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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// This file contains the definition of functions for dealing with data urls.
#include "utils/cross/dataurl.h"
#include "core/cross/types.h"
#include "utils/cross/base64.h"
namespace o3d {
namespace dataurl {
const char* const kEmptyDataURL = "data:,";
String ToDataURL(const String& mime_type, const void* data, size_t length) {
String header(String("data:") + mime_type + ";base64,");
String result(header.size() + base64::GetEncodeLength(length), ' ');
result.replace(0, header.size(), header);
base64::Encode(data, length, &result[header.size()]);
return result;
}
// Decodes the data URL and stores a pointer to the data in dst_buffer
bool FromDataURL(const String& data_url,
scoped_array<uint8>* dst_buffer,
size_t* output_length,
String* error_string) {
// First parse the data_url
const String kDataHeader("data:");
const String kBase64Header(";base64,");
// The string has to be long enough.
if (data_url.size() <= kDataHeader.size() + kBase64Header.size()) {
*error_string = "Invalid formatting: The data URL is not long enough.";
return false;
}
// it must start with "data:"
if (data_url.compare(0, kDataHeader.size(), kDataHeader) != 0) {
*error_string
= "Invalid formatting: The data URL must start with 'data:'";
return false;
}
// we only support base64 data URL's
String::size_type data_index = data_url.find(kBase64Header);
if (data_index == String::npos) {
*error_string
= "Invalid formatting: The data URL have ';base64,' in the header.";
return false;
}
// The start of the data.
data_index += kBase64Header.size();
if (data_index >= data_url.size()) {
*error_string
= "Invalid formatting: There must be data in the body of the data URL.";
return false;
}
// Get the length of the decoded data
size_t input_length = data_url.size() - data_index;
base64::DecodeStatus return_code = base64::GetDecodeLength(
&data_url[data_index],
input_length,
output_length);
if (return_code != base64::kSuccess) {
if (return_code == base64::kPadError) {
*error_string
= "Invalid formatting: Padding error in the data URL data.";
} else {
*error_string
= "Invalid formatting: Bad character error in the data URL data.";
}
return false;
}
dst_buffer->reset(new uint8[*output_length]);
base64::Decode(&data_url[data_index],
input_length,
dst_buffer->get(),
(*output_length));
return true;
}
} // namespace dataurl
} // namespace o3d
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