mirror of
https://github.com/classilla/tenfourfox.git
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163 lines
4.5 KiB
C++
163 lines
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsCacheMetaData.h"
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#include "nsICacheEntryDescriptor.h"
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const char *
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nsCacheMetaData::GetElement(const char * key)
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{
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const char * data = mBuffer;
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const char * limit = mBuffer + mMetaSize;
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while (data < limit) {
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// Point to the value part
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const char * value = data + strlen(data) + 1;
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MOZ_ASSERT(value < limit, "Cache Metadata corrupted");
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if (strcmp(data, key) == 0)
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return value;
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// Skip value part
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data = value + strlen(value) + 1;
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}
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MOZ_ASSERT(data == limit, "Metadata corrupted");
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return nullptr;
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}
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nsresult
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nsCacheMetaData::SetElement(const char * key,
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const char * value)
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{
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const uint32_t keySize = strlen(key) + 1;
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char * pos = (char *)GetElement(key);
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if (!value) {
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// No value means remove the key/value pair completely, if existing
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if (pos) {
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uint32_t oldValueSize = strlen(pos) + 1;
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uint32_t offset = pos - mBuffer;
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uint32_t remainder = mMetaSize - (offset + oldValueSize);
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memmove(pos - keySize, pos + oldValueSize, remainder);
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mMetaSize -= keySize + oldValueSize;
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}
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return NS_OK;
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}
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const uint32_t valueSize = strlen(value) + 1;
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uint32_t newSize = mMetaSize + valueSize;
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if (pos) {
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const uint32_t oldValueSize = strlen(pos) + 1;
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const uint32_t offset = pos - mBuffer;
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const uint32_t remainder = mMetaSize - (offset + oldValueSize);
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// Update the value in place
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newSize -= oldValueSize;
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nsresult rv = EnsureBuffer(newSize);
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NS_ENSURE_SUCCESS(rv, rv);
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// Move the remainder to the right place
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pos = mBuffer + offset;
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memmove(pos + valueSize, pos + oldValueSize, remainder);
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} else {
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// allocate new meta data element
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newSize += keySize;
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nsresult rv = EnsureBuffer(newSize);
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NS_ENSURE_SUCCESS(rv, rv);
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// Add after last element
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pos = mBuffer + mMetaSize;
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memcpy(pos, key, keySize);
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pos += keySize;
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}
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// Update value
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memcpy(pos, value, valueSize);
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mMetaSize = newSize;
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return NS_OK;
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}
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nsresult
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nsCacheMetaData::FlattenMetaData(char * buffer, uint32_t bufSize)
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{
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if (mMetaSize > bufSize) {
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NS_ERROR("buffer size too small for meta data.");
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return NS_ERROR_OUT_OF_MEMORY;
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}
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memcpy(buffer, mBuffer, mMetaSize);
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return NS_OK;
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}
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nsresult
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nsCacheMetaData::UnflattenMetaData(const char * data, uint32_t size)
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{
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if (data && size) {
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// Check if the metadata ends with a zero byte.
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if (data[size-1] != '\0') {
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NS_ERROR("Cache MetaData is not null terminated");
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return NS_ERROR_ILLEGAL_VALUE;
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}
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// Check that there are an even number of zero bytes
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// to match the pattern { key \0 value \0 }
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bool odd = false;
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for (uint32_t i = 0; i < size; i++) {
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if (data[i] == '\0')
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odd = !odd;
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}
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if (odd) {
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NS_ERROR("Cache MetaData is malformed");
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return NS_ERROR_ILLEGAL_VALUE;
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}
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nsresult rv = EnsureBuffer(size);
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NS_ENSURE_SUCCESS(rv, rv);
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memcpy(mBuffer, data, size);
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mMetaSize = size;
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}
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return NS_OK;
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}
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nsresult
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nsCacheMetaData::VisitElements(nsICacheMetaDataVisitor * visitor)
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{
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const char * data = mBuffer;
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const char * limit = mBuffer + mMetaSize;
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while (data < limit) {
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const char * key = data;
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// Skip key part
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data += strlen(data) + 1;
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MOZ_ASSERT(data < limit, "Metadata corrupted");
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bool keepGoing;
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nsresult rv = visitor->VisitMetaDataElement(key, data, &keepGoing);
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if (NS_FAILED(rv) || !keepGoing)
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return NS_OK;
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// Skip value part
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data += strlen(data) + 1;
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}
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MOZ_ASSERT(data == limit, "Metadata corrupted");
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return NS_OK;
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}
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nsresult
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nsCacheMetaData::EnsureBuffer(uint32_t bufSize)
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{
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if (mBufferSize < bufSize) {
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char * buf = (char *)realloc(mBuffer, bufSize);
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if (!buf) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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mBuffer = buf;
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mBufferSize = bufSize;
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}
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return NS_OK;
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}
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