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/*
* Copyright 2011 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "sfntly/data/font_input_stream.h"
#include <algorithm>
namespace sfntly {
FontInputStream::FontInputStream(InputStream* is)
: stream_(is), position_(0), length_(0), bounded_(false) {
}
FontInputStream::FontInputStream(InputStream* is, size_t length)
: stream_(is), position_(0), length_(length), bounded_(true) {
}
FontInputStream::~FontInputStream() {
// Do not close here, underlying InputStream will close themselves.
}
int32_t FontInputStream::Available() {
if (stream_) {
return stream_->Available();
}
return 0;
}
void FontInputStream::Close() {
if (stream_) {
stream_->Close();
}
}
void FontInputStream::Mark(int32_t readlimit) {
if (stream_) {
stream_->Mark(readlimit);
}
}
bool FontInputStream::MarkSupported() {
if (stream_) {
return stream_->MarkSupported();
}
return false;
}
void FontInputStream::Reset() {
if (stream_) {
stream_->Reset();
}
}
int32_t FontInputStream::Read() {
if (!stream_ || (bounded_ && position_ >= length_)) {
return -1;
}
int32_t b = stream_->Read();
if (b >= 0) {
position_++;
}
return b;
}
int32_t FontInputStream::Read(ByteVector* b, int32_t offset, int32_t length) {
if (!stream_ || offset < 0 || length < 0 ||
(bounded_ && position_ >= length_)) {
return -1;
}
int32_t bytes_to_read =
bounded_ ? std::min<int32_t>(length, (int32_t)(length_ - position_)) :
length;
int32_t bytes_read = stream_->Read(b, offset, bytes_to_read);
position_ += bytes_read;
return bytes_read;
}
int32_t FontInputStream::Read(ByteVector* b) {
return Read(b, 0, b->size());
}
int32_t FontInputStream::ReadChar() {
return Read();
}
int32_t FontInputStream::ReadUShort() {
return 0xffff & (Read() << 8 | Read());
}
int32_t FontInputStream::ReadShort() {
return ((Read() << 8 | Read()) << 16) >> 16;
}
int32_t FontInputStream::ReadUInt24() {
return 0xffffff & (Read() << 16 | Read() << 8 | Read());
}
int64_t FontInputStream::ReadULong() {
return 0xffffffffL & ReadLong();
}
int32_t FontInputStream::ReadULongAsInt() {
int64_t ulong = ReadULong();
return ((int32_t)ulong) & ~0x80000000;
}
int32_t FontInputStream::ReadLong() {
return Read() << 24 | Read() << 16 | Read() << 8 | Read();
}
int32_t FontInputStream::ReadFixed() {
return ReadLong();
}
int64_t FontInputStream::ReadDateTimeAsLong() {
return (int64_t)ReadULong() << 32 | ReadULong();
}
int64_t FontInputStream::Skip(int64_t n) {
if (stream_) {
int64_t skipped = stream_->Skip(n);
position_ += skipped;
return skipped;
}
return 0;
}
} // namespace sfntly
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