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/*
* $LynxId: HTChunk.h,v 1.20 2010/09/24 08:37:39 tom Exp $
*
* HTChunk: Flexible array handling for libwww
* CHUNK HANDLING:
* FLEXIBLE ARRAYS
*
* This module implements a flexible array. It is a general utility module. A
* chunk is a structure which may be extended. These routines create and
* append data to chunks, automatically reallocating them as necessary.
*
*/
#ifndef HTCHUNK_H
#define HTCHUNK_H 1
#ifndef HTUTILS_H
#include <HTUtils.h>
#endif
#include <UCMap.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct _HTChunk HTChunk;
struct _HTChunk {
int size; /* In bytes */
int growby; /* Allocation unit in bytes */
int allocated; /* Current size of *data */
char *data; /* Pointer to malloc'd area or 0 */
int failok; /* allowed to fail without exiting program? */
HTChunk *next; /* pointer to the next chunk */
};
/*
* Initialize a chunk's allocation data and allocation-increment.
*/
extern void HTChunkInit(HTChunk *ch, int grow);
/*
*
* Create new chunk
*
* ON ENTRY,
*
* growby The number of bytes to allocate at a time when the chunk
* is later extended. Arbitrary but normally a trade-off
* of time vs memory.
*
* ON EXIT,
*
* returns A chunk pointer to the new chunk,
*
*/
extern HTChunk *HTChunkCreate(int growby);
/*
* Create a chunk for which an allocation error is not a fatal application
* error if failok != 0, but merely resets the chunk. When using a chunk
* created this way, the caller should always check whether the contents
* are ok each time after data have been appended.
* The create call may also fail and will reurn NULL in that case. - kw
*/
extern HTChunk *HTChunkCreateMayFail(int growby, int failok);
/*
* Like HTChunkCreate but with initial allocation - kw
*
*/
extern HTChunk *HTChunkCreate2(int growby, size_t needed);
/*
*
* Free a chunk
*
* ON ENTRY,
*
* ch A valid chunk pointer made by HTChunkCreate()
*
* ON EXIT,
*
* ch is invalid and may not be used.
*
*/
extern void HTChunkFree(HTChunk *ch);
/*
*
* Clear a chunk
*
* ON ENTRY,
*
* ch A valid chunk pointer made by HTChunkCreate()
*
* ON EXIT,
*
* *ch The size of the chunk is zero.
*
*/
extern void HTChunkClear(HTChunk *ch);
/*
*
* Realloc a chunk
*
* ON ENTRY,
*
* ch A valid chunk pointer made by HTChunkCreate()
*
* growby growby
*
* ON EXIT,
*
* *ch Expanded by growby
*
*/
extern BOOL HTChunkRealloc(HTChunk *ch, int growby);
/*
*
* Ensure a chunk has a certain space in
*
* ON ENTRY,
*
* ch A valid chunk pointer made by HTChunkCreate()
*
* s The size required
*
* ON EXIT,
*
* *ch Has size at least s
*
*/
extern void HTChunkEnsure(HTChunk *ch, int s);
/*
*
* Append a character to a chunk
*
* ON ENTRY,
*
* ch A valid chunk pointer made by HTChunkCreate()
*
* c The character to be appended
*
* ON EXIT,
*
* *ch Is one character bigger
*
*/
extern void HTChunkPutc(HTChunk *ch, unsigned c);
extern void HTChunkPutb(HTChunk *ch, const char *b, int l);
extern void HTChunkPutUtf8Char(HTChunk *ch, UCode_t code);
/*
* Append a string to a chunk
*
* ON ENTRY,
*
* ch A valid chunk pointer made by HTChunkCreate()
*
* str Points to a zero-terminated string to be appended
*
* ON EXIT,
*
* *ch Is bigger by strlen(str)
*
*/
extern void HTChunkPuts(HTChunk *ch, const char *str);
/*
*
* Append a zero character to a chunk
*
*/
/*
*
* ON ENTRY,
*
* ch A valid chunk pointer made by HTChunkCreate()
*
* ON EXIT,
*
* *ch Is one character bigger
*
*/
extern void HTChunkTerminate(HTChunk *ch);
/* like the above but no realloc: extend to another chunk if necessary */
/*
*
* Append a character (string, data) to a chunk
*
* ON ENTRY,
*
* ch A valid chunk pointer made by HTChunkCreate()
*
* c The character to be appended
*
* ON EXIT,
*
* returns original chunk or a pointer to the new chunk
* (orginal chunk is referenced to the new one
* by the field 'next')
*
*/
extern HTChunk *HTChunkPutc2(HTChunk *ch, int c);
extern HTChunk *HTChunkPuts2(HTChunk *ch, const char *str);
extern HTChunk *HTChunkPutb2(HTChunk *ch, const char *b, int l);
/* New pool infrastructure: UNlike the above, store data using alignment */
extern HTChunk *HTChunkPutb0(HTChunk *ch, const char *b, int l);
#ifdef __cplusplus
}
#endif
#endif /* HTCHUNK_H */
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