mbfl_memory_device.c

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/*
 * "streamable kanji code filter and converter"
 * Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
 *
 * LICENSE NOTICES
 *
 * This file is part of "streamable kanji code filter and converter",
 * which is distributed under the terms of GNU Lesser General Public
 * License (version 2) as published by the Free Software Foundation.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with "streamable kanji code filter and converter";
 * if not, write to the Free Software Foundation, Inc., 59 Temple Place,
 * Suite 330, Boston, MA  02111-1307  USA
 *
 * The author of this file:
 *
 */
/*
 * The source code included in this files was separated from mbfilter.c
 * by Moriyoshi Koizumi <moriyoshi@php.net> on 20 Dec 2002. The file
 * mbfilter.c is included in this package .
 *
 */
 
#include <stddef.h>
#include <string.h>
 
#include "zend.h"
#include "mbfl_memory_device.h"
 
/*
 * memory device output functions
 */
void mbfl_memory_device_init(mbfl_memory_device *device, size_t initsz, size_t allocsz)
{
    device->buffer = (initsz > 0) ? emalloc(initsz) : NULL;
    device->length = initsz;
    device->pos = 0;
    device->allocsz = MAX(allocsz, MBFL_MEMORY_DEVICE_ALLOC_SIZE);
}
 
void mbfl_memory_device_realloc(mbfl_memory_device *device, size_t initsz, size_t allocsz)
{
    if (initsz > device->length) {
        device->buffer = erealloc(device->buffer, initsz);
        device->length = initsz;
    }
    device->allocsz = MAX(allocsz, MBFL_MEMORY_DEVICE_ALLOC_SIZE);
}
 
void mbfl_memory_device_clear(mbfl_memory_device *device)
{
    if (device->buffer) {
        efree(device->buffer);
    }
    device->buffer = NULL;
    device->length = device->pos = 0;
}
 
void mbfl_memory_device_reset(mbfl_memory_device *device)
{
    device->pos = 0;
}
 
void mbfl_memory_device_unput(mbfl_memory_device *device)
{
    if (device->pos > 0) {
        device->pos--;
    }
}
 
mbfl_string* mbfl_memory_device_result(mbfl_memory_device *device, mbfl_string *result)
{
    result->len = device->pos;
    mbfl_memory_device_output('\0', device);
    result->val = device->buffer;
    device->buffer = NULL;
    device->length = device->pos = 0;
    return result;
}
 
int mbfl_memory_device_output(int c, void *data)
{
    mbfl_memory_device *device = (mbfl_memory_device *)data;
 
    if (device->pos >= device->length) {
        /* reallocate buffer */
 
        if (device->length > SIZE_MAX - device->allocsz) {
            /* overflow */
            return -1;
        }
 
        size_t newlen = device->length + device->allocsz;
        device->buffer = erealloc(device->buffer, newlen);
        device->length = newlen;
    }
 
    device->buffer[device->pos++] = (unsigned char)c;
    return 0;
}
 
int mbfl_memory_device_strcat(mbfl_memory_device *device, const char *psrc)
{
    return mbfl_memory_device_strncat(device, psrc, strlen(psrc));
}
 
int mbfl_memory_device_strncat(mbfl_memory_device *device, const char *psrc, size_t len)
{
    if (len > device->length - device->pos) {
        /* reallocate buffer */
 
        if (len > SIZE_MAX - MBFL_MEMORY_DEVICE_ALLOC_SIZE
                || device->length > SIZE_MAX - (len + MBFL_MEMORY_DEVICE_ALLOC_SIZE)) {
            /* overflow */
            return -1;
        }
 
        size_t newlen = device->length + len + MBFL_MEMORY_DEVICE_ALLOC_SIZE;
        device->buffer = erealloc(device->buffer, newlen);
        device->length = newlen;
    }
 
    unsigned char *w = &device->buffer[device->pos];
    memcpy(w, psrc, len);
    device->pos += len;
 
    return 0;
}
 
int mbfl_memory_device_devcat(mbfl_memory_device *dest, mbfl_memory_device *src)
{
    return mbfl_memory_device_strncat(dest, (const char*)src->buffer, src->pos);
}
 
void mbfl_wchar_device_init(mbfl_wchar_device *device)
{
    device->buffer = NULL;
    device->length = 0;
    device->pos = 0;
    device->allocsz = MBFL_MEMORY_DEVICE_ALLOC_SIZE;
}
 
void mbfl_wchar_device_clear(mbfl_wchar_device *device)
{
    if (device->buffer) {
        efree(device->buffer);
    }
    device->buffer = NULL;
    device->length = device->pos = 0;
}
 
int mbfl_wchar_device_output(int c, void *data)
{
    mbfl_wchar_device *device = (mbfl_wchar_device *)data;
 
    if (device->pos >= device->length) {
        /* reallocate buffer */
        size_t newlen;
 
        if (device->length > SIZE_MAX - device->allocsz) {
            /* overflow */
            return -1;
        }
 
        newlen = device->length + device->allocsz;
        if (newlen > SIZE_MAX / sizeof(int)) {
            /* overflow */
            return -1;
        }
 
        device->buffer = erealloc(device->buffer, newlen * sizeof(int));
        device->length = newlen;
    }
 
    device->buffer[device->pos++] = c;
    return 0;
}