/*******************************************************************/
/*  slibtool: a skinny libtool implementation, written in C        */
/*  Copyright (C) 2016--2024  SysDeer Technologies, LLC            */
/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
/*******************************************************************/

#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>

#include <slibtool/slibtool.h>
#include <slibtool/slibtool_arbits.h>
#include "slibtool_ar_impl.h"
#include "slibtool_driver_impl.h"
#include "slibtool_errinfo_impl.h"
#include "slibtool_visibility_impl.h"

/* transient header info vector */
struct ar_header_info {
	struct ar_raw_file_header * phdr;
	uint32_t                    attr;
};

static const char ar_signature[] = AR_SIGNATURE;

static int slbt_ar_free_archive_meta_impl(struct slbt_archive_meta_impl * meta, int ret)
{
	if (meta) {
		if (meta->armaps.armap_symrefs_32)
			free(meta->armaps.armap_symrefs_32);

		if (meta->armaps.armap_symrefs_64)
			free(meta->armaps.armap_symrefs_64);

		if (meta->hdrinfov)
			free(meta->hdrinfov);

		if (meta->namestrs)
			free(meta->namestrs);

		if (meta->syminfo)
			free(meta->syminfo);

		if (meta->syminfv)
			free(meta->syminfv);

		if (meta->memberv)
			free(meta->memberv);

		if (meta->offsetv)
			free(meta->offsetv);

		if (meta->members)
			free(meta->members);

		if (meta->symstrv)
			free(meta->symstrv);

		if (meta->mapstrv)
			free(meta->mapstrv);

		if (meta->nminfo)
			slbt_lib_free_txtfile_ctx(meta->nminfo);

		free(meta);
	}

	return ret;
}


static int slbt_ar_read_octal(const char * mark, int len, uint32_t * dec)
{
	int       i;
	uint64_t  res;

	for (; len && (mark[len-1]==AR_DEC_PADDING); )
		len--;

	for (i=0,res=0; i<len; i++) {
		if ((mark[i] >= '0') && (mark[i] <= '7')) {
			res *= 8;
			res += (mark[i] - '0');
		} else {
			return -1;
		}
	}

	*dec = res;

	return 0;
}

static int slbt_ar_read_decimal_64(const char * mark, int len, uint64_t * dec)
{
	int       i;
	uint64_t  res;

	for (; len && (mark[len-1]==AR_DEC_PADDING); )
		len--;

	for (i=0,res=0; i<len; i++) {
		if ((mark[i] >= '0') && (mark[i] <= '9')) {
			res *= 10;
			res += (mark[i] - '0');
		} else {
			return -1;
		}
	}

	*dec = res;

	return 0;
}

static int slbt_ar_read_decimal_32(const char * mark, int len, uint32_t * dec)
{
	uint64_t res;

	if (slbt_ar_read_decimal_64(mark,len,&res) < 0)
		return -1;

	*dec = res;

	return 0;
}

static uint32_t slbt_ar_get_member_attr(struct ar_meta_member_info * m)
{
	const char *            hdrname;
	uint32_t                hdrattr;
	const char *            data;
	const char *            data_cap;
	const unsigned char *   udata;
	unsigned char           uch;
	const size_t            siglen = sizeof(struct ar_raw_signature);

	hdrname  = m->ar_file_header.ar_member_name;
	hdrattr  = m->ar_file_header.ar_header_attr;

	data     = m->ar_object_data;
	data_cap = &data[m->ar_file_header.ar_file_size];

	if (hdrattr & AR_HEADER_ATTR_SYSV) {
		/* long names member? */
		if ((hdrname[0] == '/') && (hdrname[1] == '/'))
			return AR_MEMBER_ATTR_NAMESTRS;

		/* mips 64-bit armap member? */
		else if (!strncmp(hdrname,"/SYM64/",7))
			return AR_MEMBER_ATTR_ARMAP;

		/* armap member? */
		else if (hdrname[0] == '/' && (hdrname[1] == '\0'))
			return AR_MEMBER_ATTR_ARMAP;

		/* nested archive? */
		else if (m->ar_file_header.ar_file_size >= siglen)
			if (!strncmp(data,ar_signature,siglen))
				return AR_MEMBER_ATTR_ARCHIVE;

	} else if (hdrattr & AR_HEADER_ATTR_BSD) {
		if (!strcmp(hdrname,"__.SYMDEF"))
			return AR_MEMBER_ATTR_ARMAP;

		else if (!strcmp(hdrname,"__.SYMDEF SORTED"))
			return AR_MEMBER_ATTR_ARMAP;

		else if (!strcmp(hdrname,"__.SYMDEF_64"))
			return AR_MEMBER_ATTR_ARMAP;

		else if (!strcmp(hdrname,"__.SYMDEF_64 SORTED"))
			return AR_MEMBER_ATTR_ARMAP;
	}

	/* ascii only data? */
	for (; data<data_cap; ) {
		if ((uch = *data) >= 0x80)
			break;

		data++;
	}

	if (data == data_cap)
		return AR_MEMBER_ATTR_ASCII;

	data  = m->ar_object_data;
	udata = (unsigned char *)data;

	/* elf object? [quick and dirty] */
	if (m->ar_file_header.ar_file_size >= 5)
		if ((udata[0] == 0x7f)
				&& (udata[1] == 'E')
				&& (udata[2] == 'L')
				&& (udata[3] == 'F'))
			if ((m->ar_object_attr = AR_OBJECT_ATTR_ELF))
				return AR_MEMBER_ATTR_OBJECT;

	/* coff i386 object? [quick and dirty] */
	if (m->ar_file_header.ar_file_size >= 2)
		if ((udata[0] == 0x4c) && (udata[1] == 0x01))
			if ((m->ar_object_attr = AR_OBJECT_ATTR_COFF))
				return AR_MEMBER_ATTR_OBJECT;

	/* coff x86_64 object? [quick and dirty] */
	if (m->ar_file_header.ar_file_size >= 2)
		if ((udata[0] == 0x64) && (udata[1] == 0x86))
			if ((m->ar_object_attr = AR_OBJECT_ATTR_COFF))
				return AR_MEMBER_ATTR_OBJECT;

	/* big endian 32-bit macho object? [quick and dirty] */
	if (m->ar_file_header.ar_file_size >= 4)
		if ((udata[0] == 0xfe) && (udata[1] == 0xed))
			if ((udata[2] == 0xfa) && (udata[3] == 0xce))
				if ((m->ar_object_attr = AR_OBJECT_ATTR_MACHO))
					return AR_MEMBER_ATTR_OBJECT;

	/* big endian 64-bit macho object? [quick and dirty] */
	if (m->ar_file_header.ar_file_size >= 4)
		if ((udata[0] == 0xfe) && (udata[1] == 0xed))
			if ((udata[2] == 0xfa) && (udata[3] == 0xcf))
				if ((m->ar_object_attr = AR_OBJECT_ATTR_MACHO))
					return AR_MEMBER_ATTR_OBJECT;

	/* little endian 32-bit macho object? [quick and dirty] */
	if (m->ar_file_header.ar_file_size >= 4)
		if ((udata[3] == 0xfe) && (udata[2] == 0xed))
			if ((udata[1] == 0xfa) && (udata[0] == 0xce))
				if ((m->ar_object_attr = AR_OBJECT_ATTR_MACHO))
					return AR_MEMBER_ATTR_OBJECT;

	/* little endian 64-bit macho object? [quick and dirty] */
	if (m->ar_file_header.ar_file_size >= 4)
		if ((udata[3] == 0xfe) && (udata[2] == 0xed))
			if ((udata[1] == 0xfa) && (udata[0] == 0xcf))
				if ((m->ar_object_attr = AR_OBJECT_ATTR_MACHO))
					return AR_MEMBER_ATTR_OBJECT;

	/* all other */
	return AR_MEMBER_ATTR_DEFAULT;
}

static int slbt_ar_parse_primary_armap(
	const struct slbt_driver_ctx *  dctx,
	struct slbt_archive_meta_impl * m)

{
	struct ar_meta_member_info *    memberp;
	const char *                    hdrname;
	uint32_t                        hdrattr;

	memberp = m->memberv[0];
	hdrname = memberp->ar_file_header.ar_member_name;
	hdrattr = memberp->ar_file_header.ar_header_attr;

	if (!(memberp->ar_member_attr & AR_MEMBER_ATTR_ARMAP))
		return 0;

	if (hdrattr & AR_HEADER_ATTR_SYSV) {
		/* mips 64-bit armap member? */
		if (!strncmp(hdrname,"/SYM64/",7))
			return slbt_ar_parse_primary_armap_sysv_64(
				dctx,m);

		/* sysv 32-bit armap member */
		return slbt_ar_parse_primary_armap_sysv_32(
			dctx,m);

	} else if (hdrattr & AR_HEADER_ATTR_BSD) {
		if (!strcmp(hdrname,"__.SYMDEF"))
			return slbt_ar_parse_primary_armap_bsd_32(
				dctx,m);

		else if (!strcmp(hdrname,"__.SYMDEF SORTED"))
			return slbt_ar_parse_primary_armap_bsd_32(
				dctx,m);

		else if (!strcmp(hdrname,"__.SYMDEF_64"))
			return slbt_ar_parse_primary_armap_bsd_64(
				dctx,m);

		else if (!strcmp(hdrname,"__.SYMDEF_64 SORTED"))
			return slbt_ar_parse_primary_armap_bsd_64(
				dctx,m);
	}

	return SLBT_CUSTOM_ERROR(dctx,SLBT_ERR_FLOW_ERROR);
}

slbt_hidden struct ar_meta_member_info * slbt_archive_member_from_offset(
	struct slbt_archive_meta_impl * meta,
	off_t                           offset)
{
	intptr_t l,r,m;
	off_t *  offsetv;

	l = 0;
	r = meta->nentries - 1;

	offsetv = meta->offsetv;

	while (l != r) {
		m  = (l + r) / 2;
		m += (l + r) % 2;

		if (offsetv[m] > offset) {
			r = --m;
		} else {
			l = m;
		}
	}

	return (offsetv[l] == offset) ? meta->memberv[l] : 0;
}

int slbt_ar_get_archive_meta(
	const struct slbt_driver_ctx *  dctx,
	const struct slbt_raw_archive * archive,
	struct slbt_archive_meta **     meta)
{
	const char *                    mark;
	const char *                    cap;
	struct slbt_archive_meta_impl * m;
	const char *                    slash;
	const char *                    ch;
	const char *                    fldcap;
	size_t				nelements;
	uint64_t                        nentries;
	uint64_t                        nmembers;
	uint64_t                        stblsize;
	uint64_t                        filesize;
	uint64_t                        namelen;
	uint64_t                        nameoff;
	uint32_t			attr;
	void *                          s_addr;
	void *                          m_addr;
	const char *                    s_ptr;
	const char *                    m_ptr;
	struct ar_raw_file_header *	arhdr;
	struct ar_raw_file_header *	arlongnames;
	struct ar_meta_member_info *    memberp;
	char *				longnamep;
	size_t				idx;
	struct ar_meta_armap_ref_32 *   symrefs_32;
	struct ar_meta_armap_ref_64 *   symrefs_64;
	struct ar_header_info *		hdrinfov;
	struct ar_header_info *		hdrinfov_cap;
	struct ar_header_info *		hdrinfov_next;
	struct ar_header_info		hdrinfobuf[AR_STACK_VECTOR_ELEMENTS];

	/* init */
	hdrinfov     = hdrinfobuf;
	hdrinfov_cap = &hdrinfobuf[AR_STACK_VECTOR_ELEMENTS];
	nelements    = AR_STACK_VECTOR_ELEMENTS;

	memset(hdrinfobuf,0,sizeof(hdrinfobuf));

	mark = archive->map_addr;
	cap  = &mark[archive->map_size];

	/* preliminary validation */
	if (archive->map_size < sizeof(struct ar_raw_signature))
		return SLBT_CUSTOM_ERROR(
			dctx,
			SLBT_ERR_AR_INVALID_SIGNATURE);

	else if (strncmp(mark,ar_signature,sizeof(struct ar_raw_signature)))
		return SLBT_CUSTOM_ERROR(
			dctx,
			SLBT_ERR_AR_INVALID_SIGNATURE);

	/* alloc */
	if (!(m = calloc(1,sizeof(*m))))
		return SLBT_SYSTEM_ERROR(dctx,0);

	/* associated driver context */
	m->dctx = dctx;

	/* archive map info */
	m->armeta.r_archive.map_addr = archive->map_addr;
	m->armeta.r_archive.map_size = archive->map_size;

	/* archive signature */
	m->armeta.r_signature = (struct ar_raw_signature *)mark;
	m->armeta.m_signature = (struct ar_meta_signature *)ar_signature;

	/* signature only? */
	if (archive->map_size == sizeof(struct ar_raw_signature)) {
		*meta = &m->armeta;
		return 0;
	}

	mark += sizeof(struct ar_raw_signature);

	/* only trailing null characters past the signature? */
	if (cap < &mark[sizeof(*arhdr)])
		for (ch=mark; ch<cap; ch++)
			if (*ch)
				return slbt_ar_free_archive_meta_impl(
					m,SLBT_CUSTOM_ERROR(
						dctx,
						SLBT_ERR_AR_INVALID_HEADER));

	/* count entries, calculate string table size */
	for (nentries=0,stblsize=0,arlongnames=0; mark<cap; nentries++) {
		arhdr = (struct ar_raw_file_header *)mark;

		/* file size */
		if ((slbt_ar_read_decimal_64(
				arhdr->ar_file_size,
				sizeof(arhdr->ar_file_size),
				&filesize)) < 0)
			return slbt_ar_free_archive_meta_impl(
				m,SLBT_CUSTOM_ERROR(
					dctx,
					SLBT_ERR_AR_INVALID_HEADER));

		mark += sizeof(struct ar_raw_file_header);

		/* stblsize, member name type */
		fldcap = &arhdr->ar_file_id[sizeof(arhdr->ar_file_id)];

		/* sysv long names table? */
		if ((arhdr->ar_file_id[0] == '/') && (arhdr->ar_file_id[1] == '/')) {
			for (ch=&arhdr->ar_file_id[2]; ch<fldcap; ch++)
				if (*ch != AR_DEC_PADDING)
					return slbt_ar_free_archive_meta_impl(
						m,SLBT_CUSTOM_ERROR(
							dctx,
							SLBT_ERR_AR_INVALID_HEADER));

			if (slbt_ar_read_decimal_64(
					arhdr->ar_file_size,
					sizeof(arhdr->ar_file_size),
					&namelen) < 0)
				return slbt_ar_free_archive_meta_impl(
					m,SLBT_CUSTOM_ERROR(
						dctx,
						SLBT_ERR_AR_INVALID_HEADER));


			/* duplicate long names member? */
			if (arlongnames)
				return slbt_ar_free_archive_meta_impl(
					m,SLBT_CUSTOM_ERROR(
						dctx,
						SLBT_ERR_AR_DUPLICATE_LONG_NAMES));

			attr = AR_HEADER_ATTR_FILE_ID | AR_HEADER_ATTR_SYSV;

			stblsize++;
			stblsize++;
			stblsize++;

			stblsize += namelen;

			arlongnames = arhdr;

		/* the /SYM64/ string must be special cased, also below when it gets copied */
		} else if (!strncmp(arhdr->ar_file_id,"/SYM64/",7)) {
			for (ch=&arhdr->ar_file_id[7]; ch<fldcap; ch++)
				if (*ch != AR_DEC_PADDING)
					return slbt_ar_free_archive_meta_impl(
						m,SLBT_CUSTOM_ERROR(
							dctx,
							SLBT_ERR_AR_INVALID_HEADER));

			attr      = AR_HEADER_ATTR_FILE_ID | AR_HEADER_ATTR_SYSV;
			stblsize += 8;

		/* sysv armap member or sysv long name reference? */
		} else if (arhdr->ar_file_id[0] == '/') {
			if (slbt_ar_read_decimal_64(
					&arhdr->ar_file_id[1],
					sizeof(arhdr->ar_file_id)-1,
					&nameoff) < 0)
				return slbt_ar_free_archive_meta_impl(
					m,SLBT_CUSTOM_ERROR(
						dctx,
						SLBT_ERR_AR_INVALID_HEADER));

			if (arhdr->ar_file_id[1] == AR_DEC_PADDING) {
				attr = AR_HEADER_ATTR_FILE_ID | AR_HEADER_ATTR_SYSV;
				stblsize++;
				stblsize++;
			} else {
				attr = AR_HEADER_ATTR_NAME_REF | AR_HEADER_ATTR_SYSV;
			}

		/* bsd long name reference? */
		} else if ((arhdr->ar_file_id[0] == '#')
				&& (arhdr->ar_file_id[1] == '1')
				&& (arhdr->ar_file_id[2] == '/')) {
			if (slbt_ar_read_decimal_64(
					&arhdr->ar_file_id[3],
					sizeof(arhdr->ar_file_id)-3,
					&namelen) < 0)
				return slbt_ar_free_archive_meta_impl(
					m,SLBT_CUSTOM_ERROR(
						dctx,
						SLBT_ERR_AR_INVALID_HEADER));

			attr = AR_HEADER_ATTR_NAME_REF | AR_HEADER_ATTR_BSD;

			stblsize += namelen + 1;

		/* must be either a sysv short member name, or a (legacy) bsd short name */
		} else {
			for (ch=arhdr->ar_file_id,slash=0; (ch<fldcap) && !slash; ch++)
				if (*ch == '/')
					slash = ch;

			if (slash) {
				attr      = AR_HEADER_ATTR_FILE_ID | AR_HEADER_ATTR_SYSV;
				stblsize += (slash - arhdr->ar_file_id) + 1;
			} else {
				attr      = AR_HEADER_ATTR_FILE_ID | AR_HEADER_ATTR_BSD;
				stblsize += sizeof(arhdr->ar_file_id) + 1;
			}

			for (; ch<fldcap; )
				if (*ch++ != AR_DEC_PADDING)
					return slbt_ar_free_archive_meta_impl(
						m,SLBT_CUSTOM_ERROR(
							dctx,
							SLBT_ERR_AR_INVALID_HEADER));

		}

		/* truncated data? */
		if (cap < &mark[filesize])
			return slbt_ar_free_archive_meta_impl(
				m,SLBT_CUSTOM_ERROR(
					dctx,
					SLBT_ERR_AR_TRUNCATED_DATA));

		/* ar member alignment */
		filesize += 1;
		filesize |= 1;
		filesize ^= 1;

		mark += filesize;

		/* only trailing null characters past the signature? */
		if (cap < &mark[sizeof(*arhdr)])
			for (; mark<cap; )
				if (*mark++)
					return slbt_ar_free_archive_meta_impl(
						m,SLBT_CUSTOM_ERROR(
							dctx,
							SLBT_ERR_AR_INVALID_HEADER));

		/* transient header info vector */
		if (&hdrinfov[nentries] == hdrinfov_cap) {
			nelements = (nelements == AR_STACK_VECTOR_ELEMENTS)
				? (nelements << 4) : (nelements << 1);

			if (!(hdrinfov_next = calloc(nelements,sizeof(*hdrinfov))))
				return slbt_ar_free_archive_meta_impl(
					m,SLBT_CUSTOM_ERROR(
						dctx,
						SLBT_ERR_AR_TRUNCATED_DATA));

			for (idx=0; idx<nentries; idx++) {
				hdrinfov_next[idx].phdr = hdrinfov[idx].phdr;
				hdrinfov_next[idx].attr = hdrinfov[idx].attr;
			};

			if (hdrinfov != hdrinfobuf)
				free(hdrinfov);

			hdrinfov     = hdrinfov_next;
			hdrinfov_cap = &hdrinfov_next[nelements];
			m->hdrinfov  = hdrinfov;
		}

		hdrinfov[nentries].phdr = arhdr;
		hdrinfov[nentries].attr = attr;
	}

	/* allocate name strings, member vector */
	if (!(m->namestrs = calloc(1,stblsize)))
		return slbt_ar_free_archive_meta_impl(
			m,SLBT_SYSTEM_ERROR(dctx,0));

	if (!(m->offsetv = calloc(nentries+1,sizeof(*m->offsetv))))
		return slbt_ar_free_archive_meta_impl(
			m,SLBT_SYSTEM_ERROR(dctx,0));

	if (!(m->memberv = calloc(nentries+1,sizeof(*m->memberv))))
		return slbt_ar_free_archive_meta_impl(
			m,SLBT_SYSTEM_ERROR(dctx,0));

	if (!(m->members = calloc(nentries,sizeof(*m->members))))
		return slbt_ar_free_archive_meta_impl(
			m,SLBT_SYSTEM_ERROR(dctx,0));

	/* archive signature reference */
	s_addr = archive->map_addr;
	s_ptr  = s_addr;

	/* iterate, store meta data in library-friendly form */
	for (idx=0,longnamep=m->namestrs; idx<nentries; idx++) {
		arhdr           = hdrinfov[idx].phdr;
		attr            = hdrinfov[idx].attr;

		m_addr          = arhdr;
		m_ptr           = m_addr;

		memberp         = &m->members[idx];
		m->offsetv[idx] = m_ptr - s_ptr;
		m->memberv[idx] = memberp;

		memberp->ar_file_header.ar_header_attr = attr;

		slbt_ar_read_decimal_64(
			arhdr->ar_time_date_stamp,
			sizeof(arhdr->ar_time_date_stamp),
			&memberp->ar_file_header.ar_time_date_stamp);

		slbt_ar_read_decimal_32(
			arhdr->ar_uid,
			sizeof(arhdr->ar_uid),
			&memberp->ar_file_header.ar_uid);

		slbt_ar_read_decimal_32(
			arhdr->ar_gid,
			sizeof(arhdr->ar_gid),
			&memberp->ar_file_header.ar_gid);

		slbt_ar_read_octal(
			arhdr->ar_file_mode,
			sizeof(arhdr->ar_file_mode),
			&memberp->ar_file_header.ar_file_mode);

		slbt_ar_read_decimal_64(
			arhdr->ar_file_size,
			sizeof(arhdr->ar_file_size),
			&memberp->ar_file_header.ar_file_size);

		memberp->ar_file_header.ar_member_name = longnamep;

		if (attr == (AR_HEADER_ATTR_FILE_ID | AR_HEADER_ATTR_SYSV)) {
			if ((arhdr->ar_file_id[0] == '/') && (arhdr->ar_file_id[1] == '/')) {
				*longnamep++ = '/';
				*longnamep++ = '/';
				longnamep++;

			} else if ((arhdr->ar_file_id[0] == '/') && (arhdr->ar_file_id[1] == 'S')) {
				*longnamep++ = '/';
				*longnamep++ = 'S';
				*longnamep++ = 'Y';
				*longnamep++ = 'M';
				*longnamep++ = '6';
				*longnamep++ = '4';
				*longnamep++ = '/';
				longnamep++;

			} else if (arhdr->ar_file_id[0] == '/') {
				*longnamep++ = '/';
				longnamep++;

			} else {
				ch = arhdr->ar_file_id;

				for (; (*ch != '/'); )
					*longnamep++ = *ch++;

				longnamep++;
			}

		} else if (attr == (AR_HEADER_ATTR_FILE_ID | AR_HEADER_ATTR_BSD)) {
			ch     = arhdr->ar_file_id;
			fldcap = &ch[sizeof(arhdr->ar_file_id)];

			for (; (ch<fldcap) && (*ch != AR_DEC_PADDING); )
				*longnamep++ = *ch++;

			longnamep++;

		} else if (attr == (AR_HEADER_ATTR_NAME_REF | AR_HEADER_ATTR_SYSV)) {
			slbt_ar_read_decimal_64(
				&arhdr->ar_file_id[1],
				sizeof(arhdr->ar_file_id) - 1,
				&nameoff);

			ch  = arlongnames->ar_file_id;
			ch += sizeof(*arlongnames);
			ch += nameoff;

			for (; *ch && (*ch != '/') && (*ch != AR_OBJ_PADDING); )
				*longnamep++ = *ch++;

			longnamep++;

		} else if (attr == (AR_HEADER_ATTR_NAME_REF | AR_HEADER_ATTR_BSD)) {
			slbt_ar_read_decimal_64(
				&arhdr->ar_file_id[3],
				sizeof(arhdr->ar_file_id) - 3,
				&namelen);

			mark  = arhdr->ar_file_id;
			mark += sizeof(*arhdr);

			memcpy(longnamep,mark,namelen);

			longnamep += namelen;
			longnamep++;
		}

		/* member raw header, object size, object data */
		mark    = arhdr->ar_file_id;
		mark   += sizeof(*arhdr);
		namelen = 0;

		if (attr == (AR_HEADER_ATTR_NAME_REF | AR_HEADER_ATTR_BSD)) {
			slbt_ar_read_decimal_64(
				&arhdr->ar_file_id[3],
				sizeof(arhdr->ar_file_id)-3,
				&namelen);

			namelen += 1;
			namelen |= 1;
			namelen ^= 1;

			mark += namelen;
		};

		memberp->ar_member_data = arhdr;
		memberp->ar_object_data = (void *)mark;
		memberp->ar_object_size = memberp->ar_file_header.ar_file_size - namelen;

		/* member attribute */
		memberp->ar_member_attr = slbt_ar_get_member_attr(memberp);

		/* pe/coff second linker member? */
		if ((idx == 1) && (memberp->ar_member_attr == AR_MEMBER_ATTR_ARMAP))
			if (hdrinfov[0].attr & AR_HEADER_ATTR_SYSV)
				if (m->members[0].ar_member_attr == AR_MEMBER_ATTR_ARMAP)
					if (attr & AR_HEADER_ATTR_SYSV)
						memberp->ar_member_attr = AR_MEMBER_ATTR_LINKINFO;

		/* armap member must be the first */
		if ((memberp->ar_member_attr == AR_MEMBER_ATTR_ARMAP) && (idx > 0)) {
			if (m->members[0].ar_member_attr == AR_MEMBER_ATTR_ARMAP)
				return slbt_ar_free_archive_meta_impl(
					m,SLBT_CUSTOM_ERROR(
						dctx,
						SLBT_ERR_AR_DUPLICATE_ARMAP_MEMBER));

			return slbt_ar_free_archive_meta_impl(
				m,SLBT_CUSTOM_ERROR(
					dctx,
					SLBT_ERR_AR_MISPLACED_ARMAP_MEMBER));
		}
	}

	/* number of archive members, including internal ones */
	m->nentries = nentries;

	/* primary armap (first linker member) */
	if (slbt_ar_parse_primary_armap(dctx,m) < 0)
		return slbt_ar_free_archive_meta_impl(
			m,SLBT_NESTED_ERROR(dctx));

	for (idx=0,ch=m->symstrs; idx<m->armaps.armap_nsyms; idx++) {
		m->symstrv[idx] = ch;
		ch += strlen(ch);
		ch++;
	}

	if (m->armaps.armap_common_32.ar_member) {
		symrefs_32 = m->armaps.armap_symrefs_32;

		for (idx=0; idx<m->armaps.armap_nsyms; idx++) {
			if (m->armaps.armap_common_32.ar_armap_attr & AR_ARMAP_ATTR_SYSV)
				symrefs_32[idx].ar_name_offset = m->symstrv[idx] - m->symstrv[0];

			if (!slbt_archive_member_from_offset(m,symrefs_32[idx].ar_member_offset))
				return slbt_ar_free_archive_meta_impl(
					m,SLBT_CUSTOM_ERROR(
						dctx,
						SLBT_ERR_AR_INVALID_ARMAP_MEMBER_OFFSET));

			if (symrefs_32[idx].ar_name_offset) {
				ch = &m->symstrs[symrefs_32[idx].ar_name_offset];

				if ((ch > m->symstrv[m->armaps.armap_nsyms - 1]) || *--ch)
					return slbt_ar_free_archive_meta_impl(
						m,SLBT_CUSTOM_ERROR(
							dctx,
							SLBT_ERR_AR_INVALID_ARMAP_NAME_OFFSET));
			}

		}
	}

	if (m->armaps.armap_common_64.ar_member) {
		symrefs_64 = m->armaps.armap_symrefs_64;

		for (idx=0; idx<m->armaps.armap_nsyms; idx++) {
			if (m->armaps.armap_common_64.ar_armap_attr & AR_ARMAP_ATTR_SYSV)
				symrefs_64[idx].ar_name_offset = m->symstrv[idx] - m->symstrv[0];

			if (!slbt_archive_member_from_offset(m,symrefs_64[idx].ar_member_offset))
				return slbt_ar_free_archive_meta_impl(
					m,SLBT_CUSTOM_ERROR(
						dctx,
						SLBT_ERR_AR_INVALID_ARMAP_MEMBER_OFFSET));

			if (symrefs_64[idx].ar_name_offset) {
				ch = &m->symstrs[symrefs_64[idx].ar_name_offset];

				if ((ch > m->symstrv[m->armaps.armap_nsyms - 1]) || *--ch)
					return slbt_ar_free_archive_meta_impl(
						m,SLBT_CUSTOM_ERROR(
							dctx,
							SLBT_ERR_AR_INVALID_ARMAP_NAME_OFFSET));
			}

		}
	}

	/* number of public archive members */
	for (idx=0,nmembers=0; idx<nentries; idx++) {
		switch (m->memberv[idx]->ar_member_attr) {
			case AR_MEMBER_ATTR_ARMAP:
			case AR_MEMBER_ATTR_LINKINFO:
			case AR_MEMBER_ATTR_NAMESTRS:
				break;

			default:
				nmembers++;
		}
	}

	if (m->armaps.armap_common_32.ar_member)
		m->armaps.armap_common_32.ar_num_of_members = nmembers;

	if (m->armaps.armap_common_64.ar_member)
		m->armaps.armap_common_64.ar_num_of_members = nmembers;

	/* pe/coff armap attributes (second linker member) */
	(void)m->armeta.a_armap_pecoff;

	/* reference to the long names member */
	if (arlongnames)
		for (idx=0; idx<nentries && !m->armeta.a_arref_longnames; idx++)
			if (m->memberv[idx]->ar_member_data == arlongnames)
				m->armeta.a_arref_longnames = m->memberv[idx];

	/* common binary format (information only) */
	for (idx=0,nmembers=0; idx<nentries; idx++) {
		if (m->memberv[idx]->ar_member_attr == AR_MEMBER_ATTR_OBJECT) {
			if (m->ofmtattr && (m->ofmtattr != m->memberv[idx]->ar_object_attr)) {
				m->ofmtattr = 0;
				idx = nentries;
			} else if (!m->ofmtattr) {
				m->ofmtattr = m->memberv[idx]->ar_object_attr;
			}
		}
	}

	/* member vector */
	m->armeta.a_memberv = m->memberv;

	/* all done */
	if (m->hdrinfov) {
		free(m->hdrinfov);
		m->hdrinfov = 0;
	}

	*meta = &m->armeta;

	return 0;
}

void slbt_ar_free_archive_meta(struct slbt_archive_meta * meta)
{
	struct slbt_archive_meta_impl * m;

	if (meta) {
		m = slbt_archive_meta_ictx(meta);
		slbt_ar_free_archive_meta_impl(m,0);
	}
}