mirror of
https://github.com/cesanta/mongoose.git
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74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
#include "iobuf.h"
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#include "log.h"
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#include <string.h>
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// Not using memset for zeroing memory, cause it can be dropped by compiler
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// See https://github.com/cesanta/mongoose/pull/1265
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static void zeromem(volatile unsigned char *buf, size_t len) {
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if (buf != NULL) {
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while (len--) *buf++ = 0;
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}
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}
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int mg_iobuf_resize(struct mg_iobuf *io, size_t new_size) {
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int ok = 1;
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if (new_size == 0) {
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zeromem(io->buf, io->size);
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free(io->buf);
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io->buf = NULL;
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io->len = io->size = 0;
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} else if (new_size != io->size) {
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// NOTE(lsm): do not use realloc here. Use calloc/free only, to ease the
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// porting to some obscure platforms like FreeRTOS
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void *p = calloc(1, new_size);
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if (p != NULL) {
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size_t len = new_size < io->len ? new_size : io->len;
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if (len > 0) memmove(p, io->buf, len);
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zeromem(io->buf, io->size);
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free(io->buf);
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io->buf = (unsigned char *) p;
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io->size = new_size;
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} else {
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ok = 0;
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MG_ERROR(("%lld->%lld", (uint64_t) io->size, (uint64_t) new_size));
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}
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}
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return ok;
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}
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int mg_iobuf_init(struct mg_iobuf *io, size_t size) {
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io->buf = NULL;
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io->size = io->len = 0;
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return mg_iobuf_resize(io, size);
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}
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size_t mg_iobuf_add(struct mg_iobuf *io, size_t ofs, const void *buf,
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size_t len, size_t chunk_size) {
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size_t new_size = io->len + len;
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if (new_size > io->size) {
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new_size += chunk_size; // Make sure that io->size
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new_size -= new_size % chunk_size; // is aligned by chunk_size boundary
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mg_iobuf_resize(io, new_size); // Attempt to realloc
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if (new_size != io->size) len = 0; // Realloc failure, append nothing
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}
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if (ofs < io->len) memmove(io->buf + ofs + len, io->buf + ofs, io->len - ofs);
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if (buf != NULL) memmove(io->buf + ofs, buf, len);
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if (ofs > io->len) io->len += ofs - io->len;
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io->len += len;
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return len;
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}
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size_t mg_iobuf_del(struct mg_iobuf *io, size_t ofs, size_t len) {
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if (ofs > io->len) ofs = io->len;
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if (ofs + len > io->len) len = io->len - ofs;
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if (io->buf) memmove(io->buf + ofs, io->buf + ofs + len, io->len - ofs - len);
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if (io->buf) zeromem(io->buf + io->len - len, len);
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io->len -= len;
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return len;
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}
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void mg_iobuf_free(struct mg_iobuf *io) {
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mg_iobuf_resize(io, 0);
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}
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