| /* |
| * 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 "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 |