Blame src/arbits/slbt_armap_bsd_32.c

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/*******************************************************************/
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/*  slibtool: a skinny libtool implementation, written in C        */
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/*  Copyright (C) 2016--2024  SysDeer Technologies, LLC            */
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/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
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/*******************************************************************/
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#include <stdint.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <slibtool/slibtool.h>
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#include <slibtool/slibtool_arbits.h>
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#include "slibtool_ar_impl.h"
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#include "slibtool_driver_impl.h"
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#include "slibtool_errinfo_impl.h"
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int slbt_ar_parse_primary_armap_bsd_32(
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	const struct slbt_driver_ctx *  dctx,
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	struct slbt_archive_meta_impl * m)
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{
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	struct ar_raw_armap_bsd_32 *    armap;
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	struct ar_meta_member_info *    memberp;
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	struct ar_meta_armap_common_32 *armapref;
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	struct ar_meta_armap_ref_32 *   symrefs;
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	uint32_t                        idx;
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	uint32_t                        uref;
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	uint32_t                        attr;
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	uint32_t                        nsyms;
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	uint32_t                        nstrs;
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	uint32_t                        sizeofrefs_le;
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	uint32_t                        sizeofrefs_be;
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	uint32_t                        sizeofrefs;
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	uint32_t                        sizeofstrs;
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	const char *                    ch;
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	const char *                    cap;
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	unsigned char *                 uch;
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	unsigned char                   (*mark)[0x04];
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	armap   = &m->armaps.armap_bsd_32;
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	memberp = m->memberv[0];
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	mark = memberp->ar_object_data;
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	armap->ar_size_of_refs = mark;
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	uch = *mark++;
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	armap->ar_first_name_offset = mark;
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	sizeofrefs_le = (uch[3] << 24) + (uch[2] << 16) + (uch[1] << 8) + uch[0];
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	sizeofrefs_be = (uch[0] << 24) + (uch[1] << 16) + (uch[2] << 8) + uch[3];
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	if (sizeofrefs_le < memberp->ar_object_size - sizeof(*mark)) {
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		sizeofrefs = sizeofrefs_le;
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		attr       = AR_ARMAP_ATTR_LE_32;
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	} else if (sizeofrefs_be < memberp->ar_object_size - sizeof(*mark)) {
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		sizeofrefs = sizeofrefs_be;
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		attr       = AR_ARMAP_ATTR_BE_32;
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	} else {
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		return SLBT_CUSTOM_ERROR(
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			dctx,
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			SLBT_ERR_AR_INVALID_ARMAP_SIZE_OF_REFS);
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	}
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	nsyms  = sizeofrefs / sizeof(struct ar_raw_armap_ref_32);
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	mark  += (sizeofrefs / sizeof(*mark));
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	armap->ar_size_of_strs = mark;
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	uch = *mark++;
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	sizeofstrs = (attr == AR_ARMAP_ATTR_LE_32)
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		? (uch[3] << 24) + (uch[2] << 16) + (uch[1] << 8) + uch[0]
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		: (uch[0] << 24) + (uch[1] << 16) + (uch[2] << 8) + uch[3];
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	if (sizeofstrs > memberp->ar_object_size - 2*sizeof(*mark) - sizeofrefs)
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		return SLBT_CUSTOM_ERROR(
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			dctx,
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			SLBT_ERR_AR_INVALID_ARMAP_SIZE_OF_STRS);
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	m->symstrs = (const char *)mark;
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	cap  = m->symstrs;
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	cap += sizeofstrs;
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	if ((cap == m->symstrs) && nsyms)
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		return SLBT_CUSTOM_ERROR(
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			dctx,
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			SLBT_ERR_AR_INVALID_ARMAP_STRING_TABLE);
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	if (nsyms && !m->symstrs[0])
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		return SLBT_CUSTOM_ERROR(
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			dctx,
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			SLBT_ERR_AR_INVALID_ARMAP_STRING_TABLE);
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	for (ch=&m->symstrs[1],nstrs=0; ch
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		if (!ch[0] && !ch[-1] && (nstrs < nsyms))
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			return SLBT_CUSTOM_ERROR(
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				dctx,
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				SLBT_ERR_AR_INVALID_ARMAP_STRING_TABLE);
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		if (!ch[0] && ch[-1] && (nstrs < nsyms))
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			nstrs++;
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	}
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	if (nstrs != nsyms)
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		return SLBT_CUSTOM_ERROR(
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			dctx,
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			SLBT_ERR_AR_INVALID_ARMAP_STRING_TABLE);
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	if (!(m->symstrv = calloc(nsyms + 1,sizeof(const char *))))
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		return SLBT_SYSTEM_ERROR(dctx,0);
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	if (!(m->armaps.armap_symrefs_32 = calloc(nsyms + 1,sizeof(*symrefs))))
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		return SLBT_SYSTEM_ERROR(dctx,0);
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	mark    = armap->ar_first_name_offset;
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	symrefs = m->armaps.armap_symrefs_32;
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	for (idx=0,uch=*++mark; idx
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		uref = (attr == AR_ARMAP_ATTR_BE_32)
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			? (uch[0] << 24) + (uch[1] << 16) + (uch[2] << 8) + uch[3]
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			: (uch[3] << 24) + (uch[2] << 16) + (uch[1] << 8) + uch[0];
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		symrefs[idx].ar_member_offset = uref;
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		mark++;
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	}
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	armap->ar_string_table = m->symstrv;
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	armapref = &m->armaps.armap_common_32;
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	armapref->ar_member         = memberp;
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	armapref->ar_symrefs        = symrefs;
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	armapref->ar_armap_bsd      = armap;
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	armapref->ar_armap_attr     = AR_ARMAP_ATTR_BSD | attr;
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	armapref->ar_num_of_symbols = nsyms;
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	armapref->ar_size_of_refs   = sizeofrefs;
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	armapref->ar_size_of_strs   = sizeofstrs;
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	armapref->ar_string_table   = m->symstrs;
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	m->armaps.armap_nsyms = nsyms;
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	m->armeta.a_armap_primary.ar_armap_common_32 = armapref;
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	return 0;
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}