Magisk/native/jni/utils/stream.cpp
2019-11-23 04:57:52 -05:00

125 lines
2.6 KiB
C++

#include <utils.h>
#include <logging.h>
#include <stream.h>
static int strm_read(void *v, char *buf, int len) {
auto strm = reinterpret_cast<stream *>(v);
return strm->read(buf, len);
}
static int strm_write(void *v, const char *buf, int len) {
auto strm = reinterpret_cast<stream *>(v);
return strm->write(buf, len);
}
static fpos_t strm_seek(void *v, fpos_t off, int whence) {
auto strm = reinterpret_cast<stream *>(v);
return strm->seek(off, whence);
}
static int strm_close(void *v) {
auto strm = reinterpret_cast<stream *>(v);
delete strm;
return 0;
}
sFILE make_stream(stream_ptr &&strm) {
sFILE fp(funopen(strm.release(), strm_read, strm_write, strm_seek, strm_close), fclose);
setbuf(fp.get(), nullptr);
return fp;
}
int stream::read(void *buf, size_t len) {
LOGE("This stream does not support read");
return -1;
}
int stream::write(const void *buf, size_t len) {
LOGE("This stream does not support write");
return -1;
}
off_t stream::seek(off_t off, int whence) {
LOGE("This stream does not support seek");
return -1;
}
int filter_stream::read(void *buf, size_t len) {
return fread(buf, 1, len, fp.get());
}
int filter_stream::write(const void *buf, size_t len) {
return fwrite(buf, 1, len, fp.get());
}
void filter_stream::set_base(sFILE &&f) {
fp = std::move(f);
}
off_t seekable_stream::seek_pos(off_t off, int whence) {
switch (whence) {
case SEEK_CUR:
return _pos + off;
case SEEK_END:
return end_pos() + off;
case SEEK_SET:
return off;
default:
return -1;
}
}
byte_stream::byte_stream(uint8_t *&buf, size_t &len) : _buf(buf), _len(len) {
buf = nullptr;
len = 0;
}
int byte_stream::read(void *buf, size_t len) {
len = std::min(len, _len - _pos);
memcpy(buf, _buf + _pos, len);
return len;
}
int byte_stream::write(const void *buf, size_t len) {
resize(_pos + len);
memcpy(_buf + _pos, buf, len);
_pos += len;
_len = std::max(_len, _pos);
return len;
}
off_t byte_stream::seek(off_t off, int whence) {
off_t np = seek_pos(off, whence);
if (np < 0)
return -1;
resize(np, true);
_pos = np;
return np;
}
void byte_stream::resize(size_t new_pos, bool zero) {
bool resize = false;
size_t old_cap = _cap;
while (new_pos > _cap) {
_cap = _cap ? (_cap << 1) - (_cap >> 1) : 1 << 12;
resize = true;
}
if (resize) {
_buf = (uint8_t *) xrealloc(_buf, _cap);
if (zero)
memset(_buf + old_cap, 0, _cap - old_cap);
}
}
int fd_stream::read(void *buf, size_t len) {
return ::read(fd, buf, len);
}
int fd_stream::write(const void *buf, size_t len) {
return ::write(fd, buf, len);
}
off_t fd_stream::seek(off_t off, int whence) {
return lseek(fd, off, whence);
}