| OLD | NEW |
| (Empty) |
| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "net/spdy/spdy_prefixed_buffer_reader.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 | |
| 9 namespace net { | |
| 10 | |
| 11 SpdyPrefixedBufferReader::SpdyPrefixedBufferReader( | |
| 12 const char* prefix, | |
| 13 size_t prefix_length, | |
| 14 const char* suffix, | |
| 15 size_t suffix_length) | |
| 16 : prefix_(prefix), | |
| 17 suffix_(suffix), | |
| 18 prefix_length_(prefix_length), | |
| 19 suffix_length_(suffix_length) {} | |
| 20 | |
| 21 size_t SpdyPrefixedBufferReader::Available() { | |
| 22 return prefix_length_ + suffix_length_; | |
| 23 } | |
| 24 | |
| 25 bool SpdyPrefixedBufferReader::ReadN(size_t count, char* out) { | |
| 26 if (Available() < count) | |
| 27 return false; | |
| 28 | |
| 29 if (prefix_length_ >= count) { | |
| 30 // Read is fully satisfied by the prefix. | |
| 31 std::copy(prefix_, prefix_ + count, out); | |
| 32 prefix_ += count; | |
| 33 prefix_length_ -= count; | |
| 34 return true; | |
| 35 } else if (prefix_length_ != 0) { | |
| 36 // Read is partially satisfied by the prefix. | |
| 37 out = std::copy(prefix_, prefix_ + prefix_length_, out); | |
| 38 count -= prefix_length_; | |
| 39 prefix_length_ = 0; | |
| 40 // Fallthrough to suffix read. | |
| 41 } | |
| 42 DCHECK(suffix_length_ >= count); | |
| 43 // Read is satisfied by the suffix. | |
| 44 std::copy(suffix_, suffix_ + count, out); | |
| 45 suffix_ += count; | |
| 46 suffix_length_ -= count; | |
| 47 return true; | |
| 48 } | |
| 49 | |
| 50 bool SpdyPrefixedBufferReader::ReadN(size_t count, | |
| 51 SpdyPinnableBufferPiece* out) { | |
| 52 if (Available() < count) | |
| 53 return false; | |
| 54 | |
| 55 out->storage_.reset(); | |
| 56 out->length_ = count; | |
| 57 | |
| 58 if (prefix_length_ >= count) { | |
| 59 // Read is fully satisfied by the prefix. | |
| 60 out->buffer_ = prefix_; | |
| 61 prefix_ += count; | |
| 62 prefix_length_ -= count; | |
| 63 return true; | |
| 64 } else if (prefix_length_ != 0) { | |
| 65 // Read is only partially satisfied by the prefix. We need to allocate | |
| 66 // contiguous storage as the read spans the prefix & suffix. | |
| 67 out->storage_.reset(new char[count]); | |
| 68 out->buffer_ = out->storage_.get(); | |
| 69 ReadN(count, out->storage_.get()); | |
| 70 return true; | |
| 71 } else { | |
| 72 DCHECK(suffix_length_ >= count); | |
| 73 // Read is fully satisfied by the suffix. | |
| 74 out->buffer_ = suffix_; | |
| 75 suffix_ += count; | |
| 76 suffix_length_ -= count; | |
| 77 return true; | |
| 78 } | |
| 79 } | |
| 80 | |
| 81 } // namespace net | |
| OLD | NEW |