Rearrange source files.

1 files changed, 111 insertions, 0 deletions

diff --git a/source/fitz/load-jpeg.c b/source/fitz/load-jpeg.c
new file mode 100644
index 00000000..b968c0cf
--- /dev/null
+++ b/source/fitz/load-jpeg.c
@@ -0,0 +1,111 @@
+#include "mupdf/fitz.h"
+
+#include <jpeglib.h>
+
+static void error_exit(j_common_ptr cinfo)
+{
+	char msg[JMSG_LENGTH_MAX];
+	fz_context *ctx = (fz_context *)cinfo->client_data;
+
+	cinfo->err->format_message(cinfo, msg);
+	fz_throw(ctx, FZ_ERROR_GENERIC, "jpeg error: %s", msg);
+}
+
+static void init_source(j_decompress_ptr cinfo)
+{
+	/* nothing to do */
+}
+
+static void term_source(j_decompress_ptr cinfo)
+{
+	/* nothing to do */
+}
+
+static boolean fill_input_buffer(j_decompress_ptr cinfo)
+{
+	static unsigned char eoi[2] = { 0xFF, JPEG_EOI };
+	struct jpeg_source_mgr *src = cinfo->src;
+	src->next_input_byte = eoi;
+	src->bytes_in_buffer = 2;
+	return 1;
+}
+
+static void skip_input_data(j_decompress_ptr cinfo, long num_bytes)
+{
+	struct jpeg_source_mgr *src = cinfo->src;
+	if (num_bytes > 0)
+	{
+		size_t skip = (size_t)num_bytes; /* size_t may be 64bit */
+		if (skip > src->bytes_in_buffer)
+			skip = (size_t)src->bytes_in_buffer;
+		src->next_input_byte += skip;
+		src->bytes_in_buffer -= skip;
+	}
+}
+
+void
+fz_load_jpeg_info(fz_context *ctx, unsigned char *rbuf, int rlen, int *xp, int *yp, int *xresp, int *yresp, fz_colorspace **cspacep)
+{
+	struct jpeg_decompress_struct cinfo;
+	struct jpeg_error_mgr err;
+	struct jpeg_source_mgr src;
+
+	fz_try(ctx)
+	{
+		cinfo.client_data = ctx;
+		cinfo.err = jpeg_std_error(&err);
+		err.error_exit = error_exit;
+
+		jpeg_create_decompress(&cinfo);
+
+		cinfo.src = &src;
+		src.init_source = init_source;
+		src.fill_input_buffer = fill_input_buffer;
+		src.skip_input_data = skip_input_data;
+		src.resync_to_restart = jpeg_resync_to_restart;
+		src.term_source = term_source;
+		src.next_input_byte = rbuf;
+		src.bytes_in_buffer = rlen;
+
+		jpeg_read_header(&cinfo, 1);
+
+		if (cinfo.num_components == 1)
+			*cspacep = fz_device_gray(ctx);
+		else if (cinfo.num_components == 3)
+			*cspacep = fz_device_rgb(ctx);
+		else if (cinfo.num_components == 4)
+			*cspacep = fz_device_cmyk(ctx);
+		else
+			fz_throw(ctx, FZ_ERROR_GENERIC, "bad number of components in jpeg: %d", cinfo.num_components);
+
+		*xp = cinfo.image_width;
+		*yp = cinfo.image_height;
+
+		if (cinfo.density_unit == 1)
+		{
+			*xresp = cinfo.X_density;
+			*yresp = cinfo.Y_density;
+		}
+		else if (cinfo.density_unit == 2)
+		{
+			*xresp = cinfo.X_density * 254 / 100;
+			*yresp = cinfo.Y_density * 254 / 100;
+		}
+		else
+		{
+			*xresp = 0;
+			*yresp = 0;
+		}
+
+		if (*xresp <= 0) *xresp = 72;
+		if (*yresp <= 0) *yresp = 72;
+	}
+	fz_always(ctx)
+	{
+		jpeg_destroy_decompress(&cinfo);
+	}
+	fz_catch(ctx)
+	{
+		fz_rethrow(ctx);
+	}
+}