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| 1 /* | |
| 2 * Copyright 2015 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #include "SkDeflateWStream.h" | |
| 9 // https://skia.org/dev/contrib/style#no-define-before-sktypes | |
| 10 | |
| 11 #ifndef SK_NO_FLATE | |
| 12 | |
| 13 #include "zlib.h" | |
| 14 | |
| 15 #define SKDEFLATEWSTREAM_INPUT_BUFFER_SIZE 4096 | |
| 16 #define SKDEFLATEWSTREAM_OUTPUT_BUFFER_SIZE 4224 // 4096 + 128, usually big | |
| 17 // enough to always do a | |
| 18 // single loop. | |
| 19 | |
| 20 // called by both write() and finalize() | |
| 21 static void do_deflate(int flush, | |
| 22 z_stream* zStream, | |
| 23 SkWStream* out, | |
| 24 unsigned char* inBuffer, | |
| 25 size_t inBufferSize) { | |
| 26 zStream->next_in = inBuffer; | |
| 27 zStream->avail_in = inBufferSize; | |
| 28 unsigned char outBuffer[SKDEFLATEWSTREAM_OUTPUT_BUFFER_SIZE]; | |
| 29 SkDEBUGCODE(int returnValue;) | |
| 30 do { | |
| 31 zStream->next_out = outBuffer; | |
| 32 zStream->avail_out = sizeof(outBuffer); | |
| 33 SkDEBUGCODE(returnValue =) deflate(zStream, flush); | |
| 34 SkASSERT(!zStream->msg); | |
| 35 | |
| 36 out->write(outBuffer, sizeof(outBuffer) - zStream->avail_out); | |
| 37 } while (zStream->avail_in || !zStream->avail_out); | |
| 38 SkASSERT(flush == Z_FINISH | |
| 39 ? returnValue == Z_STREAM_END | |
| 40 : returnValue == Z_OK); | |
| 41 } | |
| 42 | |
| 43 // Hide all zlib impl details. | |
| 44 struct SkDeflateWStream::Impl { | |
| 45 SkWStream* fOut; | |
| 46 unsigned char fInBuffer[SKDEFLATEWSTREAM_INPUT_BUFFER_SIZE]; | |
| 47 size_t fInBufferIndex; | |
| 48 z_stream fZStream; | |
| 49 }; | |
| 50 | |
| 51 SkDeflateWStream::SkDeflateWStream(SkWStream* out) | |
| 52 : fImpl(SkNEW(SkDeflateWStream::Impl)) { | |
| 53 fImpl->fOut = out; | |
| 54 fImpl->fInBufferIndex = 0; | |
| 55 if (!fImpl->fOut) { | |
| 56 return; | |
| 57 } | |
| 58 fImpl->fZStream.zalloc = Z_NULL; | |
| 59 fImpl->fZStream.zfree = Z_NULL; | |
| 60 fImpl->fZStream.opaque = Z_NULL; | |
| 61 fImpl->fZStream.data_type = Z_BINARY; | |
| 62 SkDEBUGCODE(int r =) deflateInit(&fImpl->fZStream, Z_DEFAULT_COMPRESSION); | |
| 63 SkASSERT(Z_OK == r); | |
| 64 } | |
| 65 | |
| 66 SkDeflateWStream::~SkDeflateWStream() { this->finalize(); } | |
| 67 | |
| 68 void SkDeflateWStream::finalize() { | |
| 69 if (!fImpl->fOut) { | |
| 70 return; | |
| 71 } | |
| 72 do_deflate(Z_FINISH, &fImpl->fZStream, fImpl->fOut, fImpl->fInBuffer, | |
| 73 fImpl->fInBufferIndex); | |
| 74 (void)deflateEnd(&fImpl->fZStream); | |
| 75 fImpl->fOut = NULL; | |
| 76 } | |
| 77 | |
| 78 bool SkDeflateWStream::write(const void* void_buffer, size_t len) { | |
| 79 if (!fImpl->fOut) { | |
| 80 return false; | |
| 81 } | |
| 82 const char* buffer = (const char*)void_buffer; | |
| 83 while (len > 0) { | |
| 84 size_t tocopy = | |
| 85 SkTMin(len, sizeof(fImpl->fInBuffer) - fImpl->fInBufferIndex); | |
| 86 memcpy(fImpl->fInBuffer + fImpl->fInBufferIndex, buffer, tocopy); | |
| 87 len -= tocopy; | |
| 88 buffer += tocopy; | |
| 89 fImpl->fInBufferIndex += tocopy; | |
| 90 SkASSERT(fImpl->fInBufferIndex <= sizeof(fImpl->fInBuffer)); | |
| 91 | |
| 92 // if the buffer isn't filled, don't call into zlib yet. | |
| 93 if (sizeof(fImpl->fInBuffer) == fImpl->fInBufferIndex) { | |
| 94 do_deflate(Z_NO_FLUSH, &fImpl->fZStream, fImpl->fOut, | |
| 95 fImpl->fInBuffer, fImpl->fInBufferIndex); | |
| 96 fImpl->fInBufferIndex = 0; | |
| 97 } | |
| 98 } | |
| 99 return true; | |
| 100 } | |
| 101 | |
| 102 size_t SkDeflateWStream::bytesWritten() const { | |
| 103 return fImpl->fZStream.total_in + fImpl->fInBufferIndex; | |
| 104 } | |
| 105 | |
| 106 #endif // SK_NO_ZLIB | |
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Chromium Code Reviews
Issue 957323003:
miniz support in SkFlate / PDF (Closed)
Base URL: https://skia.googlesource.com/skia.git@master