From 25e093f839419ba0805408bfeccdc5facdc5a042 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Feb 20 2019 02:20:18 +0000
Subject: PE section interfaces: added pe_get_image_block_section_addr().


---

diff --git a/include/pemagine/pemagine.h b/include/pemagine/pemagine.h
index 518b567..ba70edc 100644
--- a/include/pemagine/pemagine.h
+++ b/include/pemagine/pemagine.h
@@ -210,6 +210,7 @@ pe_api union  pe_raw_opt_hdr *		pe_get_image_opt_hdr_addr	(const void * base);
 pe_api struct pe_raw_data_dirs *	pe_get_image_data_dirs_addr	(const void * base);
 pe_api struct pe_raw_sec_hdr *		pe_get_image_section_tbl_addr	(const void * base);
 pe_api struct pe_raw_sec_hdr *		pe_get_image_named_section_addr	(const void * base, const char * name);
+pe_api struct pe_raw_sec_hdr *		pe_get_image_block_section_addr (const void * base, uint32_t blk_rva, uint32_t blk_size);
 pe_api struct pe_raw_export_hdr *	pe_get_image_export_hdr_addr	(const void * base, uint32_t * sec_size);
 pe_api struct pe_raw_import_hdr *	pe_get_image_import_dir_addr	(const void * base, uint32_t * sec_size);
 
diff --git a/src/headers/pe_get_image_section_tbl_addr.c b/src/headers/pe_get_image_section_tbl_addr.c
index 56c55a6..98f9dd4 100644
--- a/src/headers/pe_get_image_section_tbl_addr.c
+++ b/src/headers/pe_get_image_section_tbl_addr.c
@@ -75,3 +75,41 @@ struct pe_raw_sec_hdr * pe_get_image_named_section_addr(const void * base, const
 
 	return 0;
 }
+
+
+struct pe_raw_sec_hdr * pe_get_image_block_section_addr(
+	const void * base,
+	uint32_t     blk_rva,
+	uint32_t     blk_size)
+{
+	uint32_t			low,size;
+	uint16_t			count;
+	struct pe_raw_sec_hdr *		hdr;
+	struct pe_raw_coff_image_hdr *	coff;
+
+	if (!(hdr = pe_get_image_section_tbl_addr(base)))
+		return 0;
+
+	if (!(coff = pe_get_image_coff_hdr_addr(base)))
+		return 0;
+
+	count  = coff->cfh_num_of_sections[1] << 8;
+	count += coff->cfh_num_of_sections[0];
+
+	for (; count; hdr++,count--) {
+		low   = hdr->sh_virtual_addr[3] << 24;
+		low  += hdr->sh_virtual_addr[2] << 16;
+		low  += hdr->sh_virtual_addr[1] << 8;
+		low  += hdr->sh_virtual_addr[0];
+
+		size  = hdr->sh_virtual_size[3] << 24;
+		size += hdr->sh_virtual_size[2] << 16;
+		size += hdr->sh_virtual_size[1] << 8;
+		size += hdr->sh_virtual_size[0];
+
+		if ((low <= blk_rva) && (blk_rva + blk_size <= low + size))
+			return hdr;
+	}
+
+	return 0;
+}