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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkStream.h"
#include "SkData.h"
#include "SkFixed.h"
#include "SkString.h"
#include "SkOSFile.h"
SkStream::~SkStream() {}
const char* SkStream::getFileName()
{
// override in subclass if you represent a file
return NULL;
}
const void* SkStream::getMemoryBase()
{
// override in subclass if you represent a memory block
return NULL;
}
size_t SkStream::skip(size_t size)
{
/* Check for size == 0, and just return 0. If we passed that
to read(), it would interpret it as a request for the entire
size of the stream.
*/
return size ? this->read(NULL, size) : 0;
}
int8_t SkStream::readS8() {
int8_t value;
SkDEBUGCODE(size_t len =) this->read(&value, 1);
SkASSERT(1 == len);
return value;
}
int16_t SkStream::readS16() {
int16_t value;
SkDEBUGCODE(size_t len =) this->read(&value, 2);
SkASSERT(2 == len);
return value;
}
int32_t SkStream::readS32() {
int32_t value;
SkDEBUGCODE(size_t len =) this->read(&value, 4);
SkASSERT(4 == len);
return value;
}
SkScalar SkStream::readScalar() {
SkScalar value;
SkDEBUGCODE(size_t len =) this->read(&value, sizeof(SkScalar));
SkASSERT(sizeof(SkScalar) == len);
return value;
}
#define SK_MAX_BYTE_FOR_U8 0xFD
#define SK_BYTE_SENTINEL_FOR_U16 0xFE
#define SK_BYTE_SENTINEL_FOR_U32 0xFF
size_t SkStream::readPackedUInt() {
uint8_t byte;
if (!this->read(&byte, 1)) {
return 0;
}
if (SK_BYTE_SENTINEL_FOR_U16 == byte) {
return this->readU16();
} else if (SK_BYTE_SENTINEL_FOR_U32 == byte) {
return this->readU32();
} else {
return byte;
}
}
//////////////////////////////////////////////////////////////////////////////////////
SkWStream::~SkWStream()
{
}
void SkWStream::newline()
{
this->write("\n", 1);
}
void SkWStream::flush()
{
}
bool SkWStream::writeText(const char text[])
{
SkASSERT(text);
return this->write(text, strlen(text));
}
bool SkWStream::writeDecAsText(int32_t dec)
{
SkString tmp;
tmp.appendS32(dec);
return this->write(tmp.c_str(), tmp.size());
}
bool SkWStream::writeBigDecAsText(int64_t dec, int minDigits)
{
SkString tmp;
tmp.appendS64(dec, minDigits);
return this->write(tmp.c_str(), tmp.size());
}
bool SkWStream::writeHexAsText(uint32_t hex, int digits)
{
SkString tmp;
tmp.appendHex(hex, digits);
return this->write(tmp.c_str(), tmp.size());
}
bool SkWStream::writeScalarAsText(SkScalar value)
{
SkString tmp;
tmp.appendScalar(value);
return this->write(tmp.c_str(), tmp.size());
}
bool SkWStream::write8(U8CPU value) {
uint8_t v = SkToU8(value);
return this->write(&v, 1);
}
bool SkWStream::write16(U16CPU value) {
uint16_t v = SkToU16(value);
return this->write(&v, 2);
}
bool SkWStream::write32(uint32_t value) {
return this->write(&value, 4);
}
bool SkWStream::writeScalar(SkScalar value) {
return this->write(&value, sizeof(value));
}
bool SkWStream::writePackedUInt(size_t value) {
uint8_t data[5];
size_t len = 1;
if (value <= SK_MAX_BYTE_FOR_U8) {
data[0] = value;
len = 1;
} else if (value <= 0xFFFF) {
uint16_t value16 = value;
data[0] = SK_BYTE_SENTINEL_FOR_U16;
memcpy(&data[1], &value16, 2);
len = 3;
} else {
uint32_t value32 = value;
data[0] = SK_BYTE_SENTINEL_FOR_U32;
memcpy(&data[1], &value32, 4);
len = 5;
}
return this->write(data, len);
}
bool SkWStream::writeStream(SkStream* stream, size_t length) {
char scratch[1024];
const size_t MAX = sizeof(scratch);
while (length != 0) {
size_t n = length;
if (n > MAX) {
n = MAX;
}
stream->read(scratch, n);
if (!this->write(scratch, n)) {
return false;
}
length -= n;
}
return true;
}
bool SkWStream::writeData(const SkData* data) {
if (data) {
this->write(data->data(), data->size());
}
return true;
}
///////////////////////////////////////////////////////////////////////////////
SkFILEStream::SkFILEStream(const char file[]) : fName(file)
{
fFILE = file ? sk_fopen(fName.c_str(), kRead_SkFILE_Flag) : NULL;
}
SkFILEStream::~SkFILEStream()
{
if (fFILE)
sk_fclose(fFILE);
}
void SkFILEStream::setPath(const char path[])
{
fName.set(path);
if (fFILE)
{
sk_fclose(fFILE);
fFILE = NULL;
}
if (path)
fFILE = sk_fopen(fName.c_str(), kRead_SkFILE_Flag);
}
const char* SkFILEStream::getFileName()
{
return fName.c_str();
}
bool SkFILEStream::rewind()
{
if (fFILE)
{
if (sk_frewind(fFILE))
return true;
// we hit an error
sk_fclose(fFILE);
fFILE = NULL;
}
return false;
}
size_t SkFILEStream::read(void* buffer, size_t size)
{
if (fFILE)
{
if (buffer == NULL && size == 0) // special signature, they want the total size
return sk_fgetsize(fFILE);
else
return sk_fread(buffer, size, fFILE);
}
return 0;
}
///////////////////////////////////////////////////////////////////////////////
static SkData* newFromParams(const void* src, size_t size, bool copyData) {
if (copyData) {
return SkData::NewWithCopy(src, size);
} else {
return SkData::NewWithProc(src, size, NULL, NULL);
}
}
SkMemoryStream::SkMemoryStream() {
fData = SkData::NewEmpty();
fOffset = 0;
}
SkMemoryStream::SkMemoryStream(size_t size) {
fData = SkData::NewFromMalloc(sk_malloc_throw(size), size);
fOffset = 0;
}
SkMemoryStream::SkMemoryStream(const void* src, size_t size, bool copyData) {
fData = newFromParams(src, size, copyData);
fOffset = 0;
}
SkMemoryStream::~SkMemoryStream() {
fData->unref();
}
void SkMemoryStream::setMemoryOwned(const void* src, size_t size) {
fData->unref();
fData = SkData::NewFromMalloc(src, size);
fOffset = 0;
}
void SkMemoryStream::setMemory(const void* src, size_t size, bool copyData) {
fData->unref();
fData = newFromParams(src, size, copyData);
fOffset = 0;
}
SkData* SkMemoryStream::copyToData() const {
fData->ref();
return fData;
}
SkData* SkMemoryStream::setData(SkData* data) {
SkRefCnt_SafeAssign(fData, data);
return data;
}
void SkMemoryStream::skipToAlign4() {
// cast to remove unary-minus warning
fOffset += -(int)fOffset & 0x03;
}
bool SkMemoryStream::rewind() {
fOffset = 0;
return true;
}
size_t SkMemoryStream::read(void* buffer, size_t size) {
size_t dataSize = fData->size();
if (buffer == NULL && size == 0) // special signature, they want the total size
return dataSize;
// if buffer is NULL, seek ahead by size
if (size == 0) {
return 0;
}
if (size > dataSize - fOffset) {
size = dataSize - fOffset;
}
if (buffer) {
memcpy(buffer, fData->bytes() + fOffset, size);
}
fOffset += size;
return size;
}
const void* SkMemoryStream::getMemoryBase() {
return fData->data();
}
const void* SkMemoryStream::getAtPos() {
return fData->bytes() + fOffset;
}
size_t SkMemoryStream::seek(size_t offset) {
if (offset > fData->size()) {
offset = fData->size();
}
fOffset = offset;
return offset;
}
///////////////////////////////////////////////////////////////////////////////
SkBufferStream::SkBufferStream(SkStream* proxy, size_t bufferSize)
: fProxy(proxy)
{
SkASSERT(proxy != NULL);
proxy->ref();
this->init(NULL, bufferSize);
}
SkBufferStream::SkBufferStream(SkStream* proxy, void* buffer, size_t bufferSize)
: fProxy(proxy)
{
SkASSERT(proxy != NULL);
SkASSERT(buffer == NULL || bufferSize != 0); // init(addr, 0) makes no sense, we must know how big their buffer is
proxy->ref();
this->init(buffer, bufferSize);
}
void SkBufferStream::init(void* buffer, size_t bufferSize)
{
if (bufferSize == 0)
bufferSize = kDefaultBufferSize;
fOrigBufferSize = bufferSize;
fBufferSize = bufferSize;
fBufferOffset = bufferSize; // to trigger a reload on the first read()
if (buffer == NULL)
{
fBuffer = (char*)sk_malloc_throw(fBufferSize);
fWeOwnTheBuffer = true;
}
else
{
fBuffer = (char*)buffer;
fWeOwnTheBuffer = false;
}
}
SkBufferStream::~SkBufferStream()
{
fProxy->unref();
if (fWeOwnTheBuffer)
sk_free(fBuffer);
}
bool SkBufferStream::rewind()
{
fBufferOffset = fBufferSize = fOrigBufferSize;
return fProxy->rewind();
}
const char* SkBufferStream::getFileName()
{
return fProxy->getFileName();
}
#ifdef SK_DEBUG
// #define SK_TRACE_BUFFERSTREAM
#endif
size_t SkBufferStream::read(void* buffer, size_t size) {
#ifdef SK_TRACE_BUFFERSTREAM
SkDebugf("Request %d", size);
#endif
if (buffer == NULL && size == 0) {
return fProxy->read(buffer, size); // requesting total size
}
if (0 == size) {
return 0;
}
// skip size bytes
if (NULL == buffer) {
size_t remaining = fBufferSize - fBufferOffset;
if (remaining >= size) {
fBufferOffset += size;
return size;
}
// if we get here, we are being asked to skip beyond our current buffer
// so reset our offset to force a read next time, and skip the diff
// in our proxy
fBufferOffset = fOrigBufferSize;
return remaining + fProxy->read(NULL, size - remaining);
}
size_t s = size;
size_t actuallyRead = 0;
// flush what we can from our fBuffer
if (fBufferOffset < fBufferSize)
{
if (s > fBufferSize - fBufferOffset)
s = fBufferSize - fBufferOffset;
memcpy(buffer, fBuffer + fBufferOffset, s);
#ifdef SK_TRACE_BUFFERSTREAM
SkDebugf(" flush %d", s);
#endif
size -= s;
fBufferOffset += s;
buffer = (char*)buffer + s;
actuallyRead = s;
}
// check if there is more to read
if (size)
{
SkASSERT(fBufferOffset >= fBufferSize); // need to refill our fBuffer
if (size < fBufferSize) // lets try to read more than the request
{
s = fProxy->read(fBuffer, fBufferSize);
#ifdef SK_TRACE_BUFFERSTREAM
SkDebugf(" read %d into fBuffer", s);
#endif
if (size > s) // they asked for too much
size = s;
if (size)
{
memcpy(buffer, fBuffer, size);
actuallyRead += size;
#ifdef SK_TRACE_BUFFERSTREAM
SkDebugf(" memcpy %d into dst", size);
#endif
}
fBufferOffset = size;
fBufferSize = s; // record the (possibly smaller) size for the buffer
}
else // just do a direct read
{
actuallyRead += fProxy->read(buffer, size);
#ifdef SK_TRACE_BUFFERSTREAM
SkDebugf(" direct read %d", size);
#endif
}
}
#ifdef SK_TRACE_BUFFERSTREAM
SkDebugf("\n");
#endif
return actuallyRead;
}
const void* SkBufferStream::getMemoryBase()
{
return fProxy->getMemoryBase();
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////////
SkFILEWStream::SkFILEWStream(const char path[])
{
fFILE = sk_fopen(path, kWrite_SkFILE_Flag);
}
SkFILEWStream::~SkFILEWStream()
{
if (fFILE)
sk_fclose(fFILE);
}
bool SkFILEWStream::write(const void* buffer, size_t size)
{
if (fFILE == NULL)
return false;
if (sk_fwrite(buffer, size, fFILE) != size)
{
SkDEBUGCODE(SkDebugf("SkFILEWStream failed writing %d bytes\n", size);)
sk_fclose(fFILE);
fFILE = NULL;
return false;
}
return true;
}
void SkFILEWStream::flush()
{
if (fFILE)
sk_fflush(fFILE);
}
////////////////////////////////////////////////////////////////////////
SkMemoryWStream::SkMemoryWStream(void* buffer, size_t size)
: fBuffer((char*)buffer), fMaxLength(size), fBytesWritten(0)
{
}
bool SkMemoryWStream::write(const void* buffer, size_t size)
{
size = SkMin32(size, fMaxLength - fBytesWritten);
if (size > 0)
{
memcpy(fBuffer + fBytesWritten, buffer, size);
fBytesWritten += size;
return true;
}
return false;
}
////////////////////////////////////////////////////////////////////////
#define SkDynamicMemoryWStream_MinBlockSize 256
struct SkDynamicMemoryWStream::Block {
Block* fNext;
char* fCurr;
char* fStop;
const char* start() const { return (const char*)(this + 1); }
char* start() { return (char*)(this + 1); }
size_t avail() const { return fStop - fCurr; }
size_t written() const { return fCurr - this->start(); }
void init(size_t size)
{
fNext = NULL;
fCurr = this->start();
fStop = this->start() + size;
}
const void* append(const void* data, size_t size)
{
SkASSERT((size_t)(fStop - fCurr) >= size);
memcpy(fCurr, data, size);
fCurr += size;
return (const void*)((const char*)data + size);
}
};
SkDynamicMemoryWStream::SkDynamicMemoryWStream()
: fHead(NULL), fTail(NULL), fBytesWritten(0), fCopy(NULL)
{
}
SkDynamicMemoryWStream::~SkDynamicMemoryWStream()
{
reset();
}
void SkDynamicMemoryWStream::reset()
{
this->invalidateCopy();
Block* block = fHead;
while (block != NULL) {
Block* next = block->fNext;
sk_free(block);
block = next;
}
fHead = fTail = NULL;
fBytesWritten = 0;
}
bool SkDynamicMemoryWStream::write(const void* buffer, size_t count)
{
if (count > 0) {
this->invalidateCopy();
fBytesWritten += count;
size_t size;
if (fTail != NULL && fTail->avail() > 0) {
size = SkMin32(fTail->avail(), count);
buffer = fTail->append(buffer, size);
SkASSERT(count >= size);
count -= size;
if (count == 0)
return true;
}
size = SkMax32(count, SkDynamicMemoryWStream_MinBlockSize);
Block* block = (Block*)sk_malloc_throw(sizeof(Block) + size);
block->init(size);
block->append(buffer, count);
if (fTail != NULL)
fTail->fNext = block;
else
fHead = fTail = block;
fTail = block;
}
return true;
}
bool SkDynamicMemoryWStream::write(const void* buffer, size_t offset, size_t count)
{
if (offset + count > fBytesWritten) {
return false; // test does not partially modify
}
this->invalidateCopy();
Block* block = fHead;
while (block != NULL) {
size_t size = block->written();
if (offset < size) {
size_t part = offset + count > size ? size - offset : count;
memcpy(block->start() + offset, buffer, part);
if (count <= part)
return true;
count -= part;
buffer = (const void*) ((char* ) buffer + part);
}
offset = offset > size ? offset - size : 0;
block = block->fNext;
}
return false;
}
bool SkDynamicMemoryWStream::read(void* buffer, size_t offset, size_t count)
{
if (offset + count > fBytesWritten)
return false; // test does not partially modify
Block* block = fHead;
while (block != NULL) {
size_t size = block->written();
if (offset < size) {
size_t part = offset + count > size ? size - offset : count;
memcpy(buffer, block->start() + offset, part);
if (count <= part)
return true;
count -= part;
buffer = (void*) ((char* ) buffer + part);
}
offset = offset > size ? offset - size : 0;
block = block->fNext;
}
return false;
}
void SkDynamicMemoryWStream::copyTo(void* dst) const
{
if (fCopy) {
memcpy(dst, fCopy->data(), fBytesWritten);
} else {
Block* block = fHead;
while (block != NULL) {
size_t size = block->written();
memcpy(dst, block->start(), size);
dst = (void*)((char*)dst + size);
block = block->fNext;
}
}
}
void SkDynamicMemoryWStream::padToAlign4()
{
// cast to remove unary-minus warning
int padBytes = -(int)fBytesWritten & 0x03;
if (padBytes == 0)
return;
int zero = 0;
write(&zero, padBytes);
}
SkData* SkDynamicMemoryWStream::copyToData() const {
if (NULL == fCopy) {
void* buffer = sk_malloc_throw(fBytesWritten);
this->copyTo(buffer);
fCopy = SkData::NewFromMalloc(buffer, fBytesWritten);
}
fCopy->ref();
return fCopy;
}
void SkDynamicMemoryWStream::invalidateCopy() {
if (fCopy) {
fCopy->unref();
fCopy = NULL;
}
}
///////////////////////////////////////////////////////////////////////////////
void SkDebugWStream::newline()
{
#ifdef SK_DEBUG
SkDebugf("\n");
#endif
}
bool SkDebugWStream::write(const void* buffer, size_t size)
{
#ifdef SK_DEBUG
char* s = new char[size+1];
memcpy(s, buffer, size);
s[size] = 0;
SkDebugf("%s", s);
delete[] s;
#endif
return true;
}