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/* 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>
typedef struct {
int size; /* In bytes */
int growby; /* Allocation unit in bytes */
int allocated; /* Current size of *data */
char * data; /* Pointer to malloced area or 0 */
int failok; /* allowed to fail without exiting program? */
} HTChunk;
/*
* Initialize a chunk's allocation data and allocation-increment.
*/
extern void HTChunkInit PARAMS((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 PARAMS((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 PARAMS((int growby, int failok));
/*
* Like HTChunkCreate but with initial allocation - kw
*
*/
extern HTChunk * HTChunkCreate2 PARAMS((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 PARAMS((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 PARAMS((HTChunk * ch));
/*
*
* 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 PARAMS((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 PARAMS((HTChunk * ch, char c));
extern void HTChunkPutb PARAMS((HTChunk * ch, CONST char *b, int l));
extern void HTChunkPutUtf8Char PARAMS((HTChunk * ch, UCode_t code));
/*
* Append a string to a chunk
*
* ON ENTRY,
*
* ch A valid chunk pointer made by HTChunkCreate()
*
* str Tpoints to a zero-terminated string to be appended
*
* ON EXIT,
*
* *ch Is bigger by strlen(str)
*
*/
extern void HTChunkPuts PARAMS((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 PARAMS((HTChunk * ch));
#endif /* HTCHUNK_H */
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