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      1 /* libs/graphics/ports/SkOSFile_stdio.cpp
      2 **
      3 ** Copyright 2006, The Android Open Source Project
      4 **
      5 ** Licensed under the Apache License, Version 2.0 (the "License");
      6 ** you may not use this file except in compliance with the License.
      7 ** You may obtain a copy of the License at
      8 **
      9 **     http://www.apache.org/licenses/LICENSE-2.0
     10 **
     11 ** Unless required by applicable law or agreed to in writing, software
     12 ** distributed under the License is distributed on an "AS IS" BASIS,
     13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 ** See the License for the specific language governing permissions and
     15 ** limitations under the License.
     16 */
     17 
     18 #include "SkOSFile.h"
     19 
     20 #include <stdio.h>
     21 #include <errno.h>
     22 
     23 SkFILE* sk_fopen(const char path[], SkFILE_Flags flags)
     24 {
     25     char    perm[4];
     26     char*   p = perm;
     27 
     28     if (flags & kRead_SkFILE_Flag)
     29         *p++ = 'r';
     30     if (flags & kWrite_SkFILE_Flag)
     31         *p++ = 'w';
     32     *p++ = 'b';
     33     *p = 0;
     34 
     35     SkFILE* f = (SkFILE*)::fopen(path, perm);
     36 #if 0
     37     if (NULL == f)
     38         SkDebugf("sk_fopen failed for %s (%s), errno=%s\n", path, perm, strerror(errno));
     39 #endif
     40     return f;
     41 }
     42 
     43 size_t sk_fgetsize(SkFILE* f)
     44 {
     45     SkASSERT(f);
     46 
     47     size_t  curr = ::ftell((FILE*)f);       // remember where we are
     48     ::fseek((FILE*)f, 0, SEEK_END);         // go to the end
     49     size_t size = ::ftell((FILE*)f);        // record the size
     50     ::fseek((FILE*)f, (long)curr, SEEK_SET);        // go back to our prev loc
     51     return size;
     52 }
     53 
     54 bool sk_frewind(SkFILE* f)
     55 {
     56     SkASSERT(f);
     57     ::rewind((FILE*)f);
     58 //  ::fseek((FILE*)f, 0, SEEK_SET);
     59     return true;
     60 }
     61 
     62 size_t sk_fread(void* buffer, size_t byteCount, SkFILE* f)
     63 {
     64     SkASSERT(f);
     65     if (buffer == NULL)
     66     {
     67         size_t curr = ::ftell((FILE*)f);
     68         if ((long)curr == -1) {
     69             SkDEBUGF(("sk_fread: ftell(%p) returned -1 feof:%d ferror:%d\n", f, feof((FILE*)f), ferror((FILE*)f)));
     70             return 0;
     71         }
     72     //  ::fseek((FILE*)f, (long)(curr + byteCount), SEEK_SET);
     73         int err = ::fseek((FILE*)f, (long)byteCount, SEEK_CUR);
     74         if (err != 0) {
     75             SkDEBUGF(("sk_fread: fseek(%d) tell:%d failed with feof:%d ferror:%d returned:%d\n",
     76                         byteCount, curr, feof((FILE*)f), ferror((FILE*)f), err));
     77             return 0;
     78         }
     79         return byteCount;
     80     }
     81     else
     82         return ::fread(buffer, 1, byteCount, (FILE*)f);
     83 }
     84 
     85 size_t sk_fwrite(const void* buffer, size_t byteCount, SkFILE* f)
     86 {
     87     SkASSERT(f);
     88     return ::fwrite(buffer, 1, byteCount, (FILE*)f);
     89 }
     90 
     91 void sk_fflush(SkFILE* f)
     92 {
     93     SkASSERT(f);
     94     ::fflush((FILE*)f);
     95 }
     96 
     97 void sk_fclose(SkFILE* f)
     98 {
     99     SkASSERT(f);
    100     ::fclose((FILE*)f);
    101 }
    102 
    103