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/* |
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buffer.h - Part of psiconv, a PSION 5 file formats converter |
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Copyright (c) 2000-2014 Frodo Looijaard <frodo@frodo.looijaard.name> |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(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., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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#ifndef PSICONV_BUFFER_H |
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#define PSICONV_BUFFER_H |
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/* A psiconv_buffer is a buffer of raw byte data. It is used when parsing |
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or generating a Psion file. You can use references within it that |
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are resolved at a later time. */ |
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#include <psiconv/general.h> |
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#ifdef __cplusplus |
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extern "C" { |
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#endif /* __cplusplus */ |
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/* Always use psiconv_buffer, never struct psiconv_buffer_s */ |
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/* No need to export the actual internal format */ |
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typedef struct psiconv_buffer_s *psiconv_buffer; |
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/* Allocate a new buffer. Returns NULL when not enough memory is available. |
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All other functions assume you have called this function first! */ |
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extern psiconv_buffer psiconv_buffer_new(void); |
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/* Free a buffer and reclaim its memory. Never use a buffer again after |
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calling this (unless you do a psiconv_buffer_new on it first) */ |
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extern void psiconv_buffer_free(psiconv_buffer buf); |
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/* Get the length of the data */ |
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extern psiconv_u32 psiconv_buffer_length(const psiconv_buffer buf); |
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/* Get one byte of data. Returns NULL if you are trying to read past |
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the end of the buffer. Do not use this; instead use psiconv_read_u8 |
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and friends */ |
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extern psiconv_u8 *psiconv_buffer_get(const psiconv_buffer buf, |
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psiconv_u32 off); |
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/* Add one byte of data to the end. Returns 0 on success, and an error |
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code on failure. Do not use this; instead use psiconv_write_u8 and |
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friends */ |
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extern int psiconv_buffer_add(psiconv_buffer buf,psiconv_u8 data); |
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/* Do an fread to the buffer. Returns the number of read bytes. See |
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fread(3) for more information. */ |
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extern size_t psiconv_buffer_fread(psiconv_buffer buf,size_t size, FILE *f); |
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/* Read a complete file to the buffer. Returns 0 on success, and an |
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error code on failure. */ |
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extern int psiconv_buffer_fread_all(psiconv_buffer buf, FILE *f); |
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/* Write a complete buffer to file. Returns 0 on success, and an |
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error code on failure. */ |
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extern int psiconv_buffer_fwrite_all(const psiconv_buffer buf, FILE *f); |
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/* Concatenate two buffers: the second buffer is appended to the first. |
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References are updated too. Buffer extra is untouched after this and must |
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still be freed if you want to get rid of it. */ |
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extern int psiconv_buffer_concat(psiconv_buffer buf, |
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const psiconv_buffer extra); |
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/* Add a target to the reference list. This does not really change the |
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buffer data in any way. The id needs to be unique. The target is |
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added at the current end of the buffer. */ |
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extern int psiconv_buffer_add_target(psiconv_buffer buf, int id); |
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/* Add a reference to a target to the reference list. The id does not |
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need to be defined already, though it must be by the time you call |
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psiconv_buffer_resolve. The reference is added to the current end |
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of the buffer, and space is allocated for it. References are always |
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longs (psiconv_u32). */ |
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extern int psiconv_buffer_add_reference(psiconv_buffer buf,int id); |
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/* Resolve all references and empty the reference list. */ |
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extern int psiconv_buffer_resolve(psiconv_buffer buf); |
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/* Get a unique reference id */ |
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extern psiconv_u32 psiconv_buffer_unique_id(void); |
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/* Extract part of a buffer and put it into a new buffer. Note that |
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references and targets are not copied; you will have to resolve them |
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beforehand (but as this function is meant for reading buffers, they |
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will usually not be used). */ |
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extern int psiconv_buffer_subbuffer(psiconv_buffer *buf, |
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const psiconv_buffer org, |
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psiconv_u32 offset, psiconv_u32 length); |
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#ifdef __cplusplus |
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} |
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#endif /* __cplusplus */ |
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#endif /* def PSICONV_BUFFER_H */ |