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/* 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 "compat.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#if defined(_WIN32) || defined(__WINDOWS__)
static SSIZE_T read(HANDLE fd, void *ptr, size_t size)
{
DWORD ret;
if (!ReadFile(fd, ptr, size, &ret, NULL)) {
os_error_t error = get_os_error_state();
set_os_error_state(error);
if (error.w32_errno == ERROR_HANDLE_EOF ||
error.w32_errno == ERROR_BROKEN_PIPE) {
return 0;
}
return -1;
}
return ret;
}
#endif
#define BUFSZ (131072)
typedef struct {
sqfs_istream_t base;
char *path;
sqfs_file_handle_t 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 !defined(_WIN32) && !defined(__WINDOWS__)
if (errno == EINTR)
continue;
#endif
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;
if (count < (file->buffer_used - file->buffer_offset)) {
file->buffer_offset += count;
} else {
file->buffer_offset = 0;
file->buffer_used = 0;
}
}
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;
sqfs_native_file_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;
int ret;
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) {
os_error_t err = get_os_error_state();
free(file);
set_os_error_state(err);
return SQFS_ERROR_ALLOC;
}
ret = sqfs_native_file_duplicate(fd, &file->fd);
if (ret) {
os_error_t err = get_os_error_state();
free(file->path);
free(file);
set_os_error_state(err);
return ret;
}
sqfs_native_file_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_native_file_open(&fd, path, flags);
if (ret)
return ret;
ret = sqfs_istream_open_handle(out, path, fd, flags);
if (ret != 0) {
os_error_t err = get_os_error_state();
sqfs_native_file_close(fd);
set_os_error_state(err);
}
return ret;
}
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