reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1 | /* |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 2 | * Copyright 2006 The Android Open Source Project |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 3 | * |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #ifndef SkStream_DEFINED |
| 9 | #define SkStream_DEFINED |
| 10 | |
reed | fde0511 | 2016-03-11 13:02:28 -0800 | [diff] [blame] | 11 | #include "SkData.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 12 | #include "SkRefCnt.h" |
| 13 | #include "SkScalar.h" |
| 14 | |
Ben Wagner | 4d1955c | 2017-03-10 13:08:15 -0500 | [diff] [blame] | 15 | #include <memory.h> |
| 16 | |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 17 | class SkStream; |
| 18 | class SkStreamRewindable; |
| 19 | class SkStreamSeekable; |
| 20 | class SkStreamAsset; |
| 21 | class SkStreamMemory; |
| 22 | |
reed@google.com | 3b34505 | 2013-05-07 15:59:16 +0000 | [diff] [blame] | 23 | /** |
| 24 | * SkStream -- abstraction for a source of bytes. Subclasses can be backed by |
| 25 | * memory, or a file, or something else. |
| 26 | * |
| 27 | * NOTE: |
| 28 | * |
| 29 | * Classic "streams" APIs are sort of async, in that on a request for N |
| 30 | * bytes, they may return fewer than N bytes on a given call, in which case |
| 31 | * the caller can "try again" to get more bytes, eventually (modulo an error) |
| 32 | * receiving their total N bytes. |
skia.committer@gmail.com | 2b34fe0 | 2013-05-08 07:01:40 +0000 | [diff] [blame] | 33 | * |
reed@google.com | 3b34505 | 2013-05-07 15:59:16 +0000 | [diff] [blame] | 34 | * Skia streams behave differently. They are effectively synchronous, and will |
| 35 | * always return all N bytes of the request if possible. If they return fewer |
| 36 | * (the read() call returns the number of bytes read) then that means there is |
| 37 | * no more data (at EOF or hit an error). The caller should *not* call again |
| 38 | * in hopes of fulfilling more of the request. |
| 39 | */ |
scroggo | a1193e4 | 2015-01-21 12:09:53 -0800 | [diff] [blame] | 40 | class SK_API SkStream : public SkNoncopyable { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 41 | public: |
scroggo | a1193e4 | 2015-01-21 12:09:53 -0800 | [diff] [blame] | 42 | virtual ~SkStream() {} |
| 43 | |
| 44 | /** |
bungeman | f93d711 | 2016-09-16 06:24:20 -0700 | [diff] [blame] | 45 | * Attempts to open the specified file as a stream, returns nullptr on failure. |
reed@google.com | e1575aa | 2013-03-18 21:08:46 +0000 | [diff] [blame] | 46 | */ |
bungeman | f93d711 | 2016-09-16 06:24:20 -0700 | [diff] [blame] | 47 | static std::unique_ptr<SkStreamAsset> MakeFromFile(const char path[]); |
skia.committer@gmail.com | 8eaddb0 | 2013-03-19 07:15:10 +0000 | [diff] [blame] | 48 | |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 49 | /** Reads or skips size number of bytes. |
| 50 | * If buffer == NULL, skip size bytes, return how many were skipped. |
| 51 | * If buffer != NULL, copy size bytes into buffer, return how many were copied. |
| 52 | * @param buffer when NULL skip size bytes, otherwise copy size bytes into buffer |
| 53 | * @param size the number of bytes to skip or copy |
bungeman@google.com | 88682b7 | 2013-07-19 13:55:41 +0000 | [diff] [blame] | 54 | * @return the number of bytes actually read. |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 55 | */ |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 56 | virtual size_t read(void* buffer, size_t size) = 0; |
| 57 | |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 58 | /** Skip size number of bytes. |
| 59 | * @return the actual number bytes that could be skipped. |
| 60 | */ |
| 61 | size_t skip(size_t size) { |
bungeman@google.com | 0430692 | 2013-11-13 19:53:46 +0000 | [diff] [blame] | 62 | return this->read(NULL, size); |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 63 | } |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 64 | |
scroggo | 028a413 | 2015-04-02 13:19:51 -0700 | [diff] [blame] | 65 | /** |
| 66 | * Attempt to peek at size bytes. |
scroggo | d61c384 | 2015-12-07 11:37:13 -0800 | [diff] [blame] | 67 | * If this stream supports peeking, copy min(size, peekable bytes) into |
| 68 | * buffer, and return the number of bytes copied. |
| 69 | * If the stream does not support peeking, or cannot peek any bytes, |
| 70 | * return 0 and leave buffer unchanged. |
scroggo | 028a413 | 2015-04-02 13:19:51 -0700 | [diff] [blame] | 71 | * The stream is guaranteed to be in the same visible state after this |
| 72 | * call, regardless of success or failure. |
scroggo | d61c384 | 2015-12-07 11:37:13 -0800 | [diff] [blame] | 73 | * @param buffer Must not be NULL, and must be at least size bytes. Destination |
| 74 | * to copy bytes. |
scroggo | 028a413 | 2015-04-02 13:19:51 -0700 | [diff] [blame] | 75 | * @param size Number of bytes to copy. |
scroggo | d61c384 | 2015-12-07 11:37:13 -0800 | [diff] [blame] | 76 | * @return The number of bytes peeked/copied. |
scroggo | 028a413 | 2015-04-02 13:19:51 -0700 | [diff] [blame] | 77 | */ |
scroggo | d61c384 | 2015-12-07 11:37:13 -0800 | [diff] [blame] | 78 | virtual size_t peek(void* /*buffer*/, size_t /*size*/) const { return 0; } |
scroggo | 028a413 | 2015-04-02 13:19:51 -0700 | [diff] [blame] | 79 | |
bungeman@google.com | 88682b7 | 2013-07-19 13:55:41 +0000 | [diff] [blame] | 80 | /** Returns true when all the bytes in the stream have been read. |
| 81 | * This may return true early (when there are no more bytes to be read) |
| 82 | * or late (after the first unsuccessful read). |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 83 | */ |
bungeman@google.com | 0430692 | 2013-11-13 19:53:46 +0000 | [diff] [blame] | 84 | virtual bool isAtEnd() const = 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 85 | |
| 86 | int8_t readS8(); |
| 87 | int16_t readS16(); |
| 88 | int32_t readS32(); |
| 89 | |
| 90 | uint8_t readU8() { return (uint8_t)this->readS8(); } |
| 91 | uint16_t readU16() { return (uint16_t)this->readS16(); } |
| 92 | uint32_t readU32() { return (uint32_t)this->readS32(); } |
| 93 | |
| 94 | bool readBool() { return this->readU8() != 0; } |
| 95 | SkScalar readScalar(); |
| 96 | size_t readPackedUInt(); |
robertphillips@google.com | 15e9d3e | 2012-06-21 20:25:03 +0000 | [diff] [blame] | 97 | |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 98 | //SkStreamRewindable |
scroggo@google.com | 4d213ab | 2013-08-28 13:08:54 +0000 | [diff] [blame] | 99 | /** Rewinds to the beginning of the stream. Returns true if the stream is known |
| 100 | * to be at the beginning after this call returns. |
| 101 | */ |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 102 | virtual bool rewind() { return false; } |
| 103 | |
| 104 | /** Duplicates this stream. If this cannot be done, returns NULL. |
| 105 | * The returned stream will be positioned at the beginning of its data. |
| 106 | */ |
| 107 | virtual SkStreamRewindable* duplicate() const { return NULL; } |
| 108 | |
| 109 | //SkStreamSeekable |
| 110 | /** Returns true if this stream can report it's current position. */ |
| 111 | virtual bool hasPosition() const { return false; } |
| 112 | /** Returns the current position in the stream. If this cannot be done, returns 0. */ |
| 113 | virtual size_t getPosition() const { return 0; } |
| 114 | |
| 115 | /** Seeks to an absolute position in the stream. If this cannot be done, returns false. |
| 116 | * If an attempt is made to seek past the end of the stream, the position will be set |
| 117 | * to the end of the stream. |
| 118 | */ |
djsollen | c87dd2c | 2014-11-14 11:11:46 -0800 | [diff] [blame] | 119 | virtual bool seek(size_t /*position*/) { return false; } |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 120 | |
| 121 | /** Seeks to an relative offset in the stream. If this cannot be done, returns false. |
| 122 | * If an attempt is made to move to a position outside the stream, the position will be set |
| 123 | * to the closest point within the stream (beginning or end). |
| 124 | */ |
djsollen | c87dd2c | 2014-11-14 11:11:46 -0800 | [diff] [blame] | 125 | virtual bool move(long /*offset*/) { return false; } |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 126 | |
| 127 | /** Duplicates this stream. If this cannot be done, returns NULL. |
| 128 | * The returned stream will be positioned the same as this stream. |
| 129 | */ |
| 130 | virtual SkStreamSeekable* fork() const { return NULL; } |
| 131 | |
| 132 | //SkStreamAsset |
| 133 | /** Returns true if this stream can report it's total length. */ |
| 134 | virtual bool hasLength() const { return false; } |
| 135 | /** Returns the total length of the stream. If this cannot be done, returns 0. */ |
bungeman@google.com | 0430692 | 2013-11-13 19:53:46 +0000 | [diff] [blame] | 136 | virtual size_t getLength() const { return 0; } |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 137 | |
| 138 | //SkStreamMemory |
| 139 | /** Returns the starting address for the data. If this cannot be done, returns NULL. */ |
| 140 | //TODO: replace with virtual const SkData* getData() |
| 141 | virtual const void* getMemoryBase() { return NULL; } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 142 | }; |
| 143 | |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 144 | /** SkStreamRewindable is a SkStream for which rewind and duplicate are required. */ |
| 145 | class SK_API SkStreamRewindable : public SkStream { |
| 146 | public: |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 147 | bool rewind() override = 0; |
| 148 | SkStreamRewindable* duplicate() const override = 0; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 149 | }; |
| 150 | |
| 151 | /** SkStreamSeekable is a SkStreamRewindable for which position, seek, move, and fork are required. */ |
| 152 | class SK_API SkStreamSeekable : public SkStreamRewindable { |
| 153 | public: |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 154 | SkStreamSeekable* duplicate() const override = 0; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 155 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 156 | bool hasPosition() const override { return true; } |
| 157 | size_t getPosition() const override = 0; |
| 158 | bool seek(size_t position) override = 0; |
| 159 | bool move(long offset) override = 0; |
| 160 | SkStreamSeekable* fork() const override = 0; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 161 | }; |
| 162 | |
| 163 | /** SkStreamAsset is a SkStreamSeekable for which getLength is required. */ |
| 164 | class SK_API SkStreamAsset : public SkStreamSeekable { |
| 165 | public: |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 166 | SkStreamAsset* duplicate() const override = 0; |
| 167 | SkStreamAsset* fork() const override = 0; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 168 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 169 | bool hasLength() const override { return true; } |
| 170 | size_t getLength() const override = 0; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 171 | }; |
| 172 | |
| 173 | /** SkStreamMemory is a SkStreamAsset for which getMemoryBase is required. */ |
| 174 | class SK_API SkStreamMemory : public SkStreamAsset { |
| 175 | public: |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 176 | SkStreamMemory* duplicate() const override = 0; |
| 177 | SkStreamMemory* fork() const override = 0; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 178 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 179 | const void* getMemoryBase() override = 0; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 180 | }; |
| 181 | |
ctguil@chromium.org | dfc5ffe | 2011-03-30 20:14:49 +0000 | [diff] [blame] | 182 | class SK_API SkWStream : SkNoncopyable { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 183 | public: |
| 184 | virtual ~SkWStream(); |
| 185 | |
| 186 | /** Called to write bytes to a SkWStream. Returns true on success |
| 187 | @param buffer the address of at least size bytes to be written to the stream |
| 188 | @param size The number of bytes in buffer to write to the stream |
| 189 | @return true on success |
| 190 | */ |
| 191 | virtual bool write(const void* buffer, size_t size) = 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 192 | virtual void flush(); |
| 193 | |
commit-bot@chromium.org | 490fb6b | 2014-03-06 17:16:26 +0000 | [diff] [blame] | 194 | virtual size_t bytesWritten() const = 0; |
| 195 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 196 | // helpers |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 197 | |
Mike Reed | 9c457ad | 2016-12-15 14:11:37 -0500 | [diff] [blame] | 198 | bool write8(U8CPU value) { |
| 199 | uint8_t v = SkToU8(value); |
| 200 | return this->write(&v, 1); |
| 201 | } |
| 202 | bool write16(U16CPU value) { |
| 203 | uint16_t v = SkToU16(value); |
| 204 | return this->write(&v, 2); |
| 205 | } |
| 206 | bool write32(uint32_t v) { |
| 207 | return this->write(&v, 4); |
| 208 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 209 | |
Mike Reed | 9c457ad | 2016-12-15 14:11:37 -0500 | [diff] [blame] | 210 | bool writeText(const char text[]) { |
halcanary | cbc060a | 2016-04-11 19:41:48 -0700 | [diff] [blame] | 211 | SkASSERT(text); |
| 212 | return this->write(text, strlen(text)); |
| 213 | } |
Mike Reed | c3063e5 | 2017-01-07 16:16:02 -0500 | [diff] [blame] | 214 | |
| 215 | bool newline() { return this->write("\n", strlen("\n")); } |
| 216 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 217 | bool writeDecAsText(int32_t); |
vandebo@chromium.org | d877fdb | 2010-10-12 23:08:13 +0000 | [diff] [blame] | 218 | bool writeBigDecAsText(int64_t, int minDigits = 0); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 219 | bool writeHexAsText(uint32_t, int minDigits = 0); |
| 220 | bool writeScalarAsText(SkScalar); |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 221 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 222 | bool writeBool(bool v) { return this->write8(v); } |
| 223 | bool writeScalar(SkScalar); |
| 224 | bool writePackedUInt(size_t); |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 225 | |
commit-bot@chromium.org | dcb8e54 | 2014-03-05 18:25:20 +0000 | [diff] [blame] | 226 | bool writeStream(SkStream* input, size_t length); |
reed@google.com | 8a85d0c | 2011-06-24 19:12:12 +0000 | [diff] [blame] | 227 | |
epoger@google.com | 8e3fb2d | 2013-03-20 15:56:03 +0000 | [diff] [blame] | 228 | /** |
commit-bot@chromium.org | dcb8e54 | 2014-03-05 18:25:20 +0000 | [diff] [blame] | 229 | * This returns the number of bytes in the stream required to store |
| 230 | * 'value'. |
| 231 | */ |
| 232 | static int SizeOfPackedUInt(size_t value); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 233 | }; |
| 234 | |
Mike Reed | 2a65cc0 | 2017-03-22 10:01:53 -0400 | [diff] [blame] | 235 | class SK_API SkNullWStream : public SkWStream { |
| 236 | public: |
| 237 | SkNullWStream() : fBytesWritten(0) {} |
| 238 | |
| 239 | bool write(const void*, size_t n) override { fBytesWritten += n; return true; } |
| 240 | void flush() override {} |
| 241 | size_t bytesWritten() const override { return fBytesWritten; } |
| 242 | |
| 243 | private: |
| 244 | size_t fBytesWritten; |
| 245 | }; |
| 246 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 247 | //////////////////////////////////////////////////////////////////////////////////////// |
| 248 | |
bungeman@google.com | fab44db | 2013-10-11 18:50:45 +0000 | [diff] [blame] | 249 | #include <stdio.h> |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 250 | |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 251 | /** A stream that wraps a C FILE* file stream. */ |
| 252 | class SK_API SkFILEStream : public SkStreamAsset { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 253 | public: |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 254 | /** Initialize the stream by calling sk_fopen on the specified path. |
| 255 | * This internal stream will be closed in the destructor. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 256 | */ |
Ben Wagner | 4d1955c | 2017-03-10 13:08:15 -0500 | [diff] [blame] | 257 | explicit SkFILEStream(const char path[] = nullptr); |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 258 | |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 259 | /** Initialize the stream with an existing C file stream. |
Ben Wagner | 4d1955c | 2017-03-10 13:08:15 -0500 | [diff] [blame] | 260 | * The C file stream will be closed in the destructor. |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 261 | */ |
Ben Wagner | 4d1955c | 2017-03-10 13:08:15 -0500 | [diff] [blame] | 262 | explicit SkFILEStream(FILE* file); |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 263 | |
Brian Salomon | d3b6597 | 2017-03-22 12:05:03 -0400 | [diff] [blame] | 264 | ~SkFILEStream() override; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 265 | |
Mike Reed | 847068c | 2017-07-26 11:35:53 -0400 | [diff] [blame^] | 266 | static std::unique_ptr<SkFILEStream> Make(const char path[]) { |
| 267 | SkFILEStream* stream = new SkFILEStream(path); |
| 268 | return stream->isValid() ? std::unique_ptr<SkFILEStream>(stream) : nullptr; |
| 269 | } |
| 270 | |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 271 | /** Returns true if the current path could be opened. */ |
Ben Wagner | 4d1955c | 2017-03-10 13:08:15 -0500 | [diff] [blame] | 272 | bool isValid() const { return fFILE != nullptr; } |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 273 | |
Ben Wagner | 4d1955c | 2017-03-10 13:08:15 -0500 | [diff] [blame] | 274 | /** Close this SkFILEStream. */ |
| 275 | void close(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 276 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 277 | size_t read(void* buffer, size_t size) override; |
| 278 | bool isAtEnd() const override; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 279 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 280 | bool rewind() override; |
| 281 | SkStreamAsset* duplicate() const override; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 282 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 283 | size_t getPosition() const override; |
| 284 | bool seek(size_t position) override; |
| 285 | bool move(long offset) override; |
| 286 | SkStreamAsset* fork() const override; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 287 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 288 | size_t getLength() const override; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 289 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 290 | private: |
Ben Wagner | 4d1955c | 2017-03-10 13:08:15 -0500 | [diff] [blame] | 291 | explicit SkFILEStream(std::shared_ptr<FILE>, size_t size, size_t offset); |
| 292 | explicit SkFILEStream(std::shared_ptr<FILE>, size_t size, size_t offset, size_t originalOffset); |
| 293 | |
| 294 | std::shared_ptr<FILE> fFILE; |
| 295 | // My own council will I keep on sizes and offsets. |
| 296 | size_t fSize; |
| 297 | size_t fOffset; |
| 298 | size_t fOriginalOffset; |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 299 | |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 300 | typedef SkStreamAsset INHERITED; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 301 | }; |
| 302 | |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 303 | class SK_API SkMemoryStream : public SkStreamMemory { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 304 | public: |
| 305 | SkMemoryStream(); |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 306 | |
| 307 | /** We allocate (and free) the memory. Write to it via getMemoryBase() */ |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 308 | SkMemoryStream(size_t length); |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 309 | |
| 310 | /** If copyData is true, the stream makes a private copy of the data. */ |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 311 | SkMemoryStream(const void* data, size_t length, bool copyData = false); |
scroggo@google.com | e490420 | 2013-01-09 22:02:58 +0000 | [diff] [blame] | 312 | |
reed | fde0511 | 2016-03-11 13:02:28 -0800 | [diff] [blame] | 313 | /** Creates the stream to read from the specified data */ |
| 314 | SkMemoryStream(sk_sp<SkData>); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 315 | |
Mike Reed | 847068c | 2017-07-26 11:35:53 -0400 | [diff] [blame^] | 316 | /** Returns a stream with a copy of the input data. */ |
| 317 | static std::unique_ptr<SkMemoryStream> MakeCopy(const void* data, size_t length); |
| 318 | |
| 319 | /** Returns a stream with a bare pointer reference to the input data. */ |
| 320 | static std::unique_ptr<SkMemoryStream> MakeDirect(const void* data, size_t length); |
| 321 | |
| 322 | /** Returns a stream with a shared reference to the input data. */ |
| 323 | static std::unique_ptr<SkMemoryStream> Make(sk_sp<SkData> data); |
| 324 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 325 | /** Resets the stream to the specified data and length, |
| 326 | just like the constructor. |
| 327 | if copyData is true, the stream makes a private copy of the data |
| 328 | */ |
| 329 | virtual void setMemory(const void* data, size_t length, |
| 330 | bool copyData = false); |
djsollen@google.com | 57f4969 | 2011-02-23 20:46:31 +0000 | [diff] [blame] | 331 | /** Replace any memory buffer with the specified buffer. The caller |
| 332 | must have allocated data with sk_malloc or sk_realloc, since it |
| 333 | will be freed with sk_free. |
| 334 | */ |
| 335 | void setMemoryOwned(const void* data, size_t length); |
reed@google.com | 8a85d0c | 2011-06-24 19:12:12 +0000 | [diff] [blame] | 336 | |
reed | 42943c8 | 2016-09-12 12:01:44 -0700 | [diff] [blame] | 337 | sk_sp<SkData> asData() const { return fData; } |
| 338 | void setData(sk_sp<SkData>); |
reed@google.com | 8a85d0c | 2011-06-24 19:12:12 +0000 | [diff] [blame] | 339 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 340 | void skipToAlign4(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 341 | const void* getAtPos(); |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 342 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 343 | size_t read(void* buffer, size_t size) override; |
| 344 | bool isAtEnd() const override; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 345 | |
scroggo | d61c384 | 2015-12-07 11:37:13 -0800 | [diff] [blame] | 346 | size_t peek(void* buffer, size_t size) const override; |
scroggo | 028a413 | 2015-04-02 13:19:51 -0700 | [diff] [blame] | 347 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 348 | bool rewind() override; |
| 349 | SkMemoryStream* duplicate() const override; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 350 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 351 | size_t getPosition() const override; |
| 352 | bool seek(size_t position) override; |
| 353 | bool move(long offset) override; |
| 354 | SkMemoryStream* fork() const override; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 355 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 356 | size_t getLength() const override; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 357 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 358 | const void* getMemoryBase() override; |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 359 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 360 | private: |
reed | fde0511 | 2016-03-11 13:02:28 -0800 | [diff] [blame] | 361 | sk_sp<SkData> fData; |
| 362 | size_t fOffset; |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 363 | |
bungeman@google.com | 6cab1a4 | 2013-05-29 13:43:31 +0000 | [diff] [blame] | 364 | typedef SkStreamMemory INHERITED; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 365 | }; |
| 366 | |
| 367 | ///////////////////////////////////////////////////////////////////////////////////////////// |
| 368 | |
alokp@chromium.org | f7751ae | 2012-07-17 19:10:36 +0000 | [diff] [blame] | 369 | class SK_API SkFILEWStream : public SkWStream { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 370 | public: |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 371 | SkFILEWStream(const char path[]); |
Brian Salomon | d3b6597 | 2017-03-22 12:05:03 -0400 | [diff] [blame] | 372 | ~SkFILEWStream() override; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 373 | |
| 374 | /** Returns true if the current path could be opened. |
| 375 | */ |
| 376 | bool isValid() const { return fFILE != NULL; } |
| 377 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 378 | bool write(const void* buffer, size_t size) override; |
| 379 | void flush() override; |
caryclark | 7471fa4 | 2015-12-16 13:41:23 -0800 | [diff] [blame] | 380 | void fsync(); |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 381 | size_t bytesWritten() const override; |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 382 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 383 | private: |
halcanary | d76be9c | 2015-11-20 13:47:49 -0800 | [diff] [blame] | 384 | FILE* fFILE; |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 385 | |
| 386 | typedef SkWStream INHERITED; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 387 | }; |
| 388 | |
ctguil@chromium.org | dfc5ffe | 2011-03-30 20:14:49 +0000 | [diff] [blame] | 389 | class SK_API SkDynamicMemoryWStream : public SkWStream { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 390 | public: |
| 391 | SkDynamicMemoryWStream(); |
Brian Salomon | d3b6597 | 2017-03-22 12:05:03 -0400 | [diff] [blame] | 392 | ~SkDynamicMemoryWStream() override; |
reed@google.com | 8a85d0c | 2011-06-24 19:12:12 +0000 | [diff] [blame] | 393 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 394 | bool write(const void* buffer, size_t size) override; |
Mike Reed | 9c457ad | 2016-12-15 14:11:37 -0500 | [diff] [blame] | 395 | size_t bytesWritten() const override; |
Ben Wagner | 884300d | 2016-12-16 16:51:41 +0000 | [diff] [blame] | 396 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 397 | bool read(void* buffer, size_t offset, size_t size); |
Mike Reed | 9c457ad | 2016-12-15 14:11:37 -0500 | [diff] [blame] | 398 | |
Ben Wagner | 884300d | 2016-12-16 16:51:41 +0000 | [diff] [blame] | 399 | /** More efficient version of read(dst, 0, bytesWritten()). */ |
reed@google.com | 8a85d0c | 2011-06-24 19:12:12 +0000 | [diff] [blame] | 400 | void copyTo(void* dst) const; |
Hal Canary | 6fee59b | 2017-05-23 11:47:05 -0400 | [diff] [blame] | 401 | bool writeToStream(SkWStream* dst) const; |
reed@google.com | 70442a6 | 2011-06-23 21:48:04 +0000 | [diff] [blame] | 402 | |
Hal Canary | dabe8ac | 2017-03-14 15:52:12 -0400 | [diff] [blame] | 403 | /** Equivalent to copyTo() followed by reset(), but may save memory use. */ |
| 404 | void copyToAndReset(void* dst); |
| 405 | |
Hal Canary | 6fee59b | 2017-05-23 11:47:05 -0400 | [diff] [blame] | 406 | /** Equivalent to writeToStream() followed by reset(), but may save memory use. */ |
| 407 | bool writeToAndReset(SkWStream* dst); |
| 408 | |
Ben Wagner | 884300d | 2016-12-16 16:51:41 +0000 | [diff] [blame] | 409 | /** Return the contents as SkData, and then reset the stream. */ |
reed | 42943c8 | 2016-09-12 12:01:44 -0700 | [diff] [blame] | 410 | sk_sp<SkData> detachAsData(); |
reed@google.com | 70442a6 | 2011-06-23 21:48:04 +0000 | [diff] [blame] | 411 | |
bungeman@google.com | 88682b7 | 2013-07-19 13:55:41 +0000 | [diff] [blame] | 412 | /** Reset, returning a reader stream with the current content. */ |
Hal Canary | 0b83319 | 2017-03-14 14:35:02 -0400 | [diff] [blame] | 413 | std::unique_ptr<SkStreamAsset> detachAsStream(); |
bungeman@google.com | 88682b7 | 2013-07-19 13:55:41 +0000 | [diff] [blame] | 414 | |
| 415 | /** Reset the stream to its original, empty, state. */ |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 416 | void reset(); |
| 417 | void padToAlign4(); |
| 418 | private: |
| 419 | struct Block; |
| 420 | Block* fHead; |
| 421 | Block* fTail; |
Mike Reed | 9c457ad | 2016-12-15 14:11:37 -0500 | [diff] [blame] | 422 | size_t fBytesWrittenBeforeTail; |
| 423 | |
| 424 | #ifdef SK_DEBUG |
| 425 | void validate() const; |
| 426 | #else |
| 427 | void validate() const {} |
| 428 | #endif |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 429 | |
bungeman@google.com | 88682b7 | 2013-07-19 13:55:41 +0000 | [diff] [blame] | 430 | // For access to the Block type. |
| 431 | friend class SkBlockMemoryStream; |
| 432 | friend class SkBlockMemoryRefCnt; |
| 433 | |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 434 | typedef SkWStream INHERITED; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 435 | }; |
| 436 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 437 | #endif |