Fix HN text parsing.

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

CHANGE.md

@@ -1,8 +1,30 @@
 0.3.0 (2023-XX-XX)
 ==================
 
-* Support HN figure placement.
 * Support HN text overlay.
+* Support HN page with text.
+* Handle inaccurate page count in CAJ and KDH.
+
+0.2.5 (2023-01-05)
+==================
+
+* Improve PDF parser.
+* Handle duplicated object in CAJ.
+* Handle duplicated image in HN.
+* Handle incomplete PDF object in CAJ and KDH.
+* Handle invalid PDF object token in CAJ and KDH.
+* Fix JBIG decoder.
+
+0.2.4 (2022-12-31)
+==================
+
+* Fix HN image compositing.
+* Fix PDF object check.
+
+0.2.3 (2022-12-30)
+==================
+
+* Support HN figure placement.
 
 0.2.2 (2022-12-29)
 ==================

README.md

@@ -12,12 +12,12 @@ any failures with a sample that can reproduce the behaviour.
 Dependency
 ----------
 
-1.  OpenSSL
-2.  libiconv
-3.  zlib
-4.  jbig2dec
-5.  libjpeg-turbo
-6.  openjpeg
+1.  libcrypto (OpenSSL)
+2.  zlib
+3.  jbig2dec
+4.  libjpeg-turbo
+5.  openjpeg
+6.  pkgconf
 
 Usage
 =====

src/Makefile

@@ -4,23 +4,28 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
-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 \
+src =	melon.c iconv.c zlib.c jbig2.c jpeg.c jp2.c md5.c \
+	cnki_caj.c cnki_hn.c cnki_kdh.c cnki_outline_tree.c cnki_pdf.c \
+	cnki_zlib.c cnki_jbig.c cnki_jbig_dec.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 jp2.h \
-	cnki.h pdf_cnki.h cnki_jbig.h pdf.h
+inc =	extern.h version.h iconv.h zlib.h jbig2.h jpeg.h jp2.h md5.h \
+	cnki.h pdf_cnki.h cnki_jbig.h cnki_jbig_dec.h pdf.h
 
 obj = ${src:.c=.o}
 
 PREFIX = /usr/local
 
 CFLAGS = -O2 -pipe -flto -Wall -Wextra
-LDFLAGS = -Wl,-O2 -lcrypto -liconv -lz -ljbig2dec -ljpeg -lopenjp2 -Wl,--as-needed
+LDFLAGS = -Wl,-O2 -lcrypto -lz -ljbig2dec -ljpeg -lopenjp2 -Wl,--as-needed
 
 CFLAGS += -I/usr/local/include
 LDFLAGS += -L/usr/local/lib
 
+OPENJPEG_CFLAGS != pkgconf --cflags libopenjp2
+
+CFLAGS += ${OPENJPEG_CFLAGS}
+CFLAGS += -DLIBICONV_PLUG
+
 all: ${obj} ${inc}
 	${CC} ${LDFLAGS} -o melon ${obj}
 

src/cnki.h

@@ -58,10 +58,10 @@ typedef struct _hn_image_t {
 	int32_t format; /* hn_code */
 	int32_t address;
 	int32_t size;
-	int16_t x;
-	int16_t y;
-	int16_t w;
-	int16_t h;
+	uint16_t x;
+	uint16_t y;
+	uint16_t w;
+	uint16_t h;
 	char *image;
 } hn_image_t;
 

src/cnki_jbig.c

@@ -8,7 +8,7 @@
 #include <string.h>
 
 #include "cnki_jbig.h"
-#include "jbig.h"
+#include "cnki_jbig_dec.h"
 
 int
 cnki_jbig(char **bitmap, int *bitmap_size,

src/cnki_jbig.h

@@ -27,8 +27,8 @@ typedef struct _dib_t {
 	uint16_t depth;
 	uint32_t compression; /* dib_compression_code */
 	uint32_t size;
-	uint32_t resolution_h;
-	uint32_t resolution_v;
+	int32_t resolution_h;
+	int32_t resolution_v;
 	uint32_t colour;
 	uint32_t colour_used;
 } dib_t;

src/cnki_jbig_dec.c

@@ -9,7 +9,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-static const uint16_t _LSZ[256] = {
+static const uint16_t _LSZ[0x71] = {
 	0x5a1d,
 	0x2586, 0x1114, 0x080b, 0x03d8, 0x01da, 0x00e5, 0x006f, 0x0036,
 	0x001a, 0x000d, 0x0006, 0x0003, 0x0001, 0x5a7f, 0x3f25, 0x2cf2,
@@ -28,7 +28,7 @@ static const uint16_t _LSZ[256] = {
 	0x5627, 0x50e7, 0x4b85, 0x5597, 0x504f, 0x5a10, 0x5522, 0x59eb
 };
 
-static const uint8_t _NLPS[256] = {
+static const uint8_t _NLPS[0x71] = {
 	1,
 	14, 16, 18, 20, 23, 25, 28, 30,
 	33, 35, 9, 10, 12, 15, 36, 38,
@@ -47,7 +47,7 @@ static const uint8_t _NLPS[256] = {
 	105, 108, 109, 110, 111, 110, 112, 112
 };
 
-static const uint8_t _NMPS[256] = {
+static const uint8_t _NMPS[0x71] = {
 	1,
 	2, 3, 4, 5, 6, 7, 8, 9,
 	10, 11, 12, 13, 13, 15, 16, 17,
@@ -66,7 +66,7 @@ static const uint8_t _NMPS[256] = {
 	106, 107, 103, 109, 107, 111, 109, 111
 };
 
-static const bool _SWTCH[256] = {
+static const bool _SWTCH[0x71] = {
 	1,
 	0, 0, 0, 0, 0, 0, 0, 0,
 	0, 0, 0, 0, 0, 1, 0, 0,
@@ -99,7 +99,7 @@ static int _height;
 static int _width_padded;
 
 static int _ret_pos;
-static char *_ret;
+static unsigned char *_ret;
 
 static int _scd_size;
 static unsigned char *_scd;
@@ -108,7 +108,7 @@ static void
 _bytein(void)
 {
 	if (_ret_pos < _scd_size)
-		_reg_c += *(_scd + _ret_pos++) << 8;
+		_reg_c += _scd[_ret_pos++] << 8;
 
 	_ct = 8;
 }
@@ -209,25 +209,36 @@ _procline(int line, char *a, char *b, char *c)
 	/* The encoder must be erroneous */
 	uint16_t cx = 0;
 
+	if (line > 0) {
+		cx += (_ret[_width_padded * (_height - line)] & 0x20) << 2;
+		cx += _ret[_width_padded * (_height - line)] & 0x40;
+		cx += (_ret[_width_padded * (_height - line)] & 0x80) >> 2;
+	}
+
+	if (line > 1) {
+		cx += (_ret[_width_padded * (_height - line + 1)] & 0x40) >> 4;
+		cx += (_ret[_width_padded * (_height - line + 1)] & 0x80) >> 6;
+	}
+
 	for (int i = 0; i < _width; i++) {
 		_decode(cx);
 
 		cx >>= 1;
 
 		if (_pix == 1) {
-			*(_ret + _width_padded * (_height - line - 1) + i / 8) |= _pix << (7 - (i & 0x07));
-			*(c + i) = 1;
+			_ret[_width_padded * (_height - line - 1) + i / 8] |= _pix << (7 - (i & 0x07));
+			c[i] = 1;
 			cx |= 0x0200;
 		} else {
 			cx &= 0xfdff;
 		}
 
-		if (i + 2 < _width && *(a + i + 2) == 1)
+		if (i + 2 < _width && a[i + 2] == 1)
 			cx |= 0x0004;
 		else
 			cx &= 0xfffb;
 
-		if (i + 3 < _width && *(b + i + 3) == 1)
+		if (i + 3 < _width && b[i + 3] == 1)
 			cx |= 0x0080;
 		else
 			cx &= 0xff7f;
@@ -293,7 +304,7 @@ strdec_jbig(char **bitmap, int width, int height,
 	memset(*bitmap, 0, _height * _width_padded);
 
 	_ret_pos = 0;
-	_ret = *bitmap;
+	_ret = (unsigned char *) *bitmap;
 
 	_scd_size = jbig_size;
 	_scd = (unsigned char *) jbig;

src/cnki_kdh.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020-2021, yzrh <yzrh@noema.org>
+ * Copyright (c) 2020-2023, yzrh <yzrh@noema.org>
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -15,16 +15,18 @@ cnki_kdh(cnki_t **param)
 	if ((*param)->stat > 0)
 		printf("Begin 'KDH' decryption\n");
 
+	long cur = ADDRESS_KDH_BODY;
+	long end;
+
 	fseek((*param)->fp_i, 0, SEEK_END);
-
-	long size = ftell((*param)->fp_i);
-
-	fseek((*param)->fp_i, ADDRESS_KDH_BODY, SEEK_SET);
+	end = ftell((*param)->fp_i);
+	fseek((*param)->fp_i, cur, SEEK_SET);
 
 	const char key[] = KEY_KDH;
 	const int key_len = KEY_KDH_LENGTH;
 	long key_cur = 0;
 
+	int buf_size;
 	char buf[(*param)->size_buf];
 
 	FILE *tmp = tmpfile();
@@ -33,32 +35,32 @@ cnki_kdh(cnki_t **param)
 		return 1;
 
 	for (;;) {
-		fread(buf, (*param)->size_buf, 1, (*param)->fp_i);
+		if (cur + (*param)->size_buf < end)
+			buf_size = (*param)->size_buf;
+		else
+			buf_size = end - cur;
 
-		for (int i = 0; i < (*param)->size_buf; i++) {
-			buf[i] ^= key[key_cur % key_len];
-			key_cur++;
-		}
+		fread(buf, buf_size, 1, (*param)->fp_i);
 
-		fwrite(buf, (*param)->size_buf, 1, tmp);
+		for (int i = 0; i < buf_size; i++)
+			buf[i] ^= key[key_cur++ % key_len];
 
-		if (ftell((*param)->fp_i) == size)
+		fwrite(buf, buf_size, 1, tmp);
+
+		if ((cur = ftell((*param)->fp_i)) >= end)
 			break;
 	}
 
 	if ((*param)->stat > 0)
 		printf("Decrypted %ld byte(s)\n", ftell(tmp));
 
-	fseek(tmp, 0, SEEK_SET);
+	fclose((*param)->fp_i);
 
-	FILE *orig = (*param)->fp_i;
+	fseek(tmp, 0, SEEK_SET);
 	(*param)->fp_i = tmp;
 
 	cnki_pdf(param);
 
-	(*param)->fp_i = orig;
-	fclose(tmp);
-
 	if ((*param)->stat > 0)
 		printf("Conversion ended\n");
 

src/cnki_pdf.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020-2022, yzrh <yzrh@noema.org>
+ * Copyright (c) 2020-2023, yzrh <yzrh@noema.org>
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -145,11 +145,54 @@ _pdf_obj_sort(cnki_t **param, pdf_object_t **pdf)
 
 	ret = pdf_obj_sort(pdf);
 
+	if ((*param)->stat > 0)
+		printf("Sorted object(s)\n");
+
+	return ret;
+}
+
+static int
+_pdf_obj_dedup(cnki_t **param, pdf_object_t **pdf)
+{
+	int ret = 0;
+
+	pdf_object_t *tmp;
+	pdf_object_t *ptr;
+
+	if ((*param)->stat > 1)
+		printf("Deleting duplicated object\n");
+
+	ptr = *pdf;
+	while (ptr->next != NULL && ptr->next->next != NULL) {
+		if (ptr->next->id == ptr->next->next->id) {
+			/* Keep the bigger one, the smaller one is usually incomplete */
+			if (ptr->next->size < ptr->next->next->size) {
+				pdf_get_obj(&ptr, ptr->next->id, &tmp);
+				pdf_obj_del(&ptr, ptr->next->id);
+			} else {
+				pdf_get_obj(&ptr->next, ptr->next->id, &tmp);
+				pdf_obj_del(&ptr->next, ptr->next->id);
+			}
+
+			tmp->next = NULL;
+			pdf_obj_destroy(&tmp);
+
+			ret++;
+
+			if ((*param)->stat > 1)
+				printf("Deleted duplicated object %d.\n", ptr->next->id);
+
+			continue;
+		}
+
+		ptr = ptr->next;
+	}
+
 	if ((*param)->stat > 0) {
 		if (ret == 0)
-			printf("Sorted object(s)\n");
+			printf("No duplicated object\n");
 		else
-			printf("Object(s) not sorted\n");
+			printf("Deleted %d duplicated object(s)\n", ret);
 	}
 
 	return ret;
@@ -212,19 +255,23 @@ cnki_pdf(cnki_t **param)
 	int *parent = NULL;
 	pdf_get_parent_id(&pdf, &parent);
 
-	if (parent[0] == 0)
-		return 1;
-
 	if ((*param)->stat > 0)
 		printf("Discovered %d parent object(s)\n", parent[0]);
 
-	int *parent_missing = malloc(parent[0] * sizeof(int));
+	pdf_obj_sort(&pdf);
 
-	if (parent_missing == NULL)
-		return 1;
+	_pdf_obj_dedup(param, &pdf);
 
+	int8_t *parent_missing;
 	int *kid;
 
+	if (parent[0] > 0) {
+		parent_missing = malloc(parent[0] * sizeof(int8_t));
+
+		if (parent_missing == NULL)
+			return 1;
+	}
+
 	for (int i = 1; i <= parent[0]; i++) {
 		if ((*param)->stat > 1)
 			printf("Searching for object %d\n", parent[i]);
@@ -266,7 +313,7 @@ cnki_pdf(cnki_t **param)
 
 			snprintf(buf, 64,
 				"]\n/Count %d\n>>",
-				pdf_get_kid_count(&pdf, parent[i]));
+				pdf_get_kid_count(&pdf, parent[i]) > 0 ? pdf_get_kid_count(&pdf, parent[i]) : kid[0]);
 			strcat(dictionary, buf);
 
 			pdf_obj_prepend(&pdf, parent[i], NULL, dictionary, NULL, 0);
@@ -291,7 +338,7 @@ cnki_pdf(cnki_t **param)
 	if ((*param)->stat > 1)
 		printf("Searching for root object\n");
 
-	dictionary_size = 128;
+	dictionary_size = 128 + 12 * parent[0];
 	dictionary = malloc(dictionary_size);
 
 	if (dictionary == NULL) {
@@ -319,7 +366,7 @@ cnki_pdf(cnki_t **param)
 		} else {
 			for (int i = 0; i < parent[0]; i++)
 				if (parent_missing[i] == 1)
-					root = i;
+					root = parent[i + 1];
 		}
 
 		if (root == 0)
@@ -328,7 +375,11 @@ cnki_pdf(cnki_t **param)
 			printf("Root object is %d.\n", root);
 	}
 
-	if (pdf_get_obj(&pdf, root, NULL) != 0) {
+	int root_gen;
+
+	pdf_object_t *tmp;
+
+	if ((root_gen = pdf_get_obj(&pdf, root, &tmp)) != 0) {
 		if ((*param)->stat > 0)
 			printf("Root object is missing\n");
 
@@ -336,14 +387,11 @@ cnki_pdf(cnki_t **param)
 			printf("Generating root object\n");
 
 		snprintf(buf, 64,
-			"<<\n/Type /Pages\n/Kids ");
+			"<<\n/Type /Pages\n/Kids [");
 		strcat(dictionary, buf);
 
-		if (parent[0] > 1)
-			strcat(dictionary, "[");
-
 		for (int i = 0, j = 0; i < parent[0]; i++) {
-			if (parent_missing[i]) {
+			if (parent_missing[i] == 1) {
 				snprintf(buf, 64, "%d 0 R", parent[i + 1]);
 				strcat(dictionary, buf);
 
@@ -352,12 +400,7 @@ cnki_pdf(cnki_t **param)
 			}
 		}
 
-		if (parent[0] > 1)
-			strcat(dictionary, "]");
-
-		strcat(dictionary, "\n");
-
-		snprintf(buf, 64, "/Count %d\n", (*param)->file_stat->page);
+		snprintf(buf, 64, "]\n/Count %d\n", (*param)->file_stat->page);
 		strcat(dictionary, buf);
 
 		strcat(dictionary, ">>");
@@ -371,11 +414,27 @@ cnki_pdf(cnki_t **param)
 				root);
 	}
 
+	if (parent[0] > 0)
+		free(parent_missing);
+
 	free(parent);
-	free(parent_missing);
 
 	int outline = _pdf_cnki_outline(param, &pdf);
 
+	snprintf(buf, 64,
+		"<<\n/Type /Catalog\n/Pages %d 0 R\n",
+		root);
+	strcat(dictionary, buf);
+
+	if (outline != -1) {
+		snprintf(buf, 64,
+			"/Outlines %d 0 R\n/PageMode /UseOutlines\n",
+			outline);
+		strcat(dictionary, buf);
+	}
+
+	strcat(dictionary, ">>");
+
 	if ((*param)->stat > 1)
 		printf("Searching for catalog object\n");
 
@@ -384,6 +443,16 @@ cnki_pdf(cnki_t **param)
 	if (catalog != 0) {
 		if ((*param)->stat > 0)
 			printf("Catalog object is %d.\n", catalog);
+
+		if (root_gen != 0) {
+			if ((*param)->stat > 1)
+				printf("Replacing catalog object\n");
+
+			pdf_obj_replace(&pdf, catalog, NULL, dictionary, NULL, 0);
+
+			if ((*param)->stat > 0)
+				printf("Replaced catalog object\n");
+		}
 	} else {
 		if ((*param)->stat > 0)
 			printf("Catalog object is missing\n");
@@ -391,20 +460,6 @@ cnki_pdf(cnki_t **param)
 		if ((*param)->stat > 1)
 			printf("Generating catalog object\n");
 
-		snprintf(buf, 64,
-			"<<\n/Type /Catalog\n/Pages %d 0 R\n",
-			root);
-		strcat(dictionary, buf);
-
-		if (outline != -1) {
-			snprintf(buf, 64,
-				"/Outlines %d 0 R\n/PageMode /UseOutlines\n",
-				outline);
-			strcat(dictionary, buf);
-		}
-
-		strcat(dictionary, ">>");
-
 		pdf_obj_append(&pdf, 0, NULL, dictionary, NULL, 0);
 
 		if ((*param)->stat > 0)
@@ -423,8 +478,6 @@ cnki_pdf(cnki_t **param)
 		if ((*param)->stat > 1)
 			printf("Deleting xref object\n");
 
-		pdf_object_t *tmp;
-
 		pdf_get_obj(&pdf, xref, &tmp);
 		pdf_obj_del(&pdf, xref);
 
@@ -460,6 +513,9 @@ cnki_pdf_hn(cnki_t **param)
 	if (pdf_obj_create(&pdf) != 0)
 		return 1;
 
+	int font = pdf_get_free_id(&pdf);
+	pdf_obj_append(&pdf, font, NULL, "<<\n/Type /Font\n/Subtype /TrueType\n/BaseFont /NotoSansCJKSC\n>>", NULL, 0);
+
 	if ((*param)->stat > 1)
 		printf("Generating PDF object(s)\n");
 
@@ -468,27 +524,26 @@ cnki_pdf_hn(cnki_t **param)
 
 	char buf[64];
 
+	pdf_object_t *tmp;
+
 	int cnt = 0;
 	int *root_kid = malloc((*param)->file_stat->page * sizeof(int));
 
 	if (root_kid == NULL)
 		return 1;
 
-	memset(root_kid, 0, (*param)->file_stat->page);
+	memset(root_kid, 0, (*param)->file_stat->page * sizeof(int));
 
 	object_hn_t *ptr = (*param)->object_hn;
 	while (ptr != NULL) {
 		/*
 		 * External object (ptr->image_length) +
-		 * content object +
 		 * resource object +
+		 * content object +
 		 * page object
 		 */
 		int *ids = NULL;
-		if (ptr->image_length > 0)
-			pdf_get_free_ids(&pdf, &ids, ptr->image_length + 3);
-		else
-			pdf_get_free_ids(&pdf, &ids, 2);
+		pdf_get_free_ids(&pdf, &ids, ptr->image_length + 3);
 
 		int bitmap_size;
 		char *bitmap;
@@ -496,10 +551,10 @@ cnki_pdf_hn(cnki_t **param)
 		int stream_size;
 		char *stream;
 
-		int *dim;
+		double *dim;
 
 		if (ptr->image_length > 0) {
-			dim = malloc(2 * ptr->image_length * sizeof(int));
+			dim = malloc(2 * ptr->image_length * sizeof(double));
 
 			if (dim == NULL) {
 				free(root_kid);
@@ -730,10 +785,30 @@ cnki_pdf_hn(cnki_t **param)
 			}
 		}
 
-		if (ptr->image_length > 0) {
-			memset(dictionary, 0, dictionary_size);
+		if (ptr->image_length > 0)
+			free(dictionary);
 
-			strcat(dictionary, "<<\n/XObject <<");
+		dictionary_size = 128 + 2 * ptr->text_size + 128 * ptr->image_length;
+		dictionary = malloc(dictionary_size);
+
+		if (dictionary == NULL) {
+			free(root_kid);
+			free(ids);
+			free(dim);
+			return 1;
+		}
+
+		memset(dictionary, 0, dictionary_size);
+
+		strcat(dictionary, "<<\n");
+
+		if (ptr->text_size > 0) {
+			snprintf(buf, 64, "/Font <</F0 %d 0 R>>\n", font);
+			strcat(dictionary, buf);
+		}
+
+		if (ptr->image_length > 0) {
+			strcat(dictionary, "/XObject <<");
 
 			for (int i = 0; i < ptr->image_length; i++) {
 				snprintf(buf, 64, "/Im%d %d 0 R", i, ids[i]);
@@ -743,13 +818,15 @@ cnki_pdf_hn(cnki_t **param)
 					strcat(dictionary, " ");
 			}
 
-			strcat(dictionary, ">>\n>>");
-
-			pdf_obj_append(&pdf, ids[ptr->image_length], NULL, dictionary, NULL, 0);
-
-			free(dictionary);
+			strcat(dictionary, ">>\n");
 		}
 
+		strcat(dictionary, ">>");
+
+		pdf_obj_append(&pdf, ids[ptr->image_length], NULL, dictionary, NULL, 0);
+
+		memset(dictionary, 0, dictionary_size);
+
 		int conv_size;
 		char *conv_dst;
 		char conv_src[2];
@@ -766,104 +843,104 @@ cnki_pdf_hn(cnki_t **param)
 				ptr->text = stream;
 			}
 
-			dictionary_size = 64 + 2 * ptr->text_size;
-			dictionary = malloc(dictionary_size);
-
-			if (dictionary == NULL) {
-				free(root_kid);
-				free(ids);
-				free(dim);
-				return 1;
-			}
-
-			memset(dictionary, 0, dictionary_size);
-
 			strcat(dictionary, "BT\n");
 
+			strcat(dictionary, "/F0 10 Tf\n");
+
 			for (int i = 0, j = 0; i < ptr->text_size - 1;) {
-				switch ((uint16_t) (ptr->text[i + 1] << 8 | ptr->text[i])) {
+				switch (((unsigned char) ptr->text[i + 1] << 8) + (unsigned char) ptr->text[i]) {
 					case 0x8001:
 						if (ptr->address_next <= ptr->address) {
-							i += 2;
+							if (i + 7 >= ptr->text_size) {
+								i += 2;
+								break;
+							}
+
+							conv_src[0] = ptr->text[i + 7];
+							conv_src[1] = ptr->text[i + 6];
+
+							//snprintf(buf, 64, "1 0 0 1 %d %d Tm\n")
+							//strcat(dictionary, buf);
+
+							conv_size = 6;
+
+							if (strconv(&conv_dst, "UTF-16BE",
+								conv_src, "GB18030", &conv_size) == 0) {
+								if (conv_size - 2 > 0) {
+									strcat(dictionary, "<");
+									for (int k = 0; k < conv_size - 2; k++) {
+										snprintf(conv_hex, 3,
+											"%02x", (unsigned char) conv_dst[k]);
+										strcat(dictionary, conv_hex);
+									}
+									strcat(dictionary, "> Tj\n");
+								}
+								free(conv_dst);
+							}
+
+							i += 8;
 							break;
 						}
 
 						strcat(dictionary, "T*\n");
 					case 0x8070:
-						if (ptr->address_next > ptr->address) {
-							i += 4;
+						i += 4;
 
-							for (;;) {
-								if (i + 3 >= ptr->text_size ||
-									(unsigned char) ptr->text[i + 1] == 0x80)
-									break;
+						if (ptr->address_next <= ptr->address)
+							break;
 
-								conv_src[0] = ptr->text[i + 3];
-								conv_src[1] = ptr->text[i + 2];
+						for (;;) {
+							if (i + 3 >= ptr->text_size ||
+								(unsigned char) ptr->text[i + 1] == 0x80)
+								break;
 
-								conv_size = 6;
+							conv_src[0] = ptr->text[i + 3];
+							conv_src[1] = ptr->text[i + 2];
 
-								if (strconv(&conv_dst, "UTF-16BE",
-									conv_src, "GB18030", &conv_size) == 0) {
-									if (conv_size - 2 > 0) {
-										strcat(dictionary, "<feff");
-										for (int k = 0; k < conv_size - 2; k++) {
-											snprintf(conv_hex, 3,
-												"%02x", (unsigned char) conv_dst[k]);
-											strcat(dictionary, conv_hex);
-										}
-										strcat(dictionary, "> Tj\n");
+							//snprintf(buf, 64, "1 0 0 1 %d %d Tm\n")
+							//strcat(dictionary, buf);
+
+							conv_size = 6;
+
+							if (strconv(&conv_dst, "UTF-16BE",
+								conv_src, "GB18030", &conv_size) == 0) {
+								if (conv_size - 2 > 0) {
+									strcat(dictionary, "<");
+									for (int k = 0; k < conv_size - 2; k++) {
+										snprintf(conv_hex, 3,
+											"%02x", (unsigned char) conv_dst[k]);
+										strcat(dictionary, conv_hex);
 									}
-									free(conv_dst);
+									strcat(dictionary, "> Tj\n");
 								}
-
-								i += 4;
+								free(conv_dst);
 							}
 
-							break;
+							i += 4;
 						}
 
-						if (i + 7 >= ptr->text_size) {
-							i += 2;
-							break;
-						}
-
-						conv_src[0] = ptr->text[i + 7];
-						conv_src[1] = ptr->text[i + 6];
-
-						conv_size = 6;
-
-						if (strconv(&conv_dst, "UTF-16BE",
-							conv_src, "GB18030", &conv_size) == 0) {
-							if (conv_size - 2 > 0) {
-								strcat(dictionary, "<feff");
-								for (int k = 0; k < conv_size - 2; k++) {
-									snprintf(conv_hex, 3,
-										"%02x", (unsigned char) conv_dst[k]);
-									strcat(dictionary, conv_hex);
-								}
-								strcat(dictionary, "> Tj\n");
-							}
-							free(conv_dst);
-						}
-
-						i += 8;
 						break;
 					case 0x800a:
 						if (i + 27 >= ptr->text_size || j >= ptr->image_length) {
 							i += 2;
+
+							if (j >= ptr->image_length)
+								i += 26;
 							break;
 						}
 
 						if (ptr->image_length > 0) {
-							ptr->image_data[j].x =
-								ptr->text[i + 5] << 8 | ptr->text[i + 4];
-							ptr->image_data[j].y =
-								ptr->text[i + 7] << 8 | ptr->text[i + 6];
-							ptr->image_data[j].w =
-								ptr->text[i + 9] << 8 | ptr->text[i + 8];
-							ptr->image_data[j].h =
-								ptr->text[i + 11] << 8 | ptr->text[i + 10];
+							ptr->image_data[j].x += (unsigned char) ptr->text[i + 5] << 8;
+							ptr->image_data[j].x += (unsigned char) ptr->text[i + 4];
+
+							ptr->image_data[j].y += (unsigned char) ptr->text[i + 7] << 8;
+							ptr->image_data[j].y += (unsigned char) ptr->text[i + 6];
+
+							ptr->image_data[j].w += (unsigned char) ptr->text[i + 9] << 8;
+							ptr->image_data[j].w += (unsigned char) ptr->text[i + 8];
+
+							ptr->image_data[j].h += (unsigned char) ptr->text[i + 11] << 8;
+							ptr->image_data[j].h += (unsigned char) ptr->text[i + 10];
 
 							if ((*param)->stat > 2)
 								printf("\tItem %d: origin (%4d, %4d), width %4d, height %4d\n",
@@ -875,7 +952,9 @@ cnki_pdf_hn(cnki_t **param)
 						}
 
 						i += 28;
-						j++;
+
+						if (j == 0 || ptr->image_data[j].x > 0 || ptr->image_data[j].y > 0)
+							j++;
 						break;
 					default:
 						i += 4;
@@ -885,39 +964,61 @@ cnki_pdf_hn(cnki_t **param)
 
 			strcat(dictionary, "ET");
 
-			/* FIXME: Use the text somehow? */
-			free(dictionary);
+			if (ptr->image_length > 0)
+				strcat(dictionary, "\n");
 		}
 
-		dictionary_size = 128 + 128 * ptr->image_length;
-		dictionary = malloc(dictionary_size);
-
-		if (dictionary == NULL) {
-			free(root_kid);
-			free(ids);
-			free(dim);
-			return 1;
-		}
+		/* FIXME: Use the text somehow? */
+		memset(dictionary, 0, dictionary_size);
 
 		if (ptr->image_length > 0) {
-			memset(dictionary, 0, dictionary_size);
-
-			char resize_str[64] = "0.25 0 0 0.25 0 0 cm\n";
 			double resize_x = 1;
 			double resize_y = 1;
 
-			if (dim[0] > 0 && dim[1] > 0) {
-				/* Scale within bound of A4 paper */
-				resize_x = 4 * 595.2756 / dim[0];
-				resize_y = 4 * 841.8898 / dim[1];
+			double margin_x = 0;
+			double margin_y = 0;
 
-				if (resize_y < resize_x)
-					snprintf(buf, 64, "%f 0 0 %f 0 0 cm\n",
-						resize_y, resize_y);
-				else
-					snprintf(buf, 64, "%f 0 0 %f 0 0 cm\n",
-						resize_x, resize_x);
-				strcat(resize_str, buf);
+			if (ptr->image_data[0].x == 0 && ptr->image_data[0].y == 0 && dim[0] > 0 && dim[1] > 0) {
+				/* Scale within bound of A4 paper */
+				resize_x = 2480.315 / dim[0];
+				resize_y = 3507.874 / dim[1];
+
+				if (resize_y < resize_x) {
+					for (int i = 0; i < ptr->image_length; i++) {
+						dim[i * 2] *= resize_y;
+						dim[i * 2 + 1] *= resize_y;
+					}
+				} else {
+					for (int i = 0; i < ptr->image_length; i++) {
+						dim[i * 2] *= resize_x;
+						dim[i * 2 + 1] *= resize_x;
+					}
+				}
+
+				margin_x = (2480.315 - dim[0]) / 2;
+				margin_y = (3507.874 - dim[1]) / 2;
+			}
+
+			/* Remove duplicated image, ptr->image_length is sometimes squared */
+			for (int i = 1; i < ptr->image_length; i++) {
+				if ((ptr->image_data[i].x > 0 || ptr->image_data[i].y > 0) &&
+					dim[i * 2] < dim[0] && dim[i * 2 + 1] < dim[1])
+					continue;
+
+				for (int j = i; j < ptr->image_length; j++) {
+					pdf_get_obj(&pdf, ids[j], &tmp);
+					pdf_obj_del(&pdf, ids[j]);
+
+					tmp->next = NULL;
+					pdf_obj_destroy(&tmp);
+
+					dim[j * 2] = -1;
+					dim[j * 2 + 1] = -1;
+
+					pdf_obj_append(&pdf, ids[j], NULL, NULL, NULL, 0);
+				}
+
+				break;
 			}
 
 			for (int i = 0; i < ptr->image_length; i++) {
@@ -926,39 +1027,47 @@ cnki_pdf_hn(cnki_t **param)
 
 				strcat(dictionary, "q\n");
 
-				strcat(dictionary, resize_str);
+				strcat(dictionary, "0.24 0 0 0.24 0 0 cm\n");
 
 				/* Rotate image */
 				if (ptr->image_data[i].format == JBIG || ptr->image_data[i].format == DCT_1) {
-					snprintf(buf, 64, "1 0 0 1 0 %d cm\n",
-						dim[i * 2 + 1]);
+					snprintf(buf, 64, "1 0 0 -1 0 %f cm\n", dim[i * 2 + 1]);
 					strcat(dictionary, buf);
-
-					strcat(dictionary, "1 0 0 -1 0 0 cm\n");
 				}
 
 				/* Translate figure */
-				if (i > 0) {
-					double origin_x = 0.4043745 * ptr->image_data[i].x;
-					double origin_y = 0.4043561 * ptr->image_data[i].y;
+				if (ptr->image_data[i].x > 0 || ptr->image_data[i].y > 0) {
+					double origin_x = ptr->image_data[i].x * 0.40433;
+					double origin_y = ptr->image_data[i].y * 0.40433;
 
-					if (origin_x < 0)
-						origin_x += (2381.102 - dim[i * 2]) / 2;
-
-					if (origin_y < 0)
-						origin_y += (3367.559 + dim[i * 2 + 1]) / 2;
+					if (resize_y < resize_x) {
+						origin_x *= resize_y;
+						origin_y *= resize_y;
+					} else {
+						origin_x *= resize_x;
+						origin_y *= resize_x;
+					}
 
 					if (ptr->image_data[i].format == JBIG || ptr->image_data[i].format == DCT_1)
-						origin_y = -3367.559 + origin_y + dim[i * 2 + 1];
+						origin_y = -3507.874 + origin_y + dim[i * 2 + 1];
 					else
-						origin_y = 3367.559 - origin_y - dim[i * 2 + 1];
+						origin_y = 3507.874 - origin_y - dim[i * 2 + 1];
 
 					snprintf(buf, 64, "1 0 0 1 %f %f cm\n", origin_x, origin_y);
 					strcat(dictionary, buf);
 				}
 
-				snprintf(buf, 64, "%d 0 0 %d 0 0 cm\n",
-					dim[i * 2], dim[i * 2 + 1]);
+				if (margin_x > 0 || margin_y > 0) {
+					if (ptr->image_data[i].format == JBIG || ptr->image_data[i].format == DCT_1) {
+						snprintf(buf, 64, "1 0 0 1 %f %f cm\n", margin_x, -margin_y);
+						strcat(dictionary, buf);
+					} else {
+						snprintf(buf, 64, "1 0 0 1 %f %f cm\n", margin_x, margin_y);
+						strcat(dictionary, buf);
+					}
+				}
+
+				snprintf(buf, 64, "%f 0 0 %f 0 0 cm\n", dim[i * 2], dim[i * 2 + 1]);
 				strcat(dictionary, buf);
 
 				snprintf(buf, 64, "/Im%d Do\n", i);
@@ -970,10 +1079,13 @@ cnki_pdf_hn(cnki_t **param)
 					strcat(dictionary, "\n");
 			}
 
+			free(dim);
+		}
+
+		if (strlen(dictionary) > 0) {
 			if (strdeflate(&stream, &stream_size, dictionary, strlen(dictionary)) != 0) {
 				free(root_kid);
 				free(ids);
-				free(dim);
 				free(dictionary);
 				return 1;
 			}
@@ -993,6 +1105,9 @@ cnki_pdf_hn(cnki_t **param)
 				NULL, dictionary, stream, stream_size);
 
 			free(stream);
+		} else {
+			pdf_obj_append(&pdf, ids[ptr->image_length + 1],
+				NULL, NULL, NULL, 0);
 		}
 
 		memset(dictionary, 0, dictionary_size);
@@ -1002,32 +1117,19 @@ cnki_pdf_hn(cnki_t **param)
 		/* A4 paper */
 		strcat(dictionary, "/MediaBox [0 0 595.2756 841.8898]\n");
 
-		if (ptr->image_length > 0) {
-			free(dim);
+		snprintf(buf, 64, "/Resources %d 0 R\n", ids[ptr->image_length]);
+		strcat(dictionary, buf);
 
-			snprintf(buf, 64, "/Resources %d 0 R\n", ids[ptr->image_length]);
-			strcat(dictionary, buf);
+		snprintf(buf, 64, "/Contents %d 0 R\n", ids[ptr->image_length + 1]);
+		strcat(dictionary, buf);
 
-			snprintf(buf, 64, "/Contents %d 0 R\n", ids[ptr->image_length + 1]);
-			strcat(dictionary, buf);
+		/* Add /Parent when we know root */
+		pdf_obj_append(&pdf, ids[ptr->image_length + 2], NULL, dictionary, NULL, 0);
 
-			/* Add /Parent when we know root */
-			pdf_obj_append(&pdf, ids[ptr->image_length + 2], NULL, dictionary, NULL, 0);
-
-			root_kid[cnt++] = ids[ptr->image_length + 2];
-		} else {
-			snprintf(buf, 64, "/Contents %d 0 R\n", ids[ptr->image_length]);
-			strcat(dictionary, buf);
-
-			/* Add /Parent when we know root */
-			pdf_obj_append(&pdf, ids[ptr->image_length + 1], NULL, dictionary, NULL, 0);
-
-			root_kid[cnt++] = ids[ptr->image_length + 1];
-		}
-
-		free(dictionary);
+		root_kid[cnt++] = ids[ptr->image_length + 2];
 
 		free(ids);
+		free(dictionary);
 
 		ptr = ptr->next;
 	}
@@ -1071,12 +1173,9 @@ cnki_pdf_hn(cnki_t **param)
 
 	int root = pdf_get_free_id(&pdf);
 
-	snprintf(buf, 64, "<<\n/Type /Pages\n/Kids ");
+	snprintf(buf, 64, "<<\n/Type /Pages\n/Kids [");
 	strcat(dictionary, buf);
 
-	if ((*param)->file_stat->page > 1)
-		strcat(dictionary, "[");
-
 	for (int i = 0; i < (*param)->file_stat->page; i++) {
 		snprintf(buf, 64, "%d 0 R", root_kid[i]);
 		strcat(dictionary, buf);
@@ -1084,12 +1183,7 @@ cnki_pdf_hn(cnki_t **param)
 			strcat(dictionary, " ");
 	}
 
-	if ((*param)->file_stat->page > 1)
-		strcat(dictionary, "]");
-
-	strcat(dictionary, "\n");
-
-	snprintf(buf, 64, "/Count %d\n", (*param)->file_stat->page);
+	snprintf(buf, 64, "]\n/Count %d\n", (*param)->file_stat->page);
 	strcat(dictionary, buf);
 
 	strcat(dictionary, ">>");
@@ -1098,16 +1192,6 @@ cnki_pdf_hn(cnki_t **param)
 
 	free(dictionary);
 
-	dictionary_size = 256;
-	dictionary = malloc(dictionary_size);
-
-	if (dictionary == NULL) {
-		free(root_kid);
-		return 1;
-	}
-
-	pdf_object_t *tmp = NULL;
-
 	/* Add /Parent to page object */
 	for (int i = 0; i < (*param)->file_stat->page; i++) {
 		if (pdf_get_obj(&pdf, root_kid[i], &tmp) != 0) {
@@ -1116,9 +1200,16 @@ cnki_pdf_hn(cnki_t **param)
 			return 1;
 		}
 
-		memset(dictionary, 0, dictionary_size);
+		dictionary_size = tmp->dictionary_size + 24;
+		dictionary = malloc(dictionary_size);
+
+		if (dictionary == NULL) {
+			free(root_kid);
+			return 1;
+		}
 
 		memcpy(dictionary, tmp->dictionary, tmp->dictionary_size);
+		memset(dictionary + tmp->dictionary_size, 0, 24);
 
 		snprintf(buf, 64, "/Parent %d 0 R\n>>", root);
 		strcat(dictionary, buf);
@@ -1128,10 +1219,20 @@ cnki_pdf_hn(cnki_t **param)
 			free(root_kid);
 			return 1;
 		}
+
+		free(dictionary);
 	}
 
 	free(root_kid);
 
+	dictionary_size = 128;
+	dictionary = malloc(dictionary_size);
+
+	if (dictionary == NULL) {
+		free(root_kid);
+		return 1;
+	}
+
 	memset(dictionary, 0, dictionary_size);
 
 	if ((*param)->stat > 0)

src/jbig2.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022, yzrh <yzrh@noema.org>
+ * Copyright (c) 2022-2023, yzrh <yzrh@noema.org>
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -31,5 +31,6 @@ strdec_jbig2(char **bitmap,
 	}
 
 	jbig2_release_page(ctx, image);
+	jbig2_ctx_free(ctx);
 	return 0;
 }

src/jp2.c

@@ -6,11 +6,7 @@
 
 #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;

src/md5.c

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2023, yzrh <yzrh@noema.org>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdlib.h>
+
+#include <openssl/md5.h>
+
+int
+strmd5(unsigned char **dst, int *dst_size,
+	const unsigned char * restrict src, int src_size)
+{
+	*dst_size = MD5_DIGEST_LENGTH;
+	*dst = malloc(*dst_size);
+
+	if (*dst == NULL)
+		return 1;
+
+	MD5(src, src_size, *dst);
+
+	return 0;
+}

src/md5.h

@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2023, yzrh <yzrh@noema.org>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+int
+strmd5(unsigned char **dst, int *dst_size,
+	const unsigned char * restrict src, int src_size);

src/pdf_get.c

@@ -89,7 +89,7 @@ pdf_get_free_id(pdf_object_t **pdf)
 
 	int id = 0;
 
-	for (int i = 1; i < 99999999; i++) {
+	for (int i = 1; i < 100000000; i++) {
 		ptr = (*pdf)->next;
 		while (ptr != NULL) {
 			if (ptr->id == i) {
@@ -123,7 +123,7 @@ pdf_get_free_ids(pdf_object_t **pdf, int **ids, int count)
 	int id = 0;
 
 	pdf_object_t *ptr;
-	for (int i = 1; i < 99999999; i++) {
+	for (int i = 1; i < 100000000; i++) {
 		ptr = (*pdf)->next;
 		while (ptr != NULL) {
 			if (ptr->id == i) {

src/pdf_parser.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020-2022, yzrh <yzrh@noema.org>
+ * Copyright (c) 2020-2023, yzrh <yzrh@noema.org>
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -19,26 +19,35 @@ static void *
 _memmem_whitespace(const void *p0, size_t s0, const void *p1, size_t s1)
 {
 	const char whitespace[6] = {
-		'\r',
-		'\n',
-		'\f',
-		'\t',
-		'\0',
-		' '
+		0x00,
+		0x09,
+		0x0a,
+		0x0c,
+		0x0d,
+		0x20
 	};
 
-	char tmp[s1 + 1];
-	memcpy(tmp, p1, s1);
+	char *ret = NULL;
 
-	char *ret;
+	char str[s1 + 1];
+	memcpy(str, p1, s1);
+
+	size_t tmp_size = 0;
+	char *tmp;
 
 	for (int i = 0; i < 6; i++) {
-		tmp[s1] = whitespace[i];
-		if((ret = memmem(p0, s0, tmp, s1 + 1)) != NULL)
-			return ret;
+		str[s1] = whitespace[i];
+
+		if ((tmp = memmem(p0, s0, str, s1 + 1)) == NULL)
+			continue;
+
+		if (tmp_size == 0 || (size_t) (tmp - (char *) p0) < tmp_size) {
+			tmp_size = tmp - (char *) p0;
+			ret = tmp;
+		}
 	}
 
-	return NULL;
+	return ret;
 }
 
 static int
@@ -57,23 +66,45 @@ _locate(pdf_object_t **pdf, FILE **fp, int size_buf)
 	end = ftell(*fp);
 	fseek(*fp, cur, SEEK_SET);
 
-	int head = 0;
-	int tail = 0;
+	long head = 0;
+	long tail = 0;
 	char *pos;
 	char *tmp;
 
 	for (;;) {
-		fread(buf, size_buf, 1, *fp);
+		if (cur + size_buf < end) {
+			fread(buf, size_buf, 1, *fp);
+		} else {
+			fread(buf, end - cur, 1, *fp);
+			memset(buf + end - cur, 0, size_buf - end + cur);
+		}
 
-		if (head == 0 && (pos = _memmem_whitespace(buf, size_buf, " 0 obj", 6)) != NULL)
-			head = cur + (pos - buf) + 7;
+		if (head == 0) {
+			/* Hack needed for invalid object */
+			pos = _memmem_whitespace(buf, size_buf, " 0 obj", 6);
+			tmp = memmem(buf, size_buf, " 0 obj", 6);
+
+			while (tmp != NULL && tmp[6] != 0x3c && tmp[6] != 0x5b)
+				tmp = memmem(tmp + 6, size_buf - (tmp - buf) - 6, " 0 obj", 6);
+
+			if (pos != NULL && tmp != NULL) {
+				if (pos - buf < tmp - buf)
+					head = cur + (pos - buf) + 7;
+				else
+					head = cur + (tmp - buf) + 6;
+			} else if (pos != NULL) {
+				head = cur + (pos - buf) + 7;
+			} else if (tmp != NULL) {
+				head = cur + (tmp - buf) + 6;
+			}
+		}
 
 		if (tail == 0 && (pos = _memmem_whitespace(buf, size_buf, "endobj", 6)) != NULL) {
 			/* We need to check if it is the object stored in stream */
 			while (memcmp(pos + 7,
 				"\r\nendstream", 11) == 0 &&
-				(tmp = _memmem_whitespace(pos + 6,
-				size_buf - (pos - buf) - 6,
+				(tmp = _memmem_whitespace(pos + 7,
+				size_buf - (pos - buf) - 7,
 				"endobj", 6)) != NULL)
 					pos = tmp;
 
@@ -102,13 +133,17 @@ _locate(pdf_object_t **pdf, FILE **fp, int size_buf)
 			ptr->address = head;
 			ptr->size = tail - head;
 
-			fseek(*fp, tail + 6, SEEK_SET);
+			fseek(*fp, tail + 7, SEEK_SET);
 			head = tail = 0;
+		} else if (head > 0 && tail > 0) {
+			if (cur + size_buf < end)
+				fseek(*fp, head, SEEK_SET);
+			tail = 0;
 		} else {
-			fseek(*fp, -6, SEEK_CUR);
+			fseek(*fp, -7, SEEK_CUR);
 		}
 
-		if ((cur = ftell(*fp)) + 6 >= end)
+		if ((cur = ftell(*fp)) + 7 >= end)
 			break;
 	}
 
@@ -138,34 +173,86 @@ pdf_load(pdf_object_t **pdf, FILE **fp, int size_buf)
 		if (buf == NULL)
 			return 1;
 
-		memset(buf, 0, ptr->size);
+		fseek(*fp, ptr->address, SEEK_SET);
+		fread(buf, ptr->size, 1, *fp);
 
-		fseek(*fp, ptr->address - 12, SEEK_SET);
+		/* Handle incomplete object */
+		head = buf;
+		while ((tmp = _memmem_whitespace(head,
+			ptr->size - (head - buf),
+			" 0 obj", 6)) != NULL)
+			head = tmp + 7;
+
+		/* Hack needed for invalid object */
+		while ((tmp = memmem(head,
+			ptr->size - (head - buf),
+			" 0 obj", 6)) != NULL)
+			head = tmp + 6;
+
+		if (head - buf > 0) {
+			ptr->address += head - buf;
+			ptr->size -= head - buf;
+
+			tmp = realloc(buf, ptr->size);
+
+			if (tmp == NULL)
+				return 1;
+
+			buf = tmp;
+
+			fseek(*fp, ptr->address, SEEK_SET);
+			fread(buf, ptr->size, 1, *fp);
+		}
+
+		/* Hack needed for invalid object */
+		fseek(*fp, ptr->address - 14, SEEK_SET);
 		fread(str, 8, 1, *fp);
 
-		for (int i = 0; i < 8; i++) {
-			if (str[i] >= '0' && str[i] <= '9') {
-				ptr->id = atoi(str + i);
+		if (str[7] < '0' || str[7] > '9') {
+			fseek(*fp, ptr->address - 15, SEEK_SET);
+			fread(str, 8, 1, *fp);
+		}
+
+		for (int i = 7; i >= 0; i--) {
+			if (str[i] < '0' || str[i] > '9') {
+				if (i < 7)
+					ptr->id = atoi(str + i + 1);
+				else
+					ptr->id = 0;
+
 				break;
 			}
 		}
 
-		fseek(*fp, ptr->address, SEEK_SET);
-		fread(buf, ptr->size, 1, *fp);
-
 		if ((head = memmem(buf, ptr->size, "<<", 2)) != NULL &&
-			(tail = _memmem_whitespace(buf, ptr->size, ">>", 2)) != NULL) {
-			/*
-			 * A dictionary object may have nested dictionary,
-			 * but it should not be in a stream
-			 */
-			while ((tmp = _memmem_whitespace(tail + 2,
-				ptr->size - (tail - buf) - 2,
-				">>", 2)) != NULL &&
-				memmem(tail + 2,
-				ptr->size - (tail - buf) - 2,
-				"stream\r\n", 8) == NULL)
-				tail = tmp;
+			((tail = _memmem_whitespace(buf, ptr->size, ">>", 2)) != NULL ||
+			/* Hack needed for invalid object */
+			(tail = memmem(buf, ptr->size, ">>", 2)) != NULL)) {
+			if (memmem(buf, tail - buf, "stream\r\n", 8) != NULL) {
+				tail = memmem(buf, ptr->size, ">>", 2);
+
+				while (ptr->size - (tail - buf) > 2 &&
+					(tmp = memmem(tail + 2,
+					ptr->size - (tail - buf) - 2,
+					">>", 2)) != NULL &&
+					memmem(tail + 2,
+					(tmp - tail) - 2,
+					"stream\r\n", 8) == NULL)
+					tail = tmp;
+			} else {
+				/*
+				 * A dictionary object may have nested dictionary,
+				 * but it should not be in a stream
+				 */
+				while (ptr->size - (tail - buf) > 3 &&
+					(tmp = _memmem_whitespace(tail + 3,
+					ptr->size - (tail - buf) - 3,
+					">>", 2)) != NULL &&
+					memmem(tail + 3,
+					(tmp - tail) - 3,
+					"stream\r\n", 8) == NULL)
+					tail = tmp;
+			}
 
 			ptr->dictionary_size = tail - head + 2;
 			ptr->dictionary = malloc(ptr->dictionary_size + 1);
@@ -173,8 +260,8 @@ pdf_load(pdf_object_t **pdf, FILE **fp, int size_buf)
 			if (ptr->dictionary == NULL)
 				return 1;
 
-			memset(ptr->dictionary, 0, ptr->dictionary_size + 1);
 			memcpy(ptr->dictionary, head, ptr->dictionary_size);
+			memset(ptr->dictionary + ptr->dictionary_size, 0, 1);
 
 			if ((head = memmem(tail,
 				ptr->size - (tail - buf),
@@ -187,11 +274,11 @@ pdf_load(pdf_object_t **pdf, FILE **fp, int size_buf)
 				 * contains another object that
 				 * contains another stream
 				 */
-				while (_memmem_whitespace(tail,
-					ptr->size - (tail - buf),
+				while (_memmem_whitespace(tail + 10,
+					ptr->size - (tail - buf) - 10,
 					"endobj", 6) != NULL &&
-					(tmp = _memmem_whitespace(tail + 9,
-					ptr->size - (tail - buf) - 9,
+					(tmp = _memmem_whitespace(tail + 10,
+					ptr->size - (tail - buf) - 10,
 					"endstream", 9)) != NULL)
 						tail = tmp;
 
@@ -203,19 +290,13 @@ pdf_load(pdf_object_t **pdf, FILE **fp, int size_buf)
 
 				memcpy(ptr->stream, head + 8, ptr->stream_size);
 			}
+
+			free(buf);
 		} else {
 			ptr->object_size = ptr->size;
-			ptr->object = malloc(ptr->object_size + 1);
-
-			if (ptr->object == NULL)
-				return 1;
-
-			memset(ptr->object, 0, ptr->object_size + 1);
-			memcpy(ptr->object, buf, ptr->object_size);
+			ptr->object = buf;
 		}
 
-		free(buf);
-
 		ptr = ptr->next;
 	}
 

src/pdf_writer.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020-2022, yzrh <yzrh@noema.org>
+ * Copyright (c) 2020-2023, yzrh <yzrh@noema.org>
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -8,14 +8,32 @@
 #include <string.h>
 #include <time.h>
 
-#include <openssl/md5.h>
-
+#include "version.h"
+#include "md5.h"
 #include "pdf.h"
 
+static int
+_info_obj(pdf_object_t **pdf)
+{
+	char dictionary[128] = "<<\n"
+		"/Producer (Melon " VERSION "." RELEASE "." PATCH EXTRA ")\n"
+		"/CreationDate (D:";
+
+	char buf[64];
+
+	time_t timestamp = time(NULL);
+
+	strftime(buf, 64, "%Y%m%d%H%M%S", gmtime(&timestamp));
+	strcat(dictionary, buf);
+	strcat(dictionary, "+00'00')\n>>");
+
+	return pdf_obj_append(pdf, 0, NULL, dictionary, NULL, 0);
+}
+
 int
 pdf_dump_obj(pdf_object_t **pdf, FILE **fp)
 {
-	if (*pdf == NULL || *fp == NULL)
+	if (*pdf == NULL || *fp == NULL || _info_obj(pdf) != 0)
 		return 1;
 
 	long cur;
@@ -144,35 +162,28 @@ pdf_dump_trailer(pdf_object_t **pdf, FILE **fp, int xref)
 	buf_size = snprintf(buf, 64, "%lx%x", timestamp, size);
 #endif
 
-	unsigned char str[64];
-	memcpy(str, buf, 64);
+	int fid_size;
+	unsigned char *fid;
 
-	unsigned char fid[MD5_DIGEST_LENGTH];
-	MD5(str, buf_size, fid);
+	if (strmd5(&fid, &fid_size, (unsigned char *) buf, buf_size) != 0)
+		return 1;
 
 	pdf_object_t *ptr = *pdf;
 	while (ptr->next != NULL)
 		ptr = ptr->next;
 
-	/*
-	 * TODO: Document information dictionary
-	 * `"/Producer (Melon)"'
-	 * `"/CreationDate (D:YYYYMMDDHHmmSS+00'00')"'
-	 *
-	 * Trailer dictionary
-	 * `"/Info %d 0 R"'
-	 */
 	fprintf(*fp,
-		"/Size %d\n/Root %d 0 R\n",
+		"/Size %d\n/Root %d 0 R\n/Info %d 0 R\n",
 		ptr->id + 1,
-		pdf_get_catalog_id(pdf));
+		pdf_get_catalog_id(pdf),
+		ptr->id);
 
 	fputs("/ID [", *fp);
 
 	for (int i = 0; i < 2; i++) {
 		fputs("<", *fp);
 
-		for (int j = 0; j < MD5_DIGEST_LENGTH; j++)
+		for (int j = 0; j < fid_size; j++)
 			fprintf(*fp, "%02x", fid[j]);
 
 		fputs(">", *fp);
@@ -191,5 +202,7 @@ pdf_dump_trailer(pdf_object_t **pdf, FILE **fp, int xref)
 
 	fputs("%%EOF\n", *fp);
 
+	free(fid);
+
 	return 0;
 }

src/version.h

@@ -1,10 +1,10 @@
 /*
- * Copyright (c) 2020-2022, yzrh <yzrh@noema.org>
+ * Copyright (c) 2020-2023, yzrh <yzrh@noema.org>
  *
  * SPDX-License-Identifier: Apache-2.0
  */
 
 #define VERSION	"0"
-#define RELEASE	"2"
-#define PATCH	"2"
+#define RELEASE	"3"
+#define PATCH	"0"
 #define EXTRA	""