diff options
Diffstat (limited to 'lib/sqfs/src/unix/istream.c')
-rw-r--r-- | lib/sqfs/src/unix/istream.c | 180 |
1 files changed, 0 insertions, 180 deletions
diff --git a/lib/sqfs/src/unix/istream.c b/lib/sqfs/src/unix/istream.c deleted file mode 100644 index a0a3469..0000000 --- a/lib/sqfs/src/unix/istream.c +++ /dev/null @@ -1,180 +0,0 @@ -/* SPDX-License-Identifier: LGPL-3.0-or-later */ -/* - * istream.c - * - * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at> - */ -#define SQFS_BUILDING_DLL -#include "config.h" - -#include "sqfs/io.h" -#include "sqfs/error.h" - -#include <stdlib.h> -#include <unistd.h> -#include <string.h> -#include <assert.h> -#include <errno.h> -#include <fcntl.h> - -#define BUFSZ (131072) - -typedef struct { - sqfs_istream_t base; - char *path; - int fd; - - bool eof; - size_t buffer_offset; - size_t buffer_used; - sqfs_u8 buffer[BUFSZ]; -} file_istream_t; - -static int precache(sqfs_istream_t *strm) -{ - file_istream_t *file = (file_istream_t *)strm; - - if (file->eof) - return 0; - - if (file->buffer_offset > 0 && - file->buffer_offset < file->buffer_used) { - memmove(file->buffer, file->buffer + file->buffer_offset, - file->buffer_used - file->buffer_offset); - } - - file->buffer_used -= file->buffer_offset; - file->buffer_offset = 0; - - while (file->buffer_used < BUFSZ) { - ssize_t ret = read(file->fd, file->buffer + file->buffer_used, - BUFSZ - file->buffer_used); - - if (ret == 0) { - file->eof = true; - break; - } - - if (ret < 0) { - if (errno == EINTR) - continue; - return SQFS_ERROR_IO; - } - - file->buffer_used += ret; - } - - return 0; -} - -static int file_get_buffered_data(sqfs_istream_t *strm, const sqfs_u8 **out, - size_t *size, size_t want) -{ - file_istream_t *file = (file_istream_t *)strm; - - if (want > BUFSZ) - want = BUFSZ; - - if (file->buffer_used == 0 || - (file->buffer_used - file->buffer_offset) < want) { - int ret = precache(strm); - if (ret) - return ret; - } - - *out = file->buffer + file->buffer_offset; - *size = file->buffer_used - file->buffer_offset; - return (file->eof && *size == 0) ? 1 : 0; -} - -static void file_advance_buffer(sqfs_istream_t *strm, size_t count) -{ - file_istream_t *file = (file_istream_t *)strm; - - assert(count <= file->buffer_used); - - file->buffer_offset += count; - - assert(file->buffer_offset <= file->buffer_used); -} - -static const char *file_get_filename(sqfs_istream_t *strm) -{ - return ((file_istream_t *)strm)->path; -} - -static void file_destroy(sqfs_object_t *obj) -{ - file_istream_t *file = (file_istream_t *)obj; - - close(file->fd); - free(file->path); - free(file); -} - -int sqfs_istream_open_handle(sqfs_istream_t **out, const char *path, - sqfs_file_handle_t fd, sqfs_u32 flags) -{ - file_istream_t *file; - sqfs_istream_t *strm; - - if (flags & ~(SQFS_FILE_OPEN_ALL_FLAGS)) - return SQFS_ERROR_UNSUPPORTED; - - file = calloc(1, sizeof(*file)); - strm = (sqfs_istream_t *)file; - if (file == NULL) - return SQFS_ERROR_ALLOC; - - sqfs_object_init(file, file_destroy, NULL); - - file->path = strdup(path); - if (file->path == NULL) { - int temp = errno; - free(file); - errno = temp; - return SQFS_ERROR_ALLOC; - } - - file->fd = dup(fd); - if (file->fd < 0) { - int temp = errno; - free(file->path); - free(file); - errno = temp; - return SQFS_ERROR_IO; - } - close(fd); - - strm->get_buffered_data = file_get_buffered_data; - strm->advance_buffer = file_advance_buffer; - strm->get_filename = file_get_filename; - - *out = strm; - return 0; -} - -int sqfs_istream_open_file(sqfs_istream_t **out, const char *path, - sqfs_u32 flags) -{ - sqfs_file_handle_t fd; - int ret; - - flags |= SQFS_FILE_OPEN_READ_ONLY; - - if (flags & (SQFS_FILE_OPEN_OVERWRITE | SQFS_FILE_OPEN_NO_SPARSE)) - return SQFS_ERROR_ARG_INVALID; - - ret = sqfs_open_native_file(&fd, path, flags); - if (ret) - return ret; - - ret = sqfs_istream_open_handle(out, path, fd, flags); - if (ret != 0) { - int temp = errno; - close(fd); - errno = temp; - } - - return ret; -} |