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1 | #ifndef BUFFER_H |
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2 | #define BUFFER_H |
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3 | |
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4 | #include "ucx.h" |
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5 | #include <sys/types.h> |
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6 | #include <stdio.h> |
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7 | |
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8 | #ifdef __cplusplus |
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9 | extern "C" { |
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10 | #endif |
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11 | |
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12 | #define UCX_BUFFER_DEFAULT 0x00 |
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13 | #define UCX_BUFFER_AUTOFREE 0x01 |
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14 | /* the buffer may automatically double its size on write operations */ |
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15 | #define UCX_BUFFER_AUTOEXTEND 0x02 |
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16 | |
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17 | /* the user shall not modify values, but may get the latest pointer */ |
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18 | typedef struct { |
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19 | char *space; |
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20 | size_t pos; |
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21 | size_t capacity; |
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22 | size_t size; |
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23 | int flags; |
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24 | } UcxBuffer; |
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25 | |
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26 | /* if space is NULL, new space is allocated and the autofree flag is enforced */ |
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27 | UcxBuffer *ucx_buffer_new(void *space, size_t size, int flags); |
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28 | void ucx_buffer_free(UcxBuffer* buffer); |
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29 | |
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30 | /* |
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31 | * the autofree flag is enforced for the new buffer |
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32 | * if length is zero, the whole remaining buffer shall be extracted |
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33 | * the position of the new buffer is set to zero |
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34 | */ |
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35 | UcxBuffer* ucx_buffer_extract(UcxBuffer *src, |
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36 | size_t start, size_t length, int flags); |
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37 | #define ucx_buffer_clone(src,flags) \ |
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38 | ucx_buffer_extract(src, 0, 0, flags) |
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39 | |
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40 | /* |
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41 | * Moves the position of the buffer to a new position relative to whence. |
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42 | * |
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43 | * SEEK_SET marks the start of the buffer |
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44 | * SEEK_CUR marks the current position |
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45 | * SEEK_END marks the first 0-byte in the buffer |
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46 | * |
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47 | * ucx_memseek returns 0 on success and -1 if the new position is beyond the |
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48 | * bounds of the allocated buffer. In that case the position of the buffer |
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49 | * remains unchanged. |
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50 | * |
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51 | */ |
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52 | int ucx_buffer_seek(UcxBuffer *buffer, off_t offset, int whence); |
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53 | |
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54 | /* |
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55 | * returns non-zero, if the current buffer position has exceeded the last |
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56 | * available byte of the underlying buffer |
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57 | * |
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58 | */ |
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59 | int ucx_buffer_eof(UcxBuffer *buffer); |
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60 | |
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61 | |
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62 | int ucx_buffere_extend(UcxBuffer *buffer, size_t len); |
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63 | |
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64 | size_t ucx_buffer_write(const void *ptr, size_t size, size_t nitems, |
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65 | UcxBuffer *buffer); |
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66 | |
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67 | size_t ucx_buffer_read(void *ptr, size_t size, size_t nitems, |
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68 | UcxBuffer *buffer); |
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69 | |
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70 | /* when autoextend is enabled, ensure you get the latest pointer to the data */ |
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71 | //define ucx_buffer_write(data, itemsize, nitems, buffer) \ |
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72 | // ucx_bufio(data, itemsize, nitems, buffer, 0) |
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73 | //define ucx_buffer_read(data, itemsize, nitems, buffer) \ |
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74 | // ucx_bufio(data, itemsize, nitems, buffer, 1) |
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75 | int ucx_buffer_putc(UcxBuffer *b, int c); |
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76 | int ucx_buffer_getc(UcxBuffer *b); |
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77 | |
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78 | |
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79 | /* |
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80 | * copies all bytes from s1 to s2 |
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81 | * uses the read function r to read from s1 und writes the data using the |
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82 | * write function w to s2 |
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83 | * returns the number of bytes copied |
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84 | */ |
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85 | size_t ucx_buffer_generic_copy(void *s1, void *s2, read_func r, write_func w, |
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86 | size_t bufsize); |
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87 | |
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88 | |
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89 | #define UCX_DEFAULT_BUFFER_SIZE 0x4000000 |
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90 | |
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91 | #define ucx_buffer_copy(s1,s2,r,w) \ |
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92 | ucx_buffer_generic_copy(s1, s2, (read_func)r, (write_func)w, \ |
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93 | UCX_DEFAULT_BUFFER_SIZE) |
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94 | |
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95 | #ifdef __cplusplus |
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96 | } |
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97 | #endif |
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98 | |
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99 | #endif /* BUFFER_H */ |
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100 |