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| (Empty) |
| 1 #include "SkStream.h" | |
| 2 #include <unistd.h> | |
| 3 | |
| 4 //#define TRACE_FDSTREAM | |
| 5 | |
| 6 SkFDStream::SkFDStream(int fileDesc, bool closeWhenDone) | |
| 7 : fFD(fileDesc), fCloseWhenDone(closeWhenDone) { | |
| 8 } | |
| 9 | |
| 10 SkFDStream::~SkFDStream() { | |
| 11 if (fFD >= 0 && fCloseWhenDone) { | |
| 12 ::close(fFD); | |
| 13 } | |
| 14 } | |
| 15 | |
| 16 bool SkFDStream::rewind() { | |
| 17 if (fFD >= 0) { | |
| 18 off_t value = ::lseek(fFD, 0, SEEK_SET); | |
| 19 #ifdef TRACE_FDSTREAM | |
| 20 if (value) { | |
| 21 SkDebugf("xxxxxxxxxxxxxx rewind failed %d\n", value); | |
| 22 } | |
| 23 #endif | |
| 24 return value == 0; | |
| 25 } | |
| 26 return false; | |
| 27 } | |
| 28 | |
| 29 size_t SkFDStream::read(void* buffer, size_t size) { | |
| 30 if (fFD >= 0) { | |
| 31 if (buffer == NULL && size == 0) { // request total size | |
| 32 off_t curr = ::lseek(fFD, 0, SEEK_CUR); | |
| 33 if (curr < 0) { | |
| 34 #ifdef TRACE_FDSTREAM | |
| 35 SkDebugf("xxxxxxxxxxxxx lseek failed 0 CURR\n"); | |
| 36 #endif | |
| 37 return 0; // error | |
| 38 } | |
| 39 off_t size = ::lseek(fFD, 0, SEEK_END); | |
| 40 if (size < 0) { | |
| 41 #ifdef TRACE_FDSTREAM | |
| 42 SkDebugf("xxxxxxxxxxxxx lseek failed 0 END\n"); | |
| 43 #endif | |
| 44 size = 0; // error | |
| 45 } | |
| 46 if (::lseek(fFD, curr, SEEK_SET) != curr) { | |
| 47 // can't restore, error | |
| 48 #ifdef TRACE_FDSTREAM | |
| 49 SkDebugf("xxxxxxxxxxxxx lseek failed %d SET\n", curr); | |
| 50 #endif | |
| 51 return 0; | |
| 52 } | |
| 53 return size; | |
| 54 } else if (NULL == buffer) { // skip | |
| 55 off_t oldCurr = ::lseek(fFD, 0, SEEK_CUR); | |
| 56 if (oldCurr < 0) { | |
| 57 #ifdef TRACE_FDSTREAM | |
| 58 SkDebugf("xxxxxxxxxxxxx lseek1 failed %d CUR\n", oldCurr); | |
| 59 #endif | |
| 60 return 0; // error; | |
| 61 } | |
| 62 off_t newCurr = ::lseek(fFD, size, SEEK_CUR); | |
| 63 if (newCurr < 0) { | |
| 64 #ifdef TRACE_FDSTREAM | |
| 65 SkDebugf("xxxxxxxxxxxxx lseek2 failed %d CUR\n", newCurr); | |
| 66 #endif | |
| 67 return 0; // error; | |
| 68 } | |
| 69 // return the actual amount we skipped | |
| 70 return newCurr - oldCurr; | |
| 71 } else { // read | |
| 72 ssize_t actual = ::read(fFD, buffer, size); | |
| 73 // our API can't return an error, so we return 0 | |
| 74 if (actual < 0) { | |
| 75 #ifdef TRACE_FDSTREAM | |
| 76 SkDebugf("xxxxxxxxxxxxx read failed %d actual %d\n", size, actua
l); | |
| 77 #endif | |
| 78 actual = 0; | |
| 79 } | |
| 80 return actual; | |
| 81 } | |
| 82 } | |
| 83 return 0; | |
| 84 } | |
| 85 | |
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Chromium Code Reviews
Issue 113827:
Remove the remainder of the skia source code from the Chromium repo.... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/