mirror of
https://github.com/netwide-assembler/nasm.git
synced 2024-12-15 09:09:58 +08:00
437e0ffa01
If putting the file pointer past the end of the array, expand the array with zeroes. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
384 lines
8.7 KiB
C
384 lines
8.7 KiB
C
/* ----------------------------------------------------------------------- *
|
|
*
|
|
* Copyright 1996-2017 The NASM Authors - All Rights Reserved
|
|
* See the file AUTHORS included with the NASM distribution for
|
|
* the specific copyright holders.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following
|
|
* conditions are met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials provided
|
|
* with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
|
|
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
|
|
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
|
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
|
|
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
#include "compiler.h"
|
|
#include "nasmlib.h"
|
|
#include "saa.h"
|
|
|
|
/* Aggregate SAA components smaller than this */
|
|
#define SAA_BLKSHIFT 16
|
|
#define SAA_BLKLEN ((size_t)1 << SAA_BLKSHIFT)
|
|
|
|
struct SAA *saa_init(size_t elem_len)
|
|
{
|
|
struct SAA *s;
|
|
char *data;
|
|
|
|
s = nasm_zalloc(sizeof(struct SAA));
|
|
|
|
if (elem_len >= SAA_BLKLEN)
|
|
s->blk_len = elem_len;
|
|
else
|
|
s->blk_len = SAA_BLKLEN - (SAA_BLKLEN % elem_len);
|
|
|
|
s->elem_len = elem_len;
|
|
s->length = s->blk_len;
|
|
data = nasm_malloc(s->blk_len);
|
|
s->nblkptrs = s->nblks = 1;
|
|
s->blk_ptrs = nasm_malloc(sizeof(char *));
|
|
s->blk_ptrs[0] = data;
|
|
s->wblk = s->rblk = &s->blk_ptrs[0];
|
|
|
|
return s;
|
|
}
|
|
|
|
void saa_free(struct SAA *s)
|
|
{
|
|
char **p;
|
|
size_t n;
|
|
|
|
for (p = s->blk_ptrs, n = s->nblks; n; p++, n--)
|
|
nasm_free(*p);
|
|
|
|
nasm_free(s->blk_ptrs);
|
|
nasm_free(s);
|
|
}
|
|
|
|
/* Add one allocation block to an SAA */
|
|
static void saa_extend(struct SAA *s)
|
|
{
|
|
size_t blkn = s->nblks++;
|
|
|
|
if (blkn >= s->nblkptrs) {
|
|
size_t rindex = s->rblk - s->blk_ptrs;
|
|
size_t windex = s->wblk - s->blk_ptrs;
|
|
|
|
s->nblkptrs <<= 1;
|
|
s->blk_ptrs =
|
|
nasm_realloc(s->blk_ptrs, s->nblkptrs * sizeof(char *));
|
|
|
|
s->rblk = s->blk_ptrs + rindex;
|
|
s->wblk = s->blk_ptrs + windex;
|
|
}
|
|
|
|
s->blk_ptrs[blkn] = nasm_malloc(s->blk_len);
|
|
s->length += s->blk_len;
|
|
}
|
|
|
|
void *saa_wstruct(struct SAA *s)
|
|
{
|
|
void *p;
|
|
|
|
nasm_assert((s->wpos % s->elem_len) == 0);
|
|
|
|
if (s->wpos + s->elem_len > s->blk_len) {
|
|
nasm_assert(s->wpos == s->blk_len);
|
|
if (s->wptr + s->elem_len > s->length)
|
|
saa_extend(s);
|
|
s->wblk++;
|
|
s->wpos = 0;
|
|
}
|
|
|
|
p = *s->wblk + s->wpos;
|
|
s->wpos += s->elem_len;
|
|
s->wptr += s->elem_len;
|
|
|
|
if (s->wptr > s->datalen)
|
|
s->datalen = s->wptr;
|
|
|
|
return p;
|
|
}
|
|
|
|
void saa_wbytes(struct SAA *s, const void *data, size_t len)
|
|
{
|
|
const char *d = data;
|
|
|
|
while (len) {
|
|
size_t l = s->blk_len - s->wpos;
|
|
if (l > len)
|
|
l = len;
|
|
if (l) {
|
|
if (d) {
|
|
memcpy(*s->wblk + s->wpos, d, l);
|
|
d += l;
|
|
} else
|
|
memset(*s->wblk + s->wpos, 0, l);
|
|
s->wpos += l;
|
|
s->wptr += l;
|
|
len -= l;
|
|
|
|
if (s->datalen < s->wptr)
|
|
s->datalen = s->wptr;
|
|
}
|
|
if (len) {
|
|
if (s->wptr >= s->length)
|
|
saa_extend(s);
|
|
s->wblk++;
|
|
s->wpos = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Writes a string, *including* the final null, to the specified SAA,
|
|
* and return the number of bytes written.
|
|
*/
|
|
size_t saa_wcstring(struct SAA *s, const char *str)
|
|
{
|
|
size_t bytes = strlen(str) + 1;
|
|
|
|
saa_wbytes(s, str, bytes);
|
|
|
|
return bytes;
|
|
}
|
|
|
|
void saa_rewind(struct SAA *s)
|
|
{
|
|
s->rblk = s->blk_ptrs;
|
|
s->rpos = s->rptr = 0;
|
|
}
|
|
|
|
void *saa_rstruct(struct SAA *s)
|
|
{
|
|
void *p;
|
|
|
|
if (s->rptr + s->elem_len > s->datalen)
|
|
return NULL;
|
|
|
|
nasm_assert((s->rpos % s->elem_len) == 0);
|
|
|
|
if (s->rpos + s->elem_len > s->blk_len) {
|
|
s->rblk++;
|
|
s->rpos = 0;
|
|
}
|
|
|
|
p = *s->rblk + s->rpos;
|
|
s->rpos += s->elem_len;
|
|
s->rptr += s->elem_len;
|
|
|
|
return p;
|
|
}
|
|
|
|
const void *saa_rbytes(struct SAA *s, size_t * lenp)
|
|
{
|
|
const void *p;
|
|
size_t len;
|
|
|
|
if (s->rptr >= s->datalen) {
|
|
*lenp = 0;
|
|
return NULL;
|
|
}
|
|
|
|
if (s->rpos >= s->blk_len) {
|
|
s->rblk++;
|
|
s->rpos = 0;
|
|
}
|
|
|
|
len = *lenp;
|
|
if (len > s->datalen - s->rptr)
|
|
len = s->datalen - s->rptr;
|
|
if (len > s->blk_len - s->rpos)
|
|
len = s->blk_len - s->rpos;
|
|
|
|
*lenp = len;
|
|
p = *s->rblk + s->rpos;
|
|
|
|
s->rpos += len;
|
|
s->rptr += len;
|
|
|
|
return p;
|
|
}
|
|
|
|
void saa_rnbytes(struct SAA *s, void *data, size_t len)
|
|
{
|
|
char *d = data;
|
|
|
|
nasm_assert(s->rptr + len <= s->datalen);
|
|
|
|
while (len) {
|
|
size_t l;
|
|
const void *p;
|
|
|
|
l = len;
|
|
p = saa_rbytes(s, &l);
|
|
|
|
memcpy(d, p, l);
|
|
d += l;
|
|
len -= l;
|
|
}
|
|
}
|
|
|
|
/* Same as saa_rnbytes, except position the counter first */
|
|
void saa_fread(struct SAA *s, size_t posn, void *data, size_t len)
|
|
{
|
|
size_t ix;
|
|
|
|
nasm_assert(posn + len <= s->datalen);
|
|
|
|
if (likely(s->blk_len == SAA_BLKLEN)) {
|
|
ix = posn >> SAA_BLKSHIFT;
|
|
s->rpos = posn & (SAA_BLKLEN - 1);
|
|
} else {
|
|
ix = posn / s->blk_len;
|
|
s->rpos = posn % s->blk_len;
|
|
}
|
|
s->rptr = posn;
|
|
s->rblk = &s->blk_ptrs[ix];
|
|
|
|
saa_rnbytes(s, data, len);
|
|
}
|
|
|
|
/* Same as saa_wbytes, except position the counter first */
|
|
void saa_fwrite(struct SAA *s, size_t posn, const void *data, size_t len)
|
|
{
|
|
size_t ix;
|
|
size_t padding = 0;
|
|
|
|
if (posn > s->datalen) {
|
|
padding = posn - s->datalen;
|
|
posn = s->datalen;
|
|
}
|
|
|
|
if (likely(s->blk_len == SAA_BLKLEN)) {
|
|
ix = posn >> SAA_BLKSHIFT;
|
|
s->wpos = posn & (SAA_BLKLEN - 1);
|
|
} else {
|
|
ix = posn / s->blk_len;
|
|
s->wpos = posn % s->blk_len;
|
|
}
|
|
s->wptr = posn;
|
|
s->wblk = &s->blk_ptrs[ix];
|
|
|
|
if (!s->wpos) {
|
|
s->wpos = s->blk_len;
|
|
s->wblk--;
|
|
}
|
|
|
|
if (padding)
|
|
saa_wbytes(s, NULL, padding);
|
|
|
|
saa_wbytes(s, data, len);
|
|
}
|
|
|
|
void saa_fpwrite(struct SAA *s, FILE * fp)
|
|
{
|
|
const char *data;
|
|
size_t len;
|
|
|
|
saa_rewind(s);
|
|
while (len = s->datalen, (data = saa_rbytes(s, &len)) != NULL)
|
|
nasm_write(data, len, fp);
|
|
}
|
|
|
|
void saa_write8(struct SAA *s, uint8_t v)
|
|
{
|
|
saa_wbytes(s, &v, 1);
|
|
}
|
|
|
|
void saa_write16(struct SAA *s, uint16_t v)
|
|
{
|
|
v = cpu_to_le16(v);
|
|
saa_wbytes(s, &v, 2);
|
|
}
|
|
|
|
void saa_write32(struct SAA *s, uint32_t v)
|
|
{
|
|
v = cpu_to_le32(v);
|
|
saa_wbytes(s, &v, 4);
|
|
}
|
|
|
|
void saa_write64(struct SAA *s, uint64_t v)
|
|
{
|
|
v = cpu_to_le64(v);
|
|
saa_wbytes(s, &v, 8);
|
|
}
|
|
|
|
void saa_writeaddr(struct SAA *s, uint64_t v, size_t len)
|
|
{
|
|
v = cpu_to_le64(v);
|
|
saa_wbytes(s, &v, len);
|
|
}
|
|
|
|
/* write unsigned LEB128 value to SAA */
|
|
void saa_wleb128u(struct SAA *psaa, int value)
|
|
{
|
|
char temp[64], *ptemp;
|
|
uint8_t byte;
|
|
int len;
|
|
|
|
ptemp = temp;
|
|
len = 0;
|
|
do {
|
|
byte = value & 127;
|
|
value >>= 7;
|
|
if (value != 0) /* more bytes to come */
|
|
byte |= 0x80;
|
|
*ptemp = byte;
|
|
ptemp++;
|
|
len++;
|
|
} while (value != 0);
|
|
saa_wbytes(psaa, temp, len);
|
|
}
|
|
|
|
/* write signed LEB128 value to SAA */
|
|
void saa_wleb128s(struct SAA *psaa, int value)
|
|
{
|
|
char temp[64], *ptemp;
|
|
uint8_t byte;
|
|
bool more, negative;
|
|
int size, len;
|
|
|
|
ptemp = temp;
|
|
more = 1;
|
|
negative = (value < 0);
|
|
size = sizeof(int) * 8;
|
|
len = 0;
|
|
while (more) {
|
|
byte = value & 0x7f;
|
|
value >>= 7;
|
|
if (negative)
|
|
/* sign extend */
|
|
value |= -(1 << (size - 7));
|
|
/* sign bit of byte is second high order bit (0x40) */
|
|
if ((value == 0 && !(byte & 0x40)) ||
|
|
((value == -1) && (byte & 0x40)))
|
|
more = 0;
|
|
else
|
|
byte |= 0x80;
|
|
*ptemp = byte;
|
|
ptemp++;
|
|
len++;
|
|
}
|
|
saa_wbytes(psaa, temp, len);
|
|
}
|