gecko/netwerk/cache/nsCacheMetaData.cpp
Ehsan Akhgari 8c296bbcd4 Bug 579517 - Part 1: Automated conversion of NSPR numeric types to stdint types in Gecko; r=bsmedberg
This patch was generated by a script.  Here's the source of the script for
future reference:

function convert() {
echo "Converting $1 to $2..."
find . ! -wholename "*nsprpub*" \
       ! -wholename "*security/nss*" \
       ! -wholename "*/.hg*" \
       ! -wholename "obj-ff-dbg*" \
       ! -name nsXPCOMCID.h \
       ! -name prtypes.h \
         -type f \
      \( -iname "*.cpp" \
         -o -iname "*.h" \
         -o -iname "*.c" \
         -o -iname "*.cc" \
         -o -iname "*.idl" \
         -o -iname "*.ipdl" \
         -o -iname "*.ipdlh" \
         -o -iname "*.mm" \) | \
    xargs -n 1 sed -i -e "s/\b$1\b/$2/g"
}

convert PRInt8 int8_t
convert PRUint8 uint8_t
convert PRInt16 int16_t
convert PRUint16 uint16_t
convert PRInt32 int32_t
convert PRUint32 uint32_t
convert PRInt64 int64_t
convert PRUint64 uint64_t

convert PRIntn int
convert PRUintn unsigned

convert PRSize size_t

convert PROffset32 int32_t
convert PROffset64 int64_t

convert PRPtrdiff ptrdiff_t

convert PRFloat64 double
2012-08-22 11:56:38 -04:00

164 lines
4.5 KiB
C++

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