mirror of
https://github.com/DrBeef/Raze.git
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136 lines
2.8 KiB
C
136 lines
2.8 KiB
C
/* Extended Module Player
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* Copyright (C) 1996-2016 Claudio Matsuoka and Hipolito Carraro Jr
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stddef.h>
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#include <limits.h>
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#ifndef LIBXMP_CORE_PLAYER
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#include <sys/types.h>
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#include <sys/stat.h>
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#endif
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#include "common.h"
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#include "memio.h"
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static inline ptrdiff_t CAN_READ(MFILE *m)
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{
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if (m->size >= 0)
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return m->pos >= 0 ? m->size - m->pos : 0;
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return INT_MAX;
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}
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int mgetc(MFILE *m)
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{
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if (CAN_READ(m) >= 1)
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return *(const uint8 *)(m->start + m->pos++);
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else
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return EOF;
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}
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size_t mread(void *buf, size_t size, size_t num, MFILE *m)
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{
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size_t should_read = size * num;
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ptrdiff_t can_read = CAN_READ(m);
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if (!size || !num || can_read <= 0) {
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return 0;
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}
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if (should_read > can_read) {
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should_read = can_read;
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}
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memcpy(buf, m->start + m->pos, should_read);
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m->pos += should_read;
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return should_read / size;
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}
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int mseek(MFILE *m, long offset, int whence)
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{
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switch (whence) {
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default:
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case SEEK_SET:
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if (m->size >= 0 && (offset > m->size || offset < 0))
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return -1;
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m->pos = offset;
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return 0;
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case SEEK_CUR:
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if (m->size >= 0 && (offset > CAN_READ(m) || offset < -m->pos))
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return -1;
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m->pos += offset;
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return 0;
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case SEEK_END:
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if (m->size < 0)
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return -1;
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m->pos = m->size + offset;
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return 0;
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}
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}
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long mtell(MFILE *m)
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{
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return (long)m->pos;
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}
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int meof(MFILE *m)
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{
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if (m->size <= 0)
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return 0;
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else
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return CAN_READ(m) <= 0;
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}
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MFILE *mopen(const void *ptr, long size)
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{
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MFILE *m;
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m = (MFILE *)malloc(sizeof (MFILE));
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if (m == NULL)
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return NULL;
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m->start = (const unsigned char *)ptr;
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m->pos = 0;
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m->size = size;
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return m;
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}
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int mclose(MFILE *m)
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{
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free(m);
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return 0;
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}
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#ifndef LIBXMP_CORE_PLAYER
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int mstat(MFILE *m, struct stat *st)
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{
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memset(st, 0, sizeof (struct stat));
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st->st_size = m->size;
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return 0;
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}
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#endif
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