The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1 | /* Copyright (C) 2007-2008 The Android Open Source Project |
| 2 | ** |
| 3 | ** This software is licensed under the terms of the GNU General Public |
| 4 | ** License version 2, as published by the Free Software Foundation, and |
| 5 | ** may be copied, distributed, and modified under those terms. |
| 6 | ** |
| 7 | ** This program is distributed in the hope that it will be useful, |
| 8 | ** but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | ** GNU General Public License for more details. |
| 11 | */ |
| 12 | #include "cbuffer.h" |
| 13 | #include "android/utils/stralloc.h" |
| 14 | #include <string.h> |
| 15 | #include <stdlib.h> |
| 16 | #include <assert.h> |
| 17 | #include <stdio.h> |
| 18 | |
| 19 | #define DEBUG 0 |
| 20 | |
| 21 | #if DEBUG |
| 22 | # define ASSERT(cond,fmt,...) ({ if (!(cond)) { fprintf(stderr, fmt, __VA_ARGS__); assert(cond); } }) |
| 23 | #else |
| 24 | # define ASSERT(cond,fmt,...) ((void)0) |
| 25 | #endif |
| 26 | |
| 27 | #if DEBUG |
| 28 | void |
| 29 | cbuffer_assert( CBuffer* cb, const char* file, long lineno ) |
| 30 | { |
| 31 | const char* reason = NULL; |
| 32 | |
| 33 | if (cb->rpos < 0 || cb->rpos >= cb->size) { |
| 34 | reason = "rpos is out of bounds"; |
| 35 | } |
| 36 | else if (cb->count < 0 || cb->count > cb->size) { |
| 37 | reason = "count is incorrect"; |
| 38 | } |
| 39 | if (!reason) |
| 40 | return; |
| 41 | |
| 42 | fprintf(stderr, "assert:%s:%ld: assertion failed: %s (pos=%d count=%d size=%d)\n", |
| 43 | file, lineno, reason, cb->rpos, cb->count, cb->size); |
| 44 | assert(0); |
| 45 | } |
| 46 | # define CBUFFER_ASSERT(cb) cbuffer_assert(cb,__FUNCTION__,__LINE__) |
| 47 | #else |
| 48 | # define CBUFFER_ASSERT(cb) ((void)0) |
| 49 | #endif |
| 50 | |
| 51 | int |
| 52 | cbuffer_write_peek( CBuffer* cb, uint8_t* *pbase ) |
| 53 | { |
| 54 | int wpos = cb->rpos + cb->count; |
| 55 | int avail = cb->size - cb->count; |
| 56 | |
| 57 | CBUFFER_ASSERT(cb); |
| 58 | |
| 59 | if (wpos >= cb->size) |
| 60 | wpos -= cb->size; |
| 61 | |
| 62 | if (wpos + avail > cb->size) |
| 63 | avail = cb->size - wpos; |
| 64 | |
| 65 | *pbase = cb->buff + wpos; |
| 66 | return avail; |
| 67 | } |
| 68 | |
| 69 | void |
| 70 | cbuffer_write_step( CBuffer* cb, int len ) |
| 71 | { |
| 72 | CBUFFER_ASSERT(cb); |
| 73 | |
| 74 | cb->count += len; |
| 75 | if (cb->count > cb->size) |
| 76 | cb->count = cb->size; |
| 77 | } |
| 78 | |
| 79 | |
| 80 | int |
| 81 | cbuffer_write( CBuffer* cb, const void* from, int len ) |
| 82 | { |
| 83 | int len2 = len; |
| 84 | |
| 85 | CBUFFER_ASSERT(cb); |
| 86 | |
| 87 | while (len2 > 0) { |
| 88 | int avail = cb->size - cb->count; |
| 89 | int wpos = cb->rpos + cb->count; |
| 90 | |
| 91 | ASSERT(avail >= 0, "avail is negative: %d", avail); |
| 92 | |
| 93 | if (avail == 0) |
| 94 | break; |
| 95 | |
| 96 | if (wpos >= cb->size) |
| 97 | wpos -= cb->size; |
| 98 | |
| 99 | ASSERT( wpos >= 0 && wpos < cb->size, "wpos is out-of-bounds: %d (rpos=%d)", wpos, cb->rpos); |
| 100 | |
| 101 | if (wpos + avail > cb->size) |
| 102 | avail = cb->size - wpos; |
| 103 | |
| 104 | if (avail > len2) |
| 105 | avail = len2; |
| 106 | |
| 107 | memcpy( cb->buff + wpos, (const char*)from, avail ); |
| 108 | |
| 109 | from = (char*)from + avail; |
| 110 | len2 -= avail; |
| 111 | cb->count += avail; |
| 112 | } |
| 113 | return len - len2; |
| 114 | } |
| 115 | |
| 116 | int |
| 117 | cbuffer_read( CBuffer* cb, void* to, int len ) |
| 118 | { |
| 119 | int len2 = len; |
| 120 | |
| 121 | CBUFFER_ASSERT(cb); |
| 122 | |
| 123 | while (len2 > 0) { |
| 124 | int avail = cb->count; |
| 125 | int rpos = cb->rpos; |
| 126 | |
| 127 | ASSERT(avail >= 0, "avail is negative: %d", avail); |
| 128 | |
| 129 | if (avail == 0) |
| 130 | break; |
| 131 | |
| 132 | ASSERT((rpos >= 0 && rpos < cb->size), "rpos is out-of-bounds: %d", rpos); |
| 133 | |
| 134 | if (rpos+avail > cb->size) |
| 135 | avail = cb->size - rpos; |
| 136 | |
| 137 | if (avail > len2) |
| 138 | avail = len2; |
| 139 | |
| 140 | memcpy( (char*)to, (const char*)cb->buff + rpos, avail ); |
| 141 | to = (char*)to + avail; |
| 142 | len2 -= avail; |
| 143 | cb->count -= avail; |
| 144 | cb->rpos += avail; |
| 145 | if (cb->rpos >= cb->size) |
| 146 | cb->rpos -= cb->size; |
| 147 | } |
| 148 | return len - len2; |
| 149 | } |
| 150 | |
| 151 | int |
| 152 | cbuffer_read_peek( CBuffer* cb, uint8_t* *pbase ) |
| 153 | { |
| 154 | int rpos = cb->rpos; |
| 155 | int avail = cb->count; |
| 156 | |
| 157 | CBUFFER_ASSERT(cb); |
| 158 | |
| 159 | if (rpos + avail > cb->size) |
| 160 | avail = cb->size - rpos; |
| 161 | |
| 162 | *pbase = cb->buff + rpos; |
| 163 | return avail; |
| 164 | } |
| 165 | |
| 166 | |
| 167 | void |
| 168 | cbuffer_read_step( CBuffer* cb, int len ) |
| 169 | { |
| 170 | CBUFFER_ASSERT(cb); |
| 171 | |
| 172 | if (len > cb->count) |
| 173 | len = cb->count; |
| 174 | |
| 175 | cb->rpos += len; |
| 176 | if (cb->rpos >= cb->size) |
| 177 | cb->rpos -= cb->size; |
| 178 | |
| 179 | cb->count -= len; |
| 180 | } |
| 181 | |
| 182 | const char* |
| 183 | cbuffer_quote( CBuffer* cb ) |
| 184 | { |
| 185 | STRALLOC_DEFINE(s); |
| 186 | char* q; |
| 187 | |
| 188 | stralloc_format( s, "cbuffer %p (pos=%d count=%d size=%d)", |
| 189 | cb, cb->rpos, cb->count, cb->size ); |
| 190 | |
| 191 | q = stralloc_to_tempstr( s ); |
| 192 | stralloc_reset(s); |
| 193 | |
| 194 | return q; |
| 195 | } |
| 196 | |
| 197 | const char* |
| 198 | cbuffer_quote_data( CBuffer* cb ) |
| 199 | { |
| 200 | STRALLOC_DEFINE(s); |
| 201 | int len = cb->count; |
| 202 | int rpos = cb->rpos; |
| 203 | char* result; |
| 204 | |
| 205 | while (len > 0) { |
| 206 | int avail = len; |
| 207 | |
| 208 | if (rpos >= cb->size) |
| 209 | rpos -= cb->size; |
| 210 | |
| 211 | if (rpos + avail > cb->size) |
| 212 | avail = cb->size - rpos; |
| 213 | |
| 214 | stralloc_add_quote_bytes( s, cb->buff + rpos, avail ); |
| 215 | rpos += avail; |
| 216 | len -= avail; |
| 217 | } |
| 218 | |
| 219 | result = stralloc_to_tempstr(s); |
| 220 | stralloc_reset(s); |
| 221 | |
| 222 | return result; |
| 223 | } |
| 224 | |
| 225 | void |
| 226 | cbuffer_print( CBuffer* cb ) |
| 227 | { |
| 228 | /* print the content of a cbuffer */ |
| 229 | printf( "%s: %s", cbuffer_quote(cb), cbuffer_quote_data(cb) ); |
| 230 | } |
| 231 | |