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#include <string.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "Buffer.h"
#include "generic.h"
Buffer::Buffer(bool _seekable) : Handle(-1), buffer(0), zero(0), realsiz(0), bufsiz(0), ptr(0), seekable(_seekable) { }
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), seekable(b.seekable) {
buffer = (Byte *) malloc(bufsiz);
memcpy(buffer, b.buffer, bufsiz);
}
ssize_t Buffer::write(const void *buf, size_t count) throw (GeneralException) {
if (!count) {
return 0;
}
if (count + realsiz > bufsiz) {
int numblocks = (count + realsiz) / realloc_threshold;
int remains = (count + realsiz) % realloc_threshold;
buffer = (Byte *) 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 (!seekable) {
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 = (Byte *) realloc(buffer, bufsiz = (numblocks * realloc_threshold));
}
}
return count;
}
bool Buffer::CanRead() const {
return true;
}
bool Buffer::CanWrite() const {
return true;
}
String Buffer::GetName() const {
return "Buffer";
}
Buffer Buffer::operator=(const Buffer & b) {
if (b.buffer != buffer) {
free(buffer);
realsiz = b.realsiz;
ptr = b.ptr;
seekable = b.seekable;
if ((bufsiz = b.bufsiz)) {
buffer = (Byte *) malloc(bufsiz);
memcpy(buffer, b.buffer, realsiz);
} else {
buffer = 0;
}
}
return *this;
}
bool Buffer::CanWatch() const {
return false;
}
ssize_t Buffer::GetSize() const {
return realsiz;
}
Byte Buffer::operator[](size_t p) const {
if (p >= realsiz) {
return 0;
} else {
if (seekable) {
return buffer[p];
} else {
return buffer[ptr + p];
}
}
}
Byte & Buffer::operator[](size_t p) {
if (p > bufsiz) {
int numblocks = p / realloc_threshold;
int remains = p % realloc_threshold;
buffer = (Byte *) realloc(buffer, bufsiz = ((numblocks + (remains ? 1 : 0)) * realloc_threshold));
}
if (p >= realsiz) {
memset(buffer + realsiz, 0, p - realsiz);
realsiz = p + 1;
}
if (seekable) {
return buffer[p];
} else {
return buffer[ptr + p];
}
}
bool Buffer::CanSeek() const {
return seekable;
}
off_t Buffer::seek(off_t off, int wheel) throw (GeneralException) {
if (!seekable) {
throw GeneralException("This buffer is a fifo, thus is not seekable");
}
switch (wheel) {
case SEEK_SET:
ptr = off;
break;
case SEEK_CUR:
ptr += off;
break;
case SEEK_END:
ptr = realsiz + off;
break;
}
operator[](ptr);
return ptr;
}
off_t Buffer::tell() const {
return ptr;
}
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