Initial commit.

1 files changed, 351 insertions, 0 deletions

diff --git a/src/cnki_pdf.c b/src/cnki_pdf.c
new file mode 100644
index 0000000..e56decb
--- /dev/null
+++ b/src/cnki_pdf.c
@@ -0,0 +1,351 @@
+/*
+ * Copyright (c) 2020, yzrh <yzrh@tuta.io>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "cnki.h"
+#include "pdf.h"
+#include "pdf_cnki.h"
+
+int
+cnki_pdf(cnki_t **param)
+{
+	if (*param == NULL)
+		return 1;
+
+	pdf_object_t *pdf = NULL;
+
+	if (pdf_obj_create(&pdf) != 0)
+		return 1;
+
+	if ((*param)->stat > 0)
+		printf("Begin processing PDF\n");
+
+	if ((*param)->stat > 1)
+		printf("Loading object(s)\n");
+
+	if (pdf_load(&pdf, &(*param)->fp_i, (*param)->size_buf) != 0)
+		return 1;
+
+	if ((*param)->stat > 1) {
+		printf("\t%8s\t%8s\t%8s\t%12s\t%12s\t%12s\n",
+			"address",
+			"size",
+			"id",
+			"object",
+			"dictionary",
+			"stream");
+
+		pdf_object_t *ptr = pdf->next;
+		while (ptr != NULL) {
+			printf("\t%08x\t%8d\t%8d\t%12d\t%12d\t%12d\n",
+				ptr->address,
+				ptr->size,
+				ptr->id,
+				ptr->object_size,
+				ptr->dictionary_size,
+				ptr->stream_size);
+			ptr = ptr->next;
+		}
+	}
+
+	if ((*param)->stat > 0)
+		printf("Loaded %d object(s)\n",
+			pdf_get_count(&pdf));
+
+	if ((*param)->stat > 1)
+		printf("Searching for parent object(s)\n");
+
+	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]);
+
+	char buf[64];
+
+	int parent_missing[parent[0]];
+	int *kid;
+	int dictionary_size;
+	char *dictionary;
+
+	for (int i = 1; i <= parent[0]; i++) {
+		if ((*param)->stat > 1)
+			printf("Searching for object %d\n", parent[i]);
+
+		kid = NULL;
+		pdf_get_kid_id(&pdf, parent[i], &kid);
+
+		if (kid[0] != 0) {
+			if ((*param)->stat > 0)
+				printf("Object is missing\n");
+
+			if ((*param)->stat > 1)
+				printf("Generating object\n");
+
+			dictionary_size = 64 + 12 * kid[0];
+			dictionary = malloc(dictionary_size);
+
+			if (dictionary == NULL)
+				return 1;
+
+			memset(dictionary, 0, dictionary_size);
+
+			snprintf(buf, 64,
+				"<<\n/Type /Pages\n/Kids [");
+			strcat(dictionary, buf);
+			for (int j = 1; j <= kid[0]; j++) {
+				snprintf(buf, 64,
+					"%d 0 R",
+					kid[j]);
+				strcat(dictionary, buf);
+				if (j < kid[0])
+					strcat(dictionary, " ");
+			}
+			snprintf(buf, 64,
+				"]\n/Count %d\n>>\n",
+				pdf_get_kid_count(&pdf, parent[i]));
+			strcat(dictionary, buf);
+
+			pdf_obj_prepend(&pdf, parent[i], NULL, dictionary, NULL);
+
+			parent_missing[i - 1] = 1;
+
+			if ((*param)->stat > 0)
+				printf("Generated object for %d child(ren)\n",
+					kid[0]);
+
+			free(dictionary);
+		} else {
+			parent_missing[i - 1] = 0;
+
+			if ((*param)->stat > 0)
+				printf("Object exists\n");
+		}
+
+		free(kid);
+	}
+
+	if ((*param)->stat > 1)
+		printf("Searching for root object\n");
+
+	dictionary_size = 128;
+	dictionary = malloc(dictionary_size);
+
+	if (dictionary == NULL)
+		return 1;
+
+	memset(dictionary, 0, dictionary_size);
+
+	int root = 0;
+
+	int root_kid = 0;
+	for (int i = 0; i < parent[0]; i++)
+		if (parent_missing[i])
+			root_kid++;
+
+	if (root_kid <= 1) {
+		if (root_kid == 0) {
+			for (int i = 1; i <= parent[0]; i++)
+				if (root == 0 || root < parent[i])
+					root = parent[i];
+		} else {
+			for (int i = 0; i < parent[0]; i++)
+				if (parent_missing[i])
+					root = i;
+		}
+
+		if ((*param)->stat > 0)
+			printf("Root object is %d.\n",
+				root);
+	} else {
+		if ((*param)->stat > 0)
+			printf("Root object is missing\n");
+
+		if ((*param)->stat > 1)
+			printf("Generating root object\n");
+
+		root = pdf_get_free_id(&pdf);
+
+		snprintf(buf, 64,
+			"<<\n/Type /Pages\n/Kids ");
+		strcat(dictionary, buf);
+
+		if (parent[0] > 1)
+			strcat(dictionary, "[");
+
+		for (int i = 0; i < parent[0]; i++) {
+			if (parent_missing[i]) {
+				snprintf(buf, 64, "%d 0 R", parent[i + 1]);
+				strcat(dictionary, buf);
+				if (i < root_kid)
+					strcat(dictionary, " ");
+			}
+		}
+
+		if (parent[0] > 1)
+			strcat(dictionary, "]");
+
+		strcat(dictionary, "\n");
+
+		snprintf(buf, 64, "/Count %d\n", (*param)->file_stat->page);
+		strcat(dictionary, buf);
+
+		strcat(dictionary, ">>\n");
+
+		pdf_obj_prepend(&pdf, root, NULL, dictionary, NULL);
+
+		memset(dictionary, 0, dictionary_size);
+
+		if ((*param)->stat > 0)
+			printf("Generated root object %d.\n",
+				root);
+	}
+
+	int *ids = NULL;
+
+	if ((*param)->file_stat->outline > 0) {
+		if ((*param)->stat > 1)
+			printf("Generating outline object(s)\n\t%8s\n", "id");
+
+		pdf_get_free_ids(&pdf, &ids, (*param)->file_stat->outline + 1);
+		int outline = pdf_cnki_outline(&pdf, &(*param)->object_outline, &ids);
+
+		if ((*param)->stat > 1)
+			for (int i = 0; i < (*param)->file_stat->outline + 1; i++)
+				printf("\t%8d\n", ids[i]);
+
+		if ((*param)->stat > 0) {
+			if (outline != 0)
+				printf("No outline information\n");
+			else
+				printf("Generated %d outline object(s)\n",
+					(*param)->file_stat->outline + 1);
+		}
+	}
+
+	if ((*param)->stat > 1)
+		printf("Generating '/Catalog' dictionary\n");
+
+	snprintf(buf, 64,
+		"<<\n/Type /Catalog\n/Pages %d 0 R\n",
+		root);
+	strcat(dictionary, buf);
+
+	if (ids != NULL) {
+		snprintf(buf, 64,
+			"/Outlines %d 0 R\n/PageMode /UseOutlines\n",
+			ids[0]);
+		strcat(dictionary, buf);
+	}
+
+	strcat(dictionary, ">>\n");
+
+	pdf_obj_append(&pdf, 0, NULL, dictionary, NULL);
+
+	free(dictionary);
+
+	if ((*param)->stat > 0)
+		printf("Generated '/Catalog' dictionary\n");
+
+	if ((*param)->stat > 1)
+		printf("Sorting object(s)\n");
+
+	pdf_obj_sort(&pdf);
+
+	if ((*param)->stat > 0)
+		printf("Sorted object(s)\n");
+
+	if ((*param)->stat > 1)
+		printf("Writing header\n");
+
+	long cur = 0;
+
+	if ((*param)->stat > 0)
+		cur = ftell((*param)->fp_o);
+
+	if (pdf_dump_header(&pdf, &(*param)->fp_o) != 0) {
+		fprintf(stderr, "Header not written\n");
+		return 1;
+	} else {
+		if ((*param)->stat > 0)
+			printf("Header %ld byte(s) written\n",
+				ftell((*param)->fp_o) - cur);
+	}
+
+	if ((*param)->stat > 1)
+		printf("Writing object(s)\n");
+
+	pdf_dump_obj(&pdf, &(*param)->fp_o);
+
+	if ((*param)->stat > 1) {
+		printf("\t%8s\t%8s\t%8s\t%12s\t%12s\t%12s\n",
+			"address",
+			"size",
+			"id",
+			"object",
+			"dictionary",
+			"stream");
+
+		pdf_object_t *ptr = pdf->next;
+		while (ptr != NULL) {
+			printf("\t%08x\t%8d\t%8d\t%12d\t%12d\t%12d\n",
+				ptr->address,
+				ptr->size,
+				ptr->id,
+				ptr->object_size,
+				ptr->dictionary_size,
+				ptr->stream_size);
+			ptr = ptr->next;
+		}
+	}
+
+	if ((*param)->stat > 0)
+		printf("%d object(s) %ld byte(s) written\n",
+			pdf_get_count(&pdf),
+			ftell((*param)->fp_o));
+
+	long xref = ftell((*param)->fp_o);
+
+	if ((*param)->stat > 1)
+		printf("Writing cross-reference table\n");
+
+	if (pdf_dump_xref(&pdf, &(*param)->fp_o) != 0) {
+		if ((*param)->stat > 0)
+			printf("Cross-reference table not written\n");
+	} else {
+		if ((*param)->stat > 0)
+			printf("Cross-reference table %ld byte(s) written\n",
+				ftell((*param)->fp_o) - xref);
+	}
+
+	if ((*param)->stat > 1)
+		printf("Writing trailer\n");
+
+	if ((*param)->stat > 0)
+		cur = ftell((*param)->fp_o);
+
+	if (pdf_dump_trailer(&pdf, &(*param)->fp_o, xref) != 0) {
+		if ((*param)->stat > 0)
+			printf("Trailer not written\n");
+	} else {
+		if ((*param)->stat > 0)
+			printf("Trailer %ld byte(s) written\n",
+				ftell((*param)->fp_o) - cur);
+	}
+
+	if ((*param)->stat > 0)
+		printf("Total %ld byte(s) written\n",
+			ftell((*param)->fp_o));
+
+	pdf_obj_destroy(&pdf);
+
+	return 0;
+}