[14] | 1 | #include "alutInternal.h" |
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| 2 | #include <stdio.h> |
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| 3 | #include <string.h> |
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| 4 | #include <sys/types.h> |
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| 5 | #include <sys/stat.h> |
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| 6 | |
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| 7 | #if HAVE_STAT |
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| 8 | #if HAVE_UNISTD_H |
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| 9 | #include <unistd.h> |
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| 10 | #endif |
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| 11 | #define structStat struct stat |
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| 12 | #elif HAVE__STAT |
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| 13 | #define stat(p,b) _stat((p),(b)) |
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| 14 | #define structStat struct _stat |
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| 15 | #else |
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| 16 | #error No stat-like function on this platform |
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| 17 | #endif |
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| 18 | |
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| 19 | struct InputStream_struct |
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| 20 | { |
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| 21 | ALboolean isFileStream; |
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| 22 | char *fileName; |
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| 23 | size_t remainingLength; |
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| 24 | union |
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| 25 | { |
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| 26 | FILE *fileDescriptor; /* for file streams */ |
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| 27 | const ALvoid *data; /* for memory streams */ |
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| 28 | } u; |
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| 29 | }; |
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| 30 | |
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| 31 | /**************************************************************************** |
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| 32 | * The functions below know the internal InputStream representation. |
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| 33 | ****************************************************************************/ |
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| 34 | |
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| 35 | InputStream * |
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| 36 | _alutInputStreamConstructFromFile (const char *fileName) |
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| 37 | { |
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| 38 | InputStream *stream; |
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| 39 | structStat statBuf; |
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| 40 | FILE *fileDescriptor; |
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| 41 | char *fileNameBuffer; |
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| 42 | |
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| 43 | stream = (InputStream *) _alutMalloc (sizeof (InputStream)); |
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| 44 | if (stream == NULL) |
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| 45 | { |
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| 46 | return NULL; |
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| 47 | } |
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| 48 | |
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| 49 | if (stat (fileName, &statBuf)) |
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| 50 | { |
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| 51 | _alutSetError (ALUT_ERROR_IO_ERROR); |
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| 52 | free (stream); |
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| 53 | return NULL; |
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| 54 | } |
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| 55 | |
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| 56 | fileDescriptor = fopen (fileName, "rb"); |
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| 57 | if (fileDescriptor == NULL) |
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| 58 | { |
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| 59 | _alutSetError (ALUT_ERROR_IO_ERROR); |
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| 60 | free (stream); |
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| 61 | return NULL; |
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| 62 | } |
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| 63 | |
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| 64 | fileNameBuffer = (char *) _alutMalloc (strlen (fileName) + 1); |
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| 65 | if (fileNameBuffer == NULL) |
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| 66 | { |
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| 67 | free (stream); |
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| 68 | return NULL; |
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| 69 | } |
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| 70 | |
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| 71 | stream->isFileStream = AL_TRUE; |
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| 72 | stream->fileName = strcpy (fileNameBuffer, fileName); |
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| 73 | stream->remainingLength = statBuf.st_size; |
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| 74 | stream->u.fileDescriptor = fileDescriptor; |
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| 75 | return stream; |
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| 76 | } |
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| 77 | |
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| 78 | InputStream * |
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| 79 | _alutInputStreamConstructFromMemory (const ALvoid *data, size_t length) |
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| 80 | { |
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| 81 | InputStream *stream = (InputStream *) _alutMalloc (sizeof (InputStream)); |
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| 82 | if (stream == NULL) |
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| 83 | { |
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| 84 | return NULL; |
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| 85 | } |
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| 86 | |
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| 87 | stream->isFileStream = AL_FALSE; |
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| 88 | stream->fileName = NULL; |
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| 89 | stream->remainingLength = length; |
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| 90 | stream->u.data = data; |
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| 91 | return stream; |
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| 92 | } |
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| 93 | |
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| 94 | ALboolean |
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| 95 | _alutInputStreamDestroy (InputStream *stream) |
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| 96 | { |
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| 97 | ALboolean status = |
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| 98 | (stream->isFileStream && fclose (stream->u.fileDescriptor)) ? |
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| 99 | AL_FALSE : AL_TRUE; |
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| 100 | if (stream->fileName) |
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| 101 | { |
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| 102 | free (stream->fileName); |
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| 103 | } |
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| 104 | free (stream); |
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| 105 | return status; |
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| 106 | } |
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| 107 | |
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| 108 | const char * |
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| 109 | _alutInputStreamGetFileName (const InputStream *stream) |
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| 110 | { |
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| 111 | return stream->fileName; |
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| 112 | } |
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| 113 | |
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| 114 | size_t |
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| 115 | _alutInputStreamGetRemainingLength (const InputStream *stream) |
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| 116 | { |
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| 117 | return stream->remainingLength; |
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| 118 | } |
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| 119 | |
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| 120 | ALboolean |
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| 121 | _alutInputStreamEOF (InputStream *stream) |
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| 122 | { |
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| 123 | if (stream->isFileStream) |
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| 124 | { |
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| 125 | int c = fgetc (stream->u.fileDescriptor); |
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| 126 | if (c != EOF) |
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| 127 | { |
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| 128 | ungetc (c, stream->u.fileDescriptor); |
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| 129 | } |
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| 130 | return (c == EOF) ? AL_TRUE : AL_FALSE; |
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| 131 | } |
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| 132 | else |
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| 133 | { |
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| 134 | return (stream->remainingLength == 0) ? AL_TRUE : AL_FALSE; |
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| 135 | } |
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| 136 | } |
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| 137 | |
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| 138 | static ALboolean |
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| 139 | streamRead (InputStream *stream, void *ptr, size_t numBytesToRead) |
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| 140 | { |
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| 141 | if (stream->isFileStream) |
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| 142 | { |
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| 143 | size_t numBytesRead = |
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| 144 | fread (ptr, 1, numBytesToRead, stream->u.fileDescriptor); |
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| 145 | if (numBytesToRead != numBytesRead) |
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| 146 | { |
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| 147 | _alutSetError (ferror (stream->u.fileDescriptor) ? |
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| 148 | ALUT_ERROR_IO_ERROR : |
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| 149 | ALUT_ERROR_CORRUPT_OR_TRUNCATED_DATA); |
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| 150 | return AL_FALSE; |
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| 151 | } |
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| 152 | return AL_TRUE; |
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| 153 | } |
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| 154 | else |
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| 155 | { |
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| 156 | if (stream->remainingLength < numBytesToRead) |
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| 157 | { |
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| 158 | _alutSetError (ALUT_ERROR_CORRUPT_OR_TRUNCATED_DATA); |
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| 159 | return AL_FALSE; |
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| 160 | } |
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| 161 | memcpy (ptr, stream->u.data, numBytesToRead); |
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| 162 | stream->u.data = ((const char *) (stream->u.data) + numBytesToRead); |
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| 163 | return AL_TRUE; |
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| 164 | } |
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| 165 | } |
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| 166 | |
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| 167 | /**************************************************************************** |
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| 168 | * The utility functions below do not know the internal InputStream |
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| 169 | * representation. |
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| 170 | ****************************************************************************/ |
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| 171 | |
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| 172 | ALvoid * |
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| 173 | _alutInputStreamRead (InputStream *stream, size_t length) |
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| 174 | { |
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| 175 | ALvoid *data = _alutMalloc (length); |
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| 176 | if (data == NULL) |
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| 177 | { |
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| 178 | return NULL; |
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| 179 | } |
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| 180 | |
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| 181 | if (!streamRead (stream, data, length)) |
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| 182 | { |
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| 183 | free (data); |
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| 184 | return NULL; |
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| 185 | } |
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| 186 | |
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| 187 | return data; |
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| 188 | } |
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| 189 | |
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| 190 | ALboolean |
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| 191 | _alutInputStreamSkip (InputStream *stream, size_t numBytesToSkip) |
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| 192 | { |
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| 193 | ALboolean status; |
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| 194 | char *buf; |
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| 195 | if (numBytesToSkip == 0) |
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| 196 | { |
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| 197 | return AL_TRUE; |
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| 198 | } |
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| 199 | buf = (char *) _alutMalloc (numBytesToSkip); |
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| 200 | if (buf == NULL) |
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| 201 | { |
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| 202 | return AL_FALSE; |
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| 203 | } |
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| 204 | status = streamRead (stream, buf, numBytesToSkip); |
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| 205 | free (buf); |
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| 206 | return status; |
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| 207 | } |
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| 208 | |
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| 209 | ALboolean |
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| 210 | _alutInputStreamReadUInt16LE (InputStream *stream, UInt16LittleEndian *value) |
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| 211 | { |
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| 212 | unsigned char buf[2]; |
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| 213 | if (!streamRead (stream, buf, sizeof (buf))) |
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| 214 | { |
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| 215 | return AL_FALSE; |
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| 216 | } |
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| 217 | *value = ((UInt16LittleEndian) buf[1] << 8) | ((UInt16LittleEndian) buf[0]); |
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| 218 | return AL_TRUE; |
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| 219 | } |
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| 220 | |
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| 221 | ALboolean |
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| 222 | _alutInputStreamReadInt32BE (InputStream *stream, Int32BigEndian *value) |
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| 223 | { |
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| 224 | unsigned char buf[4]; |
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| 225 | if (!streamRead (stream, buf, sizeof (buf))) |
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| 226 | { |
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| 227 | return AL_FALSE; |
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| 228 | } |
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| 229 | *value = |
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| 230 | ((Int32BigEndian) buf[0] << 24) | |
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| 231 | ((Int32BigEndian) buf[1] << 16) | |
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| 232 | ((Int32BigEndian) buf[2] << 8) | ((Int32BigEndian) buf[3]); |
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| 233 | return AL_TRUE; |
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| 234 | } |
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| 235 | |
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| 236 | ALboolean |
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| 237 | _alutInputStreamReadUInt32LE (InputStream *stream, UInt32LittleEndian *value) |
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| 238 | { |
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| 239 | unsigned char buf[4]; |
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| 240 | if (!streamRead (stream, buf, sizeof (buf))) |
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| 241 | { |
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| 242 | return AL_FALSE; |
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| 243 | } |
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| 244 | *value = |
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| 245 | ((UInt32LittleEndian) buf[3] << 24) | |
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| 246 | ((UInt32LittleEndian) buf[2] << 16) | |
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| 247 | ((UInt32LittleEndian) buf[1] << 8) | ((UInt32LittleEndian) buf[0]); |
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| 248 | return AL_TRUE; |
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| 249 | } |
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