forked from mia/Aegisub
92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
/*
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* savebuffer.h
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* Luabins save buffer
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* See copyright notice in luabins.h
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*/
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#ifndef LUABINS_SAVEBUFFER_H_INCLUDED_
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#define LUABINS_SAVEBUFFER_H_INCLUDED_
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typedef struct luabins_SaveBuffer
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{
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lua_Alloc alloc_fn;
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void * alloc_ud;
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unsigned char * buffer;
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size_t buf_size;
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size_t end;
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} luabins_SaveBuffer;
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void lbsSB_init(
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luabins_SaveBuffer * sb,
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lua_Alloc alloc_fn,
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void * alloc_ud
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);
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/*
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* Ensures that there is at least delta size available in buffer.
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* New size is aligned by blockSize increments.
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* Returns non-zero if resize failed.
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* If you pre-sized the buffer, subsequent writes up to the new size
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* are guaranteed to not fail.
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*/
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int lbsSB_grow(luabins_SaveBuffer * sb, size_t delta);
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/*
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* Returns non-zero if write failed.
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* Allocates buffer as needed.
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*/
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int lbsSB_write(
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luabins_SaveBuffer * sb,
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const unsigned char * bytes,
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size_t length
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);
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/*
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* Returns non-zero if write failed.
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* Allocates buffer as needed.
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* Convenience function.
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*/
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int lbsSB_writechar(
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luabins_SaveBuffer * sb,
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unsigned char byte
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);
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#define lbsSB_length(sb) ( (sb)->end )
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/*
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* If offset is greater than total length, data is appended to the end.
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* Returns non-zero if write failed.
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* Allocates buffer as needed.
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*/
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int lbsSB_overwrite(
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luabins_SaveBuffer * sb,
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size_t offset,
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const unsigned char * bytes,
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size_t length
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);
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/*
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* If offset is greater than total length, data is appended to the end.
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* Returns non-zero if write failed.
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* Allocates buffer as needed.
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* Convenience function.
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*/
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int lbsSB_overwritechar(
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luabins_SaveBuffer * sb,
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size_t offset,
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unsigned char byte
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);
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/*
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* Returns a pointer to the internal buffer with data.
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* Note that buffer is NOT zero-terminated.
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* Buffer is valid until next operation with the given sb.
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*/
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const unsigned char * lbsSB_buffer(luabins_SaveBuffer * sb, size_t * length);
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void lbsSB_destroy(luabins_SaveBuffer * sb);
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#endif /* LUABINS_SAVEBUFFER_H_INCLUDED_ */
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