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#include <string.h>
#include "Buffer.h"
#include "General.h"
#include "config.h"
Buffer::Buffer() : Handle(-1), buffer(0), zero(0), realsiz(0), bufsiz(0), ptr(0) { }
Buffer::~Buffer() {
free(buffer);
}
Buffer::Buffer(const Buffer & b) : Handle(-1), buffer(0), zero(b.zero), realsiz(b.realsiz), bufsiz(b.bufsiz), ptr(b.ptr) {
buffer = (char *) malloc(bufsiz);
memcpy(buffer, b.buffer, bufsiz);
}
ssize_t Buffer::write(const void *buf, size_t count) {
if (!count) {
return 0;
}
if (count + realsiz > bufsiz) {
int numblocks = (count + realsiz) / realloc_threshold;
int remains = (count + realsiz) % realloc_threshold;
buffer = (char *) realloc(buffer, bufsiz = ((numblocks + (remains ? 1 : 0)) * realloc_threshold));
}
memcpy(buffer + realsiz, buf, count);
realsiz += count;
return count;
}
ssize_t Buffer::read(void *buf, size_t count) throw (GeneralException) {
count = MIN(count, realsiz - ptr);
if (!count) {
return 0;
}
memcpy(buf, buffer + ptr, count);
ptr += count;
if (ptr >= realloc_threshold) {
int numblocks = (bufsiz / realloc_threshold) - (ptr / realloc_threshold);
memmove(buffer, buffer + (bufsiz - numblocks * realloc_threshold), numblocks * realloc_threshold);
ptr -= (bufsiz - numblocks * realloc_threshold);
realsiz -= (bufsiz - numblocks * realloc_threshold);
buffer = (char *) realloc(buffer, bufsiz = (numblocks * realloc_threshold));
}
return count;
}
bool Buffer::CanRead() {
return true;
}
bool Buffer::CanWrite() {
return true;
}
String Buffer::GetName() {
return "Buffer";
}
Buffer Buffer::operator=(const Buffer & b) {
if (b.buffer != buffer) {
free(buffer);
realsiz = b.realsiz;
ptr = b.ptr;
if ((bufsiz = b.bufsiz)) {
buffer = (char *) malloc(bufsiz);
memcpy(buffer, b.buffer, realsiz);
} else {
buffer = 0;
}
}
return *this;
}
bool Buffer::CanWatch() {
return false;
}
ssize_t Buffer::GetSize() {
return realsiz;
}
char Buffer::operator[](size_t p) const {
if (p >= realsiz) {
return 0;
} else {
return buffer[ptr + p];
}
}
char & Buffer::operator[](size_t p) {
if (p >= realsiz) {
return zero;
} else {
return buffer[ptr + p];
}
}
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