Add 'mutool convert' and new document writer interface.

Only supports CBZ writing for now.

Also add a zip file writer.

1 files changed, 112 insertions, 0 deletions

diff --git a/source/fitz/zip.c b/source/fitz/zip.c
new file mode 100644
index 00000000..285fb635
--- /dev/null
+++ b/source/fitz/zip.c
@@ -0,0 +1,112 @@
+#include "mupdf/fitz.h"
+
+#include <zlib.h>
+
+#if !defined (INT32_MAX)
+#define INT32_MAX 2147483647L
+#endif
+
+#define ZIP_LOCAL_FILE_SIG 0x04034b50
+#define ZIP_CENTRAL_DIRECTORY_SIG 0x02014b50
+#define ZIP_END_OF_CENTRAL_DIRECTORY_SIG 0x06054b50
+
+struct fz_zip_writer_s
+{
+	fz_output *output;
+	fz_buffer *central;
+	int count;
+};
+
+void
+fz_write_zip_entry(fz_context *ctx, fz_zip_writer *zip, const char *name, fz_buffer *buf, int compress)
+{
+	int offset = fz_tell_output(ctx, zip->output);
+	int sum;
+
+	sum = crc32(0, NULL, 0);
+	sum = crc32(sum, buf->data, buf->len);
+
+	fz_write_buffer_int32_le(ctx, zip->central, ZIP_CENTRAL_DIRECTORY_SIG);
+	fz_write_buffer_int16_le(ctx, zip->central, 0); /* version made by: MS-DOS */
+	fz_write_buffer_int16_le(ctx, zip->central, 20); /* version to extract: 2.0 */
+	fz_write_buffer_int16_le(ctx, zip->central, 0); /* general purpose bit flag */
+	fz_write_buffer_int16_le(ctx, zip->central, 0); /* compression method: store */
+	fz_write_buffer_int16_le(ctx, zip->central, 0); /* TODO: last mod file time */
+	fz_write_buffer_int16_le(ctx, zip->central, 0); /* TODO: last mod file date */
+	fz_write_buffer_int32_le(ctx, zip->central, sum); /* crc-32 */
+	fz_write_buffer_int32_le(ctx, zip->central, buf->len); /* csize */
+	fz_write_buffer_int32_le(ctx, zip->central, buf->len); /* usize */
+	fz_write_buffer_int16_le(ctx, zip->central, strlen(name)); /* file name length */
+	fz_write_buffer_int16_le(ctx, zip->central, 0); /* extra field length */
+	fz_write_buffer_int16_le(ctx, zip->central, 0); /* file comment length */
+	fz_write_buffer_int16_le(ctx, zip->central, 0); /* disk number start */
+	fz_write_buffer_int16_le(ctx, zip->central, 0); /* internal file attributes */
+	fz_write_buffer_int32_le(ctx, zip->central, 0); /* external file attributes */
+	fz_write_buffer_int32_le(ctx, zip->central, offset); /* relative offset of local header */
+	fz_write_buffer(ctx, zip->central, name, strlen(name));
+
+	fz_write_int32_le(ctx, zip->output, ZIP_LOCAL_FILE_SIG);
+	fz_write_int16_le(ctx, zip->output, 20); /* version to extract: 2.0 */
+	fz_write_int16_le(ctx, zip->output, 0); /* general purpose bit flag */
+	fz_write_int16_le(ctx, zip->output, 0); /* compression method: store */
+	fz_write_int16_le(ctx, zip->output, 0); /* TODO: last mod file time */
+	fz_write_int16_le(ctx, zip->output, 0); /* TODO: last mod file date */
+	fz_write_int32_le(ctx, zip->output, sum); /* crc-32 */
+	fz_write_int32_le(ctx, zip->output, buf->len); /* csize */
+	fz_write_int32_le(ctx, zip->output, buf->len); /* usize */
+	fz_write_int16_le(ctx, zip->output, strlen(name)); /* file name length */
+	fz_write_int16_le(ctx, zip->output, 0); /* extra field length */
+	fz_write(ctx, zip->output, name, strlen(name));
+	fz_write(ctx, zip->output, buf->data, buf->len);
+
+	++zip->count;
+}
+
+void
+fz_drop_zip_writer(fz_context *ctx, fz_zip_writer *zip)
+{
+	fz_try(ctx)
+	{
+		int offset = fz_tell_output(ctx, zip->output);
+
+		fz_write(ctx, zip->output, zip->central->data, zip->central->len);
+
+		fz_write_int32_le(ctx, zip->output, ZIP_END_OF_CENTRAL_DIRECTORY_SIG);
+		fz_write_int16_le(ctx, zip->output, 0); /* number of this disk */
+		fz_write_int16_le(ctx, zip->output, 0); /* number of disk where central directory starts */
+		fz_write_int16_le(ctx, zip->output, zip->count); /* entries in central directory in this disk */
+		fz_write_int16_le(ctx, zip->output, zip->count); /* entries in central directory in total */
+		fz_write_int32_le(ctx, zip->output, zip->central->len); /* size of the central directory */
+		fz_write_int32_le(ctx, zip->output, offset); /* offset of the central directory */
+		fz_write_int16_le(ctx, zip->output, 5); /* zip file comment length */
+
+		fz_write(ctx, zip->output, "MuPDF", 5);
+	}
+	fz_always(ctx)
+	{
+		fz_drop_output(ctx, zip->output);
+		fz_drop_buffer(ctx, zip->central);
+		fz_free(ctx, zip);
+	}
+	fz_catch(ctx)
+		fz_rethrow(ctx);
+}
+
+fz_zip_writer *
+fz_new_zip_writer(fz_context *ctx, const char *filename)
+{
+	fz_zip_writer *zip = fz_malloc_struct(ctx, fz_zip_writer);
+	fz_try(ctx)
+	{
+		zip->output = fz_new_output_with_path(ctx, filename, 0);
+		zip->central = fz_new_buffer(ctx, 0);
+	}
+	fz_catch(ctx)
+	{
+		fz_drop_output(ctx, zip->output);
+		fz_drop_buffer(ctx, zip->central);
+		fz_free(ctx, zip);
+		fz_rethrow(ctx);
+	}
+	return zip;
+}