Blame src/arbits/slbt_archive_ctx.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 <sys/mman.h>
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#include <slibtool/slibtool.h>
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#include "slibtool_driver_impl.h"
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#include "slibtool_errinfo_impl.h"
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static int slbt_map_raw_archive(
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	const struct slbt_driver_ctx *	dctx,
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	int				fd,
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	const char *			path,
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	int				prot,
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	struct slbt_raw_archive *	map)
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{
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	struct slbt_input mapinfo = {0,0};
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	if (slbt_map_input(dctx,fd,path,prot,&mapinfo) < 0)
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		return SLBT_NESTED_ERROR(dctx);
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	if (mapinfo.size == 0)
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		return SLBT_CUSTOM_ERROR(
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			dctx,
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			SLBT_ERR_AR_EMPTY_FILE);
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	map->map_addr = mapinfo.addr;
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	map->map_size = mapinfo.size;
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	return 0;
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}
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static int slbt_unmap_raw_archive(struct slbt_raw_archive * map)
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{
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	struct slbt_input mapinfo;
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	mapinfo.addr = map->map_addr;
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	mapinfo.size = map->map_size;
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	return slbt_unmap_input(&mapinfo);
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}
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static int slbt_free_archive_ctx_impl(struct slbt_archive_ctx_impl * ctx, int ret)
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{
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	if (ctx) {
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		slbt_free_archive_meta(ctx->meta);
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		slbt_unmap_raw_archive(&ctx->map);
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		free(ctx);
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	}
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	return ret;
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}
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int slbt_get_archive_ctx(
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	const struct slbt_driver_ctx *	dctx,
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	const char *			path,
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	struct slbt_archive_ctx **		pctx)
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{
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	struct slbt_archive_ctx_impl *	ctx;
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	int				prot;
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	if (!(ctx = calloc(1,sizeof(*ctx))))
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		return SLBT_BUFFER_ERROR(dctx);
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	slbt_driver_set_arctx(
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		dctx,0,path);
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	prot = (dctx->cctx->actflags & SLBT_ACTION_MAP_READWRITE)
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		? PROT_READ | PROT_WRITE
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		: PROT_READ;
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	if (slbt_map_raw_archive(dctx,-1,path,prot,&ctx->map))
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		return slbt_free_archive_ctx_impl(ctx,
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			SLBT_NESTED_ERROR(dctx));
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	if (slbt_get_archive_meta(dctx,&ctx->map,&ctx->meta))
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		return slbt_free_archive_ctx_impl(ctx,
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			SLBT_NESTED_ERROR(dctx));
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	ctx->dctx       = dctx;
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	ctx->path	= path;
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	ctx->actx.path	= &ctx->path;
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	ctx->actx.map	= &ctx->map;
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	ctx->actx.meta	= ctx->meta;
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	*pctx = &ctx->actx;
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	return 0;
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}
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void slbt_free_archive_ctx(struct slbt_archive_ctx * ctx)
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{
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	struct slbt_archive_ctx_impl *	ictx;
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	uintptr_t			addr;
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	if (ctx) {
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		addr = (uintptr_t)ctx - offsetof(struct slbt_archive_ctx_impl,actx);
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		ictx = (struct slbt_archive_ctx_impl *)addr;
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		slbt_free_archive_ctx_impl(ictx,0);
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	}
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}