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| 1 | |
| 2 /* | |
| 3 * Copyright 2011 Google Inc. | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 #include "SkStream.h" | |
| 9 | |
| 10 #ifdef SK_BUILD_FOR_WIN | |
| 11 | |
| 12 // -1 means isValid() will return false | |
| 13 SkFDStream::SkFDStream(int, bool) : fFD(-1), fCloseWhenDone(false) {} | |
| 14 SkFDStream::~SkFDStream() {} | |
| 15 bool SkFDStream::rewind() { return false; } | |
| 16 size_t SkFDStream::read(void*, size_t) { return 0; } | |
| 17 | |
| 18 #else | |
| 19 | |
| 20 #include <unistd.h> | |
| 21 | |
| 22 //#define TRACE_FDSTREAM | |
| 23 | |
| 24 SkFDStream::SkFDStream(int fileDesc, bool closeWhenDone) | |
| 25 : fFD(fileDesc), fCloseWhenDone(closeWhenDone) { | |
| 26 } | |
| 27 | |
| 28 SkFDStream::~SkFDStream() { | |
| 29 if (fFD >= 0 && fCloseWhenDone) { | |
| 30 ::close(fFD); | |
| 31 } | |
| 32 } | |
| 33 | |
| 34 bool SkFDStream::rewind() { | |
| 35 if (fFD >= 0) { | |
| 36 off_t value = ::lseek(fFD, 0, SEEK_SET); | |
| 37 #ifdef TRACE_FDSTREAM | |
| 38 if (value) { | |
| 39 SkDebugf("xxxxxxxxxxxxxx rewind failed %d\n", value); | |
| 40 } | |
| 41 #endif | |
| 42 return value == 0; | |
| 43 } | |
| 44 return false; | |
| 45 } | |
| 46 | |
| 47 size_t SkFDStream::read(void* buffer, size_t size) { | |
| 48 if (fFD >= 0) { | |
| 49 if (buffer == NULL && size == 0) { // request total size | |
| 50 off_t curr = ::lseek(fFD, 0, SEEK_CUR); | |
| 51 if (curr < 0) { | |
| 52 #ifdef TRACE_FDSTREAM | |
| 53 SkDebugf("xxxxxxxxxxxxx lseek failed 0 CURR\n"); | |
| 54 #endif | |
| 55 return 0; // error | |
| 56 } | |
| 57 off_t size = ::lseek(fFD, 0, SEEK_END); | |
| 58 if (size < 0) { | |
| 59 #ifdef TRACE_FDSTREAM | |
| 60 SkDebugf("xxxxxxxxxxxxx lseek failed 0 END\n"); | |
| 61 #endif | |
| 62 size = 0; // error | |
| 63 } | |
| 64 if (::lseek(fFD, curr, SEEK_SET) != curr) { | |
| 65 // can't restore, error | |
| 66 #ifdef TRACE_FDSTREAM | |
| 67 SkDebugf("xxxxxxxxxxxxx lseek failed %d SET\n", curr); | |
| 68 #endif | |
| 69 return 0; | |
| 70 } | |
| 71 return (size_t) size; | |
| 72 } else if (NULL == buffer) { // skip | |
| 73 off_t oldCurr = ::lseek(fFD, 0, SEEK_CUR); | |
| 74 if (oldCurr < 0) { | |
| 75 #ifdef TRACE_FDSTREAM | |
| 76 SkDebugf("xxxxxxxxxxxxx lseek1 failed %d CUR\n", oldCurr); | |
| 77 #endif | |
| 78 return 0; // error; | |
| 79 } | |
| 80 off_t newCurr = ::lseek(fFD, size, SEEK_CUR); | |
| 81 if (newCurr < 0) { | |
| 82 #ifdef TRACE_FDSTREAM | |
| 83 SkDebugf("xxxxxxxxxxxxx lseek2 failed %d CUR\n", newCurr); | |
| 84 #endif | |
| 85 return 0; // error; | |
| 86 } | |
| 87 // return the actual amount we skipped | |
| 88 return (size_t) (newCurr - oldCurr); | |
| 89 } else { // read | |
| 90 ssize_t actual = ::read(fFD, buffer, size); | |
| 91 // our API can't return an error, so we return 0 | |
| 92 if (actual < 0) { | |
| 93 #ifdef TRACE_FDSTREAM | |
| 94 SkDebugf("xxxxxxxxxxxxx read failed %d actual %d\n", size, actua
l); | |
| 95 #endif | |
| 96 actual = 0; | |
| 97 } | |
| 98 return actual; | |
| 99 } | |
| 100 } | |
| 101 return 0; | |
| 102 } | |
| 103 | |
| 104 #endif | |
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