From f757737060d4daebb24a32e90d912661428708a8 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Date: Sun, 13 Sep 2020 13:37:42 +0200
Subject: Remodel libtar/tar2sqfs to read data from an istream_t

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
 lib/common/io_stdin.c | 182 --------------------------------------------------
 1 file changed, 182 deletions(-)
 delete mode 100644 lib/common/io_stdin.c

(limited to 'lib/common/io_stdin.c')

diff --git a/lib/common/io_stdin.c b/lib/common/io_stdin.c
deleted file mode 100644
index 4694989..0000000
--- a/lib/common/io_stdin.c
+++ /dev/null
@@ -1,182 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * io_stdin.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "common.h"
-
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-
-
-typedef struct {
-	sqfs_file_t base;
-
-	const sparse_map_t *map;
-	sqfs_u64 offset;
-	sqfs_u64 real_size;
-	sqfs_u64 apparent_size;
-	FILE *fp;
-} sqfs_file_stdinout_t;
-
-
-static void stdinout_destroy(sqfs_object_t *base)
-{
-	free(base);
-}
-
-static sqfs_u64 stdinout_get_size(const sqfs_file_t *base)
-{
-	return ((const sqfs_file_stdinout_t *)base)->apparent_size;
-}
-
-static int stdinout_truncate(sqfs_file_t *base, sqfs_u64 size)
-{
-	(void)base; (void)size;
-	return SQFS_ERROR_IO;
-}
-
-static int stdin_read_at(sqfs_file_t *base, sqfs_u64 offset,
-			 void *buffer, size_t size)
-{
-	sqfs_file_stdinout_t *file = (sqfs_file_stdinout_t *)base;
-	size_t temp_size = 0;
-	sqfs_u8 *temp = NULL;
-	sqfs_u64 diff;
-	size_t ret;
-
-	if (offset < file->offset)
-		return SQFS_ERROR_IO;
-
-	if (offset > file->offset) {
-		temp_size = 1024;
-		temp = alloca(temp_size);
-	}
-
-	if (offset >= file->real_size || (offset + size) > file->real_size)
-		return SQFS_ERROR_OUT_OF_BOUNDS;
-
-	while (size > 0) {
-		if (ferror(file->fp))
-			return SQFS_ERROR_IO;
-
-		if (feof(file->fp))
-			return SQFS_ERROR_OUT_OF_BOUNDS;
-
-		if (offset > file->offset) {
-			diff = file->offset - offset;
-			diff = diff > (sqfs_u64)temp_size ? temp_size : diff;
-
-			ret = fread(temp, 1, diff, file->fp);
-		} else {
-			ret = fread(buffer, 1, size, file->fp);
-		}
-
-		if (offset <= file->offset) {
-			buffer = (char *)buffer + ret;
-			size -= ret;
-			offset += ret;
-		}
-
-		file->offset += ret;
-	}
-
-	return 0;
-}
-
-static int stdin_read_condensed(sqfs_file_t *base, sqfs_u64 offset,
-				void *buffer, size_t size)
-{
-	sqfs_file_stdinout_t *file = (sqfs_file_stdinout_t *)base;
-	sqfs_u64 poffset = 0, src_start;
-	size_t dst_start, diff, count;
-	const sparse_map_t *it;
-	int err;
-
-	memset(buffer, 0, size);
-
-	for (it = file->map; it != NULL; it = it->next) {
-		if (it->offset + it->count <= offset) {
-			poffset += it->count;
-			continue;
-		}
-
-		if (it->offset >= offset + size) {
-			poffset += it->count;
-			continue;
-		}
-
-		count = size;
-
-		if (offset + count >= it->offset + it->count)
-			count = it->offset + it->count - offset;
-
-		if (it->offset < offset) {
-			diff = offset - it->offset;
-
-			src_start = poffset + diff;
-			dst_start = 0;
-			count -= diff;
-		} else if (it->offset > offset) {
-			diff = it->offset - offset;
-
-			src_start = poffset;
-			dst_start = diff;
-		} else {
-			src_start = poffset;
-			dst_start = 0;
-		}
-
-		err = stdin_read_at(base, src_start,
-				    (char *)buffer + dst_start, count);
-		if (err)
-			return err;
-
-		poffset += it->count;
-	}
-
-	return 0;
-}
-
-static int stdin_write_at(sqfs_file_t *base, sqfs_u64 offset,
-			  const void *buffer, size_t size)
-{
-	(void)base; (void)offset; (void)buffer; (void)size;
-	return SQFS_ERROR_IO;
-}
-
-sqfs_file_t *sqfs_get_stdin_file(FILE *fp, const sparse_map_t *map,
-				 sqfs_u64 size)
-{
-	sqfs_file_stdinout_t *file = calloc(1, sizeof(*file));
-	sqfs_file_t *base = (sqfs_file_t *)file;
-	const sparse_map_t *it;
-
-	if (file == NULL)
-		return NULL;
-
-	file->apparent_size = size;
-	file->map = map;
-	file->fp = fp;
-
-	if (map != NULL) {
-		for (it = map; it != NULL; it = it->next)
-			file->real_size += map->count;
-	} else {
-		file->real_size = size;
-	}
-
-	((sqfs_object_t *)base)->destroy = stdinout_destroy;
-	base->write_at = stdin_write_at;
-	base->get_size = stdinout_get_size;
-	base->truncate = stdinout_truncate;
-
-	if (map == NULL) {
-		base->read_at = stdin_read_at;
-	} else {
-		base->read_at = stdin_read_condensed;
-	}
-	return base;
-}
-- 
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