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#include "msgpack/unpack.hpp"
#include "unpack_context.hpp"
#include <stdlib.h>
namespace msgpack {
struct unpacker::context {
context(zone* z)
{
msgpack_unpacker_init(&m_ctx);
m_ctx.user = z;
}
~context() { }
int execute(const void* data, size_t len, size_t* off)
{
return msgpack_unpacker_execute(&m_ctx, (const char*)data, len, off);
}
object_class* data()
{
return msgpack_unpacker_data(&m_ctx);
}
void reset()
{
zone* z = m_ctx.user;
msgpack_unpacker_init(&m_ctx);
m_ctx.user = z;
}
void reset(zone* z)
{
msgpack_unpacker_init(&m_ctx);
m_ctx.user = z;
}
zone* user()
{
return m_ctx.user;
}
void user(zone* z)
{
m_ctx.user = z;
}
private:
msgpack_unpacker m_ctx;
private:
context();
context(const context&);
};
unpacker::unpacker() :
m_zone(new zone()),
m_ctx(new context(m_zone)),
m_buffer(NULL),
m_used(0),
m_free(0),
m_off(0)
{ }
unpacker::~unpacker()
{
free(m_buffer);
delete m_ctx;
delete m_zone;
}
void unpacker::expand_buffer(size_t len)
{
if(m_off == 0) {
size_t next_size;
if(m_free != 0) { next_size = m_free * 2; }
else { next_size = UNPACKER_INITIAL_BUFFER_SIZE; }
while(next_size < len + m_used) { next_size *= 2; }
// FIXME realloc?
void* tmp = malloc(next_size);
if(!tmp) { throw std::bad_alloc(); }
memcpy(tmp, m_buffer, m_used);
free(m_buffer);
m_buffer = tmp;
m_free = next_size - m_used;
} else {
size_t next_size = UNPACKER_INITIAL_BUFFER_SIZE;
while(next_size < len + m_used - m_off) { next_size *= 2; }
void* tmp = malloc(next_size);
if(!tmp) { throw std::bad_alloc(); }
memcpy(tmp, ((char*)m_buffer)+m_off, m_used-m_off);
try {
m_zone->push_finalizer<void>(&zone::finalize_free, NULL, m_buffer);
} catch (...) {
free(tmp);
throw;
}
m_buffer = tmp;
m_used = m_used - m_off;
m_free = next_size - m_used;
m_off = 0;
}
}
bool unpacker::execute()
{
int ret = m_ctx->execute(m_buffer, m_used, &m_off);
if(ret < 0) {
throw unpack_error("parse error");
} else if(ret == 0) {
return false;
} else {
expand_buffer(0);
return true;
}
}
zone* unpacker::release_zone()
{
zone* nz = new zone();
zone* z = m_zone;
m_zone = nz;
m_ctx->user(m_zone);
return z;
}
object unpacker::data()
{
return object(m_ctx->data());
}
void unpacker::reset()
{
if(m_off != 0) { expand_buffer(0); }
if(!m_zone->empty()) {
delete m_zone;
m_zone = NULL;
m_zone = new zone();
}
m_ctx->reset();
}
object unpacker::unpack(const void* data, size_t len, zone& z)
{
context ctx(&z);
size_t off = 0;
int ret = ctx.execute(data, len, &off);
if(ret < 0) {
throw unpack_error("parse error");
} else if(ret == 0) {
throw unpack_error("insufficient bytes");
} else if(off < len) {
throw unpack_error("extra bytes");
}
return ctx.data();
}
} // namespace msgpack
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