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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-09-13 13:37:42 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-09-16 09:34:35 +0200
commitf757737060d4daebb24a32e90d912661428708a8 (patch)
treea6e96145d4fc540e435c13a69c924329db2edb6d /lib/common/io_stdin.c
parentc1a2cb729bd5bb5fdadf00cb3968bbc541f79750 (diff)
Remodel libtar/tar2sqfs to read data from an istream_t
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/common/io_stdin.c')
-rw-r--r--lib/common/io_stdin.c182
1 files changed, 0 insertions, 182 deletions
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;
-}