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Overview
Comment: | Add the fileio.c loadable extension, that implements readfile() and writefile() SQL functions. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
0ca104d821d5841ab0754113be074c52 |
User & Date: | drh 2014-06-13 13:43:25.488 |
Context
2014-06-16
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12:44 | Add test cases for the fileio extension. (check-in: 8634333127 user: drh tags: trunk) | |
2014-06-13
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13:43 | Add the fileio.c loadable extension, that implements readfile() and writefile() SQL functions. (check-in: 0ca104d821 user: drh tags: trunk) | |
13:08 | Add an extension that implements compress() and uncompress() SQL functions. (check-in: d5c17d1a42 user: drh tags: trunk) | |
Changes
Added ext/misc/fileio.c.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | /* ** 2014-06-13 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ****************************************************************************** ** ** This SQLite extension implements SQL functions readfile() and ** writefile(). */ #include "sqlite3ext.h" SQLITE_EXTENSION_INIT1 #include <stdio.h> /* ** Implementation of the "readfile(X)" SQL function. The entire content ** of the file named X is read and returned as a BLOB. NULL is returned ** if the file does not exist or is unreadable. */ static void readfileFunc( sqlite3_context *context, int argc, sqlite3_value **argv ){ const char *zName; FILE *in; long nIn; void *pBuf; zName = (const char*)sqlite3_value_text(argv[0]); if( zName==0 ) return; in = fopen(zName, "rb"); if( in==0 ) return; fseek(in, 0, SEEK_END); nIn = ftell(in); rewind(in); pBuf = sqlite3_malloc( nIn ); if( pBuf && 1==fread(pBuf, nIn, 1, in) ){ sqlite3_result_blob(context, pBuf, nIn, sqlite3_free); }else{ sqlite3_free(pBuf); } fclose(in); } /* ** Implementation of the "writefile(X,Y)" SQL function. The argument Y ** is written into file X. The number of bytes written is returned. Or ** NULL is returned if something goes wrong, such as being unable to open ** file X for writing. */ static void writefileFunc( sqlite3_context *context, int argc, sqlite3_value **argv ){ FILE *out; const char *z; int n; long rc; const char *zFile; zFile = (const char*)sqlite3_value_text(argv[0]); if( zFile==0 ) return; out = fopen(zFile, "wb"); if( out==0 ) return; z = (const char*)sqlite3_value_blob(argv[1]); if( z==0 ){ n = 0; rc = 0; }else{ n = sqlite3_value_bytes(argv[1]); rc = fwrite(z, 1, n, out); } fclose(out); sqlite3_result_int64(context, rc); } #ifdef _WIN32 __declspec(dllexport) #endif int sqlite3_fileio_init( sqlite3 *db, char **pzErrMsg, const sqlite3_api_routines *pApi ){ int rc = SQLITE_OK; SQLITE_EXTENSION_INIT2(pApi); (void)pzErrMsg; /* Unused parameter */ rc = sqlite3_create_function(db, "readfile", 1, SQLITE_UTF8, 0, readfileFunc, 0, 0); if( rc==SQLITE_OK ){ rc = sqlite3_create_function(db, "writefile", 2, SQLITE_UTF8, 0, writefileFunc, 0, 0); } return rc; } |