From 62b9db8b87aef70ba5d76542ebcf90ae872ea940 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Sun, 13 Nov 2016 23:46:38 -0500
Subject: logic: added pe_get_roffset_from_rva(), pe_get_rva_from_roffset().

---
 include/perk/perk.h           |  4 ++++
 src/logic/pe_get_image_meta.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/include/perk/perk.h b/include/perk/perk.h
index 988e0f6..3918d24 100644
--- a/include/perk/perk.h
+++ b/include/perk/perk.h
@@ -216,6 +216,10 @@ perk_api void pe_free_image_meta	(struct pe_image_meta *);
 
 perk_api int  pe_get_named_section_index(const struct pe_image_meta *, const char * name);
 perk_api int  pe_get_block_section_index(const struct pe_image_meta *, const struct pe_block *);
+
+perk_api int  pe_get_roffset_from_rva	(const struct pe_image_meta *, uint32_t rva, uint32_t * roffset);
+perk_api int  pe_get_rva_from_roffset	(const struct pe_image_meta *, uint32_t roffset, uint32_t * rva);
+
 perk_api int  pe_get_expsym_by_name	(const struct pe_image_meta *, const char * name, struct pe_expsym * optional);
 perk_api int  pe_get_expsym_by_index	(const struct pe_image_meta *, unsigned index, struct pe_expsym * optional);
 
diff --git a/src/logic/pe_get_image_meta.c b/src/logic/pe_get_image_meta.c
index ee2b632..5f31a9a 100644
--- a/src/logic/pe_get_image_meta.c
+++ b/src/logic/pe_get_image_meta.c
@@ -59,6 +59,49 @@ int pe_get_block_section_index(const struct pe_image_meta * m, const struct pe_b
 	return -1;
 }
 
+int pe_get_roffset_from_rva(const struct pe_image_meta * m, uint32_t rva, uint32_t * roffset)
+{
+	int i;
+	uint32_t low,high;
+
+	for (i=0; i<m->coff.num_of_sections; i++) {
+		low  = m->sectbl[i].virtual_addr;
+		high = low + m->sectbl[i].virtual_size;
+
+		if ((rva >= low) && (rva < high)) {
+			*roffset = (rva - low) + m->sectbl[i].ptr_to_raw_data;
+			return 0;
+		}
+	}
+
+	return -1;
+}
+
+int pe_get_rva_from_roffset(const struct pe_image_meta * m, uint32_t roffset, uint32_t * rva)
+{
+	int i;
+	uint32_t low,high,ref;
+
+	for (i=0, ref=-1; i<m->coff.num_of_sections; i++) {
+		low  = m->sectbl[i].ptr_to_raw_data;
+		high = low + m->sectbl[i].virtual_size;
+
+		if ((roffset >= low) && (roffset < high)) {
+			*rva = (roffset - low) + m->sectbl[i].virtual_addr;
+			return 0;
+		} else if (ref > low) {
+			ref = low;
+		}
+	}
+
+	if (roffset < ref) {
+		*rva = roffset;
+		return 0;
+	}
+
+	return -1;
+}
+
 int pe_get_expsym_by_name(
 	const struct pe_image_meta *	m,
 	const char *			name,
-- 
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