1 files changed, 75 insertions, 0 deletions
diff --git a/source/fitz/compressed-buffer.c b/source/fitz/compressed-buffer.c
new file mode 100644
index 00000000..acdf2747
--- /dev/null
+++ b/source/fitz/compressed-buffer.c
@@ -0,0 +1,75 @@
+#include "mupdf/fitz.h"
+
+/* This code needs to be kept out of stm_buffer.c to avoid it being
+ * pulled into cmapdump.c */
+
+void
+fz_free_compressed_buffer(fz_context *ctx, fz_compressed_buffer *buf)
+{
+	if (!buf)
+		return;
+
+	fz_drop_buffer(ctx, buf->buffer);
+	fz_free(ctx, buf);
+}
+
+fz_stream *
+fz_open_image_decomp_stream(fz_context *ctx, fz_compressed_buffer *buffer, int *l2factor)
+{
+	fz_stream *chain = fz_open_buffer(ctx, buffer->buffer);
+	fz_compression_params *params = &buffer->params;
+
+	switch (params->type)
+	{
+	case FZ_IMAGE_FAX:
+		*l2factor = 0;
+		return fz_open_faxd(chain,
+				params->u.fax.k,
+				params->u.fax.end_of_line,
+				params->u.fax.encoded_byte_align,
+				params->u.fax.columns,
+				params->u.fax.rows,
+				params->u.fax.end_of_block,
+				params->u.fax.black_is_1);
+	case FZ_IMAGE_JPEG:
+		if (*l2factor > 3)
+			*l2factor = 3;
+		return fz_open_resized_dctd(chain, params->u.jpeg.color_transform, *l2factor);
+	case FZ_IMAGE_RLD:
+		*l2factor = 0;
+		return fz_open_rld(chain);
+	case FZ_IMAGE_FLATE:
+		*l2factor = 0;
+		chain = fz_open_flated(chain);
+		if (params->u.flate.predictor > 1)
+			chain = fz_open_predict(chain, params->u.flate.predictor, params->u.flate.columns, params->u.flate.colors, params->u.flate.bpc);
+		return chain;
+	case FZ_IMAGE_LZW:
+		*l2factor = 0;
+		chain = fz_open_lzwd(chain, params->u.lzw.early_change);
+		if (params->u.lzw.predictor > 1)
+			chain = fz_open_predict(chain, params->u.lzw.predictor, params->u.lzw.columns, params->u.lzw.colors, params->u.lzw.bpc);
+		return chain;
+	default:
+		*l2factor = 0;
+		break;
+	}
+
+	return chain;
+}
+
+fz_stream *
+fz_open_compressed_buffer(fz_context *ctx, fz_compressed_buffer *buffer)
+{
+	int l2factor = 0;
+
+	return fz_open_image_decomp_stream(ctx, buffer, &l2factor);
+}
+
+unsigned int
+fz_compressed_buffer_size(fz_compressed_buffer *buffer)
+{
+	if (!buffer || !buffer->buffer)
+		return 0;
+	return (unsigned int)buffer->buffer->cap;
+}