Blame src/headers/pe_get_image_section_tbl_addr.c

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/*****************************************************************************/
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/*  pemagination: a (virtual) tour into portable bits and executable bytes   */
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/*  Copyright (C) 2013--2017  Z. Gilboa                                      */
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/*  Released under GPLv2 and GPLv3; see COPYING.PEMAGINE.                    */
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/*****************************************************************************/
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#include <psxtypes/psxtypes.h>
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#include <pemagine/pe_consts.h>
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#include <pemagine/pe_structs.h>
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#include <pemagine/pemagine.h>
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#include "pe_impl.h"
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struct pe_raw_sec_hdr * pe_get_image_section_tbl_addr(const void * base)
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{
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	struct pe_raw_coff_image_hdr *	coff;
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	union  pe_raw_opt_hdr *		opt;
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	unsigned char *			mark;
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	if (!(coff = pe_get_image_coff_hdr_addr(base)))
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		return 0;
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	if (!(opt = pe_get_image_opt_hdr_addr(base)))
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		return 0;
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	mark  = opt->opt_hdr_32.coh_magic;
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	mark += coff->cfh_size_of_opt_hdr[1] << 8;
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	mark += coff->cfh_size_of_opt_hdr[0];
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	return (struct pe_raw_sec_hdr *)mark;
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}
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struct pe_raw_sec_hdr * pe_get_image_named_section_addr(const void * base, const char * name)
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{
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	uint16_t			count;
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	struct pe_raw_sec_hdr *		hdr;
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	struct pe_raw_coff_image_hdr *	coff;
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	char *				ch;
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	size_t				len;
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	uint32_t			pos;
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	uint64_t			sname;
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	uint64_t *			shname;
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	if (!(hdr = pe_get_image_section_tbl_addr(base)))
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		return 0;
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	if (!(coff = pe_get_image_coff_hdr_addr(base)))
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		return 0;
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	count  = coff->cfh_num_of_sections[1] << 8;
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	count += coff->cfh_num_of_sections[0];
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	if ((len = pe_impl_strlen_ansi(name)) > 8) {
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		/* todo: long name support */
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		return 0;
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	} else if (len == 0) {
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		return 0;
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	} else {
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		sname = 0;
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		ch    = (char *)&sname;
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		for (pos=0; pos
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			ch[pos] = name[pos];
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		for (; count; hdr++,count--) {
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			shname = (uint64_t *)&hdr->sh_name[0];
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			if (*shname == sname)
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				return hdr;
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		}
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	}
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	return 0;
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}
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struct pe_raw_sec_hdr * pe_get_image_block_section_addr(
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	const void * base,
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	uint32_t     blk_rva,
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	uint32_t     blk_size)
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{
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	uint32_t			low,size;
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	uint16_t			count;
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	struct pe_raw_sec_hdr *		hdr;
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	struct pe_raw_coff_image_hdr *	coff;
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	if (!(hdr = pe_get_image_section_tbl_addr(base)))
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		return 0;
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	if (!(coff = pe_get_image_coff_hdr_addr(base)))
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		return 0;
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	count  = coff->cfh_num_of_sections[1] << 8;
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	count += coff->cfh_num_of_sections[0];
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	for (; count; hdr++,count--) {
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		low   = hdr->sh_virtual_addr[3] << 24;
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		low  += hdr->sh_virtual_addr[2] << 16;
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		low  += hdr->sh_virtual_addr[1] << 8;
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		low  += hdr->sh_virtual_addr[0];
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		size  = hdr->sh_virtual_size[3] << 24;
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		size += hdr->sh_virtual_size[2] << 16;
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		size += hdr->sh_virtual_size[1] << 8;
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		size += hdr->sh_virtual_size[0];
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		if ((low <= blk_rva) && (blk_rva + blk_size <= low + size))
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			return hdr;
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	}
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	return 0;
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}