/****************************************************************/

/*  mdso: midipix dso scavenger                                 */

/*  Copyright (C) 2015--2024  SysDeer Technologies, LLC         */

/*  Released under GPLv2 and GPLv3; see COPYING.MDSO.           */

/****************************************************************/

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/mman.h>

#include <mdso/mdso.h>

#include "mdso_object_impl.h"

#include "mdso_errinfo_impl.h"

#include "perk_structs.h"

static void mdso_obj_write_objname(char * ch, off_t objidx)

{

	ch[0] = 's';

	ch[6] = (objidx % 10) + '0'; objidx /= 10;

	ch[5] = (objidx % 10) + '0'; objidx /= 10;

	ch[4] = (objidx % 10) + '0'; objidx /= 10;

	ch[3] = (objidx % 10) + '0'; objidx /= 10;

	ch[2] = (objidx % 10) + '0'; objidx /= 10;

	ch[1] = (objidx % 10) + '0'; objidx /= 10;

	ch[7] = '.';

	ch[8] = 'o';

}

static void mdso_argen_common_hdr(

	struct pe_raw_archive_common_hdr *	arhdr,

	char *					file_id,

	size_t					size)

{

	size_t	slen;

	memset(arhdr,0x20,sizeof(*arhdr));

	slen = strlen(file_id);

	memcpy(arhdr->ar_file_id,file_id,slen);

	arhdr->ar_file_id[slen] = '/';

	arhdr->ar_uid[0] = '0';

	arhdr->ar_gid[0] = '0';

	arhdr->ar_file_mode[0] = '0';

	arhdr->ar_time_date_stamp[0] = '0';

	mdso_obj_write_dec(arhdr->ar_file_size,size);

	arhdr->ar_end_tag[0] = 0x60;

	arhdr->ar_end_tag[1] = 0x0a;

}

static void mdso_write_big_endian_long(unsigned char * ch, uint32_t val)

{

	ch[3] = val;

	ch[2] = val >> 8;

	ch[1] = val >> 16;

	ch[0] = val >> 24;

}

int  mdso_argen_common(

	const struct mdso_driver_ctx *	dctx,

	const char **			symv,

	struct mdso_object *		vobj)

{

	int					ret;

	const char **				psym;

	intptr_t				nobj;

	uint32_t				objlen;

	uint32_t				hdrlen;

	uint32_t				mapstrsnum;

	uint32_t				mapstrslen;

	uint32_t				symidx;

	void *					addr;

	unsigned char *				ar;

	unsigned char *				mark;

	unsigned char *				idx;

	char *					mapstrs;

	struct pe_raw_archive_common_hdr *	arhdr;

	struct mdso_object *			pobj;

	struct mdso_object *			aobj;

	struct mdso_object			sobj[256];

	char					objname[16];

	/* init */

	memset(sobj,0,sizeof(sobj));

	for (psym=symv; *psym; psym++)

		(void)0;

	if ((nobj = psym - symv) < 255)

		aobj = sobj;

	else if (nobj > 1024*1024)

		return MDSO_CUSTOM_ERROR(dctx,MDSO_ERR_INVALID_VECTOR);

	else if (!(aobj = calloc(1,++nobj*sizeof(*aobj))))

		return MDSO_SYSTEM_ERROR(dctx);

	/* objlen: archive signature, index header */

	objlen  = 8;

	objlen += sizeof(struct pe_raw_archive_common_hdr);

	/* objlen: member headers */

	ret = mdso_objgen_dsometa(dctx,aobj);

	aobj->size += 1;

	aobj->size |= 1;

	aobj->size ^= 1;

	objlen += aobj->size;

	objlen += sizeof(struct pe_raw_archive_common_hdr);

	mapstrslen = aobj->mapstrslen;

	mapstrsnum = aobj->mapstrsnum;

	/* objlen: symentry */

	for (psym=symv,pobj=&aobj[1]; *psym && !ret; psym++) {

		ret = mdso_objgen_symentry(dctx,*psym,pobj);

		pobj->size += 1;

		pobj->size |= 1;

		pobj->size ^= 1;

		objlen += pobj->size;

		objlen += sizeof(struct pe_raw_archive_common_hdr);

		mapstrslen += pobj->mapstrslen;

		mapstrsnum += pobj->mapstrsnum;

		pobj++;

	}

	/* verify logic */

	if (ret && (aobj == sobj))

		return MDSO_NESTED_ERROR(dctx);

	if (ret) {

		free(aobj);

		return MDSO_NESTED_ERROR(dctx);

	}

	/* index: string block alignment */

	mapstrslen += 1;

	mapstrslen |= 1;

	mapstrslen ^= 1;

	/* objlen: index size, padding */

	objlen += sizeof(uint32_t) * (1 + mapstrsnum);

	objlen += mapstrslen;

	/* archive meta info, in-memory mapping */

	if (vobj->addr && (vobj->size < objlen))

		return MDSO_BUFFER_ERROR(dctx);

	if ((addr = vobj->addr)) {

		(void)0;

	} else {

		vobj->size       = objlen;

		vobj->mapstrslen = mapstrslen;

		vobj->mapstrsnum = mapstrsnum;

		if (!vobj->name)

			return 0;

		else if (mdso_create_archive(dctx,vobj) < 0)

			return MDSO_NESTED_ERROR(dctx);

	}

	ar = (unsigned char *)vobj->addr;

	/* archive signature */

	memcpy(ar,"!<arch>\n",8);

	mark = &ar[8];

	/* archive header */

	arhdr  = (struct pe_raw_archive_common_hdr *)mark;

	hdrlen = sizeof(uint32_t) * (1 + mapstrsnum) + mapstrslen;

	mdso_argen_common_hdr(arhdr,"",hdrlen);

	mark += sizeof(*arhdr);

	/* archive index initialization */

	mdso_write_big_endian_long(mark,mapstrsnum);

	mark += sizeof(uint32_t);

	idx   = mark;

	mark += sizeof(uint32_t) * mapstrsnum;

	mapstrs = (char *)mark;

	mark   += mapstrslen;

	/* .dsometa object */

	aobj->mapstrs  = mapstrs;

	aobj->arhdrpos = (uint32_t)(mark - ar);

	aobj->arhdrlen = sizeof(struct pe_raw_archive_common_hdr);

	aobj->addr     = &mark[aobj->arhdrlen];

	for (symidx=0; symidx<aobj->mapstrsnum; symidx++) {

		mdso_write_big_endian_long(idx,aobj->arhdrpos);

		idx += sizeof(uint32_t);

	}

	ret = mdso_objgen_dsometa(dctx,aobj);

	mdso_argen_common_hdr(

		(struct pe_raw_archive_common_hdr *)mark,

		".dsometa.o",aobj->size);

	mark    += aobj->arhdrlen + aobj->size;

	mapstrs += aobj->mapstrslen;

	/* archive symentry objects */

	for (psym=symv,pobj=&aobj[1]; *psym && !ret; psym++) {

		/* symentry object */

		pobj->mapstrs  = mapstrs;

		pobj->arhdrpos = (uint32_t)(mark - ar);

		pobj->arhdrlen = sizeof(struct pe_raw_archive_common_hdr);

		pobj->addr     = &mark[pobj->arhdrlen];

		for (symidx=0; symidx<pobj->mapstrsnum; symidx++) {

			mdso_write_big_endian_long(idx,pobj->arhdrpos);

			idx += sizeof(uint32_t);

		}

		mdso_obj_write_objname(objname,psym - symv);

		ret = mdso_objgen_symentry(dctx,*psym,pobj);

		mdso_argen_common_hdr(

			(struct pe_raw_archive_common_hdr *)mark,

			objname,pobj->size);

		mark    += pobj->arhdrlen + pobj->size;

		mapstrs += pobj->mapstrslen;

		pobj++;

	}

	/* aobj */

	if (aobj != sobj)

		free(aobj);

	/* fs object unmap */

	if (!addr)

		munmap(vobj->addr,vobj->size);

	/* verify */

	if (ret)

		return MDSO_NESTED_ERROR(dctx);

	/* tada */

	return 0;

}