File.cpp

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/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * Written (W) 1999-2010 Soeren Sonnenburg
 * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 * Copyright (C) 2010 Berlin Institute of Technology
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <shogun/io/File.h>

#include <shogun/features/StringFeatures.h>
#include <shogun/features/SparseFeatures.h>

using namespace shogun;

CFile::CFile() : CSGObject()
{
    file=NULL;
    filename=NULL;
    variable_name=NULL;
}

CFile::CFile(FILE* f, const char* name) : CSGObject()
{
    file=f;
    filename=NULL;
    variable_name=NULL;

    if (name)
        set_variable_name(name);
}

CFile::CFile(const char* fname, char rw, const char* name) : CSGObject()
{
    variable_name=NULL;
    task=rw;
    filename=strdup(fname);
    char mode[2];
    mode[0]=rw;
    mode[1]='\0';

    if (rw=='r' || rw == 'w')
    {
        if (filename)
        {
            if (!(file=fopen((const char*) filename, (const char*) mode)))
                SG_ERROR("Error opening file '%s'\n", filename);
        }
    }
    else
        SG_ERROR("unknown mode '%c'\n", mode[0]);

    if (name)
        set_variable_name(name);
}

void CFile::get_vector(bool*& vector, int32_t& len)
{
    int32_t* int_vector;
    get_vector(int_vector, len);

    ASSERT(len>0);
    vector= SG_MALLOC(bool, len);

    for (int32_t i=0; i<len; i++)
        vector[i]= (int_vector[i]!=0);

    SG_FREE(int_vector);
}

void CFile::set_vector(const bool* vector, int32_t len)
{
    int32_t* int_vector = SG_MALLOC(int32_t, len);
    for (int32_t i=0;i<len;i++)
    {
        if (vector[i])
            int_vector[i]=1;
        else
            int_vector[i]=0;
    }
    set_vector(int_vector,len);
    SG_FREE(int_vector);
}

void CFile::get_matrix(bool*& matrix, int32_t& num_feat, int32_t& num_vec)
{
    uint8_t * byte_matrix;
    get_matrix(byte_matrix,num_feat,num_vec);

    ASSERT(num_feat > 0 && num_vec > 0)
    matrix = SG_MALLOC(bool, num_feat*num_vec);

    for(int32_t i = 0;i < num_vec;i++)
    {
        for(int32_t j = 0;j < num_feat;j++)
            matrix[i*num_feat+j] = byte_matrix[i*num_feat+j] != 0 ? 1 : 0;
    }

    SG_FREE(byte_matrix);
}

void CFile::set_matrix(const bool* matrix, int32_t num_feat, int32_t num_vec)
{
    uint8_t * byte_matrix = SG_MALLOC(uint8_t, num_feat*num_vec);
    for(int32_t i = 0;i < num_vec;i++)
    {
        for(int32_t j = 0;j < num_feat;j++)
            byte_matrix[i*num_feat+j] = matrix[i*num_feat+j] != 0 ? 1 : 0;
    }

    set_matrix(byte_matrix,num_feat,num_vec);

    SG_FREE(byte_matrix);
}

void CFile::get_string_list(
        SGString<bool>*& strings, int32_t& num_str,
        int32_t& max_string_len)
{
    SGString<int8_t>* strs;
    get_int8_string_list(strs, num_str, max_string_len);

    ASSERT(num_str>0 && max_string_len>0);
    strings=SG_MALLOC(SGString<bool>, num_str);

    for(int32_t i = 0;i < num_str;i++)
    {
        strings[i].slen = strs[i].slen;
                strings[i].string = SG_MALLOC(bool, strs[i].slen);
        for(int32_t j = 0;j < strs[i].slen;j++)
        strings[i].string[j] = strs[i].string[j] != 0 ? 1 : 0;
    }

    for(int32_t i = 0;i < num_str;i++)
        SG_FREE(strs[i].string);
    SG_FREE(strs);
}

void CFile::set_string_list(const SGString<bool>* strings, int32_t num_str)
{
    SGString<int8_t> * strs = SG_MALLOC(SGString<int8_t>, num_str);

    for(int32_t i = 0;i < num_str;i++)
    {
        strs[i].slen = strings[i].slen;
        strs[i].string = SG_MALLOC(int8_t, strings[i].slen);
        for(int32_t j = 0;j < strings[i].slen;j++)
        strs[i].string[j] = strings[i].string[j] != 0 ? 1 : 0;
    }

    set_int8_string_list(strs,num_str);

    for(int32_t i = 0;i < num_str;i++)
        SG_FREE(strs[i].string);
    SG_FREE(strs);
}

CFile::~CFile()
{
    close();
}

void CFile::set_variable_name(const char* name)
{
    SG_FREE(variable_name);
    variable_name=strdup(name);
}

char* CFile::get_variable_name()
{
    return strdup(variable_name);
}

char* CFile::read_whole_file(char* fname, size_t& len)
{
    FILE* tmpf=fopen(fname, "r");
    ASSERT(tmpf);
    fseek(tmpf,0,SEEK_END);
    len=ftell(tmpf);
    ASSERT(len>0);
    rewind(tmpf);
    char* result = SG_MALLOC(char, len);
    size_t total=fread(result,1,len,tmpf);
    ASSERT(total==len);
    fclose(tmpf);
    return result;
}