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Merge pull request #27589 from Chaosus/fix_file

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Fix File switching between reading and writing, opened with READ_WRITE on Windows
This commit is contained in:
Rémi Verschelde 2019-04-08 12:12:19 +02:00 committed by GitHub
parent 7f3373d79f 8d12dfa24d
commit d65cbddc8d
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 34 additions and 0 deletions
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33
drivers/windows/file_access_windows.cpp
View file

@ -197,12 +197,14 @@ void FileAccessWindows::seek(size_t p_position) {
last_error = OK;
if (fseek(f, p_position, SEEK_SET))
check_errors();
prev_op = 0;
}
void FileAccessWindows::seek_end(int64_t p_position) {
ERR_FAIL_COND(!f);
if (fseek(f, p_position, SEEK_END))
check_errors();
prev_op = 0;
}
size_t FileAccessWindows::get_position() const {
@ -234,6 +236,12 @@ bool FileAccessWindows::eof_reached() const {
uint8_t FileAccessWindows::get_8() const {
ERR_FAIL_COND_V(!f, 0);
if (flags == READ_WRITE || flags == WRITE_READ) {
if (prev_op == WRITE) {
fflush(f);
}
prev_op = READ;
}
uint8_t b;
if (fread(&b, 1, 1, f) == 0) {
check_errors();
@ -246,6 +254,12 @@ uint8_t FileAccessWindows::get_8() const {
int FileAccessWindows::get_buffer(uint8_t *p_dst, int p_length) const {
ERR_FAIL_COND_V(!f, -1);
if (flags == READ_WRITE || flags == WRITE_READ) {
if (prev_op == WRITE) {
fflush(f);
}
prev_op = READ;
}
int read = fread(p_dst, 1, p_length, f);
check_errors();
return read;
@ -260,16 +274,34 @@ void FileAccessWindows::flush() {
ERR_FAIL_COND(!f);
fflush(f);
if (prev_op == WRITE)
prev_op = 0;
}
void FileAccessWindows::store_8(uint8_t p_dest) {
ERR_FAIL_COND(!f);
if (flags == READ_WRITE || flags == WRITE_READ) {
if (prev_op == READ) {
if (last_error != ERR_FILE_EOF) {
fseek(f, 0, SEEK_CUR);
}
}
prev_op = WRITE;
}
fwrite(&p_dest, 1, 1, f);
}
void FileAccessWindows::store_buffer(const uint8_t *p_src, int p_length) {
ERR_FAIL_COND(!f);
if (flags == READ_WRITE || flags == WRITE_READ) {
if (prev_op == READ) {
if (last_error != ERR_FILE_EOF) {
fseek(f, 0, SEEK_CUR);
}
}
prev_op = WRITE;
}
ERR_FAIL_COND(fwrite(p_src, 1, p_length, f) != p_length);
}
@ -310,6 +342,7 @@ uint64_t FileAccessWindows::_get_modified_time(const String &p_file) {
FileAccessWindows::FileAccessWindows() :
f(NULL),
flags(0),
prev_op(0),
last_error(OK) {
}
FileAccessWindows::~FileAccessWindows() {

1
drivers/windows/file_access_windows.h
View file

@ -47,6 +47,7 @@ class FileAccessWindows : public FileAccess {
FILE *f;
int flags;
void check_errors() const;
mutable int prev_op;
mutable Error last_error;
String path;
String path_src;