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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* istream.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "../internal.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
typedef struct {
istream_t base;
char *path;
HANDLE hnd;
bool eof;
size_t buffer_offset;
size_t buffer_used;
sqfs_u8 buffer[BUFSZ];
} file_istream_t;
static int precache(istream_t *strm)
{
file_istream_t *file = (file_istream_t *)strm;
DWORD diff, actual;
HANDLE hnd;
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;
hnd = file->path == NULL ? GetStdHandle(STD_INPUT_HANDLE) : file->hnd;
while (file->buffer_used < sizeof(file->buffer)) {
diff = sizeof(file->buffer) - file->buffer_used;
if (!ReadFile(hnd, file->buffer + file->buffer_used,
diff, &actual, NULL)) {
DWORD error = GetLastError();
if (error == ERROR_HANDLE_EOF ||
error == ERROR_BROKEN_PIPE) {
file->eof = true;
break;
}
SetLastError(error);
w32_perror(file->path == NULL ? "stdin" : file->path);
return -1;
}
if (actual == 0) {
file->eof = true;
break;
}
file->buffer_used += actual;
}
return 0;
}
static int file_get_buffered_data(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(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(istream_t *strm)
{
file_istream_t *file = (file_istream_t *)strm;
return file->path == NULL ? "stdin" : file->path;
}
static void file_destroy(sqfs_object_t *obj)
{
file_istream_t *file = (file_istream_t *)obj;
if (file->path != NULL) {
CloseHandle(file->hnd);
free(file->path);
}
free(file);
}
istream_t *istream_open_file(const char *path)
{
file_istream_t *file = calloc(1, sizeof(*file));
istream_t *strm = (istream_t *)file;
WCHAR *wpath = NULL;
if (file == NULL) {
perror(path);
return NULL;
}
sqfs_object_init(file, file_destroy, NULL);
wpath = path_to_windows(path);
if (wpath == NULL)
goto fail_free;
file->path = strdup(path);
if (file->path == NULL) {
perror(path);
goto fail_free;
}
file->hnd = CreateFileW(wpath, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (file->hnd == INVALID_HANDLE_VALUE) {
perror(path);
goto fail_path;
}
free(wpath);
strm->buffer = file->buffer;
strm->get_buffered_data = file_get_buffered_data;
strm->advance_buffer = file_advance_buffer;
strm->get_filename = file_get_filename;
return strm;
fail_path:
free(file->path);
fail_free:
free(wpath);
free(file);
return NULL;
}
istream_t *istream_open_stdin(void)
{
file_istream_t *file = calloc(1, sizeof(*file));
istream_t *strm = (istream_t *)file;
if (file == NULL) {
perror("stdin");
return NULL;
}
sqfs_object_init(file, file_destroy, NULL);
strm->buffer = file->buffer;
strm->get_buffered_data = file_get_buffered_data;
strm->advance_buffer = file_advance_buffer;
strm->get_filename = file_get_filename;
return strm;
}
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