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75 lines
2.7 KiB
C
75 lines
2.7 KiB
C
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/*
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Serval Daemon
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Copyright (C) 2012 Serval Project Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef _SERVALD_OVERLAY_BUFFER_H
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#define _SERVALD_OVERLAY_BUFFER_H
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struct overlay_buffer {
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unsigned char *bytes;
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// remembered position for rewinding
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int checkpointLength;
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// position of data read / written
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int position;
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// maximum allowed bytes for reading / writing
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int sizeLimit;
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// size of buffer
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int allocSize;
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// is this an allocated buffer? can it be resized? Should it be freed?
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int allocated;
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// length position and size for later patching
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int var_length_offset;
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int var_length_bytes;
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};
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struct overlay_buffer *ob_new(void);
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struct overlay_buffer *ob_static(unsigned char *bytes, int size);
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struct overlay_buffer *ob_slice(struct overlay_buffer *b, int offset, int length);
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struct overlay_buffer *ob_dup(struct overlay_buffer *b);
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int ob_free(struct overlay_buffer *b);
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int ob_checkpoint(struct overlay_buffer *b);
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int ob_rewind(struct overlay_buffer *b);
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int ob_limitsize(struct overlay_buffer *b,int bytes);
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int ob_unlimitsize(struct overlay_buffer *b);
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int ob_makespace(struct overlay_buffer *b,int bytes);
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int ob_append_byte(struct overlay_buffer *b,unsigned char byte);
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int ob_append_bytes(struct overlay_buffer *b,unsigned char *bytes,int count);
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unsigned char *ob_append_space(struct overlay_buffer *b,int count);
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int ob_append_ui16(struct overlay_buffer *b, uint16_t v);
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int ob_append_ui32(struct overlay_buffer *b, uint32_t v);
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int ob_patch_rfs(struct overlay_buffer *b,int l);
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int ob_append_rfs(struct overlay_buffer *b,int l);
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// get one byte, -ve number indicates failure
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int ob_getbyte(struct overlay_buffer *b,int ofs);
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// get one byte from the current position, -ve number indicates failure
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int ob_get(struct overlay_buffer *b);
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int ob_get_bytes(struct overlay_buffer *b, unsigned char *buff, int len);
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unsigned char * ob_get_bytes_ptr(struct overlay_buffer *b, int len);
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uint32_t ob_get_ui32(struct overlay_buffer *b);
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uint16_t ob_get_ui16(struct overlay_buffer *b);
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int ob_dump(struct overlay_buffer *b,char *desc);
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#endif
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