      sink->write_func(sink->buf, 1, sink->block_size, sink->stream);
+      sink->size = 0;
     }
   }
+
   return orig_len;
 }
 
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