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#include <string.h>
#include "Buffer.h"
#include "General.h"
#include "config.h"
Buffer::Buffer() : Handle(-1), buffer(0), realsiz(0), bufsiz(0), ptr(0) { }
Buffer::~Buffer() {
free(buffer);
}
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;
}
void Buffer::deflate(void) throw (GeneralException) {
int err;
if (ptr) {
throw GeneralException(_("Can't deflate: buffer has already been read"));
}
err = deflateInit(&zs, Z_BEST_COMPRESSION);
if (err != Z_OK) {
throw GeneralException(String(_("Can't init Zlib: ")) + zs.msg);
}
zbuffer = (char *) malloc(realsiz);
zs.next_in = (Bytef *) buffer;
zs.avail_in = realsiz;
zs.next_out = (Bytef *) zbuffer;
zs.avail_out = realsiz;
zs.zalloc = Z_NULL;
zs.zfree = Z_NULL;
zs.opaque = Z_NULL;
err = ::deflate(&zs, Z_FINISH);
if (err != Z_STREAM_END) {
throw GeneralException(String(_("Error during deflate: ")) + zs.msg);
}
err = deflateEnd(&zs);
if (err != Z_OK) {
throw GeneralException(String(_("Error during deflateEnd: ")) + zs.msg);
}
free(buffer);
buffer = zbuffer;
realsiz = zs.total_out;
int numblocks = realsiz / realloc_threshold;
int remains = realsiz % realloc_threshold;
buffer = (char *) realloc(buffer, bufsiz = ((numblocks + (remains ? 1 : 0)) * realloc_threshold));
}
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