Add JPEG 2000 support.

Signed-off-by: yzrh <yzrh@noema.org>

5 files changed, 168 insertions, 6 deletions

diff --git a/README.md b/README.md
index b94a3e7..4e36fbd 100644
--- a/README.md
+++ b/README.md
@@ -9,8 +9,6 @@ Development
 Currently, CAJ, KDH, and HN can be converted. Please report
 any failures with a sample that can reproduce the behaviour.
 
-HN support does not support JPEG 2000 yet.
-
 Dependency
 ----------
 
@@ -19,6 +17,7 @@ Dependency
 3.  zlib
 4.  jbig2dec
 5.  libjpeg-turbo
+6.  openjpeg
 
 Usage
 =====
@@ -36,7 +35,7 @@ Options
 Specify output file  
 
 -b, --buffer  
-Set buffer size (default 512k)  
+Set input buffer size (default 512k)  
 
 -v, --verbose  
 Print more information (twice for even more, three times for HN image processing information as well)
diff --git a/src/Makefile b/src/Makefile
index 6943af3..065a8a5 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -4,11 +4,11 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
-src =	melon.c iconv.c zlib.c jbig.c jbig2.c jpeg.c \
+src =	melon.c iconv.c zlib.c jbig.c jbig2.c jpeg.c jp2.c \
 	cnki_caj.c cnki_hn.c cnki_kdh.c cnki_outline_tree.c \
 	cnki_pdf.c cnki_zlib.c cnki_jbig.c cnki_jbig2.c cnki.c \
 	pdf_cnki.c pdf_get.c pdf_parser.c pdf_writer.c pdf.c
-inc =	extern.h version.h iconv.h zlib.h jbig.h jbig2.h jpeg.h \
+inc =	extern.h version.h iconv.h zlib.h jbig.h jbig2.h jpeg.h jp2.h \
 	cnki.h pdf_cnki.h cnki_jbig.h pdf.h
 
 obj = ${src:.c=.o}
@@ -16,7 +16,7 @@ obj = ${src:.c=.o}
 PREFIX = /usr/local
 
 CFLAGS = -O2 -pipe -flto -Wall -Wextra
-LDFLAGS = -Wl,-O2 -lcrypto -liconv -lz -ljbig2dec -ljpeg -Wl,--as-needed
+LDFLAGS = -Wl,-O2 -lcrypto -liconv -lz -ljbig2dec -ljpeg -lopenjp2 -Wl,--as-needed
 
 CFLAGS += -I/usr/local/include
 LDFLAGS += -L/usr/local/lib
diff --git a/src/cnki_pdf.c b/src/cnki_pdf.c
index 0cb30ca..887e5f4 100644
--- a/src/cnki_pdf.c
+++ b/src/cnki_pdf.c
@@ -11,6 +11,7 @@
 #include "iconv.h"
 #include "zlib.h"
 #include "jpeg.h"
+#include "jp2.h"
 #include "pdf.h"
 #include "pdf_cnki.h"
 
@@ -660,6 +661,41 @@ cnki_pdf_hn(cnki_t **param)
 					dim[i * 2 + 1] = info[1];
 					break;
 				case JPX:
+					ret = strinfo_jp2_dim(&info[0],
+						&info[1],
+						ptr->image_data[i].image,
+						ptr->image_data[i].size);
+
+					if (ret != 0) {
+						dim[i * 2] = 0;
+						dim[i * 2 + 1] = 0;
+						break;
+					}
+
+					stream_size = ptr->image_data[i].size;
+					stream = malloc(stream_size);
+					if (stream == NULL) {
+						free(root_kid);
+						free(ids);
+						free(dim);
+						free(dictionary);
+						return 1;
+					}
+					memcpy(stream, ptr->image_data[i].image, stream_size);
+
+					snprintf(buf, 64, "/Width %d\n/Height %d\n",
+						info[0], info[1]);
+					strcat(dictionary, buf);
+
+					snprintf(buf, 64, "/Length %d\n",
+						stream_size);
+					strcat(dictionary, buf);
+
+					strcat(dictionary, "/Filter /JPXDecode\n");
+
+					dim[i * 2] = info[0];
+					dim[i * 2 + 1] = info[1];
+					break;
 				default:
 					ret = -1;
 					dim[i * 2] = -1;
diff --git a/src/jp2.c b/src/jp2.c
new file mode 100644
index 0000000..9420b48
--- /dev/null
+++ b/src/jp2.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2022, yzrh <yzrh@noema.org>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <string.h>
+
+#ifdef __linux__
+#include <openjpeg.h>
+#else
+#include <openjpeg-2.5/openjpeg.h>
+#endif
+
+typedef struct _stream_user_data {
+	OPJ_SIZE_T pos;
+	OPJ_SIZE_T size;
+	const unsigned char *data;
+} stream_user_data;
+
+static OPJ_SIZE_T
+_opj_stream_read(void *p_buffer, OPJ_SIZE_T p_nb_bytes, void *p_user_data)
+{
+	stream_user_data *d = (stream_user_data *) p_user_data;
+
+	if (d->pos >= d->size)
+		return (OPJ_SIZE_T) - 1;
+
+	OPJ_SIZE_T ret_size = p_nb_bytes;
+
+	if (d->pos + ret_size > d->size)
+		ret_size = d->size - d->pos;
+
+	memcpy(p_buffer, d->data + d->pos, ret_size);
+
+	d->pos += ret_size;
+
+	return ret_size;
+}
+
+static OPJ_OFF_T
+_opj_stream_skip(OPJ_OFF_T p_nb_bytes, void *p_user_data)
+{
+	stream_user_data *d = (stream_user_data *) p_user_data;
+
+	if (d->pos + p_nb_bytes <= d->size)
+		d->pos += p_nb_bytes;
+	else
+		d->pos = d->size;
+
+	return d->pos;
+}
+
+static OPJ_BOOL
+_opj_stream_seek(OPJ_OFF_T p_nb_bytes, void *p_user_data)
+{
+	stream_user_data *d = (stream_user_data *) p_user_data;
+
+	if (p_nb_bytes <= (OPJ_OFF_T) d->size) {
+		d->pos = p_nb_bytes;
+		return OPJ_TRUE;
+	}
+
+	return OPJ_FALSE;
+}
+
+int
+strinfo_jp2_dim(int *jp2_width, int *jp2_height,
+	const char * restrict data, int data_size)
+{
+	opj_codec_t *codec;
+	opj_dparameters_t param;
+	opj_stream_t *stream;
+	opj_image_t *image;
+	stream_user_data d;
+
+	if (data_size < 2)
+		return 1;
+
+	opj_set_default_decoder_parameters(&param);
+
+	if ((unsigned char) data[0] == 0xff && (unsigned char) data[1] == 0x4f)
+		codec = opj_create_decompress(OPJ_CODEC_J2K);
+	else
+		codec = opj_create_decompress(OPJ_CODEC_JP2);
+
+	if (!opj_setup_decoder(codec, &param)) {
+		opj_destroy_codec(codec);
+		return 1;
+	}
+
+	stream = opj_stream_default_create(OPJ_TRUE);
+
+	d.pos = 0;
+	d.size = data_size;
+	d.data = (unsigned char *) data;
+
+	opj_stream_set_read_function(stream, _opj_stream_read);
+	opj_stream_set_skip_function(stream, _opj_stream_skip);
+	opj_stream_set_seek_function(stream, _opj_stream_seek);
+	opj_stream_set_user_data(stream, &d, NULL);
+	opj_stream_set_user_data_length(stream, data_size);
+
+	if (!opj_read_header(stream, codec, &image)) {
+		opj_destroy_codec(codec);
+		opj_stream_destroy(stream);
+		return 1;
+	}
+
+	opj_destroy_codec(codec);
+	opj_stream_destroy(stream);
+
+	*jp2_width = image->x1 - image->x0;
+	*jp2_height = image->y1 - image->y0;
+
+	opj_image_destroy(image);
+
+	return 0;
+}
diff --git a/src/jp2.h b/src/jp2.h
new file mode 100644
index 0000000..5644938
--- /dev/null
+++ b/src/jp2.h
@@ -0,0 +1,8 @@
+/*
+ * Copyright (c) 2022, yzrh <yzrh@noema.org>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+int strinfo_jp2_dim(int *jp2_width, int *jp2_height,
+	const char * restrict data, int data_size);