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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.
*/
#if defined (WIN32)
#include <windows.h>
#endif
#include <string.h>
#include <algorithm>
#include "sfntly/port/memory_input_stream.h"
#include "sfntly/port/exception_type.h"
namespace sfntly {
MemoryInputStream::MemoryInputStream()
: buffer_(NULL),
position_(0),
length_(0) {
}
MemoryInputStream::~MemoryInputStream() {
Close();
}
int32_t MemoryInputStream::Available() {
return length_ - position_;
}
void MemoryInputStream::Close() {
}
void MemoryInputStream::Mark(int32_t readlimit) {
// NOP
UNREFERENCED_PARAMETER(readlimit);
}
bool MemoryInputStream::MarkSupported() {
return false;
}
int32_t MemoryInputStream::Read() {
if (!buffer_) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IOException("no memory attached");
#endif
return 0;
}
if (position_ >= length_) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IOException("eof reached");
#endif
return 0;
}
byte_t value = buffer_[position_++];
return value;
}
int32_t MemoryInputStream::Read(ByteVector* b) {
return Read(b, 0, b->size());
}
int32_t MemoryInputStream::Read(ByteVector* b, int32_t offset, int32_t length) {
assert(b);
if (!buffer_) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IOException("no memory attached");
#endif
return 0;
}
if (position_ >= length_) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IOException("eof reached");
#endif
return 0;
}
size_t read_count = std::min<size_t>(length_ - position_, length);
if (b->size() < (size_t)(offset + read_count)) {
b->resize((size_t)(offset + read_count));
}
memcpy(&((*b)[offset]), buffer_ + position_, read_count);
position_ += read_count;
return read_count;
}
void MemoryInputStream::Reset() {
// NOP
}
int64_t MemoryInputStream::Skip(int64_t n) {
if (!buffer_) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IOException("no memory attached");
#endif
return 0;
}
int64_t skip_count = 0;
if (n < 0) { // move backwards
skip_count = std::max<int64_t>(0 - (int64_t)position_, n);
position_ -= (size_t)(0 - skip_count);
} else {
skip_count = std::min<size_t>(length_ - position_, (size_t)n);
position_ += (size_t)skip_count;
}
return skip_count;
}
void MemoryInputStream::Unread(ByteVector* b) {
Unread(b, 0, b->size());
}
void MemoryInputStream::Unread(ByteVector* b, int32_t offset, int32_t length) {
assert(b);
assert(b->size() >= size_t(offset + length));
if (!buffer_) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IOException("no memory attached");
#endif
return;
}
size_t unread_count = std::min<size_t>(position_, length);
position_ -= unread_count;
Read(b, offset, length);
position_ -= unread_count;
}
bool MemoryInputStream::Attach(const byte_t* buffer, size_t length) {
assert(buffer);
assert(length);
buffer_ = buffer;
length_ = length;
return true;
}
} // namespace sfntly
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