ixmlmembuf.cpp

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/**************************************************************************
 *
 * Copyright (c) 2000-2003 Intel Corporation
 * All rights reserved.
 * Copyright (c) 2012 France Telecom All rights reserved.
 * Copyright (C) 2022 GPL 3 and higher by Ingo Höft,  <Ingo@Hoeft-online.de>
 * Redistribution only with this Copyright remark. Last modified: 2025-05-29
 *
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 * modification, are permitted provided that the following conditions are met:
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#include <ixml/ixmlmembuf.hpp>
#include <ixml/ixml.hpp>
 
#include <cassert>
#include <cstring>
 
static int ixml_membuf_set_size(
    ixml_membuf* m,
    size_t new_length) {
    size_t diff;
    size_t alloc_len;
    char* temp_buf;
 
    if (new_length >= m->length) {
        /* increase length */
        /* need more mem? */
        if (new_length <= m->capacity) {
            /* have enough mem; done */
            return 0;
        }
 
        diff = new_length - m->length;
        alloc_len = MAXVAL(m->size_inc, diff) + m->capacity;
    } else {
        /* decrease length */
        assert(new_length <= m->length);
 
        /* if diff is 0..m->size_inc, don't free */
        if ((m->capacity - new_length) <= m->size_inc) {
            return 0;
        }
        alloc_len = new_length + m->size_inc;
    }
 
    assert(alloc_len >= new_length);
 
    temp_buf = (char*)realloc(m->buf, alloc_len + (size_t)1);
    if (temp_buf == NULL) {
        /* try smaller size */
        alloc_len = new_length;
        temp_buf = (char*)realloc(m->buf, alloc_len + (size_t)1);
        if (temp_buf == NULL) {
            return IXML_INSUFFICIENT_MEMORY;
        }
    }
    /* save */
    m->buf = temp_buf;
    m->capacity = alloc_len;
 
    return 0;
}
 
void ixml_membuf_init(ixml_membuf* m) {
    assert(m != NULL);
 
    m->size_inc = MEMBUF_DEF_SIZE_INC;
    m->buf = NULL;
    m->length = (size_t)0;
    m->capacity = (size_t)0;
}
 
void ixml_membuf_destroy(ixml_membuf* m) {
    if (m == NULL) {
        return;
    }
 
    free(m->buf);
    ixml_membuf_init(m);
}
 
int ixml_membuf_assign(ixml_membuf* m, const void* buf, size_t buf_len) {
    int return_code;
 
    assert(m != NULL);
 
    /* set value to null */
    if (buf == NULL) {
        ixml_membuf_destroy(m);
        return IXML_SUCCESS;
    }
    /* alloc mem */
    return_code = ixml_membuf_set_size(m, buf_len);
    if (return_code != 0) {
        return return_code;
    }
 
    /* copy */
    memcpy(m->buf, buf, buf_len);
 
    /* null-terminate */
    m->buf[buf_len] = 0;
    m->length = buf_len;
 
    return IXML_SUCCESS;
}
 
int ixml_membuf_assign_str(ixml_membuf* m, const char* c_str) {
    return ixml_membuf_assign(m, c_str, strlen(c_str));
}
 
int ixml_membuf_append(
    ixml_membuf* m,
    const void* buf) {
    assert(m != NULL);
 
    return ixml_membuf_insert(m, buf, (size_t)1, m->length);
}
 
int ixml_membuf_append_str(
    ixml_membuf* m,
    const char* c_str) {
    return ixml_membuf_insert(m, c_str, strlen(c_str), m->length);
}
 
int ixml_membuf_insert(
    ixml_membuf* m,
    const void* buf,
    size_t buf_len,
    size_t index) {
    int return_code = 0;
 
    assert(m != NULL);
 
    if (index > m->length) {
        return IXML_INDEX_SIZE_ERR;
    }
 
    if (buf == NULL || buf_len == (size_t)0) {
        return 0;
    }
    /* alloc mem */
    return_code = ixml_membuf_set_size(m, m->length + buf_len);
    if (return_code != 0) {
        return return_code;
    }
    /* insert data */
    /* move data to right of insertion point */
    memmove(m->buf + index + buf_len, m->buf + index, m->length - index);
    memcpy(m->buf + index, buf, buf_len);
    m->length += buf_len;
    /* Null terminate */
    m->buf[m->length] = 0;
 
    return 0;
}