[buffer] Move buffer serialization code to a new file
diff --git a/src/hb-buffer-serialize.cc b/src/hb-buffer-serialize.cc
new file mode 100644
index 0000000..b956116
--- /dev/null
+++ b/src/hb-buffer-serialize.cc
@@ -0,0 +1,251 @@
+/*
+ * Copyright © 2012,2013 Google, Inc.
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb-buffer-private.hh"
+
+
+static const char *serialize_formats[] = {
+ "text",
+ "json",
+ NULL
+};
+
+const char **
+hb_buffer_serialize_list_formats (void)
+{
+ return serialize_formats;
+}
+
+hb_buffer_serialize_format_t
+hb_buffer_serialize_format_from_string (const char *str, int len)
+{
+ /* Upper-case it. */
+ return (hb_buffer_serialize_format_t) (hb_tag_from_string (str, len) & ~0x20202020);
+}
+
+const char *
+hb_buffer_serialize_format_to_string (hb_buffer_serialize_format_t format)
+{
+ switch (format)
+ {
+ case HB_BUFFER_SERIALIZE_FORMAT_TEXT: return serialize_formats[0];
+ case HB_BUFFER_SERIALIZE_FORMAT_JSON: return serialize_formats[1];
+ default:
+ case HB_BUFFER_SERIALIZE_FORMAT_INVALID: return NULL;
+ }
+}
+
+static unsigned int
+_hb_buffer_serialize_glyphs_json (hb_buffer_t *buffer,
+ unsigned int start,
+ unsigned int end,
+ char *buf,
+ unsigned int buf_size,
+ unsigned int *buf_consumed,
+ hb_font_t *font,
+ hb_buffer_serialize_flags_t flags)
+{
+ hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, NULL);
+ hb_glyph_position_t *pos = hb_buffer_get_glyph_positions (buffer, NULL);
+
+ *buf_consumed = 0;
+ for (unsigned int i = start; i < end; i++)
+ {
+ char b[1024];
+ char *p = b;
+
+ /* In the following code, we know b is large enough that no overflow can happen. */
+
+#define APPEND(s) HB_STMT_START { strcpy (p, s); p += strlen (s); } HB_STMT_END
+
+ if (i)
+ *p++ = ',';
+
+ *p++ = '{';
+
+ APPEND ("\"g\":");
+ if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES))
+ {
+ char g[128];
+ hb_font_glyph_to_string (font, info[i].codepoint, g, sizeof (g));
+ *p++ = '"';
+ for (char *q = g; *q; q++) {
+ if (*q == '"')
+ *p++ = '\\';
+ *p++ = *q;
+ }
+ *p++ = '"';
+ }
+ else
+ p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "%u", info[i].codepoint);
+
+ if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS)) {
+ p += snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"cl\":%u", info[i].cluster);
+ }
+
+ if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
+ {
+ p += snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"dx\":%d,\"dy\":%d",
+ pos[i].x_offset, pos[i].y_offset);
+ p += snprintf (p, ARRAY_LENGTH (b) - (p - b), ",\"ax\":%d,\"ay\":%d",
+ pos[i].x_advance, pos[i].y_advance);
+ }
+
+ *p++ = '}';
+
+ if (buf_size > (p - b))
+ {
+ unsigned int l = p - b;
+ memcpy (buf, b, l);
+ buf += l;
+ buf_size -= l;
+ *buf_consumed += l;
+ *buf = '\0';
+ } else
+ return i - start;
+ }
+
+ return end - start;
+}
+
+static unsigned int
+_hb_buffer_serialize_glyphs_text (hb_buffer_t *buffer,
+ unsigned int start,
+ unsigned int end,
+ char *buf,
+ unsigned int buf_size,
+ unsigned int *buf_consumed,
+ hb_font_t *font,
+ hb_buffer_serialize_flags_t flags)
+{
+ hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, NULL);
+ hb_glyph_position_t *pos = hb_buffer_get_glyph_positions (buffer, NULL);
+ hb_direction_t direction = hb_buffer_get_direction (buffer);
+
+ *buf_consumed = 0;
+ for (unsigned int i = start; i < end; i++)
+ {
+ char b[1024];
+ char *p = b;
+
+ /* In the following code, we know b is large enough that no overflow can happen. */
+
+ if (i)
+ *p++ = '|';
+
+ if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES))
+ {
+ hb_font_glyph_to_string (font, info[i].codepoint, p, 128);
+ p += strlen (p);
+ }
+ else
+ p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "%u", info[i].codepoint);
+
+ if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS)) {
+ p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "=%u", info[i].cluster);
+ }
+
+ if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
+ {
+ if (pos[i].x_offset || pos[i].y_offset)
+ p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "@%d,%d", pos[i].x_offset, pos[i].y_offset);
+
+ *p++ = '+';
+ if (HB_DIRECTION_IS_HORIZONTAL (direction) || pos[i].x_advance)
+ p += snprintf (p, ARRAY_LENGTH (b) - (p - b), "%d", pos[i].x_advance);
+ if (HB_DIRECTION_IS_VERTICAL (direction) || pos->y_advance)
+ p += snprintf (p, ARRAY_LENGTH (b) - (p - b), ",%d", pos[i].y_advance);
+ }
+
+ if (buf_size > (p - b))
+ {
+ unsigned int l = p - b;
+ memcpy (buf, b, l);
+ buf += l;
+ buf_size -= l;
+ *buf_consumed += l;
+ *buf = '\0';
+ } else
+ return i - start;
+ }
+
+ return end - start;
+}
+
+/* Returns number of items, starting at start, that were serialized. */
+unsigned int
+hb_buffer_serialize_glyphs (hb_buffer_t *buffer,
+ unsigned int start,
+ unsigned int end,
+ char *buf,
+ unsigned int buf_size,
+ unsigned int *buf_consumed,
+ hb_font_t *font, /* May be NULL */
+ hb_buffer_serialize_format_t format,
+ hb_buffer_serialize_flags_t flags)
+{
+ assert (start <= end && end <= buffer->len);
+
+ *buf_consumed = 0;
+
+ assert ((!buffer->len && buffer->content_type == HB_BUFFER_CONTENT_TYPE_INVALID) ||
+ buffer->content_type == HB_BUFFER_CONTENT_TYPE_GLYPHS);
+
+ if (unlikely (start == end))
+ return 0;
+
+ if (!font)
+ font = hb_font_get_empty ();
+
+ switch (format)
+ {
+ case HB_BUFFER_SERIALIZE_FORMAT_TEXT:
+ return _hb_buffer_serialize_glyphs_text (buffer, start, end,
+ buf, buf_size, buf_consumed,
+ font, flags);
+
+ case HB_BUFFER_SERIALIZE_FORMAT_JSON:
+ return _hb_buffer_serialize_glyphs_json (buffer, start, end,
+ buf, buf_size, buf_consumed,
+ font, flags);
+
+ default:
+ case HB_BUFFER_SERIALIZE_FORMAT_INVALID:
+ return 0;
+
+ }
+}
+
+hb_bool_t
+hb_buffer_deserialize_glyphs (hb_buffer_t *buffer,
+ const char *buf,
+ unsigned int buf_len,
+ unsigned int *buf_consumed,
+ hb_font_t *font, /* May be NULL */
+ hb_buffer_serialize_format_t format)
+{
+ return false;
+}
