114 lines
2.7 KiB
C++
114 lines
2.7 KiB
C++
//
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// libtgvoip is free and unencumbered public domain software.
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// For more information, see http://unlicense.org or the UNLICENSE file
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// you should have received with this source code distribution.
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//
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#include "BufferInputStream.h"
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#include <assert.h>
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#include <string.h>
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#include <exception>
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#include <stdexcept>
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using namespace tgvoip;
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BufferInputStream::BufferInputStream(unsigned char* data, size_t length){
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this->buffer=data;
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this->length=length;
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offset=0;
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}
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BufferInputStream::~BufferInputStream(){
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}
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void BufferInputStream::Seek(size_t offset){
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if(offset>length){
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throw std::out_of_range("Not enough bytes in buffer");
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}
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this->offset=offset;
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}
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size_t BufferInputStream::GetLength(){
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return length;
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}
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size_t BufferInputStream::GetOffset(){
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return offset;
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}
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size_t BufferInputStream::Remaining(){
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return length-offset;
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}
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unsigned char BufferInputStream::ReadByte(){
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EnsureEnoughRemaining(1);
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return (unsigned char)buffer[offset++];
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}
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int32_t BufferInputStream::ReadInt32(){
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EnsureEnoughRemaining(4);
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int32_t res=((int32_t)buffer[offset] & 0xFF) |
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(((int32_t)buffer[offset+1] & 0xFF) << 8) |
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(((int32_t)buffer[offset+2] & 0xFF) << 16) |
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(((int32_t)buffer[offset+3] & 0xFF) << 24);
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offset+=4;
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return res;
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}
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int64_t BufferInputStream::ReadInt64(){
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EnsureEnoughRemaining(8);
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int64_t res=((int64_t)buffer[offset] & 0xFF) |
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(((int64_t)buffer[offset+1] & 0xFF) << 8) |
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(((int64_t)buffer[offset+2] & 0xFF) << 16) |
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(((int64_t)buffer[offset+3] & 0xFF) << 24) |
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(((int64_t)buffer[offset+4] & 0xFF) << 32) |
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(((int64_t)buffer[offset+5] & 0xFF) << 40) |
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(((int64_t)buffer[offset+6] & 0xFF) << 48) |
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(((int64_t)buffer[offset+7] & 0xFF) << 56);
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offset+=8;
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return res;
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}
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int16_t BufferInputStream::ReadInt16(){
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EnsureEnoughRemaining(2);
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int16_t res=(uint16_t)buffer[offset] | ((uint16_t)buffer[offset+1] << 8);
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offset+=2;
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return res;
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}
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int32_t BufferInputStream::ReadTlLength(){
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unsigned char l=ReadByte();
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if(l<254)
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return l;
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assert(length-offset>=3);
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EnsureEnoughRemaining(3);
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int32_t res=((int32_t)buffer[offset] & 0xFF) |
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(((int32_t)buffer[offset+1] & 0xFF) << 8) |
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(((int32_t)buffer[offset+2] & 0xFF) << 16);
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offset+=3;
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return res;
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}
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void BufferInputStream::ReadBytes(unsigned char *to, size_t count){
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EnsureEnoughRemaining(count);
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memcpy(to, buffer+offset, count);
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offset+=count;
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}
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BufferInputStream BufferInputStream::GetPartBuffer(size_t length, bool advance){
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EnsureEnoughRemaining(length);
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BufferInputStream s=BufferInputStream(buffer+offset, length);
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if(advance)
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offset+=length;
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return s;
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}
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void BufferInputStream::EnsureEnoughRemaining(size_t need){
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if(length-offset<need){
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throw std::out_of_range("Not enough bytes in buffer");
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}
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}
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