| /* libs/graphics/images/SkStream.cpp |
| ** |
| ** Copyright 2006, The Android Open Source Project |
| ** |
| ** Licensed under the Apache License, Version 2.0 (the "License"); |
| ** you may not use this file except in compliance with the License. |
| ** You may obtain a copy of the License at |
| ** |
| ** http://www.apache.org/licenses/LICENSE-2.0 |
| ** |
| ** Unless required by applicable law or agreed to in writing, software |
| ** distributed under the License is distributed on an "AS IS" BASIS, |
| ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| ** See the License for the specific language governing permissions and |
| ** limitations under the License. |
| */ |
| |
| #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; |
| } |
| |
| size_t SkStream::readPackedUInt() { |
| uint8_t byte; |
| if (!this->read(&byte, 1)) { |
| return 0; |
| } |
| if (byte != 0xFF) { |
| return byte; |
| } |
| |
| uint16_t word; |
| if (!this->read(&word, 2)) { |
| return 0; |
| } |
| if (word != 0xFFFF) { |
| return word; |
| } |
| |
| uint32_t quad; |
| if (!this->read(&quad, 4)) { |
| return 0; |
| } |
| return quad; |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////////////// |
| |
| 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) { |
| if (value < 0xFF) { |
| return this->write8(value); |
| } else if (value < 0xFFFF) { |
| return this->write8(0xFF) && this->write16(value); |
| } else { |
| return this->write16(0xFFFF) && this->write32(value); |
| } |
| } |
| |
| 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; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| 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) { |
| if (copyData) { |
| fData = SkData::NewWithCopy(src, size); |
| } else { |
| fData = SkData::NewWithProc(src, size, NULL, NULL); |
| } |
| 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(); |
| if (copyData) { |
| fData = SkData::NewWithCopy(src, size); |
| } else { |
| fData = SkData::NewWithProc(src, size, NULL, NULL); |
| } |
| 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; |
| } |