101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
/*
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** 2014-06-13
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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******************************************************************************
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**
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** This SQLite extension implements SQL functions readfile() and
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** writefile().
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*/
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#include "sqlite3ext.h"
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SQLITE_EXTENSION_INIT1
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#include <stdio.h>
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/*
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** Implementation of the "readfile(X)" SQL function. The entire content
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** of the file named X is read and returned as a BLOB. NULL is returned
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** if the file does not exist or is unreadable.
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*/
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static void readfileFunc(
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sqlite3_context *context,
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int argc,
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sqlite3_value **argv
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){
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const char *zName;
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FILE *in;
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long nIn;
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void *pBuf;
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zName = (const char*)sqlite3_value_text(argv[0]);
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if( zName==0 ) return;
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in = fopen(zName, "rb");
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if( in==0 ) return;
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fseek(in, 0, SEEK_END);
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nIn = ftell(in);
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rewind(in);
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pBuf = sqlite3_malloc( nIn );
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if( pBuf && 1==fread(pBuf, nIn, 1, in) ){
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sqlite3_result_blob(context, pBuf, nIn, sqlite3_free);
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}else{
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sqlite3_free(pBuf);
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}
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fclose(in);
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}
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/*
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** Implementation of the "writefile(X,Y)" SQL function. The argument Y
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** is written into file X. The number of bytes written is returned. Or
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** NULL is returned if something goes wrong, such as being unable to open
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** file X for writing.
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*/
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static void writefileFunc(
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sqlite3_context *context,
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int argc,
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sqlite3_value **argv
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){
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FILE *out;
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const char *z;
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sqlite3_int64 rc;
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const char *zFile;
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zFile = (const char*)sqlite3_value_text(argv[0]);
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if( zFile==0 ) return;
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out = fopen(zFile, "wb");
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if( out==0 ) return;
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z = (const char*)sqlite3_value_blob(argv[1]);
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if( z==0 ){
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rc = 0;
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}else{
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rc = fwrite(z, 1, sqlite3_value_bytes(argv[1]), out);
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}
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fclose(out);
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sqlite3_result_int64(context, rc);
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}
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#ifdef _WIN32
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__declspec(dllexport)
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#endif
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int sqlite3_fileio_init(
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sqlite3 *db,
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char **pzErrMsg,
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const sqlite3_api_routines *pApi
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){
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int rc = SQLITE_OK;
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SQLITE_EXTENSION_INIT2(pApi);
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(void)pzErrMsg; /* Unused parameter */
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rc = sqlite3_create_function(db, "readfile", 1, SQLITE_UTF8, 0,
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readfileFunc, 0, 0);
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if( rc==SQLITE_OK ){
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rc = sqlite3_create_function(db, "writefile", 2, SQLITE_UTF8, 0,
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writefileFunc, 0, 0);
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}
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return rc;
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}
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